BoP Lab / Michelin Raceway Road Atlanta

FF + EP at Michelin Raceway Road Atlanta

One lap is left out as timing errors (far too short to be a lap of this track). The rest of those sessions, sectors included, is used.

Pos	Car	Driver	Class	#	Lap	Theoretical	Qual	Race	5-lap stint	Consistency	Trap	S1	S2	S3
1	Piper DF05	Porter Aiken	FF	21	1:31.000 D-Q2	1:31.000	1:31.000 D-Q2	1:31.797 D-R1	1:32.268 D-R1	+0.761 D-R1	130.3 D-Q2	34.534 D-Q2	33.016 D-Q2	23.450 D-Q2
2	Mygale SJ14H	Robert Albani	FF	41	1:31.059 D-R1	1:30.869	1:35.262 D-Q2	1:31.059 D-R1	1:33.944 D-R1	+4.021 D-R1	135.6 D-Q1	33.334 D-R1	33.590 D-R1	23.945 D-R1
3	Swift DB6	John Robinson II	FF	19	1:31.242 D-R1	1:30.895	1:32.097 D-Q2	1:31.242 D-R1	1:32.292 D-R1	+1.746 D-R1	134.3 D-R1	34.930 D-Q2	32.498 D-R1	23.467 D-R1
4	Van Diemen RF00	Chris Smith	FF	57	1:31.334 D-R1	1:31.173	1:34.065 A-Q2	1:31.334 D-R1	1:32.700 D-R1	+2.012 D-R1	134.3 D-R1	34.806 D-R1	32.940 D-R1	23.427 D-R1
5	Mygale SJ13	Sebastian Mateo Naranjo 2+ cars	FF	08	1:31.374 D-Q2	1:31.098	1:31.374 D-Q2	1:31.587 D-R1	1:32.290 D-R1	+1.352 D-R1	133.1 D-R1	34.756 D-R1	32.943 D-R1	23.399 D-Q2
6	Van Dieman FF	Joe Colasacco	FF	3	1:31.412 D-R1	1:30.726	1:32.745 D-Q2	1:31.412 D-R1	1:32.178 D-R1	+1.095 D-R1	134.5 D-R1	34.483 D-R1	32.731 D-R1	23.512 D-R1
7	Mygale SJ14\Honda	Callum Baxter	FF	65	1:31.421 D-R1	1:31.165	1:32.506 D-Q2	1:31.421 D-R1	1:31.997 D-R1	+1.184 D-R1	135.8 D-R1	34.649 D-R1	32.985 D-R1	23.531 D-R1
8	Mygale F1600	Dillon Defonce	FF	81	1:31.562 D-R1	1:30.771	1:32.699 D-Q2	1:31.562 D-R1	1:31.953 D-R1	+0.859 D-R1	134.3 D-R1	34.482 D-R1	32.966 D-R1	23.323 D-R1
9	Mygale GR	Ely Navarro	FF	01	1:31.574 D-R1	1:31.312	1:31.621 D-Q2	1:31.574 D-R1	1:32.240 D-R1	+0.979 D-R1	130.3 D-R1	34.547 D-R1	33.192 D-R1	23.573 D-Q2
10	Mygale F1600	David Ybarra	FF	06	1:31.691 A-R1	1:31.691	1:32.437 A-Q2	1:31.691 A-R1	1:32.944 A-R1	+1.826 A-R1	125.2 A-P	34.633 A-R1	33.438 A-R1	23.620 A-R1
11	Mygale SJ2014	Sebastian Mateo Naranjo 2+ cars	FF	08	1:32.019 C-Q1	1:31.577	1:32.019 C-Q1	1:32.061 C-R2	1:32.398 C-R2	+1.179 C-R2	119.9 C-R2	34.874 C-R2	33.156 C-R2	23.547 C-R2
12	Van Dieman F1600	Trevor Russell	FF	32	1:32.266 D-R1	1:31.838	1:34.162 D-Q2	1:32.266 D-R1	1:32.747 D-R1	+1.246 D-R1	130.5 D-R1	34.751 D-R1	33.519 D-R1	23.568 D-R1
13	Spectrum 14H	David H Livingston Jr	FF	85	1:32.421 D-R1	1:31.983	1:33.339 D-Q2	1:32.421 D-R1	1:32.983 D-R1	+1.136 D-R1	131.1 D-R1	35.020 D-R1	33.218 D-R1	23.745 D-R1
14	Mygale F1600	Karsten Defonce	FF	82	1:32.554 D-R1	1:31.822	1:33.839 D-Q2	1:32.554 D-R1	1:33.047 D-R1	+1.288 D-R1	131.7 D-R1	35.080 D-R1	33.193 D-R1	23.549 D-R1
15	Mygale F1600	Jake Leroy	FF	03	1:32.585 A-R1	1:32.045	1:33.176 A-Q2	1:32.585 A-R1	1:33.093 A-R1	+1.221 A-R1	126.9 A-R1	34.841 A-R1	33.570 A-R1	23.634 A-R1
16	Piper DF-5	Michael Bulzacchelli	FF	93	1:32.974 D-R1	1:32.652	1:34.842 D-Q2	1:32.974 D-R1	1:33.799 D-R1	+1.588 D-R1	129.3 D-R1	35.258 D-R1	33.608 D-R1	23.786 D-R1
17	Piper DL7/Honda	Antonio Costantino	FF	3	1:33.448 C-R2	1:33.279	1:34.562 C-Q1	1:33.448 C-R2	1:34.331 C-R2	+1.947 C-R2	119.9 C-Q1	35.684 C-R2	33.691 C-R2	23.904 C-R2
18	Piper DL7	Camryn Reed	FF	09	1:33.999 D-Q2	1:33.717	1:33.999 D-Q2	1:34.531 D-R1	1:35.195 D-R1	+0.903 D-R1	128.6 D-R1	35.955 D-Q2	33.767 D-R1	23.995 D-R1
19	Piper DL7/Honda	Calum Dunbar	FF	12	1:34.054 C-R2	1:33.559	1:35.208 C-Q1	1:34.054 C-R2	1:35.082 C-R2	+1.807 C-R2	122.0 C-R2	35.895 C-R2	33.551 C-R2	24.113 C-R2
20	Caterham Seven	Peter Norton	EP	50, 150	1:34.415 B-R2	1:34.105	1:35.116 B-Q2	1:34.415 B-R2	1:36.168 B-R2	+2.172 B-R2	129.1 D-Q1	36.424 B-R2	33.493 B-R2	24.188 B-R2
