BoP Lab / Classes / GT3

GT3 vs AS vs FB pace at every track

Lap times across years say as much about the weather as the class. % of GT3 is each class's best lap as a share of GT3'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 +vsFB ×FC +FE2 +FF +FP +FV +FX +GT1 +GT2 +GT3×GTX +HP +P +P2 +SM +SMX +SRF3 +STL +STU +T1 +T2 +T3 +T4 +Show 49 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: GT3 100.0% of GT3 Joe Kristensen, Daytona International Speedway Runoffs 2015 race · AS 86.3% of GT3 Gregory Eaton, Virginia International Raceway Runoffs 2022 race · FB 87.8% of GT3 J R Osborne, Sonoma Raceway Runoffs 2018 qualifying

% of GT3Lap times

GT3ASFBsolid race · dashed qualifying · slower is lower

GT3ASFBsolid race · dashed qualifying · each class's best lap as a share of GT3's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	GT3			AS					FB
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs GT3	% of GT3	Qual best	Race best	Trap	vs GT3	% of GT3
	Road America Runoffs 20262026-09-28				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%)
15 rule changes (GT3: 2, AS: 13)5 weight · 3 engine · 2 removed · 2 tyres & wheels · 1 induction · 1 suspension & brakes · 1 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 2026-04-01 AS Header Information Update for EFI Engine Build Sheets #39886engine 2026-04-01 AS Errors and Omissions #39933weight 2026-03-01 AS Re-Organization of AS Spec lines for 2026 #39887removed 2026-03-01 GT3 Remove GT3U from GCR as it is now in STU #39862removed 2026-02-01 AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight 2026-01-01 AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction 2026-01-01 GT3 GT3U Ride Height #39637suspension & brakes 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				2:26.792Andrew 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%)
20 rule changes (GT3: 9, AS: 11)9 weight · 6 engine · 2 induction · 1 aero · 1 removed · 1 othershowhide 2025-08-01 GT3 Declassify TCR Cars from GT3/GT3U #38569removed 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 2025-05-01 GT3 Clarification of GT3U #38266weight 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 2025-01-01 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 GT3 Correct language regarding OEM Areo Devices #37137aero 2025-01-01 GT3 VW Funcap weight #37217weight 2024-12-01 GT3 Pontiac Weight and Chassis Adjustment Request #36938weight -150 lbs 2024-11-01 GT3 GCR GT3 Disfranchised GT2 #36291weight -75 lbs 2024-11-01 GT3 Nissan MR20DE Engine Classification Request for GT3 #36791engine 2024-11-01 GT3 GT3 Mazda 13B PP correction #37057weight -175 lbs 2024-11-01 GT3 GT3 Mazda12A PP Correction #37058weight -200 lbs
	Road America Runoffs 20242024-10-01	2:22.108Tony Ave · fastest of 13 · top 5 within 3.7s+0.226s (+0.16%)	2:22.863Tony Ave · fastest of 13 · top 5 within 3.3s-1.368s (-0.95%)	151.2Jeff Dernehl+1.8 mph (+1.2%)	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%)	+3.566squal +4.470s	102.5%qual 103.1%
41 rule changes (GT3: 30, AS: 11)10 cars added · 10 engine · 9 weight · 3 induction · 2 tyres & wheels · 1 aero · 1 removed · 2 wording · 3 othershowhide 2024-09-01 AS Mustang transmission ratios #36662engine 2024-09-01 GT3 2024 Mazda 3 TC request for GT3 #36517cars added 2024-08-01 GT3 Adding Datsun B110 to List of Approved Cars #36198cars added 2024-08-01 GT3 Honda Civic Type R TCR Weight Reduction Request #36550weight 2024-07-01 GT3 Correct missed Disenfranchised weight reduction #36237weight 2024-07-01 GT3 errors & omissions on GT3 Mazda MZR spec lines #36241removed 2024-06-01 AS Request for Classification of 2018-2023 mustang In #35764cars added 2024-06-01 GT3 GT3 +1mm SIR add 175lbs. In #36098induction 2024-06-01 GT3 Revised GT3 Built Turbocharged chart #36100induction 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 GT3 Request for Spec Line 1010 Reconsideration #35009weight +300 lbs 2024-05-01 GT3 Mazda MZR Engines #35753engine 2024-05-01 GT3 Disenfranchised GT2 Acura RSX to Run GT3 #35773weight 2024-05-01 GT3 Toyota 4Y Engine Request #35885engine 2024-05-01 GT3 GT3 spec lines clean-up #36008wording 2024-05-01 GT3 GT3 Honda spec line clean-up x 2 #36009engine 2024-05-01 GT3 GT3 Mazda spec line clean-up x2 #36010wording 