T4 Request to Classify 2004-2008 Acura TSX in T4
#33590 from William Phee · Rule change · TB 23-04 (2023-04 Fastrack)
In T4 Spec lines, classify Acura TSX (2004-2008) as follows:
A specification table follows in the original; it is not shown here.
BoP Lab / Michelin Raceway Road Atlanta
AS + SRF + T4 + FP at Michelin Raceway Road Atlanta
SRF has no laps in the events chosen. It ran at U.S. 2016: add that event.
Official results win over the timing feed: the live timing recorded a 1:38.568 for Mason Workman in Super Tour Mar 2023 Grp 6 EP,FP,Hp,GTL Race 1, but the official results credit 1:41.850 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:39.671 for Perry Simonds in Super Tour Mar 2023 Grp 6 EP,FP,Hp,GTL Race 1, but the official results credit 1:42.681 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:44.473 for Mark Weber in Super Tour Mar 2023 Grp 6 EP,FP,Hp,GTL Race 1, but the official results credit 1:58.872 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:52.000 for Gregg Seigart in Super Tour Mar 2023 Grp 6 EP,FP,Hp,GTL Race 1, but the official results credit 1:59.629 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:40.456 for Marc Cefalo in Super Tour Mar 2023 Grp 8 B-Spec,T3,T4 Race1, but the official results credit 1:45.532 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:40.526 for Robert Spence in Super Tour Mar 2023 Grp 8 B-Spec,T3,T4 Race1, but the official results credit 1:49.905 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:41.411 for Angelica Sprehe in Super Tour Mar 2023 Grp 8 B-Spec,T3,T4 Race1, but the official results credit 1:49.608 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:41.453 for Charles Habisreutinger in Super Tour Mar 2023 Grp 8 B-Spec,T3,T4 Race1, but the official results credit 1:45.252 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:42.345 for Robert Spence in Super Tour Mar 2025 Grp 4 STL STU GT3U T3 T4 Race 1, but the official results credit 1:42.446 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:39.332 for Stephen Simonds in Super Tour Mar 2025 Grp 6 EP FP HP B-Spec Race 1, but the official results credit 1:40.560 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:41.676 for Mark Weber in Super Tour Mar 2025 Grp 6 EP FP HP B-Spec Race 1, but the official results credit 1:42.215 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:41.326 for Kevin Fryer in Super Tour Mar 2026 Grp 4 STL STU T3 T4 Race 1, but the official results credit 1:53.758 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:40.736 for Ayden Rose in Super Tour Mar 2026 Grp 4 STL STU T3 T4 Race 1, but the official results credit 1:53.918 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:42.800 for Robert Spence in Super Tour Mar 2026 Grp 4 STL STU T3 T4 Race 1, but the official results credit 1:54.700 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:39.600 for Ken Kannard in Super Tour Mar 2026 Grp 5 EP FP HP B-Spec Race 1, but the official results credit 1:48.771 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:39.386 for Cliff Ira in Super Tour Mar 2026 Grp 5 EP FP HP B-Spec Race 1, but the official results credit 1:48.427 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:41.177 for Steven Powers in Super Tour Mar 2026 Grp 5 EP FP HP B-Spec Race 1, but the official results credit 1:48.283 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too; the live timing recorded a 1:42.165 for Robert Garrison in Super Tour Mar 2026 Grp 5 EP FP HP B-Spec Race 1, but the official results credit 1:47.908 as the car's fastest, so the timing system did not count that lap (usually a lap under a full-course yellow or a timing-loop fault); it is left out here too.
| Pos | Car | Driver | Class | # | Lap | Theoretical | Qual | Race | 5-lap stint | Consistency | Trap | S1 | S2 | S3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Ford Mustang | Michael Kamalian | AS | 199, 99 | 1:34.642 A-R1 | 1:34.569 | 1:36.558 B-Q1 | 1:34.642 A-R1 | 1:36.577 A-R1 | +7.895 A-R1 | 140.9 A-R1 | 37.067 A-R1 | 33.474 A-R1 | 24.028 A-R1 |
| 2 | Ford Mustang (2003) | Thomas J Ellis | AS | 51 | 1:35.351 B-R2 | 1:34.701 | 1:35.467 B-Q2 | 1:35.351 B-R2 | 1:36.206 B-R2 | +1.450 B-R2 | 138.3 B-R2 | 37.678 B-R2 | 32.639 B-Q2 | 24.384 B-R2 |
| 3 | Ford Mustang (2006) | Gregory Eaton | AS | 21 | 1:35.692 B-R2 | 1:35.295 | 1:36.767 B-Q2 | 1:35.692 B-R2 | 1:36.001 B-R2 | +0.932 B-R2 | 132.5 B-R2 | 37.336 B-R2 | 33.408 B-Q2 | 24.551 B-R2 |
| 4 | Ford Mustang GT (2008) | James Jost | AS | 14 | 1:36.389 B-R2 | 1:35.532 | 1:38.195 B-Q2 | 1:36.389 B-R2 | 1:37.112 B-R2 | +1.514 B-R2 | 138.6 B-Q1 | 38.069 B-R1 | 32.794 B-R2 | 24.669 B-R2 |
| 5 | Acura Integra | Ken Kannard | FP | 51 | 1:37.623 C-R2 | sector data unreliable | 1:37.924 C-Q2 | 1:37.623 C-R2 | 1:38.167 C-R2 | +1.332 C-R2 | 122.9 A-Q1 | 37.585 | 0.792 | 24.740 |
| 6 | Mazda Miata (1992) | Mason Workman | FP | 52 | 1:38.226 B-Q2 | 1:37.974 | 1:38.226 B-Q2 | 1:38.805 C-R2 | 1:39.090 C-R2 | +2.802 C-R2 | 120.2 D-Q2 | 37.238 C-Q2 | 35.576 D-Q2 | 25.160 D-Q2 |
| 7 | Honda CRX (1988) | Chris Bovis | FP | 178 | 1:38.576 B-Q1 | 1:38.061 | 1:38.576 B-Q1 | 1:38.655 B-R2 | 1:40.253 B-R1 | +1.209 B-R1 | 117.3 B-R2 | 37.788 B-Q2 | 35.332 B-R2 | 24.941 B-Q1 |
| 8 | Mazda Miata | Jonathan Neudorf | T4 | 95 | 1:38.841 D-Q2 | 1:38.683 | 1:38.841 D-Q2 | 1:40.761 D-R1 | 1:42.906 D-R1 | +3.413 D-R1 | 118.1 D-R1 | 37.070 D-Q2 | 36.372 D-Q2 | 25.241 D-Q2 |
| 9 | BMW 325es | Matt Reppert | FP | 88 | 1:38.885 D-Q2 | 1:38.656 | 1:38.885 D-Q2 | 1:38.946 D-R1 | 1:39.189 D-R1 | +0.711 D-R1 | 122.1 D-R1 | 37.730 D-R1 | 35.717 D-R1 | 25.209 D-Q2 |
| 10 | Mazda mx5 (2009) | Marc Cefalo 2+ cars | T4 | 00 | 1:39.119 D-Q2 | 1:38.943 | 1:39.119 D-Q2 | 1:41.160 C-R2 | 1:46.547 D-R2 | +1.403 D-R2 | 118.3 D-Q2 | 37.431 D-Q2 | 36.328 C-R2 | 25.184 D-Q2 |
| 11 | Honda Civic Del Sol VTEC | Cliff Ira | FP | 36 | 1:39.502 A-Q1 | 1:38.814 | 1:39.502 A-Q1 | 1:48.427 A-R2 | 1:48.964 A-R2 | +6.135 A-R2 | 123.3 A-Q1 | 38.104 A-Q1 | 35.234 A-Q1 | 25.476 A-Q1 |
| 12 | Mazda RX-8 (2004) | Marc Cefalo 2+ cars | T4 | 00 | 1:39.654 B-R2 | 1:39.420 | 1:40.096 B-Q2 | 1:39.654 B-R2 | 1:40.184 B-R2 | +0.831 B-R2 | 111.1 B-R2 | 37.643 B-R2 | 36.384 B-R2 | 25.393 B-R2 |
| 13 | Mazda MIATA MX5 (2006) | Ethan Barker | T4 | 112 | 1:39.976 B-Q2 | 1:39.456 | 1:39.976 B-Q2 | 1:40.155 B-R2 | 1:40.753 B-R2 | +0.624 B-R2 | 108.6 B-R2 | 37.465 B-R2 | 36.492 B-R2 | 25.499 B-Q2 |
| 14 | Mazda MX-5 | Robert Spence | T4 | 59 | 1:40.079 D-Q2 | sector data unreliable | 1:40.079 D-Q2 | 1:42.446 B-R2 | 1:42.920 B-R2 | +0.979 B-R2 | 118.1 D-Q2 | 37.808 | 0.759 | 25.453 |
| 15 | Mazda MIata | Steven Powers | FP | 145 | 1:40.329 A-Q2 | 1:40.226 | 1:40.329 A-Q2 | 1:48.283 A-R2 | 1:49.211 A-R2 | +3.905 A-R2 | 118.4 A-Q2 | 38.142 A-Q2 | 36.400 A-Q2 | 25.684 A-Q2 |
| 16 | Subaru BRZ | Angelica Sprehe 2+ cars | T4 | 120 | 1:40.432 D-Q2 | 1:40.136 | 1:40.432 D-Q2 | 1:49.609 D-R2 | 1:50.144 D-R2 | +1.436 D-R2 | 123.5 D-Q2 | 38.721 D-Q2 | 35.608 D-Q2 | 25.807 D-Q2 |
| 17 | Mazda Miata (1990) | Stephen Simonds | FP | 63 | 1:40.560 B-R2 | sector data unreliable | 1:40.686 B-Q2 | 1:40.560 B-R2 | 1:40.971 B-R2 | +1.297 B-R2 | 113.4 B-R2 | 38.314 | 0.778 | 25.592 |
| 18 | Mazda Miata | Charles Habisreutinger | T4 | 9 | 1:40.594 D-Q2 | 1:40.594 | 1:40.594 D-Q2 | 1:45.252 D-R2 | 1:45.786 D-R2 | +2.364 D-R2 | 116.8 D-R1 | 37.878 D-Q2 | 36.779 D-Q2 | 25.937 D-Q2 |
| 19 | Mazda MX-5 | Kevin Fryer | T4 | 98 | 1:40.673 A-Q2 | 1:40.032 | 1:40.673 A-Q2 | 1:41.079 C-R2 | 2:01.120 C-R2 | +27.245 C-R2 | 117.7 A-Q1 | 37.704 C-Q2 | 36.534 C-R2 | 25.794 A-Q2 |
| 20 | Mazda Miata (1992) | Peter Tonelli II | FP | 91 | 1:41.072 C-R2 | 1:40.896 | 1:41.593 C-Q2 | 1:41.072 C-R2 | 1:42.201 C-R2 | +2.934 C-R2 | 106.7 C-R2 | 38.226 C-Q2 | 36.798 C-R2 | 25.872 C-R2 |
| 21 | Ford Mustang (2012) | Scotty B White | T4 | 0 | 1:41.239 B-R2 | sector data unreliable | 1:41.847 B-Q2 | 1:41.239 B-R2 | 1:41.926 B-R2 | +0.964 B-R2 | 113.1 B-P | 38.735 | 0.916 | 25.791 |
| 22 | Toyota GR86 | Angelica Sprehe 2+ cars | T4 | 120 | 1:41.397 C-Q1 | 1:41.389 | 1:41.397 C-Q1 | 1:42.072 A-R1 | 1:43.692 A-R1 | +4.048 A-R1 | 121.0 A-Q1 | 39.312 A-P | 36.256 C-Q1 | 25.821 C-Q1 |
| 23 | Mazda MX5 (2010) | Richard Mooney | T4 | 9 | 1:41.555 C-Q1 | 1:41.555 | 1:41.555 C-Q1 | 1:44.097 C-R2 | 2:01.549 C-R2 | +11.105 C-R2 | 109.7 C-R2 | 38.698 C-Q1 | 36.901 C-Q1 | 25.956 C-Q1 |
| 24 | Mazda Miata | Robert Garrison | FP | 06 | 1:41.644 A-Q1 | 1:41.563 | 1:41.644 A-Q1 | 1:47.908 A-R2 | 1:49.665 A-R2 | +5.548 A-R2 | 119.0 A-R2 | 38.892 A-Q1 | 36.536 A-Q1 | 26.135 A-Q1 |
| 25 | Mazda Miata | Perry Simonds | FP | 164 | 1:41.729 D-Q1 | 1:41.729 | 1:41.729 D-Q1 | 1:42.681 D-R2 | 1:44.666 D-R2 | +5.022 D-R2 | 120.2 D-Q1 | 40.087 D-R2 | 36.374 D-Q1 | 25.814 D-Q1 |
| 26 | Mazda NC | Ayden Rose | T4 | 46 | 1:41.779 A-Q2 | 1:41.615 | 1:41.779 A-Q2 | 1:53.918 A-R2 | 2:39.310 A-R2 | +10.959 A-R2 | 114.8 A-Q1, A-R2 | 38.819 A-Q2 | 37.079 A-Q1 | 25.717 A-Q1 |
| 27 | Mazda Miata - FP (1993) | Mark Weber | FP | 25 | 1:41.786 B-Q2 | 1:41.472 | 1:41.786 B-Q2 | 1:42.215 B-R2 | 1:42.904 B-R2 | +2.047 B-R2 | 122.4 D-Q2 | 39.042 B-Q2 | 36.275 B-Q2 | 26.155 B-Q2 |
| 28 | Mazda MX5 (2009) | Sergio Zlobin | T4 | 118 | 1:41.856 C-R2 | 1:41.203 | 1:42.326 C-Q1 | 1:41.856 C-R2 | 2:01.035 C-R2 | +15.782 C-R2 | 111.5 C-R2 | 38.506 C-R2 | 36.956 C-R2 | 25.741 C-R2 |
| 29 | Ford Mustang (2010) | Paolo Salvatore | T4 | 142 | 1:41.957 C-Q1 | 1:41.618 | 1:41.957 C-Q1 | 1:45.711 C-R2 | 2:02.053 C-R2 | +10.447 C-R2 | 112.0 C-Q1 | 38.728 C-Q2 | 37.005 C-Q1 | 25.885 C-Q1 |
| 30 | Acura Integra | Les Chaney | FP | 33 | 1:43.861 D-R1 | 1:43.716 | 1:46.823 D-Q2 | 1:43.861 D-R1 | 1:44.600 D-R1 | +2.050 D-R1 | 121.7 D-Q2, D-R1 | 40.568 D-R1 | 36.332 D-R1 | 26.816 D-R1 |
| 31 | Chevrolet Camaro Z-28 (2002) | Phillip Waters | AS | 177 | 1:44.301 C-Q1 | 1:44.301 | 1:44.301 C-Q1 | 2:00.265 C-R1 | 2:08.610 C-R1 | +11.503 C-R1 | 130.0 C-Q1 | 42.124 C-Q1 | 35.315 C-Q1 | 26.862 C-Q1 |
| 32 | Mazda 3S | Leann Falk | T4 | 29 | 1:47.885 A-Q1 | 1:47.593 | 1:47.885 A-Q1 | 1:49.327 A-R1 | 1:52.043 A-R1 | +11.758 A-R1 | 110.9 A-Q1 | 41.580 A-Q1 | 38.358 A-Q1 | 27.655 A-Q1 |
| 33 | Scion FR-S | Jennifer Roames | T4 | 186 | 1:48.835 D-Q1 | 1:47.483 | 1:48.835 D-Q1 | 113.0 D-Q2 | 41.553 D-Q2 | 38.692 D-Q1 | 27.238 D-Q1 | |||
| 34 | Mazda Miata | Gregg Seigart | FP | 48 | 1:50.884 D-Q2 | 1:50.652 | 1:50.884 D-Q2 | 1:59.629 D-R2 | 2:00.941 D-R2 | +2.699 D-R2 | 109.4 D-Q2 | 43.023 D-Q2 | 39.471 D-Q2 | 28.158 D-Q2 |
| 35 | Fiat 124 Spider (1974) | Douglas Sanders >115% | FP | 10 | 2:08.730 C-R2 | 2:07.979 | 2:08.730 C-R2 | 2:12.245 C-R2 | +3.936 C-R2 | 91.2 C-R2 | 50.604 C-R2 | 42.988 C-R2 | 34.387 C-R2 |
About this data
One row per driver and car (a driver who changed cars has a row for each). Each cell is that driver's best in that car across the selected events, with the session it was set in. The columns are about the car: its best lap, the lap its best sectors add up to, its sector times and trap speed. "Driver metrics" adds two about the driver: the best 5-lap stint (mean of the quickest five consecutive race laps) and consistency (how far the median race lap sat behind the best in that race; small is a driver who does it every lap), both from the race with the best stint. The fastest in each column is purple, and a car whose best lap is more than 115% of the fastest in its class is greyed (marked ">115%" beside the driver) and left out of the colour scale. Click a column to sort, a row to highlight it.
Theoretical lap is the sum of the best sectors, whichever laps they came from, and never slower than the best lap (where a car's fastest laps were recorded without sector times, its best lap is used). The 115% mark is about the car's best lap only: a car whose best lap is within 115% of the fastest in its class is never marked. Greyed sectors with no theoretical lap mean the sector times on file do not add up to a believable lap. Letters refer to the events above; Q is qualifying, R a race.