21	Mygale F1600	Axel Leroy	FF	75	1:34.544 A-R1	1:33.706	1:35.075 A-Q2	1:34.544 A-R1	1:35.585 A-R1	+1.219 A-R1	127.3 A-Q2	35.730 A-R1	33.981 A-Q2	23.995 A-Q2
22	Citation F1600	Miles Crabbe	FF	8	1:34.549 A-P	1:34.164	1:34.876 A-Q2	1:35.412 A-R1	1:36.482 A-R1	+1.687 A-R1	125.2 A-R1	35.861 A-P	34.169 A-R1	24.134 A-Q2
23	Mygale SJ13	Ken Bouquillon	FF	83	1:34.710 D-R1	1:34.392	1:35.276 D-Q2	1:34.710 D-R1	1:34.985 D-R1	+2.767 D-R1	129.0 D-R1	36.452 D-R1	33.810 D-Q2	24.130 D-R1
24	Mygale GR	Michael Dowden	FF	01	1:34.904 C-Q1	1:34.379	1:34.904 C-Q1	1:35.211 C-R2	1:35.816 C-R2	+1.248 C-R2	116.8 C-R1, C-R2	36.056 C-R2	34.048 C-R2	24.275 C-Q1
25	Van Diemen RF02	Kevin Brumbaugh	FF	86	1:35.150 D-R1	1:35.029	1:36.770 D-Q2	1:35.150 D-R1	1:36.506 D-R1	+1.745 D-R1	129.5 D-Q2	36.763 D-R1	33.720 D-R1	24.546 D-Q2
26	BMW Z3	Tyler Ladd	EP	151	1:35.300 B-Q2	1:34.994	1:35.300 B-Q2	1:35.659 B-R2	1:36.433 B-R2	+1.539 B-R2	127.2 B-R2	36.908 B-Q2	33.687 B-R2	24.399 B-Q2
27	Piper DL7\Honda	Brian Graham	FF	2	1:36.474 D-R1	1:36.051	1:36.690 D-Q2	1:36.474 D-R1	1:37.329 D-R1	+1.345 D-R1	125.6 D-R1	36.711 D-Q2	34.537 D-R1	24.803 D-R1
28	Mazda MX-5	Tony Ave	EP	28	1:36.492 A-R1	1:36.269	1:36.760 A-Q1	1:36.492 A-R1	1:37.640 A-R1	+1.245 A-R1	125.6 A-R1	36.889 A-Q1	34.788 A-P	24.592 A-R1
29	Spectrum 014H	Sam Lockwood	FF	70	1:37.862 A-Q2	1:37.435	1:37.862 A-Q2	1:38.186 A-R1	1:39.431 A-R1	+2.126 A-R1	122.9 A-Q2	37.748 A-Q2	34.842 A-Q2	24.845 A-Q2
30	BMW 328is	Bill Miller	EP	47	1:38.553 B-R2	1:38.126	1:40.619 B-Q2	1:38.553 B-R2	1:39.953 B-R1	+1.312 B-R1	129.0 B-R2	38.663 B-R1	34.089 B-R2	25.374 B-R2
31	BMW 325M-Technic	David Spillman	EP	136	1:38.814 D-R2	1:38.794	1:41.100 D-Q2	1:38.814 D-R2	1:40.184 D-R2	+3.868 D-R2	136.0 D-R1	39.364 D-R2	34.359 D-R2	25.071 D-R2
32	BMW Z3	Doug Piner	EP	06	1:38.941 B-R2	1:38.256	1:39.293 D-Q2	1:38.941 B-R2	1:39.617 B-R2	+1.550 B-R2	132.3 D-Q2	38.639 B-R2	34.342 C-R2	25.275 C-R2
33	Alfa Romeo Spider	John Baucom	EP	86	1:39.735 B-R2	1:39.414	1:40.731 C-Q2	1:39.735 B-R2	1:40.858 B-R2	+2.452 B-R2	120.4 B-R2	38.674 B-R2	35.484 B-R2	25.256 B-R2
34	Mazda RX-7	Sean Saggese	EP	148	1:40.833 C-R2	1:40.330	1:41.750 C-Q2	1:40.833 C-R2	1:41.477 C-R2	+1.713 C-R2	120.1 C-R2	38.946 C-Q2	35.692 C-R2	25.692 C-R2
35	Mazda Miata	Don Tucker 2+ cars	EP	8, 9	1:41.011 C-R2	1:39.718	1:41.023 C-Q2	1:41.011 C-R2	1:41.626 D-R1	+1.117 D-R1	124.7 D-R1	39.189 D-R1	35.131 C-R2	25.398 C-Q2
36	Swift DB-3	Dan Carney	FF	44	1:41.600 C-R1	1:41.600	1:52.195 C-Q1	1:41.600 C-R1	1:47.375 C-R2	+2.695 C-R2	114.0 C-R1	41.271 C-R2	36.720 C-R2	27.511 C-R1
37	Mazda RX-8	Thomas Burt 2+ cars	EP	0	1:41.732 A-R1	1:41.218	1:44.257 A-Q1	1:41.732 A-R1	1:43.124 A-R1	+2.077 A-R1	124.9 A-Q1	39.184 A-R1	36.277 A-Q1	25.757 A-R1
38	Mazda RX-7	Thomas Burt 2+ cars	EP	0	1:42.289 B-R2	1:42.186	1:43.400 B-Q1	1:42.289 B-R2	1:43.641 B-R2	+2.129 B-R2	111.8 B-Q1	38.995 B-R2	37.095 B-R2	26.096 B-R2
39	BMW Z3	Don Tucker 2+ cars	EP	9	1:42.884 A-R1	1:42.072	1:43.056 A-Q1	1:42.884 A-R1	1:45.729 A-R1	+3.851 A-R1	125.0 A-R1	39.963 A-Q1	35.835 A-Q1	26.274 A-R1
40	Mazda RX-7 Roadster	Michael Cooke	EP	17	1:43.939 D-Q1	1:43.633	1:43.939 D-Q1	1:49.636 D-R2	1:50.440 D-R2	+2.830 D-R2	117.2 D-Q1	39.882 D-Q1	37.142 D-Q1	26.609 D-Q1
41	Mazda MX-5	Riley Salyer	EP	44	1:44.088 D-R1	1:44.088	1:45.352 D-Q2	1:44.088 D-R1	1:44.979 D-R1	+1.853 D-R1	109.8 D-R1	39.254 D-R1	38.249 D-R1	26.585 D-R1
42	BMW 325 i	Matthew Fritz	EP	14	1:44.365 D-R1	1:43.355	1:44.651 D-Q2	1:44.365 D-R1	1:44.945 D-R1	+1.199 D-R1	124.5 D-R1	40.272 D-R1	36.758 D-R1	26.325 D-R1
43	Mazda RX-7	John Bell	EP	162	1:47.624 C-Q1	1:47.213	1:47.624 C-Q1	1:49.368 C-R2	1:50.426 C-R2	+1.521 C-R2	113.9 C-Q1	42.828 C-Q1	36.727 C-Q1	27.658 C-Q1

