BoP Lab / Classes / GT2

GT2 vs AS vs P2 pace at every track

Lap times across years say as much about the weather as the class. % of GT2 is each class's best lap as a share of GT2's on the same day, so the conditions drop out: 100% is level, less is quicker, and a move in it is the class getting faster or slower against the field.

Class · click a class to switch, + to compare alongside (up to 4)

vsAS ×B-Spec +EP +FA +FC +FE2 +FF +FP +FV +FX +GT1 +GT2×GTX +HP +P +vsP2 ×SM +SMX +SRF3 +STL +STU +T1 +T2 +T3 +T4 +Show 51 inactive classes

Series Runoffs Super Tour Both

Reference · what % is measured against

Tracks · untick to narrow Auto Club Speedway Barber Motorsports Park Blackhawk Farms Raceway Buttonwillow Raceway Park Circuit of St. Louis (formerly Gateway Motorsports Circuit of the Americas Daytona International Speedway Grattan Raceway Hallett Motor Racing Circuit Homestead-Miami Speedway Indianapolis Motor Speedway Laguna Seca Michelin Raceway Road Atlanta Mid-Ohio Sports Car Course New Jersey Motorsports Park NOLA Motorsports Park Pacific Raceways Pittsburgh International Race Complex Portland International Raceway Pueblo Motorsports Park Road America Sebring International Raceway Sonoma Raceway Summit Point Raceway Thunderhill Raceway Park Virginia International Raceway Watkins Glen International Willow Springs Raceway World Wide Technology Raceway

Closest to the field: GT2 100.0% of GT2 Jordan Bupp, Daytona International Speedway Runoffs 2015 race · AS 89.6% of GT2 Gregory Eaton, Indianapolis Motor Speedway Runoffs 2021 race · P2 77.2% of GT2 Tim Day Jr, Indianapolis Motor Speedway Runoffs 2021 race

% of GT2Lap times

GT2ASP2solid race · dashed qualifying · slower is lower

GT2ASP2solid race · dashed qualifying · each class's best lap as a share of GT2's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	GT2			AS					P2
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs GT2	% of GT2	Qual best	Race best	Trap	vs GT2	% of GT2
	Road America Runoffs 20262026-09-28	2:09.634John Atwell · fastest of 18 · top 5 within 4.3s-2.173s (-1.65%)	2:10.650John Atwell · fastest of 18 · top 5 within 4.1s-2.797s (-2.10%)	163.0Jack Stanford-0.3 mph (-0.2%)	2:26.911Andrew McDermid · fastest of 8 · top 5 within 3.4s+0.119s (+0.08%)	2:28.471Andrew McDermid · fastest of 8 · top 5 within 2.4s-0.761s (-0.51%)	151.0Andrew McDermid-0.6 mph (-0.4%)	+17.821squal +17.277s	113.6%qual 113.3%	2:10.606Greg Gyann · fastest of 11 · top 5 within 5.3s+3.201s (+2.51%)	2:09.441Mike Reupert · fastest of 11 · top 5 within 4.2s+1.119s (+0.87%)	155.0Matt Strand+2.4 mph (+1.6%)	-1.209squal +0.972s	99.1%qual 100.7%
26 rule changes (GT2: 13, AS: 13)7 weight · 4 engine · 4 tyres & wheels · 3 cars added · 2 induction · 2 removed · 4 othershowhide 2026-09-01 AS 2016+ Camaro Spec Line Full Prep #39646tyres & wheels 2026-09-01 AS Consideration of Pirelli P Zero Trofeo Track for AS Competition #40495tyres & wheels 2026-08-01 AS Change in 9.1.6.D.4.d.5 in Suspension Mounting Points #40094other 2026-08-01 AS Re-Add 4.6L 4v 96-04 Mustang Cobra #40239weight 2026-08-01 AS Errors and Omissions #40532weight 2026-06-01 AS Clarification for LM7 Holley Carburetor #40167engine 2026-05-01 GT2 Panoz Esperante GTS Letter ID Number: #38494 - Additional Info #38584tyres & wheels 2026-05-01 GT2 Appendix L Update #39923tyres & wheels 2026-05-01 GT2 GT2 Porsche 997.2 GT3 Cup EDIT #40125other 2026-04-01 AS Header Information Update for EFI Engine Build Sheets #39886engine 2026-04-01 AS Errors and Omissions #39933weight 2026-04-01 GT2 Corvette C7 (14-19) L76 Specline Errors/Missing Changes #39838weight -100 lbs 2026-04-01 GT2 GT2 Porsche 997.2 GT3 Cup #39936weight 2026-03-01 AS Re-Organization of AS Spec lines for 2026 #39887removed 2026-03-01 GT2 Classification Request - Ginetta G56 GT4 (V8) #39625cars added 2026-03-01 GT2 Remove GT3U from GCR as it is now in STU #39862removed 2026-03-01 GT2 Audi R8 GT4 remove spec line notes #39864other 2026-02-01 AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight 2026-02-01 GT2 Allow Larger Air Cooled Engines in Porsche 911 GT2 #39249engine 2026-02-01 GT2 Classify T1 BMW in GT2 #39408cars added 2026-01-01 AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction 2026-01-01 GT2 Additional Body Options to Replace Older Stock Car Bodies #39086other 2026-01-01 GT2 GT3 Turbo to GT2? #39365induction 2026-01-01 GT2 Tech Bulletins for GT2 and GT2-ST #39537cars added -100 lbs 2025-12-01 AS 1994 Mustang Spec Line Request #39104engine 2025-11-01 AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
	Road America Runoffs 20252025-09-29	2:11.807Brad McAllister · fastest of 16 · top 5 within 3.4s-0.053s (-0.04%)	2:13.447John Atwell · fastest of 13 · top 5 within 3.6s+0.136s (+0.10%)	163.3Charlie Peter-1.0 mph (-0.6%)	2:26.792Andrew McDermid · fastest of 11 · top 5 within 3.9s+0.214s (+0.15%)	2:29.232Gregory Eaton · fastest of 10 · top 5 within 4.0s+2.803s (+1.91%)	151.5Andrew McDermid+1.9 mph (+1.3%)	+15.785squal +14.985s	111.8%qual 111.4%
19 rule changes (GT2: 7, AS: 11, P2: 1)6 engine · 5 weight · 3 aero · 3 induction · 1 cars added · 1 othershowhide 2025-08-01 GT2 Rear Deck Lid for Older Air-Cooled Porsche #38506aero 2025-07-01 AS RE: Previous Letter 37695 Update #38245weight -75 lbs 2025-06-01 AS Errors and Omissions #38234engine 2025-05-01 AS Errors and Omission #38055induction 2025-05-01 AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO #38197engine 2025-04-01 AS Flotek Head Plunge Cut Inconsistencies #37502other 2025-04-01 AS Notes clean up #37693weight 2025-03-01 AS Race memo #37902engine 2025-03-01 GT2 Hood Bulge allowed #37000engine 2025-03-01 GT2 OEM Wing Adjustment #37590aero 2025-02-01 GT2 GT2/ST - Remove Aftermarket/Racing ABS penalty #36538weight 2025-01-01 AS Increase Coyote Engine Restrictor to 80mm #36177induction 2025-01-01 AS Performance Pack for 2015+ Mustang #36867weight 2025-01-01 AS Gear Ratios #37131engine 2025-01-01 AS ECU specs for LS engine #37208engine 2025-01-01 GT2 Panoz Esperante GTS BOP #36686cars added 2025-01-01 GT2 Correct language regarding OEM Areo Devices #37137aero 2025-01-01 GT2 GT2 Sunbeam Tiger Alternate Carburetor #37198induction 2024-12-01 P2 2000 cc Pinto Engine Car Weight #37187weight
	Road America Runoffs 20242024-10-01	2:11.860Charlie Peter · fastest of 23 · top 5 within 1.1s-0.438s (-0.33%)	2:13.311John Atwell · fastest of 23 · top 5 within 0.9s-0.968s (-0.72%)	164.3Jonathan Start+2.1 mph (+1.3%)	2:26.578Gregory Eaton · fastest of 18 · top 5 within 2.6s-0.467s (-0.32%)	2:26.429Gregory Eaton · fastest of 18 · top 5 within 2.5s-1.239s (-0.84%)	149.6Gregory Eaton+0.4 mph (+0.3%)	+13.118squal +14.718s	109.8%qual 111.2%	2:07.405Bart Wolf · fastest of 14 · top 5 within 3.0s-1.109s (-0.86%)	2:08.322Bart Wolf · fastest of 13 · top 5 within 0.6s-1.471s (-1.13%)	152.5Lucian Pancea-0.6 mph (-0.4%)	-4.989squal -4.455s	96.3%qual 96.6%
