GT3 Requesting Increase in Choke Diameter for Mazda 12A Bridgeport
#27043 from Guy Laidig · Rule change · TB 19-09 (2019-09 Fastrack)
In GT3, Mazda 12A Bridge Port, add to the notes as follows:
"Optional choke size 42mm @2010lbs."
BoP Lab / Drivers / Guy Laidig
Guy Laidig 1 letter to Fastrack
Against the front of the class, by track and class
| Track | Class | Sessions | Typical gap to class best | Closest |
|---|---|---|---|---|
| Portland International Raceway (1.88 mi) | GT2 | 4 | +11.989s (15.49%) | +11.989s (15.49%) |
| Buttonwillow Raceway Park (2.57 mi) | GT2 | 11 | +7.394s (7.04%) | +3.313s (3.08%) |
| Buttonwillow Raceway Park (2.95 mi) | GT3 | 10 | +3.125s (2.81%) | +0.000s (0.00%) |
| Virginia International Raceway (3.27 mi) | GT3 | 4 | +8.766s (7.36%) | +7.445s (6.26%) |
| Portland International Raceway (1.98 mi) | GT3 | 4 | +6.043s (7.52%) | +5.079s (6.37%) |
| Sonoma Raceway (2.52 mi) | GT3 | 4 | +8.373s (8.28%) | +7.004s (6.82%) |
| Unknown track (2.52 mi) | GT3 | 2 | +13.136s (12.96%) | +13.136s (12.96%) |
| Mid-Ohio Sports Car Course (2.26 mi) | GT3 | 6 | +6.095s (6.66%) | +5.997s (6.60%) |
| Daytona International Speedway (3.56 mi) | GT3 | 5 | +4.293s (3.51%) | +3.276s (2.65%) |
Gap is the driver's best lap in a session against the fastest lap in their class in that same session (zero is fastest in class), shown as time lost and as a share of the lap, so conditions cancel out and tracks can be compared. Typical is the median session.
Portland International Raceway (1.88 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oregon 2026 | Grp 4 GT1 GT2 GTX T1 T2 AS Race 2 | GT2 | 52 | Mazda RX-7 | 5/4 | 1:15.111Brad Mcallister | |||||
| Oregon 2026 | Grp 4 GT1 GT2 GTX T1 T2 AS Qual 2 | GT2 | 52 | Mazda RX-7 | 5/4 | 1:14.401Brad Mcallister | |||||
| Oregon 2026 | Grp 4 GT1 GT2 GTX T1 T2 AS Race 1 | GT2 | 52 | Mazda RX-7 | 5/5 | 2:00.444 | 1:14.249Brad Mcallister | +46.195s (62.22%) | 124.85/5 | 152.5Brad Mcallister | -27.7 mph (-18.2%) |
| Oregon 2026 | Grp 4 GT1 GT2 GTX T1 T2 AS Qual 1 | GT2 | 52 | Mazda RX-7 | 4/4 | 1:29.385 | 1:17.396Matthew Butson | +11.989s (15.49%) | 128.64/4 | 148.1Matthew Butson | -19.6 mph (-13.2%) |
Buttonwillow Raceway Park (2.57 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cal Club 2026 | Grp 7 GT1 GT2 GTX T1 T2 AS Race 2 | GT2 | 52 | Mazda RX-7 | 7/8 | 1:52.486 | 1:45.092Tim Carroll | +7.394s (7.04%) | 133.75/8 | 149.2Rocky Crocker | -15.5 mph (-10.4%) |
| Cal Club 2026 | Grp 7 GT1 GT2 GTX T1 T2 AS Qual 2 | GT2 | 52 | Mazda RX-7 | 4/6 | 1:51.013 | 1:47.700Ben Valentine | +3.313s (3.08%) | 131.33/6 | 152.1Rocky Crocker | -20.9 mph (-13.7%) |