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. Best 5-lap stint is the mean of the driver's quickest five consecutive race laps, and consistency is how far their median race lap sat behind their best in that race (small is a driver who does it every lap); both come 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.

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.

By car

Car	Class	Drivers	Lap	Qual	Race	Trap	S1	S2	S3
Piper DF05	FF	1	1:31.000Porter Aiken	1:31.000Porter Aiken	1:31.797Porter Aiken	130.3Porter Aiken	34.534Porter Aiken	33.016Porter Aiken	23.450Porter Aiken
Mygale SJ14H	FF	1	1:31.059Robert Albani	1:35.262Robert Albani	1:31.059Robert Albani	135.6Robert Albani	33.334Robert Albani	33.590Robert Albani	23.945Robert Albani
Swift DB6	FF	1	1:31.242John Robinson II	1:32.097John Robinson II	1:31.242John Robinson II	134.3John Robinson II	34.930John Robinson II	32.498John Robinson II	23.467John Robinson II
Van Diemen RF00	FF	1	1:31.334Chris Smith	1:34.065Chris Smith	1:31.334Chris Smith	134.3Chris Smith	34.806Chris Smith	32.940Chris Smith	23.427Chris Smith
Mygale SJ13	FF	2	1:31.374Sebastian Mateo Naranjo	1:31.374Sebastian Mateo Naranjo	1:31.587Sebastian Mateo Naranjo	133.1Sebastian Mateo Naranjo	34.756Sebastian Mateo Naranjo	32.943Sebastian Mateo Naranjo	23.399Sebastian Mateo Naranjo
Van Dieman F1600	FF	2	1:31.412Joe Colasacco	1:32.745Joe Colasacco	1:31.412Joe Colasacco	134.5Joe Colasacco	34.483Joe Colasacco	32.731Joe Colasacco	23.512Joe Colasacco
Van Dieman FF	FF	1	1:31.412Joe Colasacco	1:32.745Joe Colasacco	1:31.412Joe Colasacco	134.5Joe Colasacco	34.483Joe Colasacco	32.731Joe Colasacco	23.512Joe Colasacco
Van Dieman F1600	FF	1	1:32.266Trevor Russell	1:34.162Trevor Russell	1:32.266Trevor Russell	130.5Trevor Russell	34.751Trevor Russell	33.519Trevor Russell	23.568Trevor Russell
Mygale SJ14\Honda	FF	1	1:31.421Callum Baxter	1:32.506Callum Baxter	1:31.421Callum Baxter	135.8Callum Baxter	34.649Callum Baxter	32.985Callum Baxter	23.531Callum Baxter
Mygale F1600	FF	5	1:31.562Dillon Defonce	1:32.437David Ybarra	1:31.562Dillon Defonce	134.3Dillon Defonce	34.482Dillon Defonce	32.966Dillon Defonce	23.323Dillon Defonce
Mygale GR	FF	2	1:31.574Ely Navarro	1:31.621Ely Navarro	1:31.574Ely Navarro	130.3Ely Navarro	34.547Ely Navarro	33.192Ely Navarro	23.573Ely Navarro
Mygale SJ2014	FF	1	1:32.019Sebastian Mateo Naranjo	1:32.019Sebastian Mateo Naranjo	1:32.061Sebastian Mateo Naranjo	119.9Sebastian Mateo Naranjo	34.874Sebastian Mateo Naranjo	33.156Sebastian Mateo Naranjo	23.547Sebastian Mateo Naranjo
Spectrum 14H	FF	1	1:32.421David H Livingston Jr	1:33.339David H Livingston Jr	1:32.421David H Livingston Jr	131.1David H Livingston Jr	35.020David H Livingston Jr	33.218David H Livingston Jr	23.745David H Livingston Jr
Piper DF-5	FF	1	1:32.974Michael Bulzacchelli	1:34.842Michael Bulzacchelli	1:32.974Michael Bulzacchelli	129.3Michael Bulzacchelli	35.258Michael Bulzacchelli	33.608Michael Bulzacchelli	23.786Michael Bulzacchelli
Piper DL7/Honda	FF	4	1:33.448Antonio Costantino	1:33.999Camryn Reed	1:33.448Antonio Costantino	128.6Camryn Reed	35.684Antonio Costantino	33.551Calum Dunbar	23.904Antonio Costantino
Piper DL7/Honda	FF	2	1:33.448Antonio Costantino	1:34.562Antonio Costantino	1:33.448Antonio Costantino	122.0Calum Dunbar	35.684Antonio Costantino	33.551Calum Dunbar	23.904Antonio Costantino
Piper DL7	FF	1	1:33.999Camryn Reed	1:33.999Camryn Reed	1:34.531Camryn Reed	128.6Camryn Reed	35.955Camryn Reed	33.767Camryn Reed	23.995Camryn Reed
Piper DL7\Honda	FF	1	1:36.474Brian Graham	1:36.690Brian Graham	1:36.474Brian Graham	125.6Brian Graham	36.711Brian Graham	34.537Brian Graham	24.803Brian Graham
Caterham Seven	EP	1	1:34.415Peter Norton	1:35.116Peter Norton	1:34.415Peter Norton	129.1Peter Norton	36.424Peter Norton	33.493Peter Norton	24.188Peter Norton
Citation F1600	FF	1	1:34.549Miles Crabbe	1:34.876Miles Crabbe	1:35.412Miles Crabbe	125.2Miles Crabbe	35.861Miles Crabbe	34.169Miles Crabbe	24.134Miles Crabbe
Van Diemen RF02	FF	1	1:35.150Kevin Brumbaugh	1:36.770Kevin Brumbaugh	1:35.150Kevin Brumbaugh	129.5Kevin Brumbaugh	36.763Kevin Brumbaugh	33.720Kevin Brumbaugh	24.546Kevin Brumbaugh
BMW Z3	EP	3	1:35.300Tyler Ladd	1:35.300Tyler Ladd	1:35.659Tyler Ladd	132.3Doug Piner	36.908Tyler Ladd	33.687Tyler Ladd	24.399Tyler Ladd
Mazda MX-5	EP	2	1:36.492Tony Ave	1:36.760Tony Ave	1:36.492Tony Ave	125.6Tony Ave	36.889Tony Ave	34.788Tony Ave	24.592Tony Ave
Spectrum 014H	FF	1	1:37.862Sam Lockwood	1:37.862Sam Lockwood	1:38.186Sam Lockwood	122.9Sam Lockwood	37.748Sam Lockwood	34.842Sam Lockwood	24.845Sam Lockwood
BMW 328is	EP	1	1:38.553Bill Miller	1:40.619Bill Miller	1:38.553Bill Miller	129.0Bill Miller	38.663Bill Miller	34.089Bill Miller	25.374Bill Miller
BMW 325M-Technic	EP	1	1:38.814David Spillman	1:41.100David Spillman	1:38.814David Spillman	136.0David Spillman	39.364David Spillman	34.359David Spillman	25.071David Spillman
Alfa Romeo Spider	EP	1	1:39.735John Baucom	1:40.731John Baucom	1:39.735John Baucom	120.4John Baucom	38.674John Baucom	35.484John Baucom	25.256John Baucom
Mazda RX-7	EP	4	1:40.833Sean Saggese	1:41.750Sean Saggese	1:40.833Sean Saggese	120.1Sean Saggese	38.946Sean Saggese	35.692Sean Saggese	25.692Sean Saggese
Mazda RX-7	EP	3	1:40.833Sean Saggese	1:41.750Sean Saggese	1:40.833Sean Saggese	120.1Sean Saggese	38.946Sean Saggese	35.692Sean Saggese	25.692Sean Saggese
Mazda RX-7 Roadster	EP	1	1:43.939Michael Cooke	1:43.939Michael Cooke	1:49.636Michael Cooke	117.2Michael Cooke	39.882Michael Cooke	37.142Michael Cooke	26.609Michael Cooke
Mazda Miata	EP	1	1:41.011Don Tucker	1:41.023Don Tucker	1:41.011Don Tucker	124.7Don Tucker	39.189Don Tucker	35.131Don Tucker	25.398Don Tucker
Swift DB-3	FF	1	1:41.600Dan Carney	1:52.195Dan Carney	1:41.600Dan Carney	114.0Dan Carney	41.271Dan Carney	36.720Dan Carney	27.511Dan Carney
Mazda RX-8	EP	1	1:41.732Thomas Burt	1:44.257Thomas Burt	1:41.732Thomas Burt	124.9Thomas Burt	39.184Thomas Burt	36.277Thomas Burt	25.757Thomas Burt
BMW 325 i	EP	1	1:44.365Matthew Fritz	1:44.651Matthew Fritz	1:44.365Matthew Fritz	124.5Matthew Fritz	40.272Matthew Fritz	36.758Matthew Fritz	26.325Matthew Fritz