29 rule changes (GT2: 13, AS: 11, P2: 5)8 cars added · 7 engine · 4 weight · 2 induction · 2 tyres & wheels · 1 aero · 2 wording · 3 othershowhide 2024-09-01 AS Mustang transmission ratios #36662engine 2024-07-01 GT2 GT2-ST Rule Clarification #36093wording 2024-07-01 GT2 GT4 cars may run in GT2-ST #36235weight 2024-06-01 AS Request for Classification of 2018-2023 mustang In #35764cars added 2024-05-01 AS 6th gen Camaro limited prep #35733cars added 2024-05-01 AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK #35825cars added 2024-05-01 AS Full Prep Head #35891other 2024-05-01 GT2 Request for Spec Line 1010 Reconsideration #35009weight +300 lbs 2024-05-01 GT2 Request to Eliminate the FPR from the Corvette (-2013) with LS2 #35878induction 2024-05-01 P2 CN Spec ECU #35835engine 2024-05-01 P2 E&O - Correct FIA Group CN spec line notes #35900tyres & wheels 2024-04-01 AS Restricted Prep Aftermarket Parts Request #35682other 2024-04-01 AS Allowance of 11 #35824tyres & wheels 2024-03-01 AS Request to Classify 1970-1981 Camaro and Firebird in AS #33659cars added 2024-03-01 AS Fuel Cell 12 #34194other 2024-03-01 AS Please Classify the 6th Gen Into AS. #35448cars added 2024-03-01 AS spec lines #35713cars added 2024-03-01 GT2 Classify Corvette C8 (2020- ) into GT2/ST #33759cars added 2024-03-01 GT2 Requesting classification for a 2015 Mitjet ST in GT2 #35408cars added 2024-02-01 GT2 Rear Blade Spoiler Clarification #35261aero 2024-02-01 GT2 GT Direct Injection allowance and rules #35437engine 2024-02-01 GT2 REDUCE C6 CORVETTE WEIGHT WITH OEM 7 LITER ENGINE REDUCE BY 150LB #35385weight -150 lbs 2024-02-01 GT2 GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine 2024-01-01 GT2 Dodge Viper Gen 3 hybrid Kit Update Request #35200induction 2024-01-01 P2 E&O - Clarify B.1 modified engine range in AMAC spec lines #35225engine 2024-01-01 P2 Replacement Engine Crankcase for 07/08 Suzuki GSX-R1000 Engines #35340engine 2023-12-01 GT2 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight 2023-12-01 P2 Correct Table 1 for Engine Date Range Specifications #35182engine 2023-10-01 GT2 Late E & O #34966wording
	Virginia International Raceway Runoffs 20232023-09-23	1:52.004Barry Boes · fastest of 15 · top 5 within 1.6s+0.918s (+0.83%)	1:52.865Jared Odrick · fastest of 15 · top 5 within 1.0s-0.183s (-0.16%)	164.0Tom Patton-0.2 mph (-0.1%)	2:03.082Daniel Richardson · fastest of 11 · top 5 within 2.2s+0.920s (+0.75%)	2:04.120Gregory Eaton · fastest of 9 · top 5 within 3.0s-0.458s (-0.37%)	154.6James Jost+3.7 mph (+2.5%)	+11.255squal +11.078s	110.0%qual 109.9%	1:48.590Greg Gyann · fastest of 12 · top 5 within 1.7s+1.024s (+0.95%)	1:48.829Lucian Pancea · fastest of 11 · top 5 within 0.9s-27.005s (-19.88%)	150.9Lucian Pancea-0.2 mph (-0.2%)	-4.036squal -3.414s	96.4%qual 97.0%
31 rule changes (GT2: 19, AS: 4, P2: 8)8 induction · 7 weight · 6 engine · 3 cars added · 3 tyres & wheels · 2 aero · 1 suspension & brakes · 1 wordingshowhide 2023-09-01 GT2 GT2 Mazda 20B 3 rotor ENO #34765weight -220 lbs 2023-08-01 AS Crate Motor Part Numbers #32944engine 2023-08-01 AS Request wheel size change #33007tyres & wheels 2023-08-01 AS Alternative Upper Front Control Arms for Dodge Challenger #33352engine 2023-08-01 AS Front Brake Caliper Adapters for Dodge Challenger #33353suspension & brakes 2023-07-01 GT2 appendix letter #33635 #34206weight 2023-07-01 GT2 Remove Weight and Restrictor Penalty for Corvette C7 Body #34342weight 2023-05-01 GT2 Request to class 2011 Porsche Cayman S #33771cars added 2023-05-01 GT2 Please classify Fields Cardinal V8 #33784cars added 2023-05-01 P2 Clarify minimum side body height requirement #34143tyres & wheels 