By car
| Car | Class | Drivers | Lap | Qual | Race | Trap | S1 | S2 | S3 |
|---|---|---|---|---|---|---|---|---|---|
| Ford Mustang | AS/T4 | 6 | 1:34.642Michael Kamalian | 1:35.467Thomas J Ellis | 1:34.642Michael Kamalian | 140.9Michael Kamalian | 37.067Michael Kamalian | 0.916Scotty B White | 24.028Michael Kamalian |
| Ford Mustang | AS | 1 | 1:34.642Michael Kamalian | 1:36.558Michael Kamalian | 1:34.642Michael Kamalian | 140.9Michael Kamalian | 37.067Michael Kamalian | 33.474Michael Kamalian | 24.028Michael Kamalian |
| Ford Mustang (2003) | AS | 1 | 1:35.351Thomas J Ellis | 1:35.467Thomas J Ellis | 1:35.351Thomas J Ellis | 138.3Thomas J Ellis | 37.678Thomas J Ellis | 32.639Thomas J Ellis | 24.384Thomas J Ellis |
| Ford Mustang (2006) | AS | 1 | 1:35.692Gregory Eaton | 1:36.767Gregory Eaton | 1:35.692Gregory Eaton | 132.5Gregory Eaton | 37.336Gregory Eaton | 33.408Gregory Eaton | 24.551Gregory Eaton |
| Ford Mustang GT (2008) | AS | 1 | 1:36.389James Jost | 1:38.195James Jost | 1:36.389James Jost | 138.6James Jost | 38.069James Jost | 32.794James Jost | 24.669James Jost |
| Ford Mustang (2012) | T4 | 1 | 1:41.239Scotty B White | 1:41.847Scotty B White | 1:41.239Scotty B White | 113.1Scotty B White | 38.735Scotty B White | 0.916Scotty B White | 25.791Scotty B White |
| Ford Mustang (2010) | T4 | 1 | 1:41.957Paolo Salvatore | 1:41.957Paolo Salvatore | 1:45.711Paolo Salvatore | 112.0Paolo Salvatore | 38.728Paolo Salvatore | 37.005Paolo Salvatore | 25.885Paolo Salvatore |
| Acura Integra | FP | 2 | 1:37.623Ken Kannard | 1:37.924Ken Kannard | 1:37.623Ken Kannard | 122.9Ken Kannard | 37.585Ken Kannard | 0.792Ken Kannard | 24.740Ken Kannard |
| Mazda Miata | FP/T4 | 10 | 1:38.226Mason Workman | 1:38.226Mason Workman | 1:38.805Mason Workman | 122.4Mark Weber | 37.070Jonathan Neudorf | 0.778Stephen Simonds | 25.160Mason Workman |
| Mazda Miata (1992) | FP | 2 | 1:38.226Mason Workman | 1:38.226Mason Workman | 1:38.805Mason Workman | 120.2Mason Workman | 37.238Mason Workman | 35.576Mason Workman | 25.160Mason Workman |
| Mazda Miata | FP/T4 | 5 | 1:38.841Jonathan Neudorf | 1:38.841Jonathan Neudorf | 1:40.761Jonathan Neudorf | 120.2Perry Simonds | 37.070Jonathan Neudorf | 36.372Jonathan Neudorf | 25.241Jonathan Neudorf |
| Mazda MIata | FP | 1 | 1:40.329Steven Powers | 1:40.329Steven Powers | 1:48.283Steven Powers | 118.4Steven Powers | 38.142Steven Powers | 36.400Steven Powers | 25.684Steven Powers |
| Mazda Miata (1990) | FP | 1 | 1:40.560Stephen Simonds | 1:40.686Stephen Simonds | 1:40.560Stephen Simonds | 113.4Stephen Simonds | 38.314Stephen Simonds | 0.778Stephen Simonds | 25.592Stephen Simonds |
| Mazda Miata - FP (1993) | FP | 1 | 1:41.786Mark Weber | 1:41.786Mark Weber | 1:42.215Mark Weber | 122.4Mark Weber | 39.042Mark Weber | 36.275Mark Weber | 26.155Mark Weber |
| Honda CRX | FP | 1 | 1:38.576Chris Bovis | 1:38.576Chris Bovis | 1:38.655Chris Bovis | 117.3Chris Bovis | 37.788Chris Bovis | 35.332Chris Bovis | 24.941Chris Bovis |
| BMW 325es | FP | 1 | 1:38.885Matt Reppert | 1:38.885Matt Reppert | 1:38.946Matt Reppert | 122.1Matt Reppert | 37.730Matt Reppert | 35.717Matt Reppert | 25.209Matt Reppert |
| Mazda MX-5 | T4 | 6 | 1:39.119Marc Cefalo | 1:39.119Marc Cefalo | 1:40.155Ethan Barker | 118.3Marc Cefalo | 37.431Marc Cefalo | 0.759Robert Spence | 25.184Marc Cefalo |
| Mazda mx5 (2009) | T4 | 1 | 1:39.119Marc Cefalo | 1:39.119Marc Cefalo | 1:41.160Marc Cefalo | 118.3Marc Cefalo | 37.431Marc Cefalo | 36.328Marc Cefalo | 25.184Marc Cefalo |
| Mazda MIATA MX5 (2006) | T4 | 1 | 1:39.976Ethan Barker | 1:39.976Ethan Barker | 1:40.155Ethan Barker | 108.6Ethan Barker | 37.465Ethan Barker | 36.492Ethan Barker | 25.499Ethan Barker |
| Mazda MX-5 | T4 | 2 | 1:40.079Robert Spence | 1:40.079Robert Spence | 1:41.079Kevin Fryer | 118.1Robert Spence | 37.704Kevin Fryer | 0.759Robert Spence | 25.453Robert Spence |
| Mazda MX5 (2010) | T4 | 1 | 1:41.555Richard Mooney | 1:41.555Richard Mooney | 1:44.097Richard Mooney | 109.7Richard Mooney | 38.698Richard Mooney | 36.901Richard Mooney | 25.956Richard Mooney |
| Mazda MX5 (2009) | T4 | 1 | 1:41.856Sergio Zlobin | 1:42.326Sergio Zlobin | 1:41.856Sergio Zlobin | 111.5Sergio Zlobin | 38.506Sergio Zlobin | 36.956Sergio Zlobin | 25.741Sergio Zlobin |
| Honda Civic Del Sol VTEC | FP | 1 | 1:39.502Cliff Ira | 1:39.502Cliff Ira | 1:48.427Cliff Ira | 123.3Cliff Ira | 38.104Cliff Ira | 35.234Cliff Ira | 25.476Cliff Ira |
| Mazda RX-8 | T4 | 1 | 1:39.654Marc Cefalo | 1:40.096Marc Cefalo | 1:39.654Marc Cefalo | 111.1Marc Cefalo | 37.643Marc Cefalo | 36.384Marc Cefalo | 25.393Marc Cefalo |
| Subaru BRZ | T4 | 1 | 1:40.432Angelica Sprehe | 1:40.432Angelica Sprehe | 1:49.609Angelica Sprehe | 123.5Angelica Sprehe | 38.721Angelica Sprehe | 35.608Angelica Sprehe | 25.807Angelica Sprehe |
| Toyota GR86 | T4 | 1 | 1:41.397Angelica Sprehe | 1:41.397Angelica Sprehe | 1:42.072Angelica Sprehe | 121.0Angelica Sprehe | 39.312Angelica Sprehe | 36.256Angelica Sprehe | 25.821Angelica Sprehe |
| Mazda NC | T4 | 1 | 1:41.779Ayden Rose | 1:41.779Ayden Rose | 1:53.918Ayden Rose | 114.8Ayden Rose | 38.819Ayden Rose | 37.079Ayden Rose | 25.717Ayden Rose |
| Chevrolet Camaro Z-28 | AS | 1 | 1:44.301Phillip Waters | 1:44.301Phillip Waters | 2:00.265Phillip Waters | 130.0Phillip Waters | 42.124Phillip Waters | 35.315Phillip Waters | 26.862Phillip Waters |
| Mazda 3S | T4 | 1 | 1:47.885Leann Falk | 1:47.885Leann Falk | 1:49.327Leann Falk | 110.9Leann Falk | 41.580Leann Falk | 38.358Leann Falk | 27.655Leann Falk |
| Scion FR-S | T4 | 1 | 1:48.835Jennifer Roames | 1:48.835Jennifer Roames | 113.0Jennifer Roames | 41.553Jennifer Roames | 38.692Jennifer Roames | 27.238Jennifer Roames | |
| Fiat 124 Spider | FP | 1 | 2:08.730Douglas Sanders | 2:08.730Douglas Sanders | 91.2Douglas Sanders | 50.604Douglas Sanders | 42.988Douglas Sanders | 34.387Douglas Sanders |
About this data
The best any driver of each car managed across the selected events, with who set it. Spellings and model years of the same car are grouped; click a row marked ▸ to see each version. Grouping is worked out from the names, so tell us if two cars are wrongly merged or split.
Rule changes between these events
Super Tour Mar 2023 → Super Tour Mar 2024 2023-03-10 to 2024-03-08
T4 T4 Mustang Brakes/Swaybar
#34036 from Scotty B White · Rule change · TB 23-04 (2023-04 Fastrack)
In T4 Spec Lines, Ford Mustang (2005-2010), change Notes as follows:
"Any sway bar up to F: 35mm and R: 22mm 28mm permitted."
Applies to Ford Mustang on this page: Paolo Salvatore
FP Classification Request for 1978 Toyota Celica
#34097 from Bob Pharr · Rule change · TB 23-05 (2023-05 Fastrack)
addedToyota Celica 78-80 classified FP Prep level 2, 2100–2205 lbs, 2190 cc SOHC four-cylinder, stock carburetion, 11.0:1 compression limit, .450" valve lift limit.As printed in Fastrack
In FP Spec Lines, classify Toyota Celica (78-80) as follows:
A specification table follows in the original; it is not shown here.
SRF Update SRF Front W2 Rain Tire Part Number
#34118 from Robey Clark · Rule change · TB 23-05 (2023-05 Fastrack)
tyres & wheelsSRF front W2 rain tyre Hoosier part number changes from 46100 to 46101 P185/65R13.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Front – Hoosier P/N 46100 1 P185/65R13 W2"
T4 05-06 Mini Wheel Weight
#34112 from Mav Singh · Rule change · TB 23-06 (2023-05 Fastrack)
In T4 Spec Lines, Mini Cooper S (02-04), change as follows:
Wheel Size: "16 x 7 17 x 8"
Add to Notes: "Wheels conforming to B-spec rules are permitted."
In T4 Spec Lines, Mini Cooper S (05-06), change as follows:
Wheel Size: "16 x 7 17 x 8"
Add to Notes: "Wheels conforming to B-spec rules are permitted."
In T4 Spec Lines, Mini Cooper S (07-13), change as follows:
Wheel Size: "17 x 7 8"
T4 06-09 VW Rabbit
#34153 from Cameron Conover · Rule change · TB 23-06 (2023-05 Fastrack)
In T4 Spec Lines, delete Volkswagen Rabbit 2.5 (06-07) in its entirety and change Volkswagen Rabbit 2.5 (08-09) as follows:
"Volkswagen Rabbit 2.5 (08 06-09)"
Add to Notes: "Integrated Engineering intake IEIMVB1-BK allowed with 25lb penalty."
SRF Hoosier SRF Wet Front Tire Rule Update
#34189 from Robey Clark · Rule change · TB 23-06 (2023-06 Fastrack)
tyres & wheelsSRF wet front tyre changes to Hoosier P/N 46100 P185/60R13 H20 or W2 with 2.5" ground clearance.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Wet:
Front – Hoosier P/N 46100 P185/60R13 H20 or W2
Rear – Hoosier P/N 46105 P205/60R13 H20 or W2
Ground clearance is 2.5" with driver as raced when P185/60R13 (H20 or W2) tires are used."
T4 96-01 Audi a4 2.8 Spring Rate
#34217 from Michael Gordhamer · Rule change · TB 23-06 (2023-05 Fastrack)
In T4 Spec Lines, Audi A4 V-6 (96-01) / Volkswagen Passat 2.8 V6 (96-05), change as follows:
Wheel Size: "16 x 7 17 x 8"
Tire Size: "225 245"
Notes: "The following items must remain stock: shock/struts (including mounts), original wheels, and transmission differential -unless specified below. 800lb springs allowed. Front and rear sway bars permitted 32mm max."
FP Request to Classify Sonic and Fiesta in HP
#34264 from Greg Amy · Rule change · TB 23-06 (2023-05 Fastrack)
addedFord Fiesta HP model years change to 11-19; Chevrolet Sonic FP model years change to 12-19.As printed in Fastrack
In HP, adjust model years of the "Ford Fiesta (11-16)" spec line as follows:
"Ford Fiesta (11-16 9)"
In FP, adjust model years of the "Chevrolet Sonic (12-16)" spec line as follows:
"Chevrolet Sonic (12-16 9)"
FP ITC to FP?
#34286 from David Snow · Rule change · TB 23-06 (2023-07 Fastrack)
removed · cars addedHP Volkswagen Rabbit Cabriolet 1780 removed; Rabbit 1588 and 1715 reclassified with year and body-type clarifications.As printed in Fastrack
In HP Spec Lines, Volkswagen Rabbit Cabriolet 1780, delete in its entirely:
In HP, Spec Lines, Volkswagen Rabbit, change Title as follows:
“Volkswagen Rabbit 1588 (includes Cabriolet / convertible)”
“Volkswagen Rabbit 1715 (81-84) (excl. conv.)”
“Volkswagen Rabbit GTI 1780 (83-84)”
T4 2002-2006 Mini Cooper S R53 Spec Line Request
#34336 from Aaron Fitzsimmons · Rule change · TB 23-06 (2023-07 Fastrack)
In T4 Spec Lines, Mini Cooper S (02-04), change Weight as follows:
"2750 2700"
In T4 Spec Lines, Mini Cooper S (05-06), change Weight as follows:
"2750 2700"
FP Correct Intake Valve Size on 1500cc Midget/Spitfire
#34419 from Production Committee · Rule change · TB 23-06 (2023-05 Fastrack)
wordingFP and HP Sprite and Spitfire 1500 intake valve size corrected to 36.6 mm, removing prior decimal specifications.As printed in Fastrack
In FP Spec Lines, Austin-Healey Sprite Mk. I, II,III, IV MG Midget Mk I,II, III, IV & 1500, change Intake Valve Size as follows:
"(I) 36.65.3/(1.44)"
In FP Spec Lines, Triumph Spitfire Mk. IV & 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"
In HP Spec Lines, Triumph Spitfire 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"
In HP Spec Lines, Triumph Spitfire Mk. III & IV 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"
AS Crate Motor Part Numbers
#32944 from Sam Daniels · Rule change · TB 23-08 (2023-08 Fastrack)
wordingAS crate motor part number specification clarified; both CT400 P/N-19370604 and 19370604 engine assemblies permitted for GM vehicles.As printed in Fastrack
In AS, GCR Section 9.1.6.F.2., change as follows:
"GM Performance parts CT400 P/N-1937 → 0604 or 1937 → 0604 engine assembly for GM produced vehicles."
AS Request wheel size change
#33007 from Michael Kamalian · Rule change · TB 23-08 (2023-08 Fastrack)
faster · tyres & wheelsAS Ford Mustang GT 5.0L (15-17) Restricted maximum wheel diameter increases to 19.0 inches.As printed in Fastrack
In AS Spec Lines, Ford Mustang GT 5.0l (15-17) Restricted Preparation, change Notes as follows:
"Max. Wheel Size: Dia.18.0 19.0 inches."
Applies to Ford Mustang on this page: Michael Kamalian
AS Alternative Upper Front Control Arms for Dodge Challenger
#33352 from Clark Cambern · Rule change · TB 23-08 (2023-08 Fastrack)
wordingAS Dodge Challenger 5.7L/6.1L/6.4L V8 allows alternate front upper control arms; SPC-66045 spec part removed.As printed in Fastrack
In AS SPEC Lines, Dodge Challenger (08-20) Restricted Preparation 5.7L, 6.1L, or 6.4L V8 (Iron block, Aluminum heads), 2
valves/cylinder, change Notes as follows:
"SPC-66045 Alternate front upper control arms are permitted."
AS Front Brake Caliper Adapters for Dodge Challenger
#33353 from Clark Cambern · Rule change · TB 23-08 (2023-08 Fastrack)
otherAS Dodge Challenger 5.7L/6.1L/6.4L V8 now allows alternate front brake calipers with adaptor brackets for component compatibility.As printed in Fastrack
In AS SPEC Lines, Dodge Challenger (08-20) Restricted Preparation 5.7L, 6.1L, or 6.4L V8 (Iron block, Aluminum heads), 2
valves/cylinder, change Notes as follows:
"Stock brakes or alternate Dodge brakes (Part numbers: front caliper (0517 → 5106 (R) and 0517 → 5107 (L); rear caliper (R1542564 (R)
and R1542565 (L))) may be used with the brake rotor sizes listed in this specification line. Alternate brackets may be used to
facilitate updated/backdated components."
T4 Rules Clarification for Mazda RX8 Spec Line
#34395 from Colin Koehler · Rule change · TB 23-08 (2023-08 Fastrack)
wordingMazda RX-8 T3 and T4 transmission and final drive pairing requirement removed; T4 gains Mazdaspeed radiator, spring kit, restrictor, spoiler, air dam.As printed in Fastrack
In T3 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change notes as follows:
"Use of 2009 R3 transmission is permitted with alternate gear ratios as listed. R3 transmission must be paired with the listedalternate final drive. Front sway bar permitted 32mm MAX rear sway bar 19 MAX, Front springs max 750, 500 rear. Cold air
intake permitted. Header permitted. Aftermarket flywheel and single disc clutch permitted with no weight penalty."
In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change notes as follows:
"Mazdaspeed radiator #0000-01-8501 allowed. Use of 2009 R3 transmission is permitted with alternate gear ratios as listed. R3transmission must be paired with the listed alternate final drive. Mazdaspeed coil spring kit #QSEA-34-01Z allowed. 60mm flat
plate restrictor required. OE Rear spoiler allowed #F151-V4-920F. OE front air dam allowed #F151-V4-900f-BB. Springs Allowed:
(F) Mazda Motorsports- 0000- 04-9700-08 or Eibach- 0800.250.0700 (R) Mazda Motorsports- 0000-04-9400-07 or Eibach
0700.250.0400, and helper 0000-04-9926 allowed. Alternate sway bars allowed max 32mm (f) 19mm (r)."
Applies to Mazda RX-8 on this page: Marc Cefalo
T4 rule book corrections
#34437 from Chi Ho · Rule change · TB 23-08 (2023-08 Fastrack)
addedT3 BMW 320i 14–15 gains aftermarket intercooler; T4 BMW 320i 14–15 loses it.As printed in Fastrack
In T3 Spec Lines, BMW 320i (14-15), add to Notes the following:
"Aftermarket intercooler permitted."
In T4 Spec Lines, BMW 320i (14-15), remove from Notes the following:
"Aftermarket intercooler permitted."
T4 Ride Height Correction for the T3 Solstice.
#34615 from Joe Aquilante · Rule change · TB 23-08 (2023-08 Fastrack)
suspension & brakesT3 and T2 Pontiac Solstice GXP 07-09 minimum ride height set to 3 inches.As printed in Fastrack
In T2 Spec Lines, Pontiac Solstice GXP Coupe / Convertible (07-09), add to Notes the following:
"Minimum ride height is 3 inches."
In T3 Spec Lines, Pontiac Solstice GXP Coupe / Convertible (07-09), add to Notes the following:
"Minimum ride height is 3 inches."
T4 Inclusion of similar car. (CLK 320)
#34626 from Patrick Morgan · Rule change · TB 23-09 (2023-09 Fastrack)
In T4 Spec Lines, Mercedes Benz CLK 320 Coupe (2004), change as follows:
"Mercedes Benz CLK 320 Coupe, C320 Sedan (2004 2000-2007)
SRF SRF Radiator Rule Update
#34805 from Robey Clark · Rule change · TB 23-10 (2023-10 Fastrack)
addedSRF radiator options expanded: Enterprises P/N 480465 with baffle 480464, 480466, or Automotive 1R698 and CU698 allowed if cross-reference equivalent.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.V.j, change as follows:
"Radiator - Enterprises new style P/N 480465 (requires baffle P/N 480464) or P/N 480466 can be used. P/N 480466, may can be
replaced with Automotive P/N 1R698, CU698 or equivalent OEM manufacturer justified by one cross-reference chart equivalent,
as long as the size, shape, and material are the same as the original P/N. The capacity, core thickness, etc., cannot be changedeven if allowed under the above. The competitor is responsible for providing this documentation of the cross-reference P/N."
FP Porsche 944/924S Rule Change Request
#35002 from Adam Achepohl · Rule change · TB 23-12 (2023-12 Fastrack)
slower · weightEP Porsche 944/924S combines 2.5L and 2.7L variants (83-89), raises weight to 2250–2415 lbs, allows 2681cc displacement.As printed in Fastrack
In EP Spec Lines, delete the Porsche 944/924S 2.5L (2V) (83-88) spec line entirely, and create a new spec line for Porsche
944/924S 2.5L(2V) 2.7L(2V) (83-89) as follows:
A specification table follows in the original; it is not shown here.
FP FP and HP Toyota Corolla
#35030 from Keith Church · Rule change · TB 23-12 (2023-12 Fastrack)
faster · weightFP Toyota Corolla 2TC loses 43 lbs to 1810; HP Corolla loses 50–52 lbs to 1910–2006.As printed in Fastrack
In FP Spec Lines, Toyota Corolla 2TC (71-74), change weight as follows:
"1853 1810"
In HP Spec Lines, Toyota Corolla (71-74), change weight as follows:
“1960 1910
* 2009 1958
** 2058 2006”
FP Triumph GT6 Adjustments
#35054 from ANTHONY PARKER · Rule change · TB 23-12 (2023-12 Fastrack)
faster · weightEP Triumph GT6 minimum weight drops to 1800 lbs.As printed in Fastrack
In EP Spec Lines, Triumph GT6, change weight as follows:
"1830 1800"
T4 Mazda MX-5 ND1 Spec Line Request
#34232 from Josh Smith · Rule change · TB 24-01 (2024-01 Fastrack)
In T4 Spec Lines, Mazda MX-5 Miata/Club/ RF (16-18), change as follows:
Weight: "2650 2700"
Notes: "Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must
remain stock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from
moving action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette,
including Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r)
sway bars allowed. Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs
#0000-04-9700-08, rear springs #0000-04-9400-07, helper springs #0000-04-HLPR-EB (optional). Up to 500lb front and 300lb rear
Show 1 more lines
springs allowed. Mazda Motorsports Header part #0000-06-5410 allowed. Mazda tower brace 0000-04-5626 allowed."
SRF Update SRF Rain / Brake Rule
#34706 from Robey Clark · Rule change · TB 23-09 (2023-09 Fastrack)
otherSRF rain/brake light must be Super Bright LEDs Inc. P/N PT-STRB-R24; secondary filament must connect to rain light switch.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.W.l, change as follows:
"A Super Bright LEDs Inc. rain / brake light comprised of a single standard trailer oval lamp, 2-1/4 inches x 6-1/2 inches, withincandescent or LED illumination, P/N PT-STRB-R24, is required in the original roll hoop mounting location. This rule supersedes
GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. No changes may be made to the original 3-pin connector on the
wiring harness. The secondary filament of the brake light assembly shall must be connected to a switch enabling its use as a rain
light."
SRF Update SRF Brake Light Rule v1
#34853 from Robey Clark · Rule change · TB 23-10 (2023-10 Fastrack)
otherSRF brake light must be Super Bright LEDs Inc. P/N PT-STRB-R24, with SCCA Enterprises P/N 180427A pigtail and strobing rain light kit.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.W.l, change as follows:
"A Super Bright LEDs Inc. P/N PT-STRB-R24 (SCCA Enterprises P/N 180427A) rain / brake light, P/N PT-STRB-R24, is required in the
original roll hoop mounting location. This rule supersedes GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. No
changes may be made to the original 3-pin connector on the wiring harness. An SCCA Enterprises P/N 1190503 Strobing Brake
Light Pigtail is required. The secondary filament of the brake light assembly must be connected to a switch enabling its use as
a strobing rain light. A Strobing Brake Light Kit P/N 1168003 is available, which includes the brake light and pigtail."
T4 BRZ/FRS/86 Spring Allowance
#35038 from Luis Goncalves · Rule change · TB 24-01 (2024-01 Fastrack)
In T4 Spec Lines, Scion FR-S/10 series (13-16), change Notes as follows:"Eibach 82105.320, 4.10582 and SPC 67660 allowed. Eibach 82105.320 sway bar kit allowed. Eibach 4.10582 springs or 225 lb (f)
and 300 lb (r) springs allowed. SPC 67660 allowed. Front strut tower brace allowed. Raceseng, part # raceseng-ft86-r-shock-top
permitted. Non-OEM limited slip differential allowed with +50 lbs. weight penalty. 55mm flat plate restrictor required. Only 17”
wheels permitted."
In T4 Spec Lines, Subaru BRZ/ BRZ Limited (13-16), change Notes as follows:
"Eibach 82105.320, 4.10582 and SPC 67660 allowed. Eibach 82105.320 sway bar kit allowed. Eibach 4.10582 springs or 225 lb (f)
and 300 lb (r) springs allowed. SPC 67660 allowed. Front strut tower brace allowed. Raceseng, part # raceseng-ft86-r-shock-top
Show 12 more lines
permitted. Non-OEM limited slip differential allowed with +50 lbs. weight penalty. 55mm flat plate restrictor required. Only 17”
wheels permitted."