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

Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta → Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta 2023-03-10 to 2024-03-08

2023-04-01 EP Investigate Parity of Z3

#33343 from Tim Schreyer · Rule change · TB 23-01 (2023-01 Fastrack)

Summary

slowerEP BMW Z3 2.5L intake restrictor reduced from 58mm to 56mm flat plate.

As printed in Fastrack

Effective 4/1/2023 In EP Spec Line BMW Z3 2.5L, change Notes as follows:
"58 56mm Flat Plate Intake Restrictor is required with both stock or alternate throttle body."

2023-06-01 EP 914-6 Valve Size Correction

#34185 from Kip VanSteenburg · Rule change · TB 23-06 (2023-05 Fastrack)

Summary

fasterEP Porsche 914-6 2.0L intake valves increase to 2.0 mm, exhaust valves corrected to 38.0 mm.

As printed in Fastrack

In EP Spec Lines, Porsche 914 - 6 2.0L, change Valves IN & EX mm/(in.) as follows:
"(I) 4~~1.9~~ 2.0/(1.65)
(E) 38.1 0/(1.50)"

2023-07-01 EP Correct Intake Valve Size on 1500cc Midget/Spitfire

#34419 from Production Committee · Rule change · TB 23-06 (2023-05 Fastrack)

Summary

wordingFP and HP Sprite, Midget, and Spitfire 1500 intake valve size corrected to 36.6/(1.44).

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) 36.6~~5.3~~/(1.44)"
In FP Spec Lines, Triumph Spitfire Mk. IV & 1500, change Intake Valve Size as follows:
"(I) 36.6~~5.5~~/(1.440)"
In HP Spec Lines, Triumph Spitfire 1500, change Intake Valve Size as follows:
"(I) 36.6~~5.5~~/(1.440)"
In HP Spec Lines, Triumph Spitfire Mk. III & IV 1500, change Intake Valve Size as follows:
"(I) 36.6~~5.5~~/(1.440)"

2023-09-01 EP Hub Note Clean Up In EP TR8 Spec Line

#34649 from Jeff young · Rule change · TB 23-09 (2023-09 Fastrack)

Summary

wordingEP Triumph TR8 78-81 removes alternate front hub allowance note; stock hubs now required.