2023-05-01 P2 Clarify closed cockpit single seat car allowance #34144wording 2023-04-01 GT2 Adding Ginetta G56 GTA Factory ProTune for GT2 Class #33825engine 2023-04-01 P2 Remove redundant effective date language and update engine table #34012engine 2023-04-01 P2 E&O - Correct dimensional equivalents #34038weight 2023-02-01 GT2 GT2 Mazda 13B Turbo #33729induction 2023-01-01 GT2 Request Permission to Use a Substitute Turbo #33337induction 2023-01-01 GT2 Request to Reduce Restriction on C7 GT2 Corvette #33342induction 2023-01-01 GT2 Toyota 4A-F and 4A-FE 1.6L DOHC 16V Engine Request #33415engine 2023-01-01 GT2 GT2 Mazda 13b turbocharger part # update #33437induction 2023-01-01 GT2 GT2-ST BMW E36/46 spec line remove #33610aero 2023-01-01 GT2 GT3 Choke option effective 1-01-2023 #33669induction 2023-01-01 GT2 GT3 2.0L choke/weight option #33670weight 2023-01-01 GT2 BOP adjustment for GT2 & GT2-ST #33681induction 2023-01-01 P2 Request to Classify Sebeco NP01 #33378cars added 2023-01-01 P2 Radical spec line clarifications #33485weight 2023-01-01 P2 E&O original class intent #33519weight 2023-01-01 P2 Update Engine Table Spec Line B.1 #33608engine 2022-12-01 GT2 GT2 (TA2)/GTA Part Number Update #33315induction 2022-12-01 GT2 Ginetta G56 GTA - Optional Wheels #33357tyres & wheels 2022-11-01 GT2 Allow the MAShaw Body Kit on the GT2/ST Spec Line for BMW E36/E46 #32447aero 2022-10-01 GT2 Request for C5/C6 Corvette Restrictor Size Review #32982induction
	Virginia International Raceway Runoffs 20222022-09-24	1:51.086Andrew Aquilante · fastest of 23 · top 5 within 1.1s+0.904s (+0.82%)	1:53.048Daniel Bender · fastest of 17 · top 5 within 3.1s+0.573s (+0.51%)	164.2Scotty B White+1.4 mph (+0.9%)	2:02.162Kurt Rezzetano · fastest of 13 · top 5 within 2.3s-0.776s (-0.63%)	2:04.578Gregory Eaton · fastest of 11 · top 5 within 2.9s+0.678s (+0.55%)	150.9James Jost-3.0 mph (-2.0%)	+11.530squal +11.076s	110.2%qual 110.0%	1:47.566Tim Day Jr · fastest of 12 · top 5 within 3.0s-1.545s (-1.42%)	2:15.834Greg Gyann · fastest of 12 · top 5 within 10.1s+25.576s (+23.20%)	151.1Robert Iversen+1.8 mph (+1.2%)	+22.786squal -3.520s	120.2%qual 96.8%
33 rule changes (GT2: 14, AS: 9, P2: 10)5 cars added · 4 weight · 3 engine · 3 induction · 3 suspension & brakes · 3 tyres & wheels · 1 aero · 5 wording · 6 othershowhide 2022-09-01 AS Request to add Hoosier W2 #33031other 2022-09-01 AS correction of Dodge Challenger specification line #33151wording 2022-09-01 GT2 Tail lights on all GT category race cars. #32799suspension & brakes 2022-09-01 GT2 Addendum to letter #32514 Ginetta GTA G56 #33076cars added 2022-08-01 GT2 Information requested for carbon roofs on BMW E36/E46 cars in GT2 #32682wording 2022-08-01 GT2 Request to Allow the 95mm S54 BMW Crankshaft in GT2-ST #32698other 2022-08-01 GT2 Request to classify Audi R8 FIA GT4 to GT2 #32805cars added 2022-07-01 AS Request CTS-V Spec Line Error Correction #30242weight 2022-05-01 GT2 Typo in rules for shocks #32308suspension & brakes 2022-05-01 GT2 additional response to letters #31898 & 32083 #32424weight +140 lbs 2022-05-01 P2 E&O Clarification of Chassis Construction Requirements #32469tyres & wheels 2022-05-01 P2 Clean up P2 wording #32525wording 2022-04-01 P2 After Market to Aftermarket #32373other 2022-03-01 GT2 Request to Classify Ginetta G40 in GT2 #31597cars added 2022-03-01 GT2 2021 Supra GR GT4 #31737cars added 2022-03-01 GT2 Proposed Technical Bulletin #31900induction 2022-03-01 P2 Add spec line for Beasley B2 #32147weight 2022-03-01 P2 E&O