In T4 Spec Lines, Subaru BRZ (17-21), change Notes as follows:
"Eibach 82105.320, 4.10582 and SPC 67660 allowed. Eibach 82105.320 sway bar kit allowed. Eibach 4.10582 springs or 225 lb (f)
and 300 lb (r) springs allowed. SPC 67660 allowed. Front strut tower brace allowed. Raceseng, part # raceseng-ft86-r-shock-top
permitted. Non-OEM limited slip differential allowed with +50 lbs. weight penalty. 55mm flat plate restrictor required. Only 17”
wheels permitted."
In T4 Spec Lines, Toyota 86, GT (17-21), change Notes as follows:
"Eibach 82105.320, 4.10582 and SPC 67660 allowed. Eibach 82105.320 sway bar kit allowed. Eibach 4.10582 springs or 225 lb (f)
and 300 lb (r) springs allowed. SPC 67660 allowed. Front strut tower brace allowed. Raceseng, part # raceseng-ft86-r-shock-top
permitted. Non-OEM limited slip differential allowed with +50 lbs. weight penalty. 55mm flat plate restrictor required. Only 17”
wheels permitted."
Applies to Subaru BRZ on this page: Angelica Sprehe
FP FP data
#35060 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)
In FP Spec Line, Acura Integra LS (94-01), change weight as follows:
"2235 2260
*2291 2317
**2347 2373"
In FP Spec Line, Honda Del Sol VTEC (94-97), change weight as follows:
"2190 2265
*2245 2322
**2300 2378"
Applies to Acura Integra on this page: Ken Kannard, Les Chaney
Applies to Honda Civic Del Sol VTEC on this page: Cliff Ira
FP Request to Review Z3 2.5 Spec Line
#35073 from Tim Schreyer · Rule change · TB 24-01 (2024-01 Fastrack)
slower · weightEP BMW Z3 2.5L minimum weight increased to 2500 lbs, 2563 lbs with power adder, 2625 lbs with two power adders.As printed in Fastrack
In EP spec line, BMW Z3 2.5L, change weight as follows:
"2450 2500
*2511 2563
**2573 2625"
T4 TSX Allowance
#35219 from Oscar Jackson · Rule change · TB 24-01 (2024-01 Fastrack)
In T4 Spec Lines, Acura TSX (2004-2008), add to Notes the following:
"Header allowed."
T4 Requested Update of Model Years of 370Z
#35231 from Richard Kulach · Rule change · TB 24-01 (2024-01 Fastrack)
addedT3 Nissan 370Z now includes model years 2009–2022 with Nismo editions.As printed in Fastrack
In T3 Spec Lines, Nissan 370Z (09-16) / 370Z NISMO Edition (09-13), change model as follows:
"Nissan 370Z (09-16) / 370Z NISMO Edition (09-13) ,incl. Nismo (2009-2022)"
FP Corrections to Honda Spec Lines in FP
#35250 from Jonathan Spiegel · Rule change · TB 24-01 (2024-01 Fastrack)
unclearFP Honda throttle body inside diameters corrected across seven models: Civic 1.5 to 42", Civic Si to 55", CRX 1.5 to 42", CRX 84-87 to 33/42", CRX Si 88-91 to 55".As printed in Fastrack
In FP Spec Lines, change Fuel Injected Equipped Throttle Body Inside Diameter as follows:
Acura Integra GSR (92-93): "58"
Honda Civic 1.5 (88-91): "NA 42"
Honda Civic EX (90-91): "55"
Honda Civic Si (88-91): “42 55”
Honda CRX 1.5 (88-91): “33 (primary) 42 (secondary) 42”
Honda CRX / CRX Si (84-87): ”42 33 (primary) 42 (secondary)”
Honda CRX Si (88-91): ”NA 55”
FP Miata Alternate Head
#35253 from Don Tucker · Rule change · TB 24-01 (2024-01 Fastrack)
faster · weightEP Mazda MX-5 1.8L (90-97) minimum weight cut to 2150 lbs; (94-97) variants to 2000, 2050, 2100 lbs.As printed in Fastrack
In EP Spec Lines, Mazda MX-5 /Miata 1.8L (90-97), change weight as follows:
"2200 2150"
Mazda MX-5 /Miata (94-97)
"2035 2000
*2086 2050
**2137 2100"
FP Triumph GT6 Adjustments
#35255 from Anthony Parker · Rule change · TB 24-01 (2024-01 Fastrack)
slower · weightEP Triumph GT6 dual 1.75-inch carburetors weight rises to 1940 lbs; triple Weber 40 DCOE option added at 1990 lbs.As printed in Fastrack
In EP spec line, Triumph GT6, make the following change in the Notes section:
"Two (2) 1.75” auto-type carburetors @ 1970 40 lbs. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive. Three (3) Weber 40mm DCOE w/28mm venturi on individualrunner manifold @ 2020 lb."
SRF SRF / SRF3 Rule Updates
#35268 from Robey Clark · Rule change · TB 24-01 (2024-01 Fastrack)
suspension & brakesSRF adds mandatory front brake ducts 12–36 inches, throttle pedal heel-toe extension, braided stainless flex lines, camber limit 5.0 degrees, radiator opening height 3½ ± ½ inches, rear shift cable clamp P/N WM302007A.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.H, add the following:
"NO MODIFICATIONS ALLOWED. Front brake ducts are required, attached to the openings in the lower radiator baffles, any
flexible 4" duct material allowed, installed length minimum 12" maximum 36" in length. Must be securely fastened, Bracket Part# P/N 800368 can be used. Shall Must serve no other purpose. An extension may be welded to the side of the throttle pedal to
improve heel-and-toe braking. Master cylinder casting / location must be used as delivered on P/N 180110 Pedal Mounting
support. Aeroquip style -3 braided stainless flex lines only, must attach to all brake components without modification. Brake pad
"anti-rattle" clips must be removed."
In SRF, GCR section 9.1.8.D.1.V, add the following:
"ii. Rear SADEV shift cable aluminum two-piece style clamp may be used. The P/N WM302007A clamp must serve no other
purpose."
In SRF, GCR section 9.1.8.D.1.X.k, add the following:
"Negative camber shall must not exceed 5.0 degrees absolute maximum front and rear."
In SRF, GCR section 9.1.8.D.1.AA.b, add the following:
"2. Height of the radiator opening vertical surface 3 1/2“ +/- 1/2"."
P2 Engine Table B.1
2008 and older Stock
Suzuki, Yamaha,
Honda, BMW
38.5mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 38.5mm
Modified
Engine
950 lbs.
1005cc max
P2 Engine Table B.1
2008 and older 37mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 39mm
Stock Engine
1050 lbs.
FP Honda S2000 throttle body
#35272 from Aaron Johnson · Rule change · TB 24-01 (2024-01 Fastrack)
faster · inductionEP Honda S2000 fuel injected throttle body inside diameter increases from 62mm to 64mm.As printed in Fastrack
In EP spec line, Honda S2000, make the following changes to its spec line:
Fuel Injected Equipped Throttle Body Inside Diameter: "62 64"
Notes: "Comp. Ratio limited to 12.0:1. Valve lift limited to .500”. An adaptor plate can be used to mount the 62mm throttle body
from '00-05 to the '06-09 intake manifold. The adaptor plate can be no more than 1.25" thick, and its bore must not exceed the
"Fuel Injected Equipped Throttle Body Inside Diameter" maximum spec of 64mm."
FP Correction within Triumph TR8 Spec Line
#35315 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)
wordingEP Triumph TR8 dry sump allowance moved from Carburetor line to Notes.As printed in Fastrack
In EP spec line, Triumph TR8 (78-81), move the "Dry sump allowed" wording to the appropriate location as follows:
Carburetor. No. & Type: “Zenith Stromberg carbs or fuel injection. Dry sump is allowed.”
Notes: “Comp. Ratio limited to 12.0:1, Valve lift limited to .500”. Dry sump is allowed.”
FP Correction to EP 924S/944 Spec Line
#35317 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)
weightEP Porsche 944/924S 2.5L and 2.7L minimum weights corrected: 2479cc to 2306–2363 lbs, 2681cc to 2358–2415 lbs.As printed in Fastrack
In EP spec line, Porsche 944/924S 2.5L (2V) / 2.7L (2V) (83-89), change Weight as follows:
A specification table follows in the original; it is not shown here.
T4 More Car Lightening Stuff
#35319 from Scotty B White · Rule change · TB 24-02 (2024-02 Fastrack)
removedT2, T3, T4 battery replacement no longer allows alternate manufacturer batteries within 10% OEM weight.As printed in Fastrack
In GCR, Section 9.1.9.2.D.1.g.3., change as follows:
"Batteries may be replaced provided the replacement is capable of starting the car. Batteries may not be relocated
unless noted on the spec line. Batteries must be adequately secured. Battery labeling must conform to 9.3.35.D. withthose of an alternate manufacturer, provided they are of similar amp-hour capacity, size and within 10% of OEMweight."
T4 ND Missed Items
#35352 from Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), add to Notes the following:
"3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804-
02, 0000-02-5804-01)."
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-21), add to Notes the following:
"3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804-
02, 0000-02-5804-01)."
T4 Inclusion of B-C spec cars in T4
#35374 from Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)
addedT4 now allows C-Spec touring cars to compete, in addition to existing B-Spec eligibility.As printed in Fastrack
In GCR, Section 9.1.9.2., change as follows:
"Touring car eligibility: Cars are eligible for the class they are listed with a specification line and with the specific
allowances permitted. In addition, T2-T4 cars may race one class up in touring classes above their specification line class
as long as they are a legal T2-T4 car and conform to their specification line allowances as classified. Cars conforming to
C-Spec rules are permitted to compete in Touring 4."
T4 T2-T4 Set expiration dates on spec lines
#35378 from Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)
removedT2, T3, T4 spec lines expire 12/31/24; submit to appeal or cars are removed from class.As printed in Fastrack
In T2-T4 Spec Lines, add **This Spec line will expire 12/31/24, Please submit to appeal**
to Notes to the following Spec Lines:
T2:
Acura TL SHAWD (10-13)
Audi S4 (12-14)
Audi S5 (13-14)
Audi TT RS (2018-)
Cadillac ATS-V (16-17)
Cadillac CTS-V (06-07)
Chevrolet Camaro SS (98-02)
Honda Civic (2017-)
Saturn Sky / Convertible (07-09)
Subaru Impreza WRX STi (03-07)
Subaru Impreza WRX STi (08-11)
T3:
Audi S4 (10-11)
Audi S4 (12-14)
Audi TTS Coupe (10-11)
Cadillac ATS (2015)
Chevrolet Cobalt (05-07)
Dodge SRT-4 (03-05)
Ford Fiesta ST (2014-)
Hyundai Genesis Coupe (2010-)
Hyundai Veloster Turbo (18-21)
Mazda RX-8 Base/R3/Sport/ GT (04-12)
Mini Cooper S (2016-)
Subaru WRX (02-05)
Toyota Camry (11-15)
T4:
Acura Integra GS-R VTEC (3 or 4 door) (94-01)
Audi A4 V-6 (96-01) / Volkswagen Passat 2.8 V6 (96-05)
BMW 320i (14-15)
Chevrolet Cobalt SS, Sport Coupe (06-10)
Chevrolet Sonic RS (2011-)
Chrysler/Dodge Neon ACR SOHC (4 door) (01-02)
Dodge Dart (14-15)
Dodge/Plymouth Neon ACR SOHC/DOHC (2/4 door) (95-99)
Fiat 500 Abarth (12-14)
Ford Focus SVT (02-04)
Ford Focus ZX4 ST (05-06)
Ford Focus (08-11)
Ford Mustang V-6 (01-04)
Honda Accord LX & EX (03-07)
Honda Accord LX-S/EX/EX-L (08-12)
Honda Civic Coupe Si (99-00)
Honda Civic SI (02-03)
Hyundai Elantra GLS (11-12)
Hyundai Tiburon V-6 (03-08)
Hyundai Veloster Turbo/ R-Spec (14-15)
Kia Forte Koup and Sedan LX/EX (10-13)
Kia Forte Koup and Sedan SX (10-13)
Kia Forte Koup (14-15)
Mazda Protégé ES (2000)
Mazda Protégé 5 (02-03)
FP Update 1988-1991 Civic to Match 1988-1991 CRX
#35399 from Enrik Benazic · Rule change · TB 24-02 (2024-01 Fastrack)
faster · weightHP Honda Civic 1.5 1988-91 minimum weight drops 70 lbs to 2175; also 2-speed and 3-speed minimums cut 72 and 73 lbs.As printed in Fastrack
In HP, make the following weight change:
Honda Civic 1.5 (88-91)“2245 2175
*2301 2229
**2357 2284”
AS Request to Classify 1970-1981 Camaro and Firebird in AS
#33659 from Brandon Vivian · Rule change · TB 24-03 (2024-03 Fastrack)
addedChevrolet Camaro, Pontiac Firebird 70–81 Full Prep classified in AS at 3400–3600 lbs with 108.0 wheelbase, specific head castings, and suspension modifications permitted.As printed in Fastrack
In AS Spec Lines, classify Chevrolet Camaro, Pontiac Firebird (70-81) Full Prep as follows:
AS Wheelbase Gear Ratios
Std. (or Alt.)
Brakes
(Max)
(in/mm)
Weight (lbs) Notes:
A specification table follows in the original; it is not shown here.
AS Fuel Cell 12
#34194 from Clark Cambern · Rule change · TB 24-03 (2024-03 Fastrack)
addedAS class adds fuel cell location notes to multiple Cadillac, Chevrolet, Dodge and Ford models: cells within 24 inches of standard tank.As printed in Fastrack
In AS Spec Lines, add to Notes as follows:
Cadillac CTS-V (04-07): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken
from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell.”
Chevrolet/Pontiac Camaro & Firebird (93-02): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch
measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with
installation of a safety fuel cell.”
Chevrolet/Pontiac Camaro & Firebird (93-02): “Fuel cells must be located within 24 inches of the standard tank. The 24
inch measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with
installation of a safety fuel cell.”
Chevrolet Camaro SS (V8) (10-15): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch
measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with
installation of a safety fuel cell.”
Chevrolet Camaro (10-15): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is
taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a
safety fuel cell.”
Dodge Challenger (08-20): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is
taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a
safety fuel cell.”
Ford Mustang GT (05-14): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is
taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a
safety fuel cell.”
Ford Mustang Coupe GT (05-14): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch
measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with
installation of a safety fuel cell.”
Ford Mustang GT 5.0l (15-17): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement
is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a
safety fuel cell.”
Ford Mustang GT (05-14): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is
taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a
safety fuel cell.”
T4 Reorganize Spec Lines
#35375 from Touring Committee · Rule change · TB 24-03 (2024-03 Fastrack)
addedT2, T3, T4 Spec Lines remove wheelbase requirement, add Required Restrictor specification.As printed in Fastrack
In T2-T4 Spec Lines, change Spec Line as follows:
"Wheel- base (mm) Required Restrictor"
T4 Allow any 400lb rear spring in the RX8
#35433 from Raymond Blethen · Rule change · TB 24-03 (2024-03 Fastrack)
In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change Notes as follows:
"Mazda Motorsports- 0000- 04-9700-08 or Eibach- 0800.250.0700 (R) Mazda Motorsports- 0000-04-9400-07 or Eibach0700.250.0400, and helper 0000-04-9926 allowed. Springs allowed 700lb (f), 400(r)."
Applies to Mazda RX-8 on this page: Marc Cefalo
AS Please Classify the 6th Gen Into AS.
#35448 from Daniel Richardson · Rule change · TB 24-03 (2024-03 Fastrack)
addedChevrolet Camaro 6th gen Full Prep added to AS class at 3400 lbs base or 3600 lbs with built engine.As printed in Fastrack
In AS Spec Lines, classify Chevrolet Camaro (16-) Full Prep as follows:
AS
Wheelbase Gear Ratios
Std. (or Alt.)
Brakes
(Max)
(in/mm)
Weight (lbs) Notes:
Chevrolet
Camaro (16-)
Full Prep
110.6 3.42, 2.28,
A specification table follows in the original; it is not shown here.
T4 370Z Brake Rotor Size Correction
#35487 from Derek Chan · Rule change · TB 24-03 (2024-03 Fastrack)
suspension & brakesT2 and T3 Nissan 370Z front brake rotors increase to 355×32 mm, rears to 350×20 mm.As printed in Fastrack
In T2 Spec Lines, Nissan 370Z (09-17) / 370Z NISMO Edition (09-17), change Brakes (mm) as follows:
"(F)320 x 28 Vented R)320 x 16 Vented : (F) 355x32mm Vented(R) 350x20mm Vented”
In T3 Spec Lines, Nissan 370Z, incl. Nismo (2009-2022), change Brakes (mm) as follows:
"(F)320 x 28 Vented (R)320 x 16 Vented : (F) 355x32mm Vented(R) 350x20mm Vented”
FP GCR Correction - Redundant HP Spec Lines
#35623 from Production Committee · Rule change · TB 24-03 (2024-03 Fastrack)
removedHP removes four redundant VW spec lines: Rabbit Cabriolet 1780, Scirocco 1588, Scirocco 1780 8-valve 83-88, Scirocco 1588.As printed in Fastrack
In HP Spec Lines, delete the following redundant spec lines in their entirety:
Spec line #10 - VW Rabbit Cabriolet 1780
Spec line #3 - VW Scirocco 1588
Spec line #4 - VW Scirocco 1780 (8-valve) (83-88)
Spec line #5 - VW Scirocco 1588
AS spec lines
#35713 from American Sedan Committee · Rule change · TB 24-03 (2024-03 Fastrack)
unclearAS class: Ford Mustang GT 05-14 Restricted prep added; Cadillac CTS-V 04-07 to 3450 lbs; Camaro/Firebird variants reconfigured with weight and notes changes; Dodge Challenger 08-20 restrictor 76mm to 80mm; Ford Mustang variants updated wei…As printed in Fastrack
In AS Spec Lines, classify Ford Mustang GT (05-14) with Restricted prep Engine as follows:
AS
Wheelbase Gear Ratios Std.
A specification table follows in the original; it is not shown here.
Applies to Ford Mustang on this page: Michael Kamalian, Gregory Eaton, James Jost
FP Update FP Protege (01-03) Model Info
#35715 from Production Committee · Rule change · TB 24-03 (2024-03 Fastrack)
wordingFP Mazda Protégé ES (01-03) renamed to Mazda Protégé ES/5 (01-03).As printed in Fastrack
In FP Spec Lines, Mazda Protégé ES (01-03) change vehicle as follows:
"Mazda Protégé ES/5 (01-03)"
Super Tour Mar 2024 → Super Tour Mar 2025 2024-03-08 to 2025-03-07
AS Restricted Prep Aftermarket Parts Request
#35682 from Tom Aquilante · Rule change · TB 24-04 (2024-04 Fastrack)
addedAS Camaro, Firebird 93-02 and GTO 04-06 add approved LS1 connecting rod part numbers to Notes.As printed in Fastrack
In AS Spec Lines, Chevrolet/Pontiac Camaro & Firebird (93-02), add to Notes the following:
"For the LS1connecting rods Callies p/n CSC6100DS6A2AH, Scat rods p/n 2-1CR6100-944, GM performance rods p/n 12649190."
In AS Spec Lines, Pontiac GTO (04-06), add to Notes the following:
"For the LS1connecting rods Callies p/n CSC6100DS6A2AH, Scat rods p/n 2-1CR6100-944, GM performance rods p/n 12649190."
Applies to Chevrolet Camaro Z-28 on this page: Phillip Waters
T4 Corrections to T4 RX8 Spec line
#35767 from Touring Committee · Rule change · TB 24-04 (2024-04 Fastrack)
In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change Notes as follows:
"Mazdaspeed radiator #0000-01-8501 allowed. Mazdaspeed coil spring kit #QSEA-34-01Z allowed. OE Rear spoiler allowed
#F151-V4-920F. OE front air dam allowed #F151-V4-900f-BB. Springs allowed 700lb (f) max, 400(r) max. Oil metering pump may
be bypassed. Alternate sway bars allowed max 32mm (f) 19mm (r)."
Applies to Mazda RX-8 on this page: Marc Cefalo
AS Allowance of 11
#35824 from American Sedan Committee · Rule change · TB 24-04 (2024-04 Fastrack)
faster · tyres & wheelsAS Cadillac CTS-V, Chevy Camaro SS V8, Dodge Challenger, Ford Mustang GT 5.0L, Pontiac GTO allowed 11" wheels until 3/1/25.As printed in Fastrack
In AS Spec Lines, Cadillac CTS-V (04-07), add to Notes the following:
"11" wide wheels can be used until 3/1/25."
In AS Spec Lines, Chevrolet Camaro SS (V8) (10-15), add to Notes the following:
"11" wide wheels can be used until 3/1/25."
In AS Spec Lines, Dodge Challenger (08-20), add to Notes the following:
"11" wide wheels can be used until 3/1/25."
In AS Spec Lines, Ford Mustang GT 5.0l (15-17), add to Notes the following:
"11" wide wheels can be used until 3/1/25."
In AS Spec Lines, Pontiac GTO (04-06), add to Notes the following:
"11" wide wheels can be used until 3/1/25."
