BoP Lab / Classes / PX
PX vs GT1 pace at every track
| Event | PX | GT1 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Qual best | Race best | Trap | Qual best | Race best | Trap | vs PX | |||
| Road America Runoffs 20262026-09-28 | 2:02.981Tony Ave · fastest of 12 · top 5 within 4.6s+1.708s (+1.41%) | 2:04.611Tony Ave · fastest of 12 · top 5 within 3.9s+0.553s (+0.45%) | 177.9Tony Ave-2.7 mph (-1.5%) | ||||||
9 rule changes (GT1: 9)5 cars added · 3 weight · 1 wording · GT1 Porsche T/A Cup renamed T/A Cup, retains 1-11/16 inch flat plate, must run T/A Cup rule set. · GT1 adds T/A Porsche Cup with 1-11/16 inch max flat plate, must run T/A Porsche Cup rule set. · GT1 Lamborghini Huracan Trofeo, Evo 2, Evo 3 added; all three allowed to compete at as-run weight. · GT1-ST Lamborghini Huracán GT3 (2019–) minimum weight reduced to 2950 lbs. · GT1 GM 275ci carbureted V6 minimum weight reduced to 2295 lbs. · GT3U class removed from GCR; GT3U cars now compete in STU. · GT1 adds Porsche 992.1 GT3 Cup 2022–2025 with OEM ABS, traction control, RSR bumper, canards, and any exhaust. · GT1-ST Acura NSX GT3 EVO 22 minimum weight drops 100 lbs to 3000. · Acura NSX GT3 EVO 22 reclassified from GT1 to GT1-ST, 3500cc, 3100 lbs minimum weight.show
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| Road America Runoffs 20252025-09-29 | 2:01.273Tony Ave · fastest of 14 · top 5 within 7.7s-1.262s (-1.03%) | 2:04.058Tony Ave · fastest of 12 · top 5 within 5.8s-2.835s (-2.23%) | 180.6Dave Ruehlow-0.4 mph (-0.2%) | ||||||
7 rule changes (GT1: 7)3 cars added · 1 engine · 1 induction · 1 wording · 1 other · GT1 LS Limited Prep engine expanded to include LS2, LS3, LS6 alongside LS1; compression ratio capped at 11:1. · Acura NSX GT3 EVO 22 classified in GT1 with 3500cc twin turbo crossflow V-6, 3100 lbs, 7500 rpm max. · GT1 LS1 Limited Prep engine added, 2600 lbs with driver, 383 cubic inches maximum, hydraulic roller cam, 750 cfm carb. · TA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof height limit. · GT1-ST restrictor specifications removed for 13 cars; new values not provided. · GT1-ST Lamborghini Huracán GT3 Evo and GT3 both move to unrestricted intake, replacing 39mm and 52mm restrictors. · GT1 Mazda 26B engine approved; minimum weight set to 2850 lbs.show
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| Road America Runoffs 20242024-10-01 | 2:02.535Dave Ruehlow · fastest of 10 · top 5 within 4.6s-0.401s (-0.33%) | 2:06.893Dave Ruehlow · fastest of 6 · top 5 within 50.8s+1.611s (+1.29%) | 181.0Dave Ruehlow+0.5 mph (+0.3%) | ||||||
8 rule changes (GT1: 8)3 engine · 1 aero · 1 cars added · 1 weight · 2 wording · GT2-ST Acura NSX minimum weight rises to 3000 lbs, restrictor increases to 45mm TIR. · GT1 Camaro 1993-2002 model years specified in GCR 9.1.2.E.1.b.3. · GT1-GTX rear blade spoiler: angle 50–75°, max 59.0 wide by 5.0 high inches; total area limit removed. · GT1, GT2, GT3, GTL, GTX Direct Injection now permitted if original equipment. · GT2 Nissan and GT3 Mazda, Mitsubishi 4G93, Nissan QR25DE/DD, QE25DE/DD now permit Direct Injection per 9.1.2.F.7.5.E. · GT1-ST adds Lamborghini Huracan GT3 EVO(1) 2018- at 3000 lbs, X39mm restrictor, and Huracan GT3 2019- at 3100 lbs, 52mm restrictor. · GT1 Trick Flow Specialties Ultra 18 Degree GM Cylinder Head Part #TFS-3181T001-CO1 allowed. · GTL spec lines moved contiguous with GT2 and GT3; GTA category and specs renumbered behind GTL; P2 engine tables reorganised with restrictor and weight specifications clarified.show