As printed in Fastrack

In the EP Spec Lines, Triumph TR8 (78-81), remove the following wording from Notes:
"~~Alternate front hubs are allowed provided they are of the same external dimensions as stock and weigh no less than the stock~~
~~hubs.~~"

2023-09-01 EP Triumph GT6 Adjustments

#34662 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)

Summary

unclearEP Triumph GT6 carburetors change from SU or Stromberg to 1.5" Auto-type.

As printed in Fastrack

In EP Spec Lines, Triumph GT6, change Carburetor. No. & Type as follows:
"(2) 1.5” ~~SU or Stromberg~~ Auto-type carburetor(s)"

2023-09-01 EP Triumph GT6 Adjustments: Brakes

#34663 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)

Summary

wordingEP Triumph GT6 brakes may now use TR-6 standard or alternate calipers and discs.

As printed in Fastrack

In EP Spec Lines, Triumph GT6, add the following to Brakes Alt.: mm/(in.):
"(F) Calipers & discs from TR-6 (std. or alt)"

2023-12-01 EP Porsche 944/924S Rule Change Request

#35002 from Adam Achepohl · Rule change · TB 23-12 (2023-12 Fastrack)

Summary

cars addedEP Porsche 944/924S combines 2.5L and 2.7L variants with new weights: 2250–2415 lbs depending on engine and year.

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.

2023-12-01 EP Triumph GT6 Adjustments

#35054 from ANTHONY PARKER · Rule change · TB 23-12 (2023-12 Fastrack)

Summary

fasterEP Triumph GT6 minimum weight reduced to 1800 lbs.

As printed in Fastrack

In EP Spec Lines, Triumph GT6, change weight as follows:
"~~1830~~ 1800"

2024-01-01 EP Request to Review Z3 2.5 Spec Line

#35073 from Tim Schreyer · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

slowerEP BMW Z3 2.5L weight increases to 2500 lbs, 2563 lbs with turbo, 2625 lbs with supercharger.

As printed in Fastrack

In EP spec line, BMW Z3 2.5L, change weight as follows:
"~~2450~~ 2500
*~~2511~~ 2563
**~~2573~~ 2625"

Applies to BMW Z3 on this page: Tyler Ladd, Doug Piner, Don Tucker

2024-01-01 EP Miata Alternate Head

#35253 from Don Tucker · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

fasterEP Mazda MX-5 1.8L 1990-97 minimum weight drops to 2150 lbs; 1994-97 variants to 2000, 2050, 2100 lbs respectively.

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"

Applies to Mazda MX-5 on this page: Tony Ave, Riley Salyer

Applies to Mazda Miata on this page: Don Tucker

2024-01-01 EP Triumph GT6 Adjustments

#35255 from Anthony Parker · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

fasterEP Triumph GT6 dual 1.75" carbs weight drops to 1940 lbs; triple Weber 40 DCOE options consolidated.

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 individual~~
~~runner manifold @ 2020 lb.~~"

2024-01-01 EP Honda S2000 throttle body

#35272 from Aaron Johnson · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

fasterEP 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."

2024-01-01 FF Honda Fit Oversize Piston Rings

#35305 from Doug Learned · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

wordingFF Honda Fit gains Fast Forward FF800-100 oversize piston ring pack option.

As printed in Fastrack

In FF, GCR section 9.1.1.B.14.e.3.a, add the following:
"The standard ring pack, PN 13011-RB1-004 (Riken) or 13011-RB1-006 (Nippon), or the oversize ring pack, PN 13021-RB7-Z01
(Riken), or 13021-RB7-Z02 (Nippon), or FF800-100 (Fast Forward), may be used."

2024-01-01 EP Correction within Triumph TR8 Spec Line

#35315 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

wordingEP Triumph TR8 dry sump allowance moved from carburetor line to notes section.

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.”

2024-01-01 EP Correction to EP 924S/944 Spec Line

#35317 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

wordingEP Porsche 944/924S 2.5L and 2.7L weight minimums 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.

2024-02-01 EP Update 1988-1991 Civic to Match 1988-1991 CRX

#35399 from Enrik Benazic · Rule change · TB 24-02 (2024-01 Fastrack)

Summary

fasterHP Honda Civic 1.5 (88-91) weight reduced to 2175 lbs base, 2229 lbs with power adder, 2284 lbs with two.

As printed in Fastrack

In HP, make the following weight change:
Honda Civic 1.5 (88-91)
~~“2245~~ 2175
*~~2301~~ 2229
**~~2357~~ 2284”

2024-03-01 EP GCR Correction - Redundant HP Spec Lines

#35623 from Production Committee · Rule change · TB 24-03 (2024-03 Fastrack)

Summary

wordingHP removes four redundant VW spec lines: Rabbit Cabriolet 1780, Scirocco 1588, Scirocco 1780 8-valve, 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

Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta → Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta 2024-03-08 to 2025-03-07

2024-06-01 EP NIssan 300ZX Z31 to EP

#35830 from Murphy Nichols · Rule change · TB 24-06 (2024-06 Fastrack)

Summary

cars addedNissan 300ZX 84-89 classified to EP at 2550 lbs minimum, 2960cc 6-cyl SOHC, fuel injection, 12.0:1 compression limit, 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.

2024-06-01 EP RX7 1993 and Up Request In EP Spec Lines, classify

#36031 from Edward Zabinski · Rule change · TB 24-06 (2024-06 Fastrack)

Summary

cars addedMazda RX-7 92-97 newly classified EP Prep Level 2 at 2200–2310 lbs with 13B 6-port rotary engine.

As printed in Fastrack

Mazda RX-7 (92-97) as follows:

A specification table follows in the original; it is not shown here.

2024-06-01 EP Clean-up Multiple EP RX-8 Spec Lines In EP

#36156 from Production Committee · Rule change · TB 24-06 (2024-06 Fastrack)

Summary

wordingEP Mazda RX-8 (04-11) alternate spec line removed; one primary line remains.