Applies to Ford Mustang on this page: Michael Kamalian
AS 6th gen Camaro limited prep
#35733 from American Sedan Committee · Rule change · TB 24-05 (2024-05 Fastrack)
addedAS Chevrolet Camaro 1LE (2016-) added with 3600 lbs minimum weight, 275 tires, 60mm restrictor, 345/338mm brakes.As printed in Fastrack
In AS Spec Lines, classify Chevrolet Camaro 1LE (2016-) as follows:
AS Wheelbase Gear Ratios Std. (or Alt.)
Brakes
(Max)
(in/mm)
Weight (lbs.) Notes:
Chevrolet
Camaro, 1LE
(2016-)
110.6 2.66,1.78,1.30,0.74,.5 (F)
A specification table follows in the original; it is not shown here.
T4 Allow T4 and T3 RX8 to Disable/Remove Factory Oil Inj.
#35761 from David Mead · Rule change · TB 24-05 (2024-05 Fastrack)
added · engineT3 and T4 Mazda RX-8 may remove or disable factory oil injection system.As printed in Fastrack
In T3 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), add to Notes as follows:
"OEM oil injection system may be removed or disabled."
In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), add to Notes as follows:
"OEM oil injection system may be removed or disabled."
Applies to Mazda RX-8 on this page: Marc Cefalo
AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK
#35825 from Desi Colon · Rule change · TB 24-05 (2024-05 Fastrack)
addedAS Chevrolet/Pontiac Camaro & Firebird 82–92 5.7L LS1 classified: 3200 lbs, 13.1×1.27 disc brakes, 17 in max wheel, 65 mm restrictor, SLP intake lid permitted.As printed in Fastrack
In AS Spec Lines, classify Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V-8 LS1 (Aluminum Block, Aluminum Heads) 2 valves
per cylinder, as follows:
AS Wheelbase Gear Ratios Std.
A specification table follows in the original; it is not shown here.
T4 2023 ND2 Miata Classification and Allowances
#35837 from Coyote Black · Rule change · TB 24-05 (2024-05 Fastrack)
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-21), change Year as follows:
"(19-21 24)"
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-21), add to Notes as follows:
"Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs #0000-04-9700-
08, springs up to 500lb front and 300lb rear allowed. Mazda tower brace 0000-04-5626 allowed."
T4 Errors and Omissions for 06-09 VW Rabbit Rotor
#35851 from Andrew Burke · Rule change · TB 24-05 (2024-05 Fastrack)
In T4 Spec Lines, Volkswagen Rabbit 2.5 (06-09), change Brakes as follows:
"(F) 228 288 Vented Disc (R) 260 Solid Disc"
FP Request to Replace CRX Plastic Panels
#35876 from Darryl Saylor · Rule change · TB 24-05 (2024-05 Fastrack)
addedFP Honda CRX 84-87 plastic front header nose panel, rocker skirts, door caps can now be replica alternate material stock appearance.As printed in Fastrack
In FP spec line "Honda CRX / CRX Si (84-87)", add the following wording to the Notes section:
"The plastic OE front header/nose body panel, lower rocker side-skirt, and lower door cap panel can be replaced by a
replica, which may be constructed of an alternate material, provided its appearance remains stock."
AS Full Prep Head
#35891 from American Sedan Committee · Rule change · TB 24-05 (2024-05 Fastrack)
added · engineAS Chevrolet Camaro, Firebird, and Ford Mustang now permit Flo Tek cylinder heads in multiple generations.As printed in Fastrack
In AS Spec Lines, Chevrolet/Pontiac Camaro & Firebird (82-92), add to Notes the following:
"Flo Tek Head part #102-500 are permitted."
In AS Spec Lines, Chevrolet/Pontiac Camaro & Firebird (93-02), add to Notes the following:
"Flo Tek Head part #102-500 are permitted."
In AS Spec Lines, Chevrolet Camaro (10-15), add to Notes the following:
"Flo Tek Head part #102-500 are permitted."
In AS Spec Lines, Ford Mustang Incl. Cobra & Cobra R (79-93) and Mercury Capri (79-86), add to Notes the following:
"Flo Tek Part # 203-500 are permitted."
In AS Spec Lines, Ford Mustang Including Cobra 94-04, add to Notes the following:
"Flo Tek Part # 203-500 are permitted."
In AS Spec Lines, Ford Mustang GT (05-14), add to Notes the following:
"Flo Tek Part # 203-500 are permitted."
Applies to Chevrolet Camaro Z-28 on this page: Phillip Waters
Applies to Ford Mustang on this page: Michael Kamalian, Thomas J Ellis, Gregory Eaton, James Jost
FP FP data and parity
#35896 from Production Committee · Rule change · TB 24-05 (2024-05 Fastrack)
added · inductionFP Acura Integra 90-01 and Honda Civic Del Sol VTEC, Civic Si 99-00 require 55mm flat plate intake restrictor.As printed in Fastrack
In the following FP spec lines, add the following wording to the Notes section:
Acura Integra (90-93)
Acura Integra LS (94-01)
Acura Integra GSR (92-93)
Honda Civic Del Sol VTEC (94-97)
Honda Civic Si (99-00)
"55mm Flat Plate Intake Restrictor is required."
T4 Driveshafts
#35916 from Scotty B White · Rule change · TB 24-05 (2024-05 Fastrack)
slower · weightT2, T3, T4 driveshafts may use carbon fiber, aluminum, or steel; two-piece replaced with one-piece; non-OEM adds 25 lbs.As printed in Fastrack
In GCR Section 9.1.9.2.D.4.b., add the following:
"6. T2-T3- Driveshafts may be replaced with alternative materials ie. carbon fiber, aluminum, steel. Two-piece driveshafts may
be replaced with one-piece units. If non-OEM driveshaft is used, add 25 lbs."
T4 GCR ERROR - letter not properly applied to GCR
#35999 from Touring Committee · Rule change · TB 24-05 (2024-05 Fastrack)
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Notes as follows:
"Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must remainstock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from moving
action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including
Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r) sway bars
allowed. Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs #0000-04-9700-08, rear springs #0000-04-9400-07, helper springs #0000-04-HLPR-EB (optional). Up to 500lb front and 300lb rear
springs allowed. Mazda Motorsports Header part #0000-06-5410 allowed. Mazda tower brace 0000-04-5626 allowed."
AS Request for Classification of 2018-2023 mustang In
#35764 from Michael Kamalian · Rule change · TB 24-06 (2024-06 Fastrack)
addedAS adds 2018-23 Ford Mustang GT 5.0L at 3600 lbs, 275 tire, 60mm restrictor, optional Brembo front brakes.As printed in Fastrack
AS Spec Lines, classify Ford Mustang GT 5.0L (2018-) as follows:
AS Wheelbase Gear Ratios
A specification table follows in the original; it is not shown here.
FP NIssan 300ZX Z31 to EP
#35830 from Murphy Nichols · Rule change · TB 24-06 (2024-06 Fastrack)
addedNissan 300ZX 84–89 added to EP, 2550–2678 lbs, 2960 cc SOHC, fuel injection, 12.0:1 compression, 0.500" valve lift limit.As printed in Fastrack
In EP Spec Lines, classify Nissan 300ZX (84-89), as follows:
A specification table follows in the original; it is not shown here.
T4 Allow OEM Front Spoiler 06-08 Miata in T4
#35941 from David Mead · Rule change · TB 24-06 (2024-06 Fastrack)
In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), add to Notes the following: "Front
spoiler permitted (NF51-V4-900F)."
Applies to Mazda MX-5 on this page: Marc Cefalo, Robert Spence, Kevin Fryer, Richard Mooney, Sergio Zlobin
FP RX7 1993 and Up Request In EP Spec Lines, classify
#36031 from Edward Zabinski · Rule change · TB 24-06 (2024-06 Fastrack)
addedMazda RX-7 92-97 added to EP Prep as Level 2 rotary 13B 6-port, 2200–2310 lbs, carb or fuel injection, 42 mm choke.As printed in Fastrack
Mazda RX-7 (92-97) as follows:
A specification table follows in the original; it is not shown here.
T4 T4 Mustang Weight Reduction In T4 Spec
#36051 from Scotty B White · Rule change · TB 24-06 (2024-06 Fastrack)
Lines, Ford Mustang V6 (05-10), change as follows:
Weight: "3275 3225"
Notes: "14” Brembo Brake Kit#M-2300-S permitted."
T4 R53 Mini Cooper S spec line request In
#36056 from Manvinder Singh · Rule change · TB 24-06 (2024-06 Fastrack)
T4 Spec Lines, Mini Cooper S (02-04), add to Notes the following:
"Milltek exhaust manifold #SSXM459 allowed. 25mm rear sway bar allowed."
T4 Spec Lines, Mini Cooper S (05-06), add to Notes the following:
"Milltek exhaust manifold #SSXM459 allowed. 25mm rear sway bar allowed."
FP Clean-up Multiple EP RX-8 Spec Lines In EP
#36156 from Production Committee · Rule change · TB 24-06 (2024-06 Fastrack)
removed · cars addedEP Mazda RX-8 (04-11) alternate spec line removed; single spec line retained.As printed in Fastrack
Spec Lines, make the following changes to the two Mazda RX-8 spec lines.
Remove spec line entirely:Mazda RX-8 (04-11)
Remove the wording "alternate":
Mazda RX-8 (04-11)(alternate)
Spec Mazda (SM/SMX) None.
T4 Mustang T2/T3
#35877 from Scotty B White · Rule change · TB 24-07 (2024-07 Fastrack)
addedT2 Mustang GT 5.0L 15-17 and 2018- now permit Track/Performance Package parts; T3 V6 15-17 clarified to allow Track/Performance package.As printed in Fastrack
In T2 Spec Lines, Ford Mustang GT 5.0L (15-17), add to Notes as follows:
"Track/Performance Package parts permitted."
In T2 Spec Lines, Ford Mustang GT 5.0L (2018-), add to Notes as follows:
"Track/Performance Package parts permitted."
In T3 Spec Lines, Ford Mustang V6 (15-17), change Notes as follows:
"Track/Performance package allowed."
T4 Homologation of car to T4
#36030 from Patrick E Morgan · Rule change · TB 24-07 (2024-07 Fastrack)
In T4 Spec Lines, Mercedes C300 4Matic (2008-2011), classify as follows:
A specification table follows in the original; it is not shown here.
T4 T2-T4 Driveshaft Mistake...?
#36050 from Scotty B White · Rule change · TB 24-07 (2024-07 Fastrack)
faster · weightT2-T4 Ford Mustangs: remove 25 lb penalty for non-OEM driveshaft, clarify alternate driveshaft allowance.As printed in Fastrack
In GCR Section 9.1.9.2.D.4.b.6., remove as follows:
"If non-OEM driveshaft is used, add 25 lbs."
In T2 Spec Lines, Ford Mustang V6 (11-14), change Notes as follows:
"Driveshaft from Alternate metallic driveshaft is allowed."
In T2 Spec Lines, Ford Mustang Boss 302 (12-13), change Notes as follows:
"Alternate metallic driveshaft is allowed."
In T2 Spec Lines, Ford Mustang GT 5.0L (11-14)ki, change Notes as follows:
"Alternate metallic driveshaft is allowed."
In T2 Spec Lines, Ford Mustang GT 5.0L (15-17), change Notes as follows:
"Alternate metallic driveshaft is allowed."
In T2 Spec Lines, Ford Mustang GT 5.0L (2018-), change Notes as follows:
"Alternate metallic driveshaft is allowed."
In T2 Spec Lines, Ford Mustang Coupe GT & Shelby GT 4.6L (05-10), change Notes as follows:
'An Aluminum driveshaft is allowed."
"Alternate metallic driveshaft is allowed."
In T3 Spec Lines, Ford Mustang Coupe GT & Shelby GT 4.6L & Cal. Special (05-10), change Notes as follows:
"An Aluminum driveshaft is allowed."
"Alternate metallic driveshaft is allowed."
In T3 Spec Lines, Ford Mustang V6 (11-14), change Notes as follows:
"Driveshaft from Alternate metallic driveshaft is allowed."
T4 MINI Cooper S Spec Lines Corrections.
#36086 from David Oliveira · Rule change · TB 24-07 (2024-07 Fastrack)
In T4 Spec Lines, Mini Cooper S (02-04), delete spec line in its entirety.
In T4 Spec Lines, Mini Cooper S (05-06), change Model as follows:
"Mini Cooper S R53 (0205-06)"
In T4 Spec Lines, Mini Cooper S (07-13), change Model and Notes as follows:
"Mini Cooper S R56 (07-13)"
Notes: "The following items must remain stock: shock/struts (including mounts), original wheels, and transmissiondifferential - unless specified below. Convertible model not allowed. Factory optional limited slip differential allowed.JCW struts (F) 31 31 6 768 410 (R)33 52 6 768 412, springs (F)31 33 6 768 415 (R)33 53 6 768 418. May de-camber
Show 8 more lines
wheels by the use of slotted adjusters at the top of the strut mounting plates. They shall be located on the existingchassis structure, utilizing the manufacturers original bolt holes and may not serve as reinforcement for thatstructure. Any spring up to a maximum spring rate of 500 lbs. front and 800 lbs. rear may be used. Wheels conforming
to B-spec rules are permitted."
In T4 Spec Lines, Mini Cooper S (2016-), change Model and add to Notes as follows:
"Mini Cooper S (20142016-2023)"
Notes: "Convertible model not allowed. Any spring up to a maximum spring rate of 500lbs. front and 800lbs. rear may
be used."
T4 Allow Removal of Sound Tubes
#36130 from Coyote Black · Rule change · TB 24-07 (2024-07 Fastrack)
In GCR Section 9.1.9.2.D.1.b., add the following:
"2. OEM intake- Chambers, resonators and acoustic devices may be removed, provided; that their ports are located
prior to any required restrictor, their ports are completely sealed, and that the part serves no other purpose."
T4 B8/8.5 Audi S4 T3 and T2
#36195 from Brian Leib · Rule change · TB 24-07 (2024-07 Fastrack)
addedAudi S4 (2000–2002) classified in T3 with 2671cc, 3400 lbs minimum weight, 38mm restrictor, allowing 800lb springs and intercooler.As printed in Fastrack
In T3 Spec Lines, Classify Audi S4 (2000-2002) as follows and allow the T2 spec line to expire.
A specification table follows in the original; it is not shown here.
FP Errant entry in HP production line item
#36231 from Angus Crome · Rule change · TB 24-08 (2024-08 Fastrack)
wordingHP Volkswagen Golf and Jetta 85-92 track correction: front 1537 mm (60.5 in.), rear 1529 mm (60.2 in.).As printed in Fastrack
In HP Spec Lines, change Track (F/R)mm/(in.) as follows:
Volkswagen Golf (GTI, GT, GL) (85-92): "2 1537/1529 (60.5/60.2)"
Volkswagen Jetta (GLI, GL) (85-92): "2 1537/1529 (60.5/60.2)"
T4 T4 Camaro V6 weight reduction
#36232 from Ted Warning · Rule change · TB 24-08 (2024-08 Fastrack)
In T4 Spec Lines, Chevrolet Camaro V-6 (96-02), change weight as follows:"3250 3150"
T4 BOP adjustment for ND MX5s
#36345 from Touring Committee · Rule change · TB 24-08 (2024-08 Fastrack)
In T4 Spec Lines, change Weight (lbs) as follows:
Mazda MX-5 Miata/Club (16-18): "2700 2650"
Mazda MX5 Miata/Club/ RF (19-24): "2800 2750"
SRF Update Rain Tire Rule and Hoosier Decal Placement
#36436 from Robey Clark · Rule change · TB 24-08 (2024-08 Fastrack)
tyres & wheelsSRF wet tyres: front P185/60R13 H20 or W2 and rear P205/60R13 H20 or W2 removed; front P185/65R13 W2 and rear P205/60R13 W2 now required. Hoosier decal placement specified.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Wet:Front – Hoosier P/N 46100 P185/60R13 H20 or W2Rear – Hoosier P/N 46105 P205/60R13 H20 or W2Ground clearance is 2.5” with driver as raced when P185/60R13 (H20 or W2) tires are used.OR
Front – Hoosier P/N 46101 P185/65R13 W2
Rear – Hoosier P/N 46105 P205/60R13 W2
1. It is forbidden to regroove tires.
2. The use of tire warmers or cooling methods other than natural air convection or conduction is prohibited. The penalty for
violation will be the loss of qualifying times and/or the disqualification of race results.
3. Hoosier SRF/SRF3 Decal Placement:
Four (4) "Hoosier" decals are required in the following locations: Two (2) 11" X 3" decals on the vertical plane of the front nose to
the outside of the cooling opening on each side and two (2) 18" X 5" decals, one on each side of the engine cover or above the
rear wheel openings on the vertical plane. Hoosier decals are available, free of charge, from all Hoosier tire distributors including
SCCA Enterprises."
SRF Protest Fee Clarification
#36540 from SCCA Staff · Rule change · TB 24-09 (2024-09 Fastrack)
wordingFE and SRF protest fee rules redirected to GCR section 8.3.1.D for fees and procedure.As printed in Fastrack
In FE, GCR section 9.1.1.I.2.U.b.3, change as follows:
"Protest Fee: Regional -$25.00, National -$50.00. See GCR section 8.3.1.D for fees and payment procedure."
In SRF, GCR section 9.1.8.D.1.U.b.3, change as follows:
"Protest Fee: Regional -$25.00, National -$50.00. See GCR section 8.3.1.D for fees and payment procedure. Item 1 will be done by
the CSR or other shop that is equipped for this type of work and will be paid directly."
SRF Update to Letter 36619 with new Hoosier Contingency Decal Info
#36624 from Robey Clark · Rule change · TB 24-09 (2024-09 Fastrack)
wordingSRF Hoosier contingency decal requirement reduced from four decals in specific locations to three decals with simplified placement.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.f.3, change as follows:
"Four (4) "Hoosier" decals are required in the following locations: Two (2) 11" X 3" decals on the vertical plane of the front noseto the outside of the cooling opening on each side and two (2) 18" X 5" decals, one on each side of the engine cover or above therear wheel openings on the vertical plane. Hoosier decals are available, free of charge, from all Hoosier tire distributors includingSCCA Enterprises Per Hoosier's contingency program, three (3) decals are required to qualify for contingency awards. One (1)
decal must be located on each side of the car and one (1) decal must be visible on the front."
AS Mustang transmission ratios
#36662 from American Sedan Committee · Rule change · TB 24-09 (2024-09 Fastrack)
addedAS Mustang GT 05-14 Restricted Prep and 2018- gain alternate transmission ratio options.As printed in Fastrack
In AS Spec Lines, Ford Mustang GT (05-14) with Restricted Prep Engine, add to Notes as follows:
"Alternate transmission Ratios 3.66, 2.43, 1.69, 1.32, 1.00, .68.”
In AS Spec Lines, Ford Mustang GT 5.0L (2018-), add to Notes as follows:
"Alternate transmission Ratios 3.24, 2.10, 1.42, 1.00, 0.81, .062."
Applies to Ford Mustang on this page: Michael Kamalian, Gregory Eaton, James Jost
SRF Update SRF3 Air Filter Rule
#36681 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)
removedSRF3 air filter rule removes K&N RC-9160 option, specifies Weems P/N WM301020 only.As printed in Fastrack
In SRF, GCR section 9.1.8.D.2.H.23, change as follows:
"Air Filter: P/N WM301020 or K&N RC-9160"
SRF Update SRF Brake Rotor Thickness
#36687 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)
suspension & brakesSRF Wilwood vented rotor minimum thickness increases to 13.25mm, 0.522 inches.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.g, change as follows:
"Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 shall must be used as delivered with
no machining of any kind. Minimum thickness 12.20mm (0.481”) 13.25mm (0.522”)."
FP Errors/emissions Honda Civic/CRX
#36700 from Martin Burk · Rule change · TB 24-10 (2024-10 Fastrack)
faster · engineFP Honda CRX/CRX Si 84-87 block material changes from iron to aluminium.As printed in Fastrack
In FP Spec Lines, Honda CRX / CRX Si (84-87), change Block Mat'l as follows:
"Iron Alum"
SRF Hoosier Tire Decal Placement
#36739 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)
wordingSRF3 Hoosier decal placement changed from four logos on nose and tail to three logos on sides and center front.As printed in Fastrack
In SRF, GCR section 9.1.8.D.2.B, change as follows:
"Mandatory identification: "SRF3" near the side car numbers. "Hoosier" logo (4) on both sides front lower outer corners of thenose and each side of the tail. Three (3) "Hoosier" logos, one (1) on each side of the car and one (1) on the center front of the car."
FP 1275 HP Spridget Level 2 Only
#36518 from Darryl Saylor · Rule change · TB 24-09 (2024-09 Fastrack)
faster · engineHP 1275 Spridget compression ratio raised to 12.0:1; 1098cc also raised to 12.0:1.As printed in Fastrack
In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1275cc, change Notes as follows:
"(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"
In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1098cc, change Notes as follows:
"(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"
T4 Bop Request 06-11 Honda Civic Si
#37013 from Mathew Milford · Rule change · TB 24-11 (2024-11 Fastrack)
In T4 Spec Lines, Honda Civic Si (06-11), add to Notes the following:
"LSD is permitted according to category rules."
T4 Redundant Verbiage Regarding Mustang Spec Lines for Driveshaft
#36484 from David Mead · Rule change · TB 24-12 (2024-12 Fastrack)
wordingT2, T3 Mustang spec lines remove redundant driveshaft allowance notes across six model year ranges.As printed in Fastrack
In T2 Spec Lines, change Notes as follows:
Ford Mustang V6 (11-14): "Alternate driveshaft is allowed."
Ford Mustang Boss 302 (12-13): "Alternate driveshaft is allowed."