Table 1 spec line wing terminology #32148aero 2022-03-01 P2 E&O class name #32196other 2022-02-01 GT2 GT2/ST Porsche Cayman #31451 correct TBR size error #31991wording 2022-02-01 P2 E&O Engine section #31969engine 2022-01-01 AS Proposed Revisions to SCCA GCR 2021 Appendix M, Part 3 #30295other 2022-01-01 AS specification line consolidation and correction #31846wording 2022-01-01 AS correction of SMG specification line #31847suspension & brakes 2022-01-01 AS Alternate cylinder heads for full prep engine builds - Evaluation #31851engine 2022-01-01 GT2 Restrictor Clarification for 2015 Cayman #31451induction 2022-01-01 P2 E&O letter #31539 – Control Area definition #31783tyres & wheels 2021-12-01 P2 BoP adjustment effective 1-1-22 #31538engine 2021-12-01 P2 E&O clarification of "Control Area" definition #31539tyres & wheels 2021-10-01 AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other 2021-10-01 AS Request Pontiac GTO tire size change #30881weight 2021-10-01 GT2 Turbo Request for 13B Engine #30656induction 2021-10-01 GT2 Request car classification #31032cars added
	Indianapolis Motor Speedway Runoffs 20212021-09-25	1:39.665Andrew Aquilante · fastest of 22 · top 5 within 1.8s-0.254s (-0.25%)	2:03.513Tim Kezman · fastest of 18 · top 5 within 9.6s+22.537s (+22.32%)	163.7Jonathan Start	1:50.427Drew Cattell · fastest of 31 · top 5 within 1.9s+5.207s (+4.95%)	1:50.606Gregory Eaton · fastest of 28 · top 5 within 1.7s-0.901s (-0.81%)	153.8James Jost	-12.907squal +10.762s	89.6%qual 110.8%	1:33.235Tim Day Jr · fastest of 16 · top 5 within 3.3s+1.409s (+1.53%)	1:35.322Tim Day Jr · fastest of 10 · top 5 within 4.8s+2.841s (+3.07%)	150.3Robert Iversen	-28.191squal -6.430s	77.2%qual 93.5%
38 rule changes (GT2: 16, AS: 14, P2: 8)12 weight · 11 engine · 5 cars added · 2 tyres & wheels · 1 induction · 3 wording · 4 othershowhide 2021-09-01 GT2 Correct letter 30565 GT2/ST #31088weight 2021-09-01 P2 P2 CN Engine Rebuild Clarification #31000engine 2021-08-01 GT2 Request the 04-06 Pontiac GTO WC Car Be Added to the GT2/ST Chart #30339cars added 2021-08-01 GT2 Request to Update GTA Obsolete Part Numbers #30615wording 2021-08-01 GT2 GTX class correction to GT2/ST #30973cars added 2021-08-01 P2 F5 P2 Conversion #30856other 2021-08-01 P2 Clarify minimum body width requirement #30859tyres & wheels 2021-07-01 GT2 Porsche Cayman Engine Modification and Engine Request #30472engine 2021-07-01 GT2 Request weight clarification Viper CC #30565weight 2021-07-01 GT2 Variance, 2021 TA2 Rules vs GCR Appendix L #30641weight 2021-06-01 AS Request CTS-V Spec Line Error Correction #30242weight 2021-06-01 AS Request to consolidate SN95 Mustang '94-'04 Mustang spec lines #30428cars added 2021-06-01 AS American Sedan Transmission Rule Change Request #30595weight 2021-06-01 AS Correction to specifications inadvertently deleted #30691wording 2021-06-01 AS weight adjustments #30700weight +50 lbs 2021-05-01 P2 E&O tonneau cover provision in cockpit opening section #30459other 2021-05-01 P2 Remove effective dates in Table 1 #30468other 2021-05-01 P2 E&O Maximum Valves Per Cylinder #30560engine 2021-04-01 GT2 GT2 tiger firing order #30421engine 2021-03-01 AS AS Mustang LP 4.6 3V Classification Transmission Request #29886weight 2021-03-01 AS Request CF driveshaft on CTS-V for durability improvement #30117engine 2021-03-01 AS Adjustment to model years of 5th generation RP Camaro #30348engine 2021-03-01 GT2 GT2-ST CORVETTE CHANGES #30029weight +100 lbs 2021-03-01 GT2 Request underfloor clarification #30121tyres & wheels 2021-03-01 GT2 29742 Change new wording to read as: #30329engine 2021-03-01 P2 Add a new spec line for a 2-cycle, 3-cylinder engine up to 820cc #30272engine 2021-02-01 GT2 ABS Restrictions #30064other 2021-02-01 GT2 RM 21-01 C6 & C7 clarification #30192weight 2021-01-01 AS Request for 2015 -2017 Ford Mustang Spec Line #29514cars added 2021-01-01 AS Request Trunk lid / Rear Hatch clarification #29591wording 2021-01-01 AS Common Weight for CTS-V Tire #29759weight 2021-01-01 AS Correction to specifications inadvertently deleted #30041cars added 2021-01-01 GT2 Request change to engine firing order rule #29742engine 2021-01-01 GT2 Request E-46 BMW M3 balance of performance #29833weight -100 lbs 2020-12-01 AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine 2020-12-01 AS Rule simplification spec line communization #29824weight 2020-12-01 GT2 Request for Bigger Engine in Plymouth Breeze #29380engine 2020-12-01 P2 Balance of Performance adjustments effective 01-01-2021 #29822induction
	Road America Runoffs 20202020-10-02	2:12.298Andrew Aquilante · fastest of 20 · top 5 within 2.9s	2:14.279Andrew Aquilante · fastest of 19 · top 5 within 2.4s	162.2Scotty B White	2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s	2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s	149.2Gregory Eaton	+13.389squal +14.747s	110.0%qual 111.1%	2:08.514Robert Iversen · fastest of 12 · top 5 within 3.0s	2:09.793Robert Iversen · fastest of 12 · top 5 within 3.9s	153.1Robert Iversen	-4.486squal -3.784s	96.7%qual 97.1%
48 rule changes (GT2: 26, AS: 16, P2: 6)9 weight · 8 engine · 8 induction · 6 aero · 5 cars added · 2 suspension & brakes · 2 tyres & wheels · 2 wording · 6 othershowhide 2020-10-01 GT2 rescind GT2 stock car bodies removal #29219other 2020-10-01 GT2 E&O Typos in Appendix L #29447wording 2020-10-01 GT2 GT2 wing width wording correction #29469aero 2020-09-01 GT2 GT Category Wording #29193induction 2020-09-01 GT2 Corvette GT2-ST intake manifold #29221induction 2020-09-01 GT2 997.2 E&O link to 27915 #29373other 2020-09-01 P2 E&O clarification of P2 rear wing requirements #29205aero 2020-08-01 AS Dodge Challenger AS Spec Line Clarification #28698induction 2020-08-01 AS Dodge Challenger AS Spec Line Clarification #2 #28699aero 2020-08-01 GT2 Request for allowance Trans Am SGT #28951weight 2020-08-01 GT2 Omitted GT2 fender/hood openings #29171other 2020-07-01 AS Support for R-Type Specification Tires #27450tyres & wheels 2020-07-01 AS Spec Tire Request #27519tyres & wheels 2020-07-01 AS Restrictor Plate Change for RP 2011+ Mustang with Coyote Engine #27675induction 2020-07-01 AS 2005-2009 Restricted Prep 4.6 3V #27908engine 2020-07-01 AS Request for 2005-2009 Restricted Prep 4.6 3V Parts #27909engine 2020-07-01 AS Request for Full Preparation Classification for 2010-2014 Camaro #28030other 2020-07-01 AS Cylinder Heads #28696engine 2020-07-01 AS Request for Max Rotor Diameter Change #28748suspension & brakes 2020-07-01 AS Request increase rotor diameter #28797other 2020-07-01 GT2 TA2 Gurney flap wicker clarification #28874aero 2020-07-01 GT2 STO Gurney flap wicker clarification #28883aero 2020-07-01 GT2 GT Gurney flap wicker clarification #28909aero 2020-06-01 GT2 Request to Adjust Weight of OEM 8.4 Viper #28739weight -50 lbs 2020-06-01 GT2 Request to Adjust Weight of OEM Chevrolet Corvette #28896weight -50 lbs 2020-06-01 P2 Classify Elan NP01 in P2 Table 1 #28812cars added 2020-05-01 AS weight adjustments for 2020 season #28785weight -50 lbs 2020-05-01 