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.

2024-08-01 EP Errant entry in HP production line item

#36231 from Angus Crome · Rule change · TB 24-08 (2024-08 Fastrack)

Summary

wordingHP Volkswagen Golf and Jetta 85-92 track correction: front 1537mm (60.5in), rear 1529mm (60.2in).

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)"

2024-10-01 FF Update to FF EGR Blanking Plate Rule

#36633 from Matt Boian · Rule change · TB 24-10 (2024-10 Fastrack)

Summary

wordingFF VTEC activation valve must function; EGR blanking plate rule clarified with Fast Forward part numbers.

As printed in Fastrack

In FF, GCR section 9.1.1.B.14.r.1, change as follows:
"All emission control devices must be removed and blocked off by the blanking plate provided by HPD or Fast Forward as noted
below, except for the VTEC activation valve. The VTEC activation valve must be retained; and it must be functioning. No
modifications are permitted.
a. EGR Plate: Fast Forward PN: FF200-301.
b. EGR Port Cover: Fast Forward PN: FF200-302."

2024-11-01 EP 1275 HP Spridget Level 2 Only

#36518 from Darryl Saylor · Rule change · TB 24-09 (2024-09 Fastrack)

Summary

fasterHP Sprite and Midget 1275cc and 1098cc Level 2 compression ratio 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"

2024-11-01 FF Change FF/FC Weight with Sequential Gearbox

#36651 from Robert Wright · Rule change · TB 24-11 (2024-11 Fastrack)

Summary

fasterFF and FC cars with sequential gearbox must add 10 lbs. to minimum weight, down from 25 lbs.

As printed in Fastrack

In FF, GCR section 9.1.1.B.20.A.3, change as follows:
"Cars running with a sequentially shifted gear box ~~shall~~ must add 25 10 lbs. to minimum weight."
In FC, GCR section 9.1.1.B.20.B.4, change as follows:
"Cars running with a sequentially shifted gear box ~~shall~~ must add 25 10 lbs. to minimum weight."

2024-11-01 EP NA Miata Track Width Correction

#36902 from Production Committee · Rule change · TB 24-11 (2024-11 Fastrack)

Summary

wordingEP Mazda Miata front and rear track widths increased to 1516/1534 mm (59.7/60.4 in.) across all generations.

As printed in Fastrack

In EP Spec Lines, Track (F/R) mm/(in.), change as follows:
Mazda MX-5 /Miata 1.6L (-1993) - ~~"1478/1491 (58.2/58.7)~~ 1516/1534 (59.7/60.4)"
Mazda MX-5 /Miata 1.8L (90-97) - ~~"1483/1509 (58.4/59.4)~~ 1516/1534 (59.7/60.4)"
Mazda MX-5 /Miata (94-97) - "~~1483/1509 (58.4/59.4)~~ 1516/1534 (59.7/60.4)"

2024-11-01 FF Alternative Oversize Honda Fit Pistons

#37064 from Formula/Sports Racing Committee · Rule change · TB 24-11 (2024-11 Fastrack)

Summary

wordingFF Honda Fit allows Fast Forward 0.25mm oversize pistons PN FF800-110 as alternative; piston diameter spec clarified to 2.8835 inches.

As printed in Fastrack

In FF, GCR section 9.1.1.B.14.e.1, change as follows:
"Honda Fit OEM standard size pistons, PN: 13010-RB1-000, or Honda Fit OEM 0.25mm oversize pistons, PN: 13020-RB7-Z00, or
Fast Forward 0.25mm oversize pistons, PN: FF800-110, may be used."
In GCR section 9.1.1.B.14.e.2, change as follows:
"a. Maximum standard piston diameter, measured at a point 16mm from the bottom of the skirt: 73.240mm
(~~2.8834~~ 2.8835 inches).
b. Centerline of wrist pin to crown maximum: 26.21mm (1.032 inches).
c. Maximum overall height from skirt to crown edge: 47.80mm (1.882 inches).

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d. Minimum weight: 198.0 grams (6.984 ounces).
e. Minimum weight of piston pin: 66 grams (2.25 ounces).
f. Combined minimum weight of piston, piston pin and connecting rod: 543.5 grams (18.85 ounces).
g. Combined minimum weight of piston, wrist pin, and circlips: 267 grams (9.418 ounces).
h. Centerline of wrist pin to crown edge: 26.289mm (1.035 inches).
i. Ring groove widths:
Top ring groove: 1.003mm (0.0395 inches).
Middle ring groove: 1.016mm (0.0400 inches).
Oil ring groove: 1.981mm (0.0780 inches).
j. Ring groove distance from wrist pin center to bottom of groove:
Top ring groove: 19.63mm (0.7730 inches).
Middle ring groove: 15.29mm (0.6020 inches).
Oil ring groove: 10.91mm (0.4295 inches)."

2024-12-01 EP Triumph GT6 Adjustments

#37112 from Anthony Parker · Rule change · TB 24-12 (2024-12 Fastrack)

Summary

slowerEP Triumph GT6 switches to three Weber 40 DCOE carbs with 28mm chokes, weight rises 50 lbs to 1990.

As printed in Fastrack

In EP Spec Lines, make the following changes in the "Triumph GT6" spec line:
Carburetor No. & Type: (2): "~~1.5”~~ 1.75" Auto-type carburetor(s)"
Notes: "~~Two (2) 1.75” auto-type carburetors @ 1940 lbs.~~ Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive."

2025-01-01 EP 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)

Summary

fasterEP BMW 325i/is E30 (84-91) weight reduced 50–52 lbs across three spec lines to 2150, 2204, 2258.

As printed in Fastrack

In EP SPEC LINES, BMW 325i/is (E30) (84-91), change Weight as follows:
"~~2200~~ 2150
*~~2255~~ 2204
**~~2310~~ 2258"

Applies to BMW 328is on this page: Bill Miller

2025-02-21 EP Effective date for Jan 2025 GCR updates

#37654 from Doug Piner · Rule change · TB 25-02 (2025-02 Fastrack)

Summary

slowerEP BMW Z3 2.5L requires 52mm flat plate intake restrictor; Z3 2.8L 55mm; 328i/is E36 58mm; 328i/ci E46 58mm; 325i/is E46 56mm; 325i/is 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."