| Cal Club 2026 | Grp 7 GT1 GT2 GTX T1 T2 AS Race 1 | GT2 | 52 | Mazda RX-7 | 5/8 | 1:53.560 | 1:44.128Tim Carroll | +9.432s (9.06%) | 134.65/8 | 153.8Rocky Crocker | -19.1 mph (-12.5%) |
| Cal Club 2026 | Grp 7 GT1 GT2 GTX T1 T2 AS Qual 1 | GT2 | 52 | Mazda RX-7 | 6/7 | 1:51.184 | 1:42.698Tim Carroll | +8.486s (8.26%) | 138.75/7 | 155.7Rocky Crocker | -17.0 mph (-10.9%) |
| Cal Club 2026 | Grp D Practice | GT2 | 52 | Mazda RX-7 | 3/5 | 1:51.317 | 1:44.487Tim Carroll | +6.830s (6.54%) | 132.24/5 | 152.8Rocky Crocker | -20.7 mph (-13.5%) |
| Cal Club 2025 | Grp 7 GT1 GT2 GTX T1 T2 AS Race 2 | GT2 | 52 | Mazda RX-7 | 5/4 | 1:48.046Brad McAllister | |||||
| Cal Club 2025 | Grp 7 GT1 GT2 GTX T1 T2 AS Qual 2 | GT2 | 52 | Mazda RX-7 | 5/4 | 1:45.818Brad McAllister | |||||
| Cal Club 2025 | Grp 7 GT1 GT2 GTX T1 T2 AS Race 1 | GT2 | 52 | Mazda RX-7 | 6/6 | 2:00.199 | 1:46.926Brad McAllister | +13.273s (12.41%) | 95.05/6 | 107.2Brad McAllister | -12.3 mph (-11.5%) |
| Cal Club 2025 | Grp 7 GT1 GT2 GTX T1 T2 AS Qual 1 | GT2 | 52 | Mazda RX-7 | 3/6 | 1:53.244 | 1:47.144Ben Valentine | +6.100s (5.69%) | 117.91/6 | 117.9you | +0.0 mph (0.0%) |
| Cal Club 2025 | Group D | GT2 | 52 | Mazda RX-7 | 5/7 | 1:58.597 | 1:48.980Ben Valentine | +9.617s (8.82%) | 103.71/6 | 103.7Ben Valentine | +0.0 mph (0.0%) |
| Cal Club 2025 | Fri AM | GT2 | 52 | Mazda RX-7 | 2/2 | 1:52.542 | 1:47.663Ben Valentine | +4.879s (4.53%) | 107.72/2 | 116.9Ben Valentine | -9.3 mph (-7.9%) |
Buttonwillow Raceway Park (2.95 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park | Grp 1 GT3,STL,STU,T2,T3,T4 Race 2 | GT3 | 2 | Mazda RX-7 | 4/11 | 1:54.285 | 1:51.160Michael Lewis | +3.125s (2.81%) | 135.05/11 | 138.1Michael Lewis | -3.0 mph (-2.2%) |
| Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park | Grp 1 GT3,STL,STU,T2,T3,T4 Race 1 | GT3 | 2 | Mazda RX-7 | 4/11 | 1:56.402 | 1:54.646Michael Lewis | +1.756s (1.53%) | 126.911/11 | 139.3Taz Harvey | -12.4 mph (-8.9%) |
| Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park | Grp 1 GT3,STL,STU,T2,T3,T4 Qual 2 | GT3 | 2 | Mazda RX-7 | 10/8 | 1:50.937Michael Lewis | |||||
| Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park | Grp 1 GT3,STL,STU,T2,T3,T4 Qual 1 | GT3 | 2 | Mazda RX-7 | 3/8 | 1:55.609 | 1:53.249Michael Lewis | +2.360s (2.08%) | 123.67/8 | 137.5Taz Harvey | -13.9 mph (-10.1%) |
| Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park | Grp 1 GT3,STL,STU,T2,T3,T4 Practice | GT3 | 2 | Mazda RX-7 | 1/7 | 1:55.472 | 1:55.472you | +0.000s (0.00%) | 133.33/7 | 138.1Taz Harvey | -4.8 mph (-3.5%) |