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| Virginia International Raceway Runoffs 20232023-09-23 | 1:48.203David Pintaric · fastest of 5 · top 5 within 22.4s+1.395s (+1.31%) | 178.1David Pintaric-3.6 mph (-2.0%) | |||||||
7 rule changes (GT1: 7)3 weight · 2 cars added · 2 wording · Fields Cardinal V8 added to GT1 with Ford V8 engine, 4.9L, 2100 lbs, fuel injection. · GT1 Mercedes AMG GT3 16-19 notes clarify FIA GT3 homologation compliance. · GT1 sequential transmission weight penalty reduced from 50 lbs to 25 lbs. · GT1-ST Porsche 992 GT3 Cup added with 3997cc displacement, 2950 lb minimum weight, no restrictor. · GT2 TA2 and GTA throttle body part numbers updated to GM 12570790 or Edelbrock 33869/3870. · GT1 Trans Am bodywork weight penalty reduced from 100 lbs to 75 lbs. · GT1 Chevrolet RO7, Ford FR9, and Dodge R7 weight penalties cut from 50 lbs to 25 lbs each.show
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| Virginia International Raceway Runoffs 20222022-09-24 | 1:46.808David Pintaric · fastest of 8 · top 5 within 3.7s+2.951s (+2.84%) | 2:18.094David Pintaric · fastest of 7 · top 5 within 13.7s+29.532s (+27.20%) | 181.7Adam Romito-1.5 mph (-0.8%) | ||||||
6 rule changes (GT1: 6)3 cars added · 2 tyres & wheels · 1 wording · GT1, GT2, GT3, GTL, GTX tail lights may now be original style or custom panel graphic with functioning red LED brake lamps. · GT1 allows current Trans Am bodywork with 100 lb weight penalty. · GT1 Mercedes Benz AMG GT3 added, 3050 lbs, 6208cc V8, 40mm restrictors, FIA GT3 homologation. · GT1 wheel width limits change: 12in front/13in rear standard, 18in wheels get 13in front/14in rear maximum. · GT1 allows 17-inch wheels; 18-inch wheels now permitted with 50 lb penalty; 18-inch tyres use 13-inch front, 14-inch rear width. · GT3 Volkswagen Fun Cup Beetle EVO3 classified, sealed SOHC 1984cc engine, 2060 lbs minimum weight.show
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| Indianapolis Motor Speedway Runoffs 20212021-09-25 | 1:35.279Michael Lewis · fastest of 20 · top 5 within 0.6s-0.729s (-0.76%) | 1:53.220David Pintaric · fastest of 14 · top 5 within 3.8s+17.033s (+17.71%) | 180.2Tom Smith | ||||||
1 rule change (GT1: 1)1 wording · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two locations and 6010 to 6014X in TA2 Appendix.show
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| Road America Runoffs 20202020-10-02 | 2:02.936Ernie Francis Jr · fastest of 16 · top 5 within 3.4s | 2:05.282Ernie Francis Jr · fastest of 16 · top 5 within 3.4s | 180.5Simon Gregg | ||||||
12 rule changes (GT1: 12)4 cars added · 2 weight · 5 wording · 1 other · GT1/GT2/GT3/GTL/GTX turbocharging and supercharging now permitted if listed on spec line. · GT1 adds Trans Am spec engines: Chevrolet R07, Ford FR9, Dodge R7, each at base weight plus 50 lbs. · TA2 Gurney flap wording clarified: replace 'wicker bill' and 'wicker' with 'Gurney flap' throughout wing specifications. · STO rear wing rules clarify that wicker is called Gurney flap in two places; no performance change. · GT1 Gurney flap and wickerbill terminology clarified: 'lips' and 'tabs' and 'wicker' standardized to 'flaps' throughout section D and E. · GT Gurney flap wording clarified: wickerbill and tab terminology replaced with Gurney flap throughout sections 9.1.2.F.7.b. · GT1, GT2, GT3, GTL, GTX may use