Ford Mustang GT 5.0L (11-14): "Alternate driveshaft is allowed."
Ford Mustang GT 5.0L (15-17): "Alternate driveshaft is allowed."
Ford Mustang GT 5.0L (2018-): "Alternate driveshaft is allowed. Springs up to 800#/in front and rear permitted. Alternatemetallic driveshaft permitted."
Ford Mustang Coupe GT & Shelby GT 4.6L (05-10): "Alternate driveshaft is allowed."
In T3 Spec Lines, change Notes as follows:
Ford Mustang Coupe GT & Shelby GT 4.6L & Cal. Special (05-10): "Alternate driveshaft is allowed."
Ford Mustang V6 (11-14): "Alternate driveshaft is allowed."
Ford Mustang V6 (05-10): "An Aluminum driveshaft is allowed."
T4 R53 Mini Cooper S Weight Reduction Request
#36612 from Manvinder Singh · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, Mini Cooper S R53 (02-06), add to Notes as follows:
"Alta 15% Pulley #AMPENG20X allowed."
T4 Allowable Wheel Offset
#36855 from Robert Maples · Rule change · TB 24-12 (2024-12 Fastrack)
In GCR Section 9.1.9.2.D.7. Wheels and Tires, change as follows:
"a. Wheels
1. Any type wheel suitable for competition may be used, provided:
a. Any wheel not exceeding the specified diameter and rim width on the vehicle’s specification line may be used. Each wheel,
measured without weights, must weigh at least 15 lbs.
b. Wheels are permitted any offset provided the tire tread (that portion of the tire that contacts the ground) does not protrude
beyond the fender opening when viewed from 9.1.9.2.Touring (T2-T4) Category Specifications GCR - 660 the top perpendicular
to the ground, unless specified differently on the individual spec line for that car. To determine compliance the vehicle should be
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rolled through a powdered substance, as raced with driver, in order to indicate the tire tread contact patch under static
conditions. When a maximum tire size is listed on a vehicle’s specification line, aspect ratio is open and any tire may be used that
does not exceed the stated maximum section width.
c. Cars equipped with lug bolts may convert to wheel studs and lug nuts.
d. Wheel studs may be replaced with longer studs as necessary to fit optional wheels. Wheel spacers may be used for purposes
of adjusting track.e-T4 only: (unless specified on spec line) Any aftermarket wheel with a minimum weight of 15 lbs allowed."
T4 Fuel Emissions Components
#37076 from Derrick Ambrose · Rule change · TB 24-12 (2024-12 Fastrack)
addedT2, T3, T4 fuel cell installations may omit charcoal canisters, emissions valves, and sensors.As printed in Fastrack
In GCR, Section 9.1.9.2.D.1.c. add the following:
"5. Removal of ancillary fuel tank equipment charcoal canisters, emissions valves, and sensors allowed for OEM or aftermarket
fuel cell installations."
T4 2019-2024 Mazda 3 for T4
#37077 from Derrick Ambrose · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, classify Mazda 3 (19-24), as follows:
A specification table follows in the original; it is not shown here.
Applies to Mazda NC on this page: Ayden Rose
T4 fix brake wording
#37129 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)
wordingT2, T3, T4 brake specifications clarified: 2-piece rotors allowed in T2 within 5% OE diameter, T3 within 2% OEM diameter.As printed in Fastrack
In GCR, Section, 9.1.9.2.D.6. Brakes, change as follows:
"a. Components
1. The make and material of brake pads and linings may be changed.
2. Brake fluid may be substituted with any brake fluid.
3. Brake rotor dust shields may be removed or replaced to accommodate brake ducts.
4. Flexible rubber brake lines may be replaced with Teflon lined, metal braided hoses.
5. Any brake ducts are permitted, but they must serve no other purpose. Fender liners may be modified solely for routing and
attachment of brake ducts. Duct intake openings may be created by the opening of 2 sections up to 14.5 square inches each in
the front fascia. The stock headlamp location is not permitted for brake ducting. Two alternative duct openings may be created
by the removal of the fog lights or 2 sections up to 14.5 square inches each of stock false grills originally located in the front
fascia.
6. Stock replacement brake rotors may be obtained from sources other than the manufacturer provided they are the exact
equivalent of the stock rotors. In T2 only - 2-piece rotors with ferrous metal rotor disks and aluminum hats are allowed, must be
within 5% of OE diameter. In T3 only - 2-piece front rotors with ferrous metal rotor disks and aluminum hats are allowed, must
be within 2% of OEM diameter. Drilled and slotted rotors are permitted.
7. Parking brakes, mechanisms, and actuating components may be removed.
8. Brake vacuum reservoirs sized 0.50 gallons or smaller are permitted. The port or fitting at the vacuum source may not be
modified, enlarged or relocated. The vacuum reservoir and brake booster must be a closed system."
T4 Evaporative emissions systems
#37130 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)
addedT2, T3, T4 fuel cell installations may remove charcoal canisters, emissions valves, and sensors.As printed in Fastrack
In GCR, Section, 9.1.9.2.D.1.c., add the following:
"5. Removal of ancillary fuel tank equipment; charcoal canisters, emissions valves, and sensors allowed for OEM or aftermarket
fuel cell installations."
T4 Allow Spec MX5 upgrade kit for 2009-11 RX8 S2 Transmision
#37140 from Chris Braunlich · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, add the following to Notes:
Mazda RX-8 Base/R3/Sport/ GT (04-12): "Transmission kit # 0000-02-5700 permitted.
Mazda MX-5 / Club Model (06-15): "Transmission kit # 0000-02-5700 permitted."
In T3 Spec Lines, add the following to Notes:
Mazda MX-5 / Club Model (06-15): "Transmission kit # 0000-02-5700 permitted."
Mazda RX-8 Base/R3/Sport/ GT (04-12): "Transmission kit # 0000-02-5700 permitted."
T4 Move Spec Boxster to T4
#37158 from Rob Piekarczyk · Rule change · TB 24-12 (2024-12 Fastrack)
addedPorsche Spec Boxster moves to T4, minimum weight 2750 lbs, ineligible for Runoffs until 3 Super Tour events.As printed in Fastrack
In T4 Spec Lines, classify Porsche Spec Boxster, as follows:
A specification table follows in the original; it is not shown here.
T4 3.7 Mustangs to T4
#37188 from Scotty B White · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, classify Ford Mustang V6 (05-14), as follows:
A specification table follows in the original; it is not shown here.
Applies to Ford Mustang on this page: Scotty B White, Paolo Salvatore
T4 BMW 320i Spec Line
#37204 from chi ho · Rule change · TB 24-12 (2024-12 Fastrack)
added · engineT4 BMW 320i Spec Line: Turner Motorsports intercooler #024703TMS02 now allowed.As printed in Fastrack
In T4 Spec Lines, BMW 320i (14-15), change Notes as follows:
"**This Spec line will expire 12/31/24, Please submit to appeal** Turner Motorsports intercooler #024703TMS02 allowed."
T4 MX5 2006-2015 NC Help
#37221 from Richard Mooney · Rule change · TB 24-12 (2024-12 Fastrack)
Thank you for your letter. Please see changes in letter #37281 in current Fastrack.
T4 Classification for a 2005 Cadillac CTS 3.6 liter 6 speed manual
#37224 from Timothy Nash · Rule change · TB 24-12 (2024-12 Fastrack)
added2005 Cadillac CTS 3.6L 6-speed manual classified in T3 Spec.As printed in Fastrack
In T3 Spec Lines, classify Cadillac CTS (02-07) as follows:
T4 Civic SI in T4
#37248 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, Honda Civic Si (06-11), change as follows:
Required Restrictor: "55mm flat plate restrictor required."
Min Weight: "2950 2900"
Notes: "The following items must remain stock: transmission differential - unless specified below. 55mm flat plate restrictorrequired. LSD IS PERMITTED ACCORDING TO CATEGORY RULES"
T4 2006-2015 T4 NC Mx5 spec line
#37278 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), change Notes as follows:
"Factory bolt-in roll bar/cross member may be removed to facilitate roll cage installation. MSR option permitted. Suspension
package permitted with a 100 lbs. weight increase that includes the following parts: front spring mount PT#-0000-04-5259, front
springs #0000-04-9700-08, rear spring mount PT#-0000-04-5258, rear springs #0000-04-9400-07, helper springs #0000-04-HLPR-
EB (optional), Swaybar kit – PT#-0000-04-5306-EB that includes (front sway bar kit PT#0000-04- 5306-FT, rear sway bar kit PT#-
0000-04-5306-RR), offset front camber bushing PT#-0000-04- 5407-NC. Mazda Motorsports cold air intake part #0000-06-5150-
KT allowed. Mazda Motorsport RX8 rear Hub Conversion kit part number 0000-04-5811-KT allowed, RX8 front hubs PT# F189-33-
04X allowed. The SM5 suspension (only) is allowed with a 100 lbs. weight increase. Allow Mazda header part numbers 0000-06-
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5407 or 0000-06-5407-NC. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including Mazda
hardtop and part #0000-07-5901- CC. Aftermarket power steering reservoir is allowed. Mazda Transmission kit part # 0000-02-
5700. Mazda Motorsports LSD #3265 5 0000-02-5564 permitted without penalty. Any other non-OEM limited slip differential
allowed with +50 lbs. weight penalty. Front spoiler permitted (NF51-V4-900F)."
Applies to Mazda MX-5 on this page: Marc Cefalo, Robert Spence, Kevin Fryer, Richard Mooney, Sergio Zlobin
T4 ND MX-5 wheel allowance
#37279 from Josh Smith · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Wheel Size as follows:
"17 x 7.5"
T4 T4 BOP
#37281 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change as follows:
Required Restrictor: "60mm 59mm"
Weight: "3125 3200"
In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), change weight as follows:
"2600 2550"
Applies to Mazda RX-8 on this page: Marc Cefalo
Applies to Mazda MX-5 on this page: Marc Cefalo, Robert Spence, Kevin Fryer, Richard Mooney, Sergio Zlobin
T4 Allow 7.5
#37286 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), change Wheel Size as follows:
"17 x 7.5"
AS Increase Coyote Engine Restrictor to 80mm
#36177 from Gregory Eaton · Rule change · TB 25-01 (2025-01 Fastrack)
faster · engineAS Ford Mustang and Cobra Coyote engine restrictor increases to 80mm from 67mm or 64mm.As printed in Fastrack
In AS Spec Lines, add to Notes as follows:
Ford mustang (GT 05-14): "Gen 1- 67mm Gen 2-64mm"
Ford mustang (GT 05-14): "Gen 1- 67mm"
Ford mustang (GT 15-17): "Gen 1- 67mm"
Ford mustang (GT 94-04): "Gen 1- 67mm Gen 2-64mm"
Ford mustang cobra & Cobra R Mercury Capri (79-93) (79-86): "Gen 1- 67mm Gen 2-64mm"
AS Performance Pack for 2015+ Mustang
#36867 from Michael Kamalian · Rule change · TB 25-01 (2025-01 Fastrack)
faster · engineAS Mustang GT 05-14 Restricted loses 300 lbs engine; 15-17 and 2018+ models lose 61mm and 60mm restrictors respectively.As printed in Fastrack
In AS Spec Lines, Ford Mustang Coupe GT (05-14) Restricted Prep., change Notes as follows:
"The 4.6L engine assembly has a weight reduction of 300 lbs. 5.0L/6spd engine/trans: track pack front and rear spoiler allowed."
In AS Spec Lines, Ford Mustang Coupe GT (05-14) with Restricted Prep. engine, change Notes as follows:
"Max. Wheel Size: Dia.18.0 inches. Stock brakes or alternate Ford 14” Brembo Brake (Ford Racing Kit #M-2300-S) and full prep
brake package may be used. Either engine may be used. 1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0lCoyote 15-17 61mm FPR Cold Air Intake allowed Charge Motion Control Valves can be blocked off and removed for firewall
clearance Allow Cold Air Intake Tremec Magnum transmission may be used P/N- TUKT16901. Full Prep Transmissions rule
package may also be used. Max compression ratio, 11.2:1 track pack front and rear spoiler allowed. Alternate transmission
Ratios 3.66, 2.43, 1.69, 1.32, 1.00, .68."
In AS Spec Lines, Ford Mustang GT 5.0l (15-17) Restricted Preparation, change Notes as follows:
"Max. Wheel Size: Dia. 18.0 inches. Stock brakes or alternate Ford Brembo Brake caliper (Ford Racing Kit #M-2300-S) may be
used. 61mm flat plate restrictor required. Fuel cells must be located within 24 inches of the standard tank. The 24 inchmeasurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installationof a safety fuel cell. 11” wide wheels can be used until 3/1/25. Performance pack front and rear spoiler, body kit allowed."
In AS Spec Lines, Ford Mustang GT 5.0L (2018-), change Notes as follows:
"Package Brembo front BBK and 380mm rotors permitted (Ford PN M-2300-V) at no weight penalty. 60mm flat plate restrictorrequired. 2014 Mustang GT exhaust manifolds permitted. Ford Racing oil pan #M-6675-M50BR permitted. Alternatetransmission Ratios 3.24, 2.10, 1.42, 1.00, 0.81, .062. Performance pack front and rear spoiler, body kit allowed."
Applies to Ford Mustang on this page: Michael Kamalian, Gregory Eaton, James Jost
T4 2016-2018 Mazda Miata MX5
#37085 from Nic Piekarski · Rule change · TB 25-01 (2025-01 Fastrack)
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Min Weight as follows:
"2650 2575"
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), add to Notes the following:
"Mazda header 0000-06-5410 allowed."
FP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line
#37119 from Tim Schreyer · Rule change · TB 25-01 (2025-01 Fastrack)
faster · weightEP BMW 325i/is E30 84-91 weight reduced to 2150 lbs base, 2204 lbs with turbo, 2258 lbs supercharged.As printed in Fastrack
In EP SPEC LINES, BMW 325i/is (E30) (84-91), change Weight as follows:
"2200 2150
*2255 2204
**2310 2258"
AS Gear Ratios
#37131 from Timothy White · Rule change · TB 25-01 (2025-01 Fastrack)
addedAS class: multiple American muscle cars gain additional allowed gear ratio options across model years and prep levels.As printed in Fastrack
In AS Spec Lines, change Gear Ratios as follows:
Cadillac CTS-V (04-07):
"2.97, 2.07, 1.43,1.00, 0.84,0.56 or 3.01, 2.07, 1.43, 1.0, .84, .57 or 2.20, 1.64,1.28,1.00 or 2.88, 1.91, 1.33, 1.00"
Chevrolet Camaro, Pontiac Firebird (70-81), Full Prep:
"3.42, 2.28, 1.45, 1.00 or 2.95, 1.94, 1.34, 1.00, 0.73 or 3.35, 1.93, 1.29, 1.00, 0.61, or 2.20, 1.64,1.28,1.00 or 2.87,1.89,1.28,1.00"
Chevrolet Camaro, Pontiac Firebird (70-81), Restricted Prep.:
"3.42, 2.28, 1.45, 1.00 or 2.95, 1.94, 1.34, 1.00, 0.73 or 3.35, 1.93, 1.29, 1.00, 0.61, or 2.20, 1.64,1.28,1.00 or 2.87,1.89,1.28,1.00"
Chevrolet/Pontiac Camaro & Firebird (82-92) Full Prep:
"3.42, 2.28, 1.45, 1.00 or 2.95, 1.94, 1.34, 1.00, 0.73 or 3.35, 1.93, 1.29, 1.00, 0.61 or 2.20, 1.64,1.28,1.00 or 2.88, 1.91, 1.33,
1.00"
Chevrolet/Pontiac Camaro & Firebird (93-02) Full Prep:
"3.42, 2.28, 1.45,1.00 or 2.95, 1.94,1.34, 1.00,0.73or 3.35, 1.93,1.29, 1.00,0. 61 or 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00,
0.68 or 2.20,1.64,1.28,1.00 or 2.87,1.89,1.28,1.00,.81"
Chevrolet/Pontiac Camaro & Firebird (93-02) Restricted prep:
"2.97, 2.07, 1.43, 1.00, 0.80, 0.62 or 3.36, 2.07, 1.35, 1.00, .80, .62 or 2.66, 1.78, 1.30, 1.00, 0.74, 0.50 or 2.88, 1.91, 1.33, 1.00 or
2.20, 1.64,1.28,1.00"
Chevrolet Camaro SS (V8) (10-15) Restricted Prep:
"3.01, 2.07, 1.43, 1.0, .84, .57 or 2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
Chevrolet Camaro (10-15) Full Prep:
"3.42, 2.28, 1.45,1.00 or 2.95, 1.94,1.34, 1.00, 0.73or 3.35, 1.93,1.29, 1.00,0. 61 or 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00,
0.68 or 2.20, 1.64,1.28,1.00 or 2.87,1.89,1.28,1.00,.81"
Chevrolet Camaro (16-) Full Prep:
"3.42, 2.28, 1.45,1.00 or 2.95, 1.94,1.34, 1.00, 0.73or 3.35, 1.93,1.29, 1.00,0. 61 or 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00,
0.68 or 2.20, 1.64,1.28,1.00 or 2.87,1.89,1.28,1.00,.81"
Chevrolet Camaro, 1LE (16-):
"2.66,1.78,1.30, 0.74,.50 or 2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00 or 2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
Dodge Challenger (08-20) Restricted Preparation 5.7L, 6.1L, or 6.4L V8 (Iron block, Aluminum heads), 2 valves/cylinder:
"2.97, 2.1, 1.46, 1.00, 0.74, 0.50 or 2.26, 1.58, 1.19, 1.00, 0.77, 0.63 or 2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
Ford Mustang Incl. Cobra & Cobra R (79-93) and Mercury Capri (79-86) Full Prep:
"3.07, 1.72, 1.00, 0.70 or 2.95, 1.94, 1.34, 1.00, 0.63 or 3.35, 1.99, 1.33, 1.00, 0.68 or 2.87 1.89 1.28 1.00 0.81"
Ford Mustang Incl. Cobra & Cobra R (79-93) and Mercury Capri (79-86) with Restricted Prep Engine:
"2.95, 1.94, 1.34,1.00, 0.63 or 3.35,1.99,1.33, 1.00, 0.69 or 2.88, 1.91, 1.33, 1.00 or 3.27,1.98, 1.34, 1.00, 0.68, 3.66, 2.43, 1.69,
1.32, 1.00, .68. or 2.87,1.89,1.28,1.00,.81"
Ford Mustang Including Cobra 94-04 Full Prep:
"3.07, 1.72, 1.00, 0.70 or 2.95, 1.94, 1.34, 1.00, 0.63 or 3.35, 1.99, 1.33, 1.00, 0.68 or 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34,
1.00, 0.68 or 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 or 2.20, 1.64,1.28,1.00 or 2.87 1.89 1.28 1.00 0.81"
Ford Mustang Cobra and GT 94-95 (Restricted Prep):
"3.35, 1.99, 1.33, 1.00, 0.68 or 2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
Ford Mustang including Cobra 96-04 (Restricted Prep) 4.6L two and four valve motor:
"3.35, 1.99, 1.33, 1.00, 0.68 or 3.27, 1.98, 1.34, 1.00, 0.67 or 3.37, 1.99, 1.33, 1.00, 0.68 or 3.38, 2.00, 1.32, 1.00, 0.68 or 2.88,
1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
Ford Mustang GT (05-14) Full Prep:
"3.38, 2.00, 1.32, 1.00, 0.68 or 3.66, 2.43, 1.69,1.32, 1.00, 0.65 or 2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
Ford Mustang GT 5.0l (15-17) Restricted Preparation:
"3.66, 2.43, 1.69,1.32, 1.00, .65 or 4.69, 2.98,2.14, 1.76,1.52, 1.27,1.00, 0.85, 0.68, 0.63, or 3.24, 2.10, 1.42, 1.00, 0.81, .062. or
2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
Ford Mustang GT 5.0L (2018-) Restricted Preparation:
"2.97, 2.07, 1.43, 1.00, 0.84, 0.57 or 2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
Pontiac GTO (04-06) Restricted Prep.
"2.97, 2.07, 1.43, 1.00, 0.84, 0.57 or 2.88, 1.91, 1.33, 1.00 or 2.20, 1.64,1.28,1.00"
AS ECU specs for LS engine
#37208 from Gary Mathews · Rule change · TB 25-01 (2025-01 Fastrack)
added · engineAS LS-engine cars gain ECU freedom: CTS-V, Camaro, Firebird (70–02) and Camaro SS may use any ECM.As printed in Fastrack
In AS SPEC LINES, Cadillac CTS-V (04-07) Restricted Prep., change Notes as follows:
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of the
stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Tremec TR6060
Transmission with 3.0 1, 2.07, 1.43, 1.0, .84, .57 ratios permitted. 11” wide wheels can be used until 3/1/25. Any ECM may be
used."
In AS SPEC LINES, Chevrolet Camaro, Pontiac Firebird (70-81) Restricted Prep ., add to Notes as follows:
"Any ECM may be used."
In AS SPEC LINES, Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V-8 LS1, add to Notes as follows:
"Any ECM may be used."
In AS SPEC LINES, Chevrolet/Pontiac Camaro & Firebird (93-02) Restricted Prep.5.7L V-8 LT1, add to Notes as follows:
"Any ECM may be used."