| Hoosier SCCA Super Tour (Cal Club Region) | Grp 6 GT1,GT2,GT3,AS,T1 Race 2 | GT3 | 52 | Mazda RX-7 | 4/10 | 2:00.376 | 1:54.680Michael Lewis | +5.696s (4.97%) | 117.27/10 | 122.3Mike Henderson | -5.1 mph (-4.2%) |
| Hoosier SCCA Super Tour (Cal Club Region) | Grp 6 GT1,GT2,GT3,AS,T1 Race 1 | GT3 | 52 | Mazda RX-7 | 9/10 | 1:59.814 | 1:55.331Michael Lewis | +4.483s (3.89%) | 118.87/10 | 121.9Michael Lewis | -3.2 mph (-2.6%) |
| Hoosier SCCA Super Tour (Cal Club Region) | Grp 6 GT1,GT2,GT3,AS,T1 Qual 2 | GT3 | 52 | Mazda RX-7 | 7/10 | 1:59.196 | 1:51.873Michael Lewis | +7.323s (6.55%) | 118.66/10 | 122.7Michael Lewis | -4.1 mph (-3.3%) |
| Hoosier SCCA Super Tour (Cal Club Region) | Grp 6 GT1,GT2,GT3,AS,T1 Qual 1 | GT3 | 52 | Mazda RX-7 | 8/7 | 1:54.164Michael Lewis | |||||
| Hoosier SCCA Super Tour (Cal Club Region) | Grp 6 GT1,GT2,GT3,AS,T1 Prac | GT3 | 52 | Mazda RX-7 | 4/8 | 2:00.056 | 1:53.967Mike Henderson | +6.089s (5.34%) | 118.14/8 | 121.9Mike Henderson | -3.9 mph (-3.2%) |
Virginia International Raceway (3.27 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Runoffs 2019 | GT3 Race | GT3 | 52 | Mazda RX-7 | 16/16 | 2:07.811 | 1:59.045Tony Ave | +8.766s (7.36%) | 136.612/16 | 149.6Jeff Dernehl | -13.0 mph (-8.7%) |
| Runoffs 2019 | GT3/GTL Qual 3 | GT3 | 52 | Mazda RX-7 | 11/17 | 2:06.360 | 1:58.915Tony Ave | +7.445s (6.26%) | 137.19/17 | 148.3Jeff Dernehl | -11.2 mph (-7.6%) |
| Runoffs 2019 | GT3 Qual 2 | GT3 | 52 | Mazda RX-7 | 17/16 | 1:58.194Michael Lewis | |||||
| Runoffs 2019 | GT3/GTL Qual 1 | GT3 | 52 | Mazda RX-7 | 14/15 | 2:18.301 | 1:59.610Jeff Dernehl | +18.691s (15.63%) | 131.412/15 | 147.0Jeff Dernehl | -15.6 mph (-10.6%) |
Portland International Raceway (1.98 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Hoosier SCCA Super Tour (Oregon Region) | Grp 4 GT1,GT2,GT3,GTX,AS,T1 Race 2 | GT3 | 52 | Mazda RX-7 | 3/3 | 1:24.828 | 1:19.749Collin Jackson | +5.079s (6.37%) | 130.03/3 | 135.1Collin Jackson | -5.2 mph (-3.8%) |
| Hoosier SCCA Super Tour (Oregon Region) | Grp 4 GT1,GT2,GT3,GTX,AS,T1 Qual 2 | GT3 | 52 | Mazda RX-7 | 3/2 | 1:20.139Collin Jackson | |||||
| Hoosier SCCA Super Tour (Oregon Region) | Grp 4 GT1,GT2,GT3,GTX,AS,T1Race 1 | GT3 | 52 | Mazda RX-7 | 3/3 | 1:26.429 | 1:20.386Collin Jackson | +6.043s (7.52%) | 129.43/3 | 134.5Collin Jackson | -5.1 mph (-3.8%) |
| Hoosier SCCA Super Tour (Oregon Region) | Grp 4 GT1,GT2,GT3,GTX,AS,T1Qual 1 | GT3 | 52 | Mazda RX-7 | 3/3 | 1:28.555 | 1:20.607Gary Bockman | +7.948s (9.86%) | 128.22/3 | 135.1Gary Bockman | -7.0 mph (-5.2%) |