bonded-glass factory windshields without clips or straps if attached per original specifications. · GT2/ST Ford Coyote 5.0L third generation OEM gains Boss intake manifold option at 3200 lbs minimum. · GTX Misc. adds Factory Five Type 65 Coupe R Ford 302/351 and 5.0/5.2L NA at 2600 lbs, plus Ferrari 458/488 Challenge, Ford FP350S, Chevrolet C6, Lamborghini Super Trofeo. · GT1 sequential shifting transmissions weight penalty reduced from 75 lbs to 50 lbs. · GT1 cars not specified for 18 inch wheels now have 50 pound penalty, down from 100. · GT1 adds 5 Star NASCAR Camaro 2018 and later body as allowed bodywork option.show
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| Virginia International Raceway Runoffs 20192019-10-05 | 1:43.857Tony Ave · fastest of 12 · top 5 within 3.9s | 1:48.562Tony Ave · fastest of 11 · top 5 within 11.4s | 183.2Tony Ave | ||||||
6 rule changes (GT1: 6)2 cars added · 1 aero · 1 engine · 1 wording · 1 other · GT1 Porsche 944/968 added: 2981cc twin-turbo four, 2585 lbs minimum weight. · GT1 allows Trans Am rear wing, 72" span, 12" chord, 1/2" wicker, 100 sq in endplates, no weight penalty; front undertray allowed with 50 lb penalty. · GTX tube frame cars now allowed fuel injection with maximum 90mm throttle body. · GTX adds Ligier JS2 R classification with restrictor and minimum weight. · GT1 and GT2/3/Lite remove ride height ground clearance rules; cars may now touch ground when tires deflate. · GTX FIA GT3: Audi R8 now 40 mm restrictor and 2900 lbs; BMW Z4 now 70 mm restrictor and 2800 lbs; Ferrari 488 now 35 mm restrictor, TIR, and 3025 lbs.show
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| Sonoma Raceway Runoffs 20182018-10-10 | 1:35.673Michael Lewis · fastest of 8 · top 5 within 7.1s | 1:37.516Michael Lewis · fastest of 7 · top 5 within 5.3s | 111.6Preston Calvert | ||||||
| No rule changes on record between these events | |||||||||
| Indianapolis Motor Speedway Runoffs 20172017-09-25 | 1:36.008David Pintaric · fastest of 17 · top 5 within 2.2s | 1:36.187Cliff Ebben · fastest of 16 · top 5 within 1.5s | |||||||
| No rule changes on record between these events | |||||||||
| Mid-Ohio Sports Car Course Runoffs 20162016-09-19 | 1:21.927Cliff Ebben · fastest of 8 · top 5 within 2.5s | 1:22.866Michael Lewis · fastest of 7 · top 5 within 2.1s | |||||||
| No rule changes on record between these events | |||||||||
| Daytona International Speedway Runoffs 20152015-09-21 | 1:44.244Michael Lewis · fastest of 11 · top 5 within 7.8s | 1:47.116Michael Lewis · fastest of 7 · top 5 within 8.3s | |||||||
By track
| Track | Events |
|---|---|
| Road America | 4 |
| Virginia International Raceway | 3 |
| Indianapolis Motor Speedway | 2 |
| Daytona International Speedway | 1 |
| Mid-Ohio Sports Car Course | 1 |
| Sonoma Raceway | 1 |
About this data
Every event the class ran, at any track, oldest to newest on the chart and newest first in the table. Each point is the class's best lap as a share of the reference class's best on the same day: the weather and the day cancel out, so one figure compares across years where lap times cannot; a class that suits one track more than another still reads differently there. It still moves when the yardstick's own balance changes or its field thins, and an event the yardstick did not run has no point. A best from fewer than three cars is greyed. The rule changes that took effect between two events are folded between their rows.