In AS SPEC LINES, Chevrolet/Pontiac Camaro & Firebird (93-02) Restricted Prep. 5.7L V-8 LT1; 98-02 , change Notes as follows:
"5.7L LS1:
GM Performance Parts camshaft Kit P/N-19355738 is permitted. Cylinder Bore, 99 mm; Stroke, 92 mm; Intake Valve Diameter,
50.8; Exhaust Valve Diameter, 39.4 mm; Throttle Body Bore, 75 mm; SLP Intake Lid (SLP part number 21044 (98-99) and 21045
(00-02)) is permitted.Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of thestock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell.
1-3/4 headers allowed. For the LS1connecting rods Callies P/NCSC6100DS6A2AH, Scat rods P/N2-1CR6100-944, GM performance
rods P/N12649190. Any ECM may be used."
In AS SPEC LINES, Chevrolet Camaro SS (V8) (10-15) Restricted Prep., add to Notes as follows:
"Any ECM may be used."
Applies to Chevrolet Camaro Z-28 on this page: Phillip Waters
T4 Remove spec lines that have expired
#37269 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)
removedT2, T3, T4: nine, nine, and thirty-seven expired spec lines removed effective 2025-01-01.As printed in Fastrack
In T2, Effective 1/1/2025, delete for following Spec Lines in their entirety:
"Acura TL SHAWD (10-13)Audi S4 (12-14)Audi S5 (13-14)Audi TT RS (2018-)Cadillac ATS-V (16-17)Cadillac CTS-V (06-07)Chevrolet Camaro SS (98-02)Honda Civic Type-R (2017-)Saturn Sky / Convertible (07-09)"
In T3, Effective 1/1/2025, delete for following Spec Lines in their entirety:
"Audi TTS Coupe (10-11)Cadillac ATS (2015)Chevrolet Cobalt (05-07)Dodge SRT-4 (03-05)Ford Fiesta ST (2014-)Hyundai Genesis Coupe (2010-)Hyundai Veloster Turbo (18-21)Mini Cooper S (2016-)Toyota Camry (11-15)"
In T4, Effective 1/1/2025, delete for following Spec Lines in their entirety:
"Acura Integra GS-R VTEC (3 or 4 door) (94-01)Audi A4 V-6 (96-01) / Volkswagen Passat 2.8 V6 (96-05)Chevrolet Cobalt SS, Sport Coupe (06-10)Chevrolet Sonic RS (2011-)Chrysler/Dodge Neon ACR SOHC (4 door) (01-02)Dodge Dart (14-15)Dodge/Plymouth Neon ACR SOHC/DOHC (2/4 door) (95-99)Fiat 500 Abarth (12-14)Ford Focus SVT (02.5-04)Ford Focus ZX4 ST (05-06)Ford Focus (08-11)Ford Mustang V-6 (01-04)Honda Accord LX & EX (03-07)Honda Accord LX-S/EX/EX-L (08-12)Honda Civic Coupe Si (99-00)Honda Civic SI (02-03)Hyundai Elantra GLS (11-12)Hyundai Tiburon V-6 (03-08)Hyundai Veloster Turbo/ R-Spec (14-15)Kia Forte Koup and Sedan LX/EX (10-13)Kia Forte Koup and Sedan SX (10-13Kia Forte Koup (14-15)Mazda Protégé ES (2000)Mazda Protégé 5 (02-03)Mazda6 s (03-07)Mitsubishi Eclipse GT (00-05)Nissan Sentra SER (02-03)Pontiac Firebird V-6 (96-02)Scion tC (03-07)Subaru Impreza (non-turbo) (04-06)Toyota Celica GT (00-05)Toyota Celica GTS/GT (00-05)Volkswagen Golf TDI (2010)Volkswagen Passat (12-14)Volkswgen Passat TDI (12-14)Volkswgen Passat 1.8T (2014-)"
FP Fix Error in Spridget Spec Line
#37437 from Jason Stine · Rule change · TB 25-01 (2025-01 Fastrack)
wordingFP Sprite and Midget 1275cc and 1500cc bore, stroke, displacement, and valve specifications corrected to factory dimensions.As printed in Fastrack
In FP SPEC LINES, Austin-Healey Sprite Mk. I, II,III, IV MG Midget Mk I,II, III, IV & 1500, change the following:
1275cc:
Bore x Stroke: "68.1x78.4 (2.68x3.09) 70.6x81.3 (2.78x3.20)"
Displacement: "(77.78) 1275"
Valves IN & EX: "(I) 32.1/(1.26) (E) 28.4/(1.12) (I) 33.3/(1.31) (E) 29.5/(1.16)"
1500cc:
Bore x Stroke: "1.1x84.3 73.7x87.4 (2.90x3.44)"
Displacement: "1491 (90.95) 1493"
Valves IN & EX: "(I) 36.6/(1.44) (E) 28.7 29.7/(1.17)"
FP Create ruleset that allows GTL cars to run in FP
#37485 from Club Racing Board · Rule change · TB 25-01 (2025-01 Fastrack)
addedF Production now permits GT-Lite cars meeting Appendix N specs to compete, governed by Appendix N not PCS 9.1.5.As printed in Fastrack
“(Effective January 1, 2026) (Effective January 1, 2025)." Any GT-Lite (GTL) car meeting all of the requirements of Appendix N
GT-LITE CATEGORY SPECIFICATIONS for inclusion into F PRODUCTION" may compete in the F-Production class. For GTL cars
competing in FP, the level of preparation and modifications will be determined by Appendix N and not by PCS 9.1.5.”
T4 Ford Mustang V6 (05-14)
#37516 from Touring Committee · Rule change · TB 25-02 (2025-02 Fastrack)
In T4 Spec Lines, Ford Mustang V6 (05-14), change as follows:
Final drive: "3.45"
Notes: "GT/CS front bumper cover #AR3Z-17D957-BA, allowed if used with front fascia."
Applies to Ford Mustang on this page: Scotty B White, Paolo Salvatore
T4 Request to Classify Club Spec in Appropriate Touring Classes
#37523 from Andrew Benagh · Rule change · TB 25-02 (2025-02 Fastrack)
addedFord SCCA Club Spec Mustang added to T3 at 3350 lbs; Mazda SCCA Club Spec MX-5 added to T4 at 2500 lbs.As printed in Fastrack
In T3 Spec Lines, classify Ford SCCA Club Spec Mustang (CSM) as follows:
A specification table follows in the original; it is not shown here.
Applies to Mazda MX-5 on this page: Marc Cefalo, Robert Spence, Kevin Fryer, Richard Mooney, Sergio Zlobin
FP Effective date for Jan 2025 GCR updates
#37654 from Doug Piner · Rule change · TB 25-02 (2025-02 Fastrack)
slower · inductionEP BMW models now require flat plate intake restrictors: Z3 2.5L 52mm, Z3 2.8L 55mm, 328i E36 58mm, 328i/ci E46 58mm, 325i E46 56mm, 325i E36 56mm, 325is M-Technic 56mm.As printed in Fastrack
In EP Spec Lines, add to Notes as follows:
BMW Z3 2.5LL "(Effective 2/21/2025) 52mm Flat Plate Intake Restrictor is required."
BMW Z3 2.8L (97-00): "(Effective 2/21/2025) 55mm Flat Plate Intake Restrictor is required."
BMW 328i/is E36 (96-99): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required."
BMW 328i/ci E46 (01-06): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required."
BMW 325i/is E46 (01-06): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
BMW 325i/is E-36 (92-95): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
BMW 325is M-Technic (1994): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
FP Request Competition Adjustment to BMW Z3 2.5L
#37120 from Tim Schreyer · Rule change · TB 25-01 (2025-01 Fastrack)
slower · inductionEP BMW Z3 2.5L, Z3 2.8L, 328i E36/E46, 325i E36/E46 intake restrictors reduced 4mm each, to 52–58mm.As printed in Fastrack
In EP Spec Lines, change Notes as follows:
BMW Z3 2.5LL "(Effective 3/1/2025) 56mm 52mm Flat Plate Intake Restrictor is required."
BMW Z3 2.8L (97-00): "(Effective 3/1/2025) 59mm 55mm Flat Plate Intake Restrictor is required."
BMW 328i/is E36 (96-99): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required."
BMW 328i/ci E46 (01-06): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required."
BMW 325i/is E46 (01-06): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
BMW 325i/is E-36 (92-95): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
BMW 325is M-Technic (1994): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
FP Interpretation of Production Rules on Mirrors
#37235 from Lawrence Slivinski · Rule change · TB 25-03 (2025-03 Fastrack)
addedEP, FP, HP may use any interior or exterior mirror meeting rule 9.3.36.As printed in Fastrack
In GCR, add new rule as Section 9.1.5.E.10.f:
"Any interior or exterior mirror(s) that meets rule 9.3.36 may be used."
FP FP Class Adjustments
#37458 from Production Committee · Rule change · TB 25-01 (2025-01 Fastrack)
slower · inductionFP Acura Integra and Honda Civic models restricted from 55mm to 51mm intake; Del Sol VTEC weight raised to 2290, 2347, 2405 lbs.As printed in Fastrack
In FP SPEC LINES, change Notes as follows:
Acura Integra (90-93): "(Effective 3/1/2025) 55mm 51mm Flat Plate Intake Restrictor is required."
Acura Integra LS (94-01): "(Effective 3/1/2025) 55mm 51mm Flat Plate Intake Restrictor is required."
Acura Integra GSR (92-93): "(Effective 3/1/2025) 55mm 51mm Flat Plate Intake Restrictor is required."
Honda Civic Si (99-00): "(Effective 3/1/2025) 55mm 51mm Flat Plate Intake Restrictor is required.
In FP SPEC LINES, change as follows:
Honda Civic Del Sol VTEC (94-97): "
Weight: "(Effective 3/1/2025) 2265 *2322 **2378 2290 *2347 **2405
Notes: "(Effective 3/1/2025) 55mm 51mm Flat Plate Intake Restrictor is required."
FP Weight Reduction for Honda S2000
#37466 from Michael Unger · Rule change · TB 25-03 (2025-03 Fastrack)
faster · weightEP Honda S2000 1997cc minimum weight drops 75 lbs to 2375; 2157cc drops 60 lbs to 2450.As printed in Fastrack
In EP, Spec Lines make the following weight changes:
A specification table follows in the original; it is not shown here.
FP Mazda 1999 Miata 1.8L
#37488 from Joe Carr · Rule change · TB 25-03 (2025-03 Fastrack)
faster · weightEP Mazda MX-5 Miata 99-05 minimum weight reduced to 2100 lbs, 2153 lbs with power, 2205 lbs modified.As printed in Fastrack
In EP Spec Lines, make the following weight change:
Mazda MX-5 /Miata (99-05):
"2150 2100
*2204 2153
**2258 2205"
FP Errors & Omissions
#37648 from Bryan Floyd · Rule change · TB 25-03 (2025-03 Fastrack)
addedFP Volkswagen Jetta Mark IV 4dr FWD added to GTL-FP Cars classification with 98.2 in wheelbase.As printed in Fastrack
In FP Spec Lines, Appendix N, GTL-FP Cars - Volkswagen, classify Jetta Mark - IV as follows:
GTL-FP Cars - VOLKSWAGEN
Model Years Body Style Drive-line Wheelbase (in) Notes
Jetta Mark - IV 4dr FWD 98.2
FP GTL/FP consolidation 2025 Rules
#37659 from James Gregorius · Rule change · TB 25-03 (2025-03 Fastrack)
added · inductionFP adds optional induction chokes as alternative to SIR, same size as listed restrictor.As printed in Fastrack
In FP Spec Lines, Appendix N: L.9, Fuel Injection System, add the following:
"As an option, induction system “Chokes” may be used where a SIR is required. Said chokes shall be fitted to each barrel of
carburetor/throttle body and all airflow into engine must pass through them. Choke size will be the same as listed SIR unless
noted."
AS Race memo
#37902 from American Sedan Committee · Rule change · TB 25-03 (2025-03 Fastrack)
wordingAS removes 'Any ECM maybe used' note from five Cadillac and Chevrolet/Pontiac V8 Restricted Prep models.As printed in Fastrack
In AS Spec Lines, change Notes as follows:
Cadillac CTS-V (04-07) Restricted Prep. 6.0L V8 (Aluminum block, Aluminum heads), LS2, 2 valves/cylinder:
"Any ECM maybe used."
Chevrolet Camaro, Pontiac Firebird (70-81) Restricted Prep. 6.2L V8 (Aluminum Block, Aluminum Heads), 2 valves per cylinder:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (82-92)s 5.7L V-8 LS1 (Aluminum Block, Aluminum Heads) 2 valves per cylinder:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (93-02):
"Any ECM maybe used."
Chevrolet Camaro SS (V8) (10-15) Restricted Prep. 6.2L V8 (Aluminum Block, Aluminum Heads), 2 valves per cylinder:
"Any ECM maybe used."
Super Tour Mar 2025 → Super Tour Mar 2026 2025-03-07 to 2026-03-06
AS Flotek Head Plunge Cut Inconsistencies
#37502 from Pamela Richardson · Rule change · TB 25-04 (2025-04 Fastrack)
wordingAS Flotek head value seat cutting dimensions figure updated for consistency.As printed in Fastrack
In GCR, Section 9.1.6., replace Figure 1 Value Seat Cutting Dimensions with the following:
AS Notes clean up
#37693 from American Sedan Committee · Rule change · TB 25-04 (2025-04 Fastrack)
wordingAS class notes cleaned: fuel cell and ECM specifications removed from multiple Camaro, Firebird, Challenger and Mustang variants.As printed in Fastrack
In AS Spec Lines, change/add to Notes as follows:
Cadillac CTS-V (04-07):
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of thestock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Any ECM maybe used. The
Drive Shaft Shop, Axle shaft part #'s 510220/510221 permitted."
Chevrolet Camaro, Pontiac Firebird (70-81) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: 14101081, 14014416 Port Volume (Max.): 081casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 250 lb. weight reduction. Edelbrock Cylinder Head Part#s 608979, 608879."
Chevrolet Camaro, Pontiac Firebird (70-81) Restricted Prep.:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (82-92) Full Prep.:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: 14101081, 14014416 Port Volume (Max.): 081cast¬ing: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 250 lb weight reduction. Edelbrock Cylinder Head Part#s 608979, 608879 are permitted. For regional competition only, unmodified GM Performance cylinder head part #s 19300955,19300956 may be used with Allstar restrictor plate part# ALL26180 and 1.250 inserts part# ALL26186 installed between intakemanifold and insulator. Gaskets may be used (each gasket can be no thicker than .125 inches), one on each side of the restrictor.All intake air must pass through the inserts of the restrictor plate. Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98,1.34, 1.00, 0.68 are permitted. Flo Tek Head part #102-500 are permitted."
Chevrolet/Pontiac Camaro & Firebird (82-92) Restricted prep engine:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (93-02) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #’s: 14101081, 14014416; Port Volume (Max.):081 casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 250 lb weight reduction. Edelbrock Cylinder HeadPart #’s 608979, 608879 are permitted. For regional competition only, unmodified GM Performance cylinder head part #s19300955, 19300956 may be used with Allstar restrictor plate part# ALL26180 and 1.250 inserts part# ALL26186 installedbetween intake manifold and insulator. Gaskets may be used (each gasket can be no thicker than .125 inches), one on each sideof the restrictor. All intake air must pass through the inserts of the restrictor plate. Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted. Fuel cells must be located within 24 inches of the standard tank. The 24 inchmeasurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted withinstallation of a safety fuel cell. Flo Tek Head part #102-500 are permitted."
Chevrolet/Pontiac Camaro & Firebird (93-02) Restricted Prep:
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of thestock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Any ECM maybe used."
Chevrolet Camaro SS (V8) (10-15) Restricted Prep:
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of thestock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Any ECM maybe used."
Chevrolet Camaro (10-15) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #’s: 14101081, 14014416; Port Volume (Max.):081 casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 200 lb weight reduction. Edelbrock Cylinder HeadPart #’s 608979, 608879 are permitted. Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 arepermitted. Fuel cells must be located within 24 inches of the standard tank. The 24-inch measurement is taken from theperimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Flo TekHead part #102-500 are permitted. Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement istaken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuelcell."
Chevrolet Camaro (16-) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #’s: 14101081, 14014416; Port Volume (Max.):081 casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 200 lb weight reduction. Edelbrock Cylinder HeadPart #’s 608979, 608879 are permitted, Flo Tek Head part #102-500 are permitted."
Chevrolet Camaro, 1LE (16-):
"60mm flat plate restrictor required. Any ECM maybe used."
Dodge Challenger (08-20) Restricted Preparation:
"80mm flat plate restrictor is required on the 6.4L engine. Fuel cells must be located within 24 inches of the standard tank. The24 inch measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted withinstallation of a safety fuel cell."
Ford Mustang Incl. Cobra & Cobra R (79-93) and Mercury Capri (79-86) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: F3ZE AA (GT40), F1ZE-AA (GT-40), F77E-AA(GT- 40P), Port Volume (Max.): 143.00cc IN/54.00cc EX (GT-40 & GT-40P) with a 250 lb weight reduction. Edelbrock CylinderHead Part #s 602579, 602479 are permitted. For regional competition only, unmodified Ford Performance cylinder head part #sM-6049-Z304DA7, M-6049-Z304D may be used with Allstar restrictor plate part# ALL26180 and 1.250 inserts part# ALL26186installed between intake manifold and insulator. Gaskets may be used (each gasket can be no thicker than .125 inches), one oneach side of the restrictor. All intake air must pass through the inserts of the restrictor plate. Alternate gear ratio sets 2.88, 1.91,1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted. Flo Tek Part # 203-500 are permitted."
Ford Mustang Incl. Cobra & Cobra R (79-93) and Mercury Capri(79-86) with Restricted Prep Engine:
"62mm flat plate restrictor is required. Fuel cells must be located within 24 inches of the standard tank. The 24 inchmeasurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted withinstallation of a safety fuel cell. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang Including Cobra 94-04 Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: F3ZE AA (GT40), F1ZE-AA (GT-40), F77E-AA(GT- 40P), Port Volume (Max.): 143.00cc IN/54.00cc EX (GT-40 & GT-40P) with a 250 lb weight reduction. Edelbrock CylinderHead Part #s 602579, 602479 are permitted. For regional competition only, unmodified Ford Performance cylinder head part #sM-6049-Z304DA7, M-6049-Z304D may be used with Allstar restrictor plate part# ALL26180 and 1.250 inserts part# ALL26186installed between intake manifold and insulator. Gaskets may be used (each gasket can be no thicker than .125 inches), one oneach side of the restrictor. All intake air must pass through the inserts of the restrictor plate. Alternate gear ratio sets 2.88, 1.91,1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted. Flo Tek Part # 203-500 are permitted."
Ford Mustang GT (94-04) with Restricted Prep Engine:
"MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang Cobra and GT 94-95(Restricted Prep):
"1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l Coyote 15-17 61mm FPR Alternate transmission Ratios 3.66,2.43, 1.69, 1.32, 1.00, .68. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang including Cobra 96-04 (Restricted Prep):
"1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l Coyote 15-17 61mm FPR Alternate transmission Ratios 3.66,2.43, 1.69, 1.32, 1.00, .68. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang Coupe GT (05-14) Restricted Prep.:
"1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l Coyote 15-17 61mm FPR Alternate transmission Ratios 3.66,2.43, 1.69, 1.32, 1.00, .68. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted. MT82 6 speed is permitted."
Ford Mustang GT (05-14) with Restricted Prep Engine:
"1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l Coyote 15-17 61mm FPR Alternate transmission Ratios 3.66,2.43, 1.69, 1.32, 1.00, .68. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted. MT82 6 speed is permitted."
Ford Mustang GT 5.0l (15-17) Restricted Preparation:
"61mm flat plate restrictor required. Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurementis taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safetyfuel cell. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
Ford Mustang GT 5.0L (2018-):
"60mm flat plate restrictor required. MMR Secondary Timing Chain Tensioner Bracket #467893 is permitted."
FP Request for Classification of Chevrolet Spark
#37755 from Kristian Smith · Rule change · TB 25-04 (2025-04 Fastrack)
addedChevrolet Spark 16-22 classified in HP Pre at 1850 lbs base, 1896 lbs modified, 1943 lbs.As printed in Fastrack
In HP Spec Lines, classify the Chevrolet Spark (16-22):
A specification table follows in the original; it is not shown here.
FP Request to Lower Ford Festiva Minimum Weight to 1600 LBS
#37939 from Doug DeRonne · Rule change · TB 25-04 (2025-04 Fastrack)
faster · weightHP Ford Festiva 88-93 minimum weight lowered to 1600 lbs, competition weight to 1640, prepared weight to 1680; compression ratio raised to 11.0:1.As printed in Fastrack
In HP Spec Lines "Ford Festiva (88-93)" change as follows:
Weight:
"1700 1600
*1743 1640
**1785 1680"
Notes:
"Compression ratio limited to 10.5 11.0:1. Valve lift limited to .450”."
SRF Driver Safety & Comfort
#37966 from Robey Clark · Rule change · TB 25-04 (2025-04 Fastrack)
addedSRF drivers with disabilities may modify seat and controls for safety and comfort with SCCA approval, noted in logbook, for that driver only.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.D, add the following:
"f. Driver Safety and Comfort modifications to seat and controls for drivers with disabilities may be made only by approval. These
modifications must be reported to SCCA Enterprises and noted in the car logbook. The modifications are approved only for the
noted driver with disabilities. If the car is used by or sold to another driver, it must be returned to the previous standard
configuration."