2025-03-01 EP Request Competition Adjustment to BMW Z3 2.5L

#37120 from Tim Schreyer · Rule change · TB 25-01 (2025-01 Fastrack)

Summary

slowerEP BMW Z3 and 3-series models get smaller intake restrictors: Z3 2.5L to 52mm, Z3 2.8L to 55mm, 328i to 58mm, 325i to 56mm.

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."

2025-03-01 EP Interpretation of Production Rules on Mirrors

#37235 from Lawrence Slivinski · Rule change · TB 25-03 (2025-03 Fastrack)

Summary

wordingEP, FP, HP: interior or exterior mirrors meeting rule 9.3.36 now permitted.

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."

2025-03-01 EP Weight Reduction for Honda S2000

#37466 from Michael Unger · Rule change · TB 25-03 (2025-03 Fastrack)

Summary

fasterEP Honda S2000 1997cc base loses 75 lbs to 2375; 2157cc base loses 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.

2025-03-01 EP Mazda 1999 Miata 1.8L

#37488 from Joe Carr · Rule change · TB 25-03 (2025-03 Fastrack)

Summary

fasterEP Mazda MX-5/Miata 99-05 minimum weight drops to 2100 lbs, 2153 lbs with power adder, 2205 lbs with two adders.

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"

2025-03-01 FF Formula F Proposal to Invite Older Cars Via a Tire Rule Change

#37802 from Anthony Stefanelli · Rule change · TB 25-03 (2025-03 Fastrack)

Summary

fasterFF allows older cars with rocker arm or outboard suspension to use bias ply slicks or VFF tires instead of radials.

As printed in Fastrack

In FF, GCR section 9.1.1.B.10.e, change as follows:
"Formula F shall be limited to the following tires (front tires may not be used as rears):
Dries:
Front - Hoosier R60A Radial 43322 or F1600 Radial 43321 185/60R13
Rear - Hoosier R60A Radial 43327 or F1600 Radial 43326 205/60R13
Wets:
Front - Hoosier Wet or W3 Radial 44421 185/60R13
Rear - Hoosier Wet or W3 Radial 44426 205/60R13

Show 12 more lines

Alternatively, Formula F cars with rocker arm suspension (e.g., Swift DB1, 1987-90 Reynard) and/or outboard suspension on at
least one chassis end may use the following tires:
Dries:
Front - Hoosier H43130 R60A 20.0 x 6.0-13 or H43164 R60A 20.5 x 7.0-13 bias ply slick
Rear – Hoosier H43307 R60A 22.5 x 7.2-13 bias ply slick
Wets:
Radial wets listed above
or
Front - Hoosier 44165 135/545-13 VFF
Rear - Hoosier 44170 165/580-13 VFF
Front tires may not be used as rears, and tires may not be mixed, i.e., radial tires may not be mixed with bias ply slick tires, bias
ply slick tires may not be mixed with VFF tires, and radial tires may not be mixed with VFF tires."

Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta → Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta 2025-03-07 to 2026-03-06

2025-04-01 EP Request for Classification of Chevrolet Spark

#37755 from Kristian Smith · Rule change · TB 25-04 (2025-04 Fastrack)

Summary

cars addedChevrolet Spark 16-22 classified HP Pre at 1850 lbs minimum weight, fuel injected, 1399 cc.

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.

2025-04-01 EP Request to Lower Ford Festiva Minimum Weight to 1600 LBS

#37939 from Doug DeRonne · Rule change · TB 25-04 (2025-04 Fastrack)

Summary

fasterHP Ford Festiva 88-93 minimum weight drops to 1600 lbs, variants to 1640 and 1680 lbs; 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”."

2025-05-01 FF Page 228, FF tire rule 9.1.1.10.e

#38251 from Anthony Stefanelli · Rule change · TB 25-05 (2025-05 Fastrack)

Summary

tyres & wheelsFF adds rocker arm and outboard suspension cars optional bias ply and VFF tires; removes front-as-rear rule, adds mixing restrictions.

As printed in Fastrack

In FF, GCR section 9.1.1.B.10.e, change as follows:
"Formula F shall be limited to the following tires ~~(front tires may not be used as rears)~~:
Dries:
Front - Hoosier R60A Radial 43322 or F1600 Radial 43321 185/60R13
Rear - Hoosier R60A Radial 43327 or F1600 Radial 43326 205/60R13
Wets:
Front - Hoosier Wet or W3 Radial 44421 185/60R13
Rear - Hoosier Wet or W3 Radial 44426 205/60R13

Show 16 more lines

Alternatively, Formula F cars with rocker arm suspension (e.g., Swift DB1, 1987-90 Reynard) and/or outboard suspension on at
least one chassis end may use the following tires:
Dries:
Front - Hoosier H43130 R60A 20.0 x 6.0-13 or H43164 R60A 20.5 x 7.0-13 bias ply slick
or
Hoosier 44165 135/545-13 VFF
Rear – Hoosier H43307 R60A 22.5 x 7.2-13 bias ply slick
or
Hoosier 44170 165/580-13 VFF
Wets:
Radial wets or VFF tires listed above
or
~~Front - Hoosier 44165 135/545-13 VFF~~
~~Rear - Hoosier 44170 165/580-13 VFF~~
Front tires may not be used as rears, and tires may not be mixed, i.e., radial tires may not be mixed with bias ply slick tires, bias
ply slick tires may not be mixed with VFF tires, and radial tires may not be mixed with VFF tires."

2025-06-01 EP Base Weight Adjustment for H-Production X1/9 Spec Lines

#38255 from Matthew Brannon · Rule change · TB 25-06 (2025-06 Fastrack)

Summary

fasterHP Fiat X-1/9 base weights reduced 50–53 lbs across 1300 and 1500 spec lines.