GT2 Request Corvette engine parity #28576engine 2020-05-01 P2 SCCA Enterprises ESR / P2 engine restrictor testing #28669induction 2020-04-01 GT2 Request to revisit Panoz GT-S BoP #28280engine 2020-04-01 GT2 GT2-ST Corvette LS2 & L76 #28583weight 2020-04-01 GT2 GT2-ST Corvette L76 #28584weight 2020-04-01 P2 Add ESR inlet restrictor #27869induction 2020-03-01 GT2 Request 991.2 Porsche engine displacement verify typo #28194engine 2020-03-01 P2 Request for Fly by Wire Rule Wording Change #28247engine 2020-02-01 AS Rear Trailing Arms #28007suspension & brakes 2020-02-01 AS Weight reduction for cars running iron heads #28010weight 2020-02-01 AS 05-10 Mustang with HR cam classification #28226cars added 2020-02-01 AS 10-15 Camaro Full Prep classification #28227cars added 2020-02-01 GT2 Windshield Clips #27323other 2020-02-01 GT2 Request to Add Chevrolet SS Body to Appendix L #27898wording 2020-01-01 GT2 Request Factory Five Daytona coupe classification #26308cars added 2020-01-01 GT2 Porsche 991.2 GT3 Cup GT2 Classification #27701cars added 2020-01-01 GT2 Request for Acura NSX Spec Line Changes #27755weight 2020-01-01 GT2 GT2 991.1 restrictor size change #27914induction 2020-01-01 GT2 GT2 996/997.1 weight change #27915weight -100 lbs 2020-01-01 GT2 GT2/ST Corvette comp adjustment #27920induction 2020-01-01 P2 Request for addition of BMW Engine in P2 Engine Table #27821engine
	Virginia International Raceway Runoffs 20192019-10-05	1:50.182Andrew Aquilante · fastest of 24 · top 5 within 4.5s	1:52.475Andrew Aquilante · fastest of 19 · top 5 within 3.3s	162.8Tom Patton	2:02.938Gregory Eaton · fastest of 17 · top 5 within 0.8s	2:03.900James Jost · fastest of 16 · top 5 within 2.1s	153.9James Jost	+11.425squal +12.756s	110.2%qual 111.6%	1:49.111Robert Iversen · fastest of 14 · top 5 within 0.8s	1:50.258Greg Gyann · fastest of 13 · top 5 within 0.4s	149.4Robert Iversen	-2.217squal -1.071s	98.0%qual 99.0%
34 rule changes (GT2: 21, AS: 4, P2: 9)10 weight · 8 cars added · 8 engine · 2 induction · 2 suspension & brakes · 1 tyres & wheels · 1 wording · 2 othershowhide 2019-10-01 AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other 2019-10-01 P2 Update Engine Table Line E notes #27414engine 2019-08-31 P2 Update P2 Engine Table spec lines to reflect 3/1/2019 #27254engine 2019-08-01 AS Request Ride Height Clarification #26598suspension & brakes 2019-07-01 GT2 TA2 Weight Clarification #27077weight 2019-07-01 P2 E&O Transmissions #27006tyres & wheels 2019-06-01 P2 Request to restrict all cars #26246weight 2019-05-31 AS Request to Revert to 2017 Weights #25885weight 2019-05-31 GT2 Request to classify Toyota Supra with 3SGTE engine #25185cars added 2019-05-31 GT2 Request to Classify Acura NSX from T1 to GT2? #26121cars added 2019-05-31 GT2 Request for TA2 BOP in GT2 #26509weight 2019-05-01 GT2 Request for e36/e46 bmw 4500 cc v8 at 2950lbs in GT2/ST #26106engine 2019-05-01 GT2 Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine 2019-05-01 GT2 Request to Classify Ligier JS2 R #26535cars added 2019-04-01 GT2 Request Ford Perfomance 5.2L crate engine FPR clarification #26159engine 2019-04-01 GT2 Request Ride Height Clarification #26600suspension & brakes 2019-03-01 GT2 Request Porsche Cayman year classification #26241other 2019-03-01 GT2 GT2/ST Porsche Cayman engine #26250engine 2019-03-01 P2 Change Engine Table Lines B.1 & B.5 #25777engine 2019-03-01 P2 Change Line A.1 restrictor size #26429induction 2019-02-01 AS SMG Mustang eligibility in American sedan #26224cars added 