SRF Update SADEV transmission specs
#37992 from Club Racing Board · Rule change · TB 25-04 (2025-04 Fastrack)
wordingSRF SADEV-SRF3 6-speed sequential transmission: effective date clarified to 1 April 2025 onward.As printed in Fastrack
In SRF, GCR section 9.1.8.D.2.K, change as follows:
"OR
SADEV-SRF3 6-Speed Sequential (beginning from Oct. 4, 2021 onward):
1st 12-36 3.0000 : 1
2nd 15-31 2.0667 : 1
3rd 18-28 1.5556 : 1
4th 22-28 1.2727 : 1
5th 24-26 1.0833 : 1
6th 25-23 0.9200 : 1
Final Drive Ratio: 15-48 3.20"
T4 Correct Ring and Pinion Ratio to T3, Sorry I Mean T4 3.7 V6 Stang
#38041 from David Mead · Rule change · TB 25-05 (2025-05 Fastrack)
In T4 Spec Lines, Ford Mustang V6 (05-14), add to Notes the following:
"GT 8.8 rear axle assembly allowed. 3.45 or 3.55 final drive ratio allowed. 7.5 rear axle assembly with 3.45:1 final drive allowed."
Applies to Ford Mustang on this page: Scotty B White, Paolo Salvatore
AS Errors and Omission
#38055 from American Sedan Committee · Rule change · TB 25-05 (2025-05 Fastrack)
slower · inductionAS Ford Mustang GT 5.0L 15-17 flat plate restrictor reduces from 67mm to 64mm.As printed in Fastrack
In AS Spec Lines, Ford Mustang GT 5.0l (15-17), Flat Plate Restrictor Size, change as follows:
"67mm 64mm"
T4 T4 Mustang
#38058 from Scotty B White · Rule change · TB 25-05 (2025-05 Fastrack)
In T4 Spec Lines, Ford Mustang V6 (05-14), add to Notes as follows:
"OEM style rear deck spoiler similar to Laguna/CS packages permitted.”
Applies to Ford Mustang on this page: Scotty B White, Paolo Salvatore
AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO
#38197 from Jim Clark · Rule change · TB 25-05 (2025-05 Fastrack)
addedAS LS1/LS6 intakes added for 5.3L truck engine: part numbers 12561269 and 88894095.As printed in Fastrack
In GCR, Section 9.1.6.F., add the following to Intake Part #’s:
"17113697, 19418185, 89017230, 89017363, 89017364, and 89017365, 12561269 and 88894095"
T4 T4 Mustang
#38059 from Scotty B White · Rule change · TB 25-06 (2025-06 Fastrack)
In T4 Spec Lines, Ford Mustang V6 (05-14), change as follows:
Final Drive: "3.45 or 3.31"
"Weight: "3400 3300"
Applies to Ford Mustang on this page: Scotty B White, Paolo Salvatore
T4 SSC tire allowance
#38216 from Benjamin Bunk · Rule change · TB 25-06 (2025-06 Fastrack)
In T4 Spec Lines, Scion FR-S Solo Spec Coupe (13-16), change Notes as follows:
"Any 200TW 225/45/17 or 215/45/17 DOT tire permitted."
In T4 Spec Lines, Subaru BRZ Solo® Spec Coupe (13-16), change Notes as follows:
"Any 200TW 225/45/17 or 215/45/17 DOT tire permitted."
Applies to Subaru BRZ on this page: Angelica Sprehe
AS Errors and Omissions
#38234 from American Sedan Committee · Rule change · TB 25-06 (2025-06 Fastrack)
addedAS Ford Mustang GT 05-14 Restricted Prep Engine gains additional gear ratio option: 3.66, 2.43, 1.69, 1.32, 1.00, .65.As printed in Fastrack
In AS Spec Lines, Ford Mustang GT (05-14) with Restricted Prep Engine, add to Gear Ratios the following:
"or 3.66, 2.43, 1.69, 1.32, 1.00, .65"
Applies to Ford Mustang on this page: Michael Kamalian, Gregory Eaton, James Jost
FP Base Weight Adjustment for H-Production X1/9 Spec Lines
#38255 from Matthew Brannon · Rule change · TB 25-06 (2025-06 Fastrack)
faster · weightHP Fiat X-1/9 and Bertone 1500 minimum weights reduced to 1740 lbs, 1784 lbs, 1827 lbs; 1300 models to 1600, 1640, 1680 lbs; additional 1300 and 1500 specs to 2010, 1900 lbs.As printed in Fastrack
In HP Spec Lines, change Weight as follows:
Fiat X-1/9 & Bertone1500: “1790 1740 *1835 1784 **1880 1827”
Fiat X-1/9 1300: “1650 1600 *1691 1640 **1733 1680”
Fiat X-1/9 1300: “2060 2010”
Fiat X-1/9 1500: “1950 1900”
AS RE: Previous Letter 37695 Update
#38245 from Michael Kamalian · Rule change · TB 25-07 (2025-07 Fastrack)
faster · weightAS Ford Mustang GT 5.0 2018- minimum weight reduced to 3525 lbs.As printed in Fastrack
In AS Spec Lines, Ford Mustang GT 5.0 (2018-), change Weight as follows:
"3600 3525"
Applies to Ford Mustang on this page: Michael Kamalian
T4 Allow B-Spec cars to run in T4
#38439 from Derrick Ambrose · Rule change · TB 25-07 (2025-07 Fastrack)
In GCR, Section 9.1.9.2, Touring car eligibility, change as follows:
"Touring car eligibility: Cars are eligible for the class they are listed with a specification line and with the specific allowances
permitted. In addition T2-T4 cars may race one class up in touring classes above their specification line class as long as they are a
legal T2-T4 car and conform to their specification line allowances as classified. Cars conforming to B-Spec or C-Spec rules are
permitted to compete in Touring 4."
FP BMW Z4 update
#38490 from Bryce McGuire · Rule change · TB 25-07 (2025-07 Fastrack)
slower · inductionEP BMW Z4 03-05 gains 52mm flat plate intake restrictor.As printed in Fastrack
In EP Spec Lines, BMW Z4 (03-05), add to Notes the following:
“52mm Flat Plate Intake Restrictor.”
FP EP Fiat 124 Spider Competition Adjustment Request
#38498 from John Baucom · Rule change · TB 25-07 (2025-07 Fastrack)
faster · weightEP Fiat 124 Spider Competition 1600 and 2000 minimum weight drops 50 lbs to 2000; carburetors now allow 36mm chokes instead of 34mm.As printed in Fastrack
In EP Spec Lines, Fiat 124 Sport Spider 1600 & 124 Spider 2000, change as follows:
Weight: "2050 2000"
Carburetor No. & Type: "(2) Weber 40 IDF-40IFI, (2) Solex C40P116, 34 36mm choke(s) req’d, (2) Weber 45DCOE w/ 34 36 mm
choke(s) on I.R. manifold or fuel injection."
T4 Incorrect Touring Heading
#38451 from Terry Hanushek · Rule change · TB 25-08 (2025-08 Fastrack)
wordingT2, T3, T4 spec table header changed from T2 to ET.As printed in Fastrack
In T2-T4 Spec Lines, change Table Header as follows:
"T2 ET"
SRF Add HD Oil Cooler
#38979 from Robey Clark · Rule change · TB 25-10 (2025-10 Fastrack)
added · engineSRF3 adds HD Oil Cooler P/N G1148500 option alongside standard P/N G480503, no fan permitted.As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.V.ff, change as follows:
"SRF3 Oil Cooler, P/N G480503 or HD Oil Cooler P/N G1148500 may be used as mounted per the GEN3 Assembly Manual. No fan
permitted for SRF. HD Oil Cooler kit P/N G1148500 may be used as mounted per the GEN3 Conversion Manual."
FP HP Plymouth Arrow spec omission
#38995 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
addedHP Plymouth Arrow gains 4 or 5 speed transmission option specification.As printed in Fastrack
In HP Spec Lines, Plymouth Arrow (76-80), add the following wording to Trans. Speeds(max):
"4 or 5"
FP Add Wheel Diameter to Appendix G
#39008 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
wordingAppendix G.2.3 clarifies rim width and diameter are absolute maximums; wording corrected from 'is' to 'are'.As printed in Fastrack
In Appendix G.2.3, change as follows:
"Rim width and diameter are is absolute maximums."
FP Add TB ID tolerance to general Prod rules
#39009 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
addedEP, FP, HP throttle body inside dimensions and butterfly now allow +/-.25mm tolerance from stock.As printed in Fastrack
In GCR, Section 9.1.5.E., change as follows:
9.1.5.E.1.b.4: "The inside dimensions of the throttle body casting/housing (as measured at the throttle butterfly) must remain
stock (tolerance of +/-.25mm), but the throttle body can otherwise be ported and polished."
9.1.5.E.2.b.4: "The inside dimensions of the throttle body casting/housing and all dimensions of the throttle butterfly must
remain stock (tolerance of +/-.25mm)."
AS Cadillac CTS-V BOP Weight Change
#38640 from Alex Lozano · Rule change · TB 25-09 (2025-09 Fastrack)
faster · weightAS Cadillac CTS-V 04-07 Restricted Prep minimum weight drops to 3400 lbs.As printed in Fastrack
In AS Spec Lines, Cadillac CTS-V (04-07) Restricted Prep., change Weight as follows:
"(Effective 11/1/2025) 3450 3400"
FP Please Lower Weight of 280Z
#38871 from Matthew Miller · Rule change · TB 25-09 (2025-09 Fastrack)
faster · weightEP Nissan 280Z minimum weight lowered to 2400 lbs, 2460 lbs with *, 2520 lbs with **.As printed in Fastrack
In EP Spec Lines, Nissan 280Z, change Weight (lbs) as follows:
"(Effective 11/1/2025) 2560 2400
*2624 2460
**2688 2520"
FP Miata Weight Adjustment Follow Up
#38949 from Don Tucker · Rule change · TB 25-10 (2025-10 Fastrack)
faster · weightEP Mazda MX-5 1.8L 90-97 minimum weight reduced to 2125 lbs.As printed in Fastrack
In EP Spec Lines, Mazda MX-5 / Miata 1.8L (90-97), Effective 11/1/2025 make the following weight change:
"2150 2125"
T4 02-06 Mini Cooper Gear Ratios
#38966 from Trenton Kramer · Rule change · TB 25-11 (2025-11 Fastrack)
In T4 Spec Lines, Mini Cooper S R53 (02-06), change Gear Ratios as follows:
"12.79, 7.79, 5.65, 4.62, 3.83, 3.13 or overall- 11.42, 7.18, 5.39, 4.40, 3.65, 2.96"
FP Weight Break for 1098 Midget / Sprite
#38970 from Kendall Jones · Rule change · TB 25-10 (2025-10 Fastrack)
faster · weightHP Spec Lines Austin-Healey Sprite/Midget 1098cc minimum weight drops to 1550 lbs.As printed in Fastrack
In HP Spec Lines, Austin-Healey Sprite/Midget 1098cc, Effective 11/1/2025make the following weight change:
"1630 1550"
T4 Reinstatement of the 2005-2010 Cobalt into T4
#38987 from Tim Little · Rule change · TB 25-11 (2025-11 Fastrack)
In T4 Spec Lines, classify Chevrolet Cobalt SS, Sport Coupe (06-10) as follows:
A specification table follows in the original; it is not shown here.
FP HP Volvo 142 spec omission
#38994 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
slower · engineHP Volvo 142 P-1800 engine gains compression ratio limit 12.0:1 and valve lift limit .425 inch.As printed in Fastrack
In HP Spec Lines, Volvo 142/142E P-1800 Engine, Effective 11/1/2025 add the following wording to Notes:
"Comp. Ratio limited to 12.0:1. Valve lift limited to .425”."
FP HP Mini DOHC 1.6
#38996 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
slower · engineHP Mini DOHC 1.6 valve lift limit drops to .390" from .450".As printed in Fastrack
In HP Spec Lines, Mini Cooper (07-13) (includes 09-15 convertible and 12-15 Coupe), Effective 11/1/2025 make the following
changes to the Notes:
"Compression ratio limited to 11.0:1, Valve lift limited to .450”.390"."
FP 83-88 FP Scirocco Spec Line Creation
#38997 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
addedFP Scirocco 83–88 classified Prep Level 1: 1733–1803 lbs, 1715–1780 cc, iron block, aluminium head, carburetted or fuel injected.As printed in Fastrack
In FP Spec Lines, classify Volkswagen Scirocco (83-88) as follows:
A specification table follows in the original; it is not shown here.
FP Add to Rabbit description
#39019 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
wordingFP and HP Volkswagen Rabbit descriptions updated to clarify Cabriolet body style inclusion.As printed in Fastrack
In FP Spec Lines, make the following spec line correction:
"Volkswagen Rabbit (Includes Convertible Cabriolet)"
In HP Spec Lines, make the following spec line correction:
"Volkswagen Rabbit 1588 (Includes Cabriolet)"
"Volkswagen Rabbit 1715 (Includes Cabriolet)"
"Volkswagen Rabbit 1780 (Includes Cabriolet)"
FP Clean-up 9.1.5.E.7e
#39025 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
otherEP, FP, HP: rear drum-to-disc brake conversion clarified; rotors solid, diameter limited to largest front rotor permitted.As printed in Fastrack
In GCR, Section 9.1.5.E.7., change as follows:
"e. Cars fitted with rear drum brakes, can convert to rear disc brakes without penalty. Note that the “Brakes Std.” and “BrakesAlt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes stock, from converting to reardisc brakes under this rule. When converting from rear drum brakes to rear disc brakes:
1. Rear brake rotors must be solid and can be no larger in diameter than the largest permitted front brake rotor, as defined on
the vehicle’s spec line.
2. Rear calipers and mounting brackets are unrestricted but must be made of a ferrous or aluminum material. The standard andalternate brake listings on a vehicle’s specification line, does not prohibit a car that was fitted with rear drum brakes as stockfrom converting to rear disc brakes under this rule.
3. The “Brakes Std.” and “Brakes Alt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes
as stock from converting to rear disc brakes under this rule."
T4 Request to Classify Mercedes C230K
#39080 from Patrick Morgan · Rule change · TB 25-11 (2025-11 Fastrack)
In T4 Spec Lines, classify Mercedes C230 Kompressor (2002-2005) as follows:
A specification table follows in the original; it is not shown here.
FP Add TB size to Ford Mustang (94-98) Spec Line
#39130 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
added · inductionEP Ford Mustang 94-98 fuel injected throttle body inside diameter set to 60.As printed in Fastrack
In EP Spec Lines, Ford Mustang (94-98) add the following to the Fuel Injected Equipped Throttle Body Inside Diameter column:
"60"
FP Correct Existing VW Scirocco Spec Line
#39140 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
removed · cars addedFP Volkswagen Scirocco: remove two weight tiers at 1733 and 1803 lbs, two engine options, and 13-inch wheel option; allow 15-inch wheels.As printed in Fastrack
In FP Spec Lines, Volkswagen Scirocco, change spec line as follows:
A specification table follows in the original; it is not shown here.
T4 ND Gearset Request for T4
#39166 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)
addedT3 and T4 Mazda MX-5 Miata add permitted gearset kit PT#0000-02-6100 to Notes.As printed in Fastrack
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), add to Notes the following:
"Gear kit Kit PT#- 0000-02-6100."
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), add to Notes the following:
"Gear kit Kit PT#- 0000-02-6100."
In T3 Spec Lines, Mazda MX-5 Miata (16-18), add to Notes the following:
"Gear kit Kit PT#- 0000-02-6100."
In T3 Spec Lines, Mazda MX-5 Global Cup Miata (2016-2021) ND1, ND, add to Notes the following:
"Gear kit Kit PT#- 0000-02-6100."
T4 E&O wheel size on ND
#39168 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Wheel Size (in.) as follows:
"17 x 7.5"
T4 ND Spec Lines Wrong PT#'s
#39170 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)
removedT4 MX-5 Miata 19-24 and 16-18, T3 MX-5 16-18 and Global Cup ND1/ND: discontinued DG Motorsports hardtop part #0000-07-5901 removed from permitted list.As printed in Fastrack
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), change Notes as follows:
"Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must remain
stock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from moving
action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including
Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r) sway bars
allowed. 3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804-02,
0000-02-5804-01). Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs
#0000-04-9700-08, springs up to 500lb front and 300lb rear allowed. Mazda tower brace 0000-04-5626 allowed. Mazda header
0000-06-5410 allowed."
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Notes as follows:
"Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. Retractable hardtop option permitted
but must be disabled from moving action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the
OEM roof silhouette, including Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports).
29mm (f) 16mm (r) sway bars allowed. Up to 500lb front and 300lb rear springs allowed. Mazda Motorsports Header part
#0000-06-5410 allowed. Mazda tower brace 0000-04-5626 allowed. 3rd and 4th gear may be replaced with the following parts-
(0000-02-5803-02, 0000-02-5803-01, 0000-02-5804-02, 0000-02-5."
In T3 Spec Lines, Mazda MX-5 Miata (16-18), change Notes as follows:
"Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. Header permitted. Cold air intake
permitted. Front strut brace permitted. Front and rear sway bars permitted up to 35mm, Springs 800 front and 800 Rear max
permitted. Any OEM or aftermarket hardtop permitted that retains the OEM roof silhouette including Mazda hardtop part
#0000-07-5902- ND and part #0000-07-5901 (discontinued DG Motorsports top). If a hardtop is used, latches shall be replaced
with positive fasteners. Retractable hardtop option permitted but must be disabled from moving action and positively fastened.
In T3 Spec Lines, Mazda MX-5 Global Cup Miata (2016-2021) ND1, ND, change Notes as follows:
"Shoulder harness installation must conform to FIA mounting specifications that are approved for this vehicle per section 6.2 FIA
article 253, safety equipment. Must meet all ND2 MX-5 Global Cup rules. Any OEM or aftermarket hardtop is permitted that
retains the OEM roof silhouette, including Mazda hardtop Mazda hardtop part #0000-07-5902-ND and #0000-07-5902-ND part#0000- 07-5901 (discontinued DG Motorsports). If a hardtop is used, latches shall be replaced with positive fasteners. OBD2
requirement does not apply. Ballast box may be removed. ND2s with sequential gearbox allowed +100 lbs.
T4 Touring 4 Post-Runoffs BOP Adjustments and Changes
#39251 from Touring Committee · Rule change · TB 25-11 (2025-11 Fastrack)
In T4 Spec Lines, Acura RSX/ RSX Type-S (02-06), change Restrictor as follows:
"55mm FPR"
In T4 Spec Lines, Acura TSX (2004-2008), change Restrictor as follows:
"47mm FPR 52mm FPR"
In T4 Spec Lines, BMW Z4 2.5L (03-05) , change Weight as follows:
"3050 2950"
In T4 Spec, BMW 320i (14-15), remove this spec line in its entirety.
In T4 Spec Lines, BMW 323 (98-00), change as follows:
Show 36 more lines
Tire size: "225 245"
Weight: "3250 3150"
In T4 Spec Lines, Ford Mustang V6 (05-14), change as follows:
Restrictor: "50mm 43mm"
Weight: "3300 3400"
In T4 Spec Lines, Honda Civic Si (06-11), change Restrictor as follows:
"55mm"
In T4 Spec Lines, Honda Civic Si (12-15), change as follows:
Restrictor: "47mm 52mm
Notes: "Transmission and Differential must be stock."
In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), change as follows:
Weight: "2550 2500"
Notes: "Factory bolt-in roll bar/cross member may be removed to facilitate roll cage installation. MSR option permitted.
Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front spring mount PT#-0000-
04-5259, front springs #0000-04-9700-08, rear spring mount PT#-0000-04-5258, rear springs #0000- 04-9400-07, helper springs
#0000-04-HLPR-EB (optional), Swaybar kit – PT#-0000-04-5306-EB that includes (front sway bar kit PT#0000-04-5306-FT, rear
sway bar kit PT#-0000-04-5306-RR), offset front camber bushing PT#- 0000-04-5407-NC. Mazda Motorsports cold air intake part
#0000-06-5150-KT allowed. Mazda Motorsport RX8 rear Hub Conversion kit part number 0000-04-5811-KT allowed, RX8 front
hubs PT# F189-33-04X allowed. Allow Mazda header part numbers 0000-06-5407 or 0000-06-5407-NC. Any OEM or aftermarket
hardtop is permitted that retains the OEM roof silhouette, including Mazda hardtop and part #0000-07-5901-CC. Aftermarket
power steering reservoir is allowed. Mazda Transmission kit part # 0000-02-5700. Mazda Motorsports LSD #32655 permitted
without penalty. Any other non-OEM limited slip differential allowed with +50 lbs. weight penalty. Front spoiler permitted
(NF51-V4-900F). Transmission kit # 0000-02-57
In T4 Spec Lines, Pontiac Solstice / Saturn Sky (06-09), change as follows:
Weight: "2800 2700"
Brakes: "(F) 296 315 Vented Disc max (R) 278 Solid Disc"
Notes: "GM calipers #22720705, and #25900764 permitted"
In T4 Spec Lines, Scion FRS/10 series (13-16), change Weight as follows:
"2925 2875"
In T4 Spec Lines, Subaru BRZ/ BRZ Limited (13-16), change Weight as follows:
"2925 2875"
In T4 Spec Lines, Subaru BRZ (17-21), change Weight as follows:
"3000 2950"
In T4 Spec Lines, Toyota 86, GT (17-21), change Weight as follows:
"3000 2950"
SCCA Runoffs
Applies to Ford Mustang on this page: Scotty B White, Paolo Salvatore
Applies to Mazda MX-5 on this page: Marc Cefalo, Robert Spence, Kevin Fryer, Richard Mooney, Sergio Zlobin
Applies to Subaru BRZ on this page: Angelica Sprehe
AS 1994 Mustang Spec Line Request
#39104 from Barry Borgschatz, Jr · Rule change · TB 25-12 (2025-12 Fastrack)
added · engineAS Ford Mustang GT 94-04 Restricted Prep Engine now permits Ford Motorsport M-6250-F303 camshaft.As printed in Fastrack
In AS Spec Lines, Ford Mustang GT(94-04) with Restricted Prep Engine, add to notes the following:
"Ford Motorsport #M-6250-F303 camshaft is permitted."