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”

2025-07-01 EP BMW Z4 update

#38490 from Bryce McGuire · Rule change · TB 25-07 (2025-07 Fastrack)

Summary

slowerEP BMW Z4 03-05 restricted to 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.”

2025-07-01 EP EP Fiat 124 Spider Competition Adjustment Request

#38498 from John Baucom · Rule change · TB 25-07 (2025-07 Fastrack)

Summary

fasterEP Fiat 124 Spider 1600 & 2000 weight drops 50 lbs to 2000; carburetors gain 2mm chokes to 36mm.

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."

2025-10-01 EP HP Plymouth Arrow spec omission

#38995 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

Summary

wordingHP Plymouth Arrow transmission max speeds clarified to 4 or 5.

As printed in Fastrack

In HP Spec Lines, Plymouth Arrow (76-80), add the following wording to Trans. Speeds(max):
"4 or 5"

2025-10-01 EP Add Wheel Diameter to Appendix G

#39008 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

Summary

wordingEP, FP, HP wheel diameter added to Appendix G as absolute maximum specification.

As printed in Fastrack

In Appendix G.2.3, change as follows:
"Rim width and diameter are is absolute maximums."

2025-10-01 EP Add TB ID tolerance to general Prod rules

#39009 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

Summary

wordingEP, FP, HP throttle body inside dimensions must remain stock with +/-.25mm tolerance; butterfly dimensions stock in FP, HP only.

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)."

2025-11-01 EP Please Lower Weight of 280Z

#38871 from Matthew Miller · Rule change · TB 25-09 (2025-09 Fastrack)

Summary

fasterEP Nissan 280Z minimum weight reduced from 2560 to 2400 lbs.

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"

2025-11-01 EP Miata Weight Adjustment Follow Up

#38949 from Don Tucker · Rule change · TB 25-10 (2025-10 Fastrack)

Summary

fasterEP Mazda MX-5 1.8L 90-97 weight reduced to 2125 lbs from 2150 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"

2025-11-01 EP Weight Break for 1098 Midget / Sprite

#38970 from Kendall Jones · Rule change · TB 25-10 (2025-10 Fastrack)

Summary

fasterHP Austin-Healey Sprite/Midget 1098cc minimum weight drops 80 lbs to 1550.

As printed in Fastrack

In HP Spec Lines, Austin-Healey Sprite/Midget 1098cc, Effective 11/1/2025make the following weight change:
"~~1630~~ 1550"

2025-11-01 EP HP Volvo 142 spec omission

#38994 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

Summary

slowerHP Volvo 142/142E gains compression ratio limit 12.0:1 and valve lift limit .425".

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”."

2025-11-01 EP HP Mini DOHC 1.6

#38996 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

Summary

slowerHP Mini Cooper 07-15 valve lift reduced 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"."

2025-11-01 EP Add to Rabbit description

#39019 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)

Summary

wordingFP and HP Volkswagen Rabbit descriptions updated: Convertible changed to Cabriolet in FP; Cabriolet added to three HP engine variants.

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)"

2025-11-01 EP Clean-up 9.1.5.E.7e

#39025 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)

Summary

wordingEP, FP, HP: rear drum brake to disc 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. N~~ote that 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 stock, from converting to rear~~
~~disc 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 and~~
~~alternate brake listings on a vehicle’s specification line, does not prohibit a car that was fitted with rear drum brakes as stock~~

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~~from 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."

2025-11-01 EP Add TB size to Ford Mustang (94-98) Spec Line

#39130 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)

Summary

wordingEP Ford Mustang (94-98) fuel injected throttle body inside diameter specified at 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"

2025-12-01 EP TR2 Notes E&O

#39180 from Anthony Parker · Rule change · TB 25-12 (2025-12 Fastrack)

Summary

unclearEP Triumph TR2-TR4A allows 5-speed gearbox without overdrive; removes Weber carb and weight specification.

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 @ 1990~~
~~lbs.~~ Laycock overdrive, may use 5 speed gearbox without overdrive."

2025-12-01 EP Balance of Power

#39187 from Jim Simaras · Rule change · TB 25-12 (2025-12 Fastrack)

Summary

slowerEP BMW Z3 2.5L restrictor reduced 52mm to 50mm, weight increased to 2550 lbs base; five other BMW models get smaller restrictors.

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"

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In EP Spec Lines, BMW Z3 2.5L, change Weight as follows:
"~~2500~~ 2550
*~~2563~~ 2614
**~~2625~~ 2678"

2026-01-01 FF Formula F Alternative Tire Rule Proposed Clarifications

#39281 from Jay Messenger · Rule change · TB 26-01 (2026-01 Fastrack)

Summary

wordingFF clarifies alternative tire eligibility for cars homologated 1989 or earlier with rocker arm or outboard suspension on all four corners.

As printed in Fastrack

In FF, GCR section 9.1.1.B.10.e, change as follows:
"Alternatively, Formula F cars ~~with rocker arm suspension (e.g., 1987-90 Reynard, Swift DB1,) and/or outboard suspension on at~~
~~least one chassis end~~ homologated in 1989 or earlier with any combination of rocker arm or outboard suspension on all four
corners (e.g., 1987 – 1990 Reynard, Swift DB1) may use the following alternative tires. Note: This rule is intended to allow older
cars with the described suspension design to use the alternative tires. It is not to be exploited by modifying cars with push-rods or
pull-rods to meet the above requirements or by modifying either end of older cars to push- or pull-rod suspension to be eligible to
run the alternative tires. Cars that were homologated in 1989 or earlier with push- or pull-rod suspension on no more than two
corners may seek approval to run the alternative tire by utilizing the compliance process outlined in GCR section 8.1.4."

2026-01-01 EP Request to Update E30 BMW Throttle Body Diameter Verbiage

#39363 from Tim Schreyer · Rule change · TB 26-01 (2026-01 Fastrack)

Summary

wordingEP BMW 325i/is E30 throttle body specified as 60mm in fuel injection notes.

As printed in Fastrack

In EP Spec Line BMW 325i/is E30 (84-91), change Drivetrain Notes as follows:
"Fuel Injection, TB: 60mm"

What the rules allowed changed as listed; this does not say what any particular car ran.