2019-01-01 GT2 ST/GT2 BMW Flossman Kit Clarification #22138wording 2019-01-01 GT2 Request Clarification/Revision of Appendix L (2013 TA2 Rules) #25110weight 2019-01-01 GT2 Request to classify BMW E82 (1 series) into GT2 #25539cars added 2019-01-01 GT2 2010 Cayman Street Tuner Into an STO Car,Addendum #25545weight 2019-01-01 GT2 Request - Classify Ford Performance 5.2l #25716cars added 2019-01-01 GT2 Add missing displacement, minimum weight. Remove #25765weight 2019-01-01 GT2 Request for Ford FP 350s Weight Reduction #25806weight 2019-01-01 GT2 Request to Classify EcoBoost Mustang #25842cars added 2019-01-01 GT2 Request to Remove Mazda RX 7 Body Work Penalty #26024weight 2019-01-01 GT2 GTX Homologation table update #26034cars added 2019-01-01 P2 Request to Allow 1345cc Hayabusa Engines for Spec Line P2 Cars #25595engine 2019-01-01 P2 Change CN inlet restrictor implementation date #25816induction 2019-01-01 P2 Clarify Honda K20A-FD2 parts requirement #25950weight
	Sonoma Raceway Runoffs 20182018-10-10	1:37.203Andrew Aquilante · fastest of 22 · top 5 within 2.1s	1:38.524R Spencer Trenery · fastest of 19 · top 5 within 1.3s	133.8Michael McAleenan	1:47.782Andrew McDermid · fastest of 12 · top 5 within 1.9s	1:50.345John Heinricy · fastest of 10 · top 5 within 2.3s	105.0Kevin Fandozzi	+11.821squal +10.579s	112.0%qual 110.9%	1:28.784Tim Day Jr · fastest of 17 · top 5 within 5.0s	1:32.071Chuck Bona · fastest of 18 · top 5 within 0.9s	144.4Tim Day Jr	-6.453squal -8.419s	93.5%qual 91.3%
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25	1:39.919Andrew Aquilante · fastest of 36 · top 5 within 2.9s	1:40.976Andrew Aquilante · fastest of 35 · top 5 within 2.6s		1:45.220James Jost · fastest of 29 · top 5 within 6.7s	1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s		+10.531squal +5.301s	110.4%qual 105.3%	1:31.826Jeff Shafer · fastest of 26 · top 5 within 4.9s	1:32.481Jeff Shafer · fastest of 24 · top 5 within 3.8s		-8.495squal -8.093s	91.6%qual 91.9%
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19	1:25.405Andrew Aquilante · fastest of 21 · top 5 within 2.8s	1:26.847Andrew Aquilante · fastest of 19 · top 5 within 1.5s		1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s	1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s		+6.577squal +5.246s	107.6%qual 106.1%	1:20.188Jeff Shafer · fastest of 18 · top 5 within 4.0s	1:20.904Jeff Shafer · fastest of 16 · top 5 within 2.2s		-5.943squal -5.217s	93.2%qual 93.9%
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21	1:53.652Jordan Bupp · fastest of 27 · top 5 within 1.2s	1:53.543Jordan Bupp · fastest of 22 · top 5 within 1.7s		2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s	2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s		+9.379squal +8.094s	108.3%qual 107.1%	1:51.825Chris Farrell · fastest of 17 · top 5 within 3.6s	1:52.355Jeff Shafer · fastest of 17 · top 5 within 2.8s		-1.188squal -1.827s	99.0%qual 98.4%

By track

Track	Events	Typical % of GT2	Best	Latest
Road America	4	100.0%	100.0%Runoffs 2020	100.0%Runoffs 2026
Virginia International Raceway	3	100.0%	100.0%Runoffs 2019	100.0%Runoffs 2023
Indianapolis Motor Speedway	2	100.0%	100.0%Runoffs 2017	100.0%Runoffs 2021
Daytona International Speedway	1	100.0%	100.0%Runoffs 2015	100.0%Runoffs 2015
Mid-Ohio Sports Car Course	1	100.0%	100.0%Runoffs 2016	100.0%Runoffs 2016
Sonoma Raceway	1	100.0%	100.0%Runoffs 2018	100.0%Runoffs 2018

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 GT2'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.