Applies to Ford Mustang on this page: Michael Kamalian, Thomas J Ellis
FP TR2 Notes E&O
#39180 from Anthony Parker · Rule change · TB 25-12 (2025-12 Fastrack)
wordingEP Triumph TR2–TR4A may use 5-speed gearbox without overdrive; Weber carburetors and weight reference deleted.As printed in Fastrack
In EP Spec Lines, Triumph TR2, 3, 3A, 4, 4A, TR4, TR4A, IRS, make the following change to the Notes:
"Front apron assembly may be made of alternate material. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990lbs. Laycock overdrive, may use 5 speed gearbox without overdrive."
FP Balance of Power
#39187 from Jim Simaras · Rule change · TB 25-12 (2025-12 Fastrack)
slower · inductionEP BMW Z3 2.5L and other models get smaller restrictors, 50mm to 55mm, and Z3 2.5L weight rises 50 to 78 lbs.As printed in Fastrack
In EP Spec Lines, make the following changes to Restrictors:
BMW Z3 2.5L: "52mm 50mm Flat Plate Intake Restrictor"
BMW Z3 2.8L (97-00): "55mm 53mm Flat Plate Intake Restrictor"
BMW 328i/is E36 (96-99): "58mm 55mm Flat Plate Intake Restrictor"
BMW 328i/ci E46 (01-06): "58mm 55mm Flat Plate Intake Restrictor"
BMW 325i/is (E46) (01-06): "56mm 53mm Flat Plate Intake Restrictor"
BMW 325is M-Technic (1994): "56mm 53mm Flat Plate Intake Restrictor"
BMW 325i/is E-36 (92-95): "56mm 53mm Flat Plate Intake Restrictor"
In EP Spec Lines, BMW Z3 2.5L, change Weight as follows:
"2500 2550
*2563 2614
**2625 2678"
FP Competition Adjustment Request
#39259 from David Strittmatter · Rule change · TB 25-12 (2025-12 Fastrack)
faster · weightFP Lancia Scorpion minimum weight cut to 1950 lbs from 2030 lbs.As printed in Fastrack
In FP Spec Lines, Lancia Scorpion, change Weight as follows:
"2030 1950"
FP Factory Roll Bar Removal on VW Convertible
#39268 from Tim Linerud · Rule change · TB 25-12 (2025-12 Fastrack)
wordingFP VW Rabbit Convertible no longer required to remove factory roll bar.As printed in Fastrack
In FP Spec Line, Volkswagen Rabbit (Includes Convertible), remove the following wording in Notes:
"Factory roll bar must be removed on Cabriolet."
T4 Classing 1995-99 Dodge Neon SOHC
#39285 from Preston Obremski · Rule change · TB 25-12 (2025-12 Fastrack)
In T4 Spec Lines, classify Dodge/Plymouth Neon ACR SOHC/DOHC (2/4 door) (95-99) as follows:
A specification table follows in the original; it is not shown here.
FP FP Parity Request
#39325 from Mason Workman · Rule change · TB 25-12 (2025-12 Fastrack)
slower · weightFP Acura Integra and Honda Civic models gain 50–79 lbs minimum weight; Mazda Miata and Mercury Capri compression ratio to 11.0:1 and valve lift to .425".As printed in Fastrack
In FP, change Weight as follows:
Acura Integra (90-93):
"2235 2285
*2291 2342
**2347 2399"
Acura Integra LS (94-01):
"2260 2310
*2317 2368
**2373 2426"
Acura Integra GSR (92-93):
"2325 2375
*2383 2434
**2441 2494"
Honda Civic Del Sol VTEC (94-97):
"2290 2340
*2347 2399
**2378 2457"
Honda Civic Si (99-00):
"2250 2300
*2306 2358
**2363 2415"
FP Spec Lines, change Notes as follows:
Mazda Miata 1.6L (90-97): "Comp. Ratio limited to 10.0:1 11.0:1, Valve lift limited to .390” .425"."
Mercury Capri 1.6L (91-94): "Comp. Ratio limited to 10.0:1 11.0:1, Valve lift limited to .390” .425"."
FP Adjust former-GTL Honda's with B/D-Series Engines
#39374 from Production Committee · Rule change · TB 25-12 (2025-12 Fastrack)
slower · weightFP Honda D15, D16, B16A, B18 engines gain 105–120 lbs minimum weight across seven configurations.As printed in Fastrack
In GCR, Appendix N GTL inclusion into FP, Engines - HONDA, change Disp. (cc) – Weight (lbs) as follows:
"D15 – 1493cc – 1895 2000
D15b7 – 1493cc – 1895 2000
D16 – 1590cc – 1945 2055
D16A – 1590cc – 1945 2055
B16A – 1595cc – 1950 2065
B18 – 1797cc – 2050 2170
B18 – 1834cc – 2065 2185"
T4 Alternate Placement of Fuse Panel and Electronics Request
#39370 from Aaron Stehly · Rule change · TB 26-01 (2026-01 Fastrack)
addedT2, T3, T4 now allow under-dash electronics relocation for access after roll cage installation.As printed in Fastrack
In GCR, Section 9.1.9.2.D.9.d, add the following:
"8. Under-dash electronics including computers, modules and fuse boxes may be relocated so they can be easily accessed after
roll cage installation."
AS Restrictor Plate Change for Gen 2 Ford Coyote Engine
#39501 from American Sedan Committee · Rule change · TB 26-01 (2026-01 Fastrack)
slower · inductionAS Ford Mustang and Mercury Capri with Restricted Prep engines get 61 mm restrictor, down from 64 mm.As printed in Fastrack
In AS Spec Lines, change Restrictor as follows:
Ford Mustang Incl. Cobra and Cobra R (79-93) and Mercury Capri (79-86) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang GT (94-04) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang Coupe GT (05-14) Restricted Prep 5.0L/6 speed 4 valves per cylinder: "64 mm 61 mm"
Ford Mustang GT (05-14) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang GT 5.0L (15-17) Restricted Preparation: "64 mm 61 mm"
T4 Clarify T4 Brake Rotor Allowance
#39503 from David Mead · Rule change · TB 26-01 (2026-01 Fastrack)
wordingT4 Performance clarified: 1-piece alternative rotors permitted only at sizes listed in spec line; alternate brake kits may use matching 1-piece rotors.As printed in Fastrack
In GCR, Section 9.1.9.2.D.6.a.6., change as follows:
"In T2-Performance alternative rotors, including 2 piece rotors are permitted. Rotors must be within 5% of OE diameter or a
maximum diameter of 360mm.
In T3- Performance alternative rotors, including 2 piece rotors are permitted with a maximum diameter of 360mm.
T4- Performance alternative 1-piece rotors are permitted but rotors must meet the sizes listed in the spec line. Spec lines
showing alternate brake kits are also permitted to use 1-piece performance alternative rotors of the same size."
FP Request Toyota 5E Series Engines
#38208 from Scott Schick · Rule change · TB 26-02 (2026-02 Fastrack)
addedFP adds Toyota 5E 1497cc DOHC engine, 1900 lbs, 23mm restrictor, SIR fuel induction.As printed in Fastrack
In FP Appendix N, add spec line for the Toyota 5E engine to the "Engines - TOYOTA" section:
A specification table follows in the original; it is not shown here.
FP Request for Toyota 4E Series Engines
#38209 from Scott Schick · Rule change · TB 26-02 (2026-02 Fastrack)
addedFP class adds Toyota 4E DOHC 1331 cc engine, 1900 lbs minimum weight, unrestricted fuel induction.As printed in Fastrack
In FP Appendix N, add spec line for the Toyota 4E engine to the "Engines - TOYOTA" section:
A specification table follows in the original; it is not shown here.
AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request
#39055 from Jason Smith · Rule change · TB 26-01 (2026-01 Fastrack)
addedAS GM LM7 5.3L gains Edelbrock 71187 intake manifold, MSD 6014 ignition box, Holly 4776 carb option under full prep spec line.As printed in Fastrack
In GCR, Section 9.1.6.D.2.h.2., add the following:
"(Effective 2/1/2026) i. Weight based on full preparation chassis choice spec line for GM LM7 5.3L
Carburetor Option:
Must use the full prep 4776 holly carburetor and spacer gasket
Edelbrock Performer RPM 71187 intake manifold
MSD 6014 ignition box
(Edelbrock part # kit 7118)"
T4 T4 and T3 Feedback
#39230 from Tim Myers · Rule change · TB 26-02 (2026-02 Fastrack)
In T4 Spec Lines, remove Ford Mustang V6 (05-14) in its entirety.
T4 T4 Mustang 4.0
#39489 from Scotty B White · Rule change · TB 26-02 (2026-02 Fastrack)
In T4 Spec Lines, Ford Mustang V6 (05-10), change as follows:
Tire: "245 255"
Notes: "ABS (option code 552) allowed. FR3 Handling Pack #M-2007-FR3V6 allowed (kit does not need to be run in its entirety).
The kit includes: Dampers M-18000-A, Lowering Springs M-5300-N, Sway Bars M- 5490-C, Strut Tower Brace M-20201-F. Ford
Positraction LSD part #M-4204-C75 is allowed. Any springs max F: 500 and R: 400 permitted. Any sway bar up to F: 35mm and R:
28mm permitted. Aftermarket Shocks conforming to T4 rules allowed. Panhard bar, part # BAR-M-4264-A permitted, or any pan
hard bar permitted must be set at same length as a stock bar, center mounting hole to center mounting hole +/- 0.25 inch. An
alternative steel drive shaft is permitted; this drive shaft is otherwise unrestricted, but no modifications to other components
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are permitted to facilitate its installation. An Aluminum driveshaft is allowed. Any LSD permitted. Ford brake kit M-2300-D
allowed. Aftermarket header allowed. GT 8.8 rear axle assembly allowed. 3.45 or 3.55 Alternate final drive ratio allowed. 7.5
rear axle assembly with 3.45:1 final drive allowed. Cold Air Intake allowed. Koni part numbers 8741-1494SPORT (front) and
8241-1240SPORT (rear). Spec clutch #SF661 and flywheel #SF66A permitted. 14” Brembo Brake Kit#M-2300-S permitted."
Applies to Ford Mustang on this page: Paolo Salvatore
FP Dual Carbs for the Fiat X1/9
#39593 from Daniel Snow · Rule change · TB 26-02 (2026-02 Fastrack)
faster · engineFP Fiat X1/9 fuel injection carburetors simplified to one 36 or 40 DCNF option; exhaust valve enlarged to 33.0/1.30.As printed in Fastrack
In FP Spec Lines, change as follows:
Fiat X-1/9 & Bertone 1300:
"(1) Weber 32 DMTR or DATRA/100 w/32mm bores
(1) 40 DCNF w/32mm choke(s)
(2) auto-type side-draft w/28mm choke(s) on I.R. manifold
Orientation of the alternate carburetor is unrestricted. The alternate carb adapter may not be thicker than 1.25”. The adapter
may have a bore larger than the throttle bore of the approved alternate carburetor.
Valve Size: (I) 35.5/(1.40) (E) 31.3/(1.23)30.5/(1.20) (E) 1.23
Trans. Speeds: 5"
Fiat X-1/9 & Bertone:
"Fuel Injection
(1) 34 DMTR, (1) 36 DCNF w/34mm choke(s), or (1) 40DCNF w/34mm choke(s)
(1) 36 or 40 DCNF w/34mm choke(s)
(2) auto-type side-draft w/28mm choke(s) on I.R. manifold
Orientation of the alternate carburetor is unrestricted. The alternate carb adapter may not be thicker than 1.25”. The adapter
may have a bore larger than the throttle bore of the approved alternate carburetor.
Valve Size: (I) 35.5/(1.40) (E) 33.0/(1.30)
Trans. Speeds: 5 or 4"
T4 Allow Alt Bushing Material in Toe Links
#39607 from David Mead · Rule change · TB 26-02 (2026-02 Fastrack)
added · suspension & brakesT2-T4 adjustable toe links now allow performance alternative bushings and spherical bearings, previously only spherical bearings permitted.As printed in Fastrack
In GCR, Section 9.1.9.D.5.a.1., change as follows:
"T2-T4: A maximum of 3.5 degrees of negative camber is allowed on front and rear suspensions. Spec line part(s) may not be
modified to increase caster and camber. Strut suspensions may adjust camber and caster by the use of eccentric bushings,
eccentric bolts (crash bolts) at the strut-to-spindle, and/or by use of slotted adjustment plates at the top of the strut mounting
plate. If upper strut slotted adjustment plates are used, they shall be located on existing chassis structure, utilizing the
unmodified manufacturer’s original bolt holes and may not serve as reinforcement for that structure. Slotted adjustment plates
(strut camber plates) may incorporate a single spherical bearing (spherical bushing) and a ball thrust bearing per strut tower. On
other forms of suspension, camber and caster adjustment may be achieved by the use of shims and/or eccentric
bushings. Adjustable toe links with spherical bearings are permitted and may serve no purpose other than adjusting toeangle. Adjustable toe links are permitted. They are allowed to have performance alternative bushings and spherical bearings.
They may serve no purpose other than adjusting toe angle. Spherical bearings/bushings are not permitted in T2-T4 except for the
specific examples listed in the class rules or vehicle spec line."
T4 ND MX-5 Spec Line Rewrite Request
#39802 from Josh Smith · Rule change · TB 26-03 (2026-03 Fastrack)
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), change as follows:
Weight: "2750 2650"
Notes: "Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must
remain stock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from
moving action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette,
including Mazda hardtop part #0000-07-5902-ND. 29mm (f) 16mm (r) sway bars allowed. 3rd and 4th gear may be replaced withthe following parts- (0000-02- 5803-02, 0000-02-5803-01, 0000-02-5804-02, 0000-02-5804-01). Suspension package permittedwith a 100 lbs. weight increase that includes the following parts: front springs #0000-04-9700-08, s Suspension
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Permitted: Springs up to 500lb front and 300lb rear allowed. 29mm (f) 16mm (r) sway bars allowed. Mazda tower brace 0000-
04-5626 allowed. Mazda header 0000-06-5410 allowed. Gear kit Kit PT#- 0000-02-6100. 3rd and 4th gear may be replaced with
the following parts- (0000-02- 5803-02, 0000-02-5803-01, 0000-02-5804-02, 0000-02-5804-01). OEM Club Package Brembo
calipers permitted. 2016-2018 chassis/body permitted."
In T4 Spec Lines, Mazda MX-5 Miata/ Club (16-18), change as follows:
Weight: "2575 2550"
Notes: “Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. Retractable hardtop optionpermitted but must be disabled from moving action and positively fastened. Any OEM or aftermarket hardtop is permitted thatretains the OEM roof silhouette, including Mazda hardtop part #0000-07-5902-ND 29mm (f) 16mm (r) sway bars allowed. Up to500lb front and 300lb rear springs allowed. Mazda Motorsports Header part #0000-06-5410 allowed. Mazda tower brace 0000-04-5626 allowed. 3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804-02, 0000-02-5804- 01). Gear kit Kit PT#- 0000-02-6100 Factory bolt-in roll bar/ cross member may be removed to facilitate
roll cage installation. The following item(s) must remain stock: transmission differential unless specified below. Retractable
hardtop option permitted but must be disabled from moving action and positively fastened. Any OEM or aftermarket hardtop is
permitted that retains the OEM roof silhouette, including Mazda hardtop part #0000-07-5902-ND. Suspension Permitted: Springs
up to 500lb front and 300lb rear allowed. 29mm (f) 16mm (r) sway bars allowed. Mazda tower brace 0000-04-5626 allowed.
Mazda header 0000-06-5410 allowed. Gear kit Kit PT#- 0000-02-6100. 3rd and 4th gear may be replaced with the following
parts- (0000-02- 5803-02, 0000-02-5803-01, 0000-02-5804-02, 0000-02-5804-01). OEM Club Package Brembo calipers
permitted."
T4 4.0 Mustang spec line cleanup
#39831 from David Mead · Rule change · TB 26-03 (2026-03 Fastrack)
In T4 Spec Lines, Ford Mustang V6 (05-10), change Notes as follows:
"ABS (option code 552) allowed. FR3 Handling Pack #M-2007-FR3V6 allowed (kit does not need to be run in its entirety). The kitincludes: Dampers M-18000-A, Lowering Springs M-5300-N, Sway Bars M- 5490-C, Strut Tower Brace M-20201-F. FordPositraction LSD part #M-4204-C75 is allowed. Any springs max F: 500 and R: 400 permitted. Any sway bar up to F: 35mm and R:28mm permitted. Aftermarket Shocks conforming to T4 rules allowed. Panhard bar, part # BAR-M-4264-A permitted or any panhard bar permitted must be set at same length as a stock bar, center mounting hole to center mounting hole +/- 0.25 inch. Analternative steel drive shaft is permitted; this drive shaft is otherwise unrestricted, but no modifications to other componentsare permitted to facilitate its installation. An Aluminum driveshaft is allowed. Any LSD permitted. Ford brake kit M-2300-D
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allowed. Aftermarket header allowed. GT 8.8 rear axle assembly allowed. 3.45 or 3.55 final drive ratio allowed. 7.5 rear axleassembly with 3.45:1 final drive allowed. Cold Air Intake allowed. Koni part numbers 8741-1494SPORT (front) and 8241-1240SPORT (rear). Spec clutch #SF661 and flywheel #SF66A permitted. 14” Brembo Brake Kit#M-2300-S permitted Any springs
max F: 500 and R: 400 permitted, Any sway bar up to F: 35mm and R: 28mm permitted. Any pan hard bar permitted must be set
at same length as a stock bar, center mounting hole to center mounting hole +/- 0.25 inch. Any alternate metal driveshaft is
allowed. Ford brake kit M-2300-D allowed. 14” Brembo Brake Kit#M-2300-S permitted with OEM 355mm rotors
allowed. Aftermarket header allowed. Cold Air Intake allowed. S197 Mustang 8.8 or 7.5 rear axle allowed with any ratio. Spec
clutch #SF661 and flywheel #SF66A permitted."
Applies to Ford Mustang on this page: Paolo Salvatore
FP Correct Valve Sizes on FP Fiat x19 1300 and 1500
#39850 from DANIEL SNOW · Rule change · TB 26-03 (2026-03 Fastrack)
otherFP Fiat X-1/9 1300 and 1500 intake and exhaust valve sizes corrected to 36.3/(1.43) and 31.2-33.3/(1.23-1.31).As printed in Fastrack
In FP Spec Lines, change Drivetrain Notes as follows:
Fiat X-1/9 & Bertone 1300:
Valve Size: "(I) 35.5/(1.40) (E) 31.3/(1.23) (I) 36.3/(1.43) (E) 31.2/(1.23)"
Fiat X-1/9 & Bertone:
Valve Size: "(I) 35.5/(1.40) (E) 33.0/(1.30) (I) 36.3/(1.43) (E) 33.3/(1.31)"
FP Dual Carburetor Adjustments
#39851 from DANIEL SNOW · Rule change · TB 26-03 (2026-03 Fastrack)
faster · inductionFP Fiat X-1/9 & Bertone dual carburetors choke size increases from 28mm to 30mm on intake runner manifold.As printed in Fastrack
In FP Spec Lines, Fiat X-1/9 & Bertone, change Drivetrain Notes as follows:
"(2) auto-type side-draft w/28 30mm choke(s) on I.R. manifold"
AS Re-Organization of AS Spec lines for 2026
#39887 from American Sedan Committee · Rule change · TB 26-03 (2026-03 Fastrack)
wordingAS Spec Lines reorganized for 2026; detailed chassis, engine, weight, wheelbase, tire and brake specifications moved to main rules and engine build sheets.As printed in Fastrack
This AS Spec Lines re-organization simplifies the Spec Lines for all drivers. This version gives the chassis information on what
engines can be put in their cars. It removes information that is now repeated in the ruleset and adds engine/weight combos as
well as wheelbase/tire size information. The Notes in the Spec Lines have been reviewed to remove information now listed in
the engine build sheets and retain information pertinent to the chassis selected. Where there is nothing in the notes, it is not an
error. It just means everything a driver needs is now in the main rules or the build sheets.
In AS Spec Lines, delete current Spec Line in its entirety as follows:
A specification table follows in the original; it is not shown here.
SRF SRF3 Spark Plugs
#39899 from Robey Clark · Rule change · TB 26-03 (2026-03 Fastrack)
engineSRF3 spark plugs limited to NGK LTR7IX-11 P/N G301041 only; washers and sealing rings prohibited.As printed in Fastrack
In SRF, GCR section 9.1.8.D.2.H.18, add the following:
"Spark Plugs: P/N G301041 ONLY NGK LTR7IX-11 / Washers or sealing rings are not allowed for any purpose."
What the rules allowed changed as listed; this does not say what any particular car ran.
Sectors
- S1 SF → IM1
- S2 IM1 → IM2
- S3 IM2 → SF
- SPd IM2 → IM3 0.02 mi
Sectors are numbered in lap order from start/finish, whatever each event's timing called them; the loop names are SCCA timing's.