Sonoma Raceway (2.52 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Runoffs 2018 | GT3 Race | GT3 | 52 | Mazda RX-7 | 7/8 | 1:49.638 | 1:42.634Michael Lewis | +7.004s (6.82%) | 102.88/8 | 111.4Collin Jackson | -8.6 mph (-7.7%) |
| Runoffs 2018 | GT3 Qual 3 | GT3 | 52 | Mazda RX-7 | 8/10 | 1:49.455 | 1:41.082Collin Jackson | +8.373s (8.28%) | 101.28/10 | 115.7Collin Jackson | -14.6 mph (-12.6%) |
| Runoffs 2018 | GT3 Qual 2 | GT3 | 52 | Mazda RX-7 | 7/9 | 1:49.595 | 1:40.947Michael Lewis | +8.648s (8.57%) | 103.45/9 | 114.2Collin Jackson | -10.9 mph (-9.5%) |
| Runoffs 2018 | GT3 Qual 1 | GT3 | 52 | Mazda RX-7 | 7/8 | 1:49.671 | 6.403Larry Hansen | +103.268s (1612.81%) | 102.05/8 | 115.5Collin Jackson | -13.5 mph (-11.7%) |
Unknown track (2.52 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Runoffs 2018 | Sun Grp 1 Run 4 | GT3 | 52 | Mazda RX-7 | 2/2 | 1:54.493 | 1:41.357Collin Jackson | +13.136s (12.96%) | |||
| Runoffs 2018 | Sun Grp 1 Run 3 | GT3 | 52 | Mazda RX-7 | 3/3 | 2:01.524 | 1:42.268Collin Jackson | +19.256s (18.83%) |
Mid-Ohio Sports Car Course (2.26 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Runoffs 2016 | GT3 Race | GT3 | 52 | Mazda RX-7 | 8/14 | 1:37.130 | 1:31.107Joe Kristensen | +6.023s (6.61%) | |||
| Runoffs 2016 | GT3 Qual 4 | GT3 | 52 | Mazda RX-7 | 11/12 | 1:36.794 | 1:30.797Gary Bockman | +5.997s (6.60%) | |||
| Runoffs 2016 | GT3 Qual 3 | GT3 | 52 | Mazda RX-7 | 11/12 | 1:37.631 | 1:31.536Joe Kristensen | +6.095s (6.66%) | |||
| Runoffs 2016 | GT3 Qual 2 | GT3 | 52 | Mazda RX-7 | 13/14 | 1:39.852 | 1:31.750Joe Kristensen | +8.102s (8.83%) | |||
| Runoffs 2016 | AS Qual 1 | GT3 | 52 | Mazda RX-7 | 1 | ||||||
| Runoffs 2016 | GT3 Qual 1 | GT3 | 52 | Mazda RX-7 | 12/13 | 1:42.768 | 1:32.584Joe Kristensen | +10.184s (11.00%) |
Daytona International Speedway (3.56 mi)
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Runoffs 2015 | GT3 Race | GT3 | 52 | SFR | 7/10 | 2:06.893 | 2:03.617Joe Kristensen | +3.276s (2.65%) | |||
| Runoffs 2015 | GT3/STU/T2 Qualifying 4 | GT3 | 52 | SFR | 7/9 | 2:07.790 | 2:02.194Joe Kristensen | +5.596s (4.58%) | |||
| Runoffs 2015 | GT3/STU/T2 Qualifying 3 | GT3 | 52 | SFR | 7/3 | 2:15.556Joe Kristensen | |||||
| Runoffs 2015 | GT3/STU/T2 Qualifying 2 | GT3 | 52 | SFR | 6/11 | 2:06.462 | 2:02.169Joe Kristensen | +4.293s (3.51%) | |||
| Runoffs 2015 | GT3/STU/T2 Qualifying 1 | GT3 | 52 | SFR | 6/10 | 2:07.870 | 2:01.736Joe Kristensen | +6.134s (5.04%) |