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 GT3 Miata Turbo Clarification #35386induction +100 lbs 2024-02-01 GT3 Rear Blade Spoiler Clarification #35261aero 2024-02-01 GT3 GT Direct Injection allowance and rules #35437engine 2024-02-01 GT3 Request to Include Toyota FA24D Engine for use in GT3 #35199engine 2024-02-01 GT3 GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine 2024-02-01 GT3 Edit GT3 Nissan QR25DE/DD spec line #35442engine 2024-01-01 GT3 Disenfranchised GT2 RX7. #35028weight 2024-01-01 GT3 Turbo Help #35042weight -100 lbs 2024-01-01 GT3 Competition Adjustment Request for 13B Peripheral Port #35100weight -100 lbs 2024-01-01 GT3 Request to Include Toyota GR 86 in GT3 #35197cars added 2024-01-01 GT3 Fastrack Toyota 3S Correction #35258engine 2023-12-01 GT3 Toyota Engine Classification Request #35019engine 2023-12-01 GT3 GT3 2.0L SIR & weight #35171weight 2023-12-01 GT3 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight 2023-11-01 GT3 GT3 TCR 200 TW tires #34993tyres & wheels 2023-10-01 GT3 Classify Honda B20 engine in GT3 CRX #34781cars added
	Virginia International Raceway Runoffs 20232023-09-23	1:58.065Tony Ave · fastest of 9 · top 5 within 3.8s+0.930s (+0.79%)	1:59.872Tony Ave · fastest of 8 · top 5 within 3.9s-24.475s (-16.96%)	145.8Jeff Dernehl-3.6 mph (-2.4%)	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%)	+4.248squal +5.017s	103.5%qual 104.2%
14 rule changes (GT3: 10, AS: 4)5 engine · 3 induction · 3 tyres & wheels · 1 cars added · 1 suspension & brakes · 1 weightshowhide 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 2023-08-01 GT3 Addendum to letter 33913, GT3 DOT tires. #34627tyres & wheels 2023-05-01 GT3 Please classify Fields Cardinal V8 #33784cars added 2023-01-01 GT3 Remove Nissan VG30 engine from GT3 #33609engine 2023-01-01 GT3 GT3 Choke option effective 1-01-2023 #33669induction 2023-01-01 GT3 GT3 2.0L choke/weight option #33670weight 2022-12-01 GT3 Turbocharged Engine Rules #33145induction 2022-12-01 GT3 GT2 (TA2)/GTA Part Number Update #33315induction 2022-12-01 GT3 GT3 Nissian SR20VET unrestricted ECU change #33432engine 2022-11-01 GT3 Add 84-87 Civic #33091tyres & wheels 2022-10-01 GT3 GT3 Turbo Displacement Clarification #32952engine
	Virginia International Raceway Runoffs 20222022-09-24	1:57.135Jeff Dernehl · fastest of 13 · top 5 within 3.2s-1.059s (-0.90%)	2:24.347Tony Ave · fastest of 12 · top 5 within 8.2s+25.302s (+21.25%)	149.5Jeff Dernehl-0.2 mph (-0.1%)	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%)	-19.769squal +5.027s	86.3%qual 104.3%
26 rule changes (GT3: 17, AS: 9)9 cars added · 4 weight · 3 engine · 2 suspension & brakes · 1 aero · 1 tyres & wheels · 3 wording · 3 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 GT3 Tail lights on all GT category race cars. #32799suspension & brakes 2022-08-01 GT3 SR20VET Engine Option Request #32648engine 2022-07-01 AS Request CTS-V Spec Line Error Correction #30242weight 2022-07-01 GT3 Correct Model GT3 - Fiat #32776wording 2022-06-01 GT3 Correct Fiat Spider Years #32149cars added 2022-05-01 GT3 wheel size addition #32247tyres & wheels 2022-04-01 GT3 GT3 TCR Car Feedback #31677weight +2 lbs 2022-03-01 GT3 Request to Classify Ginetta G40 in GT3 #31598cars added 2022-03-01 GT3 Normally Aspirated 2.0L DOHC MZR Motor #31733cars added 2022-03-01 GT3 Volvo S60 in GT3 #31970cars added 2022-03-01 GT3 GT3 2.0L 4V engines now unrestricted. #32190engine 2022-03-01 GT3 TB correction to wing wording #32191aero 2022-02-01 GT3 Request to add Fiat to GT3 CARS #31803cars added 2022-02-01 GT3 Request to add Fiat to GT3 CARS #31804cars added 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 2021-12-01 GT3 31032 correction to weight #31525weight -210 lbs 2021-12-01 GT3 Add TCR cars to GT3 #31540cars added 2021-11-01 GT3 Please approve 1964-1968 Ford Cortina GT for competition in GT# #30941cars added 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 GT3 Request car classification #31032cars added
	Indianapolis Motor Speedway Runoffs 20212021-09-25	1:44.758Troy Ermish · fastest of 14 · top 5 within 4.6s+0.179s (+0.17%)	1:46.694Troy Ermish · fastest of 13 · top 5 within 4.1s+0.364s (+0.34%)	145.8Stacy Wilson	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	+3.912squal +5.669s	103.7%qual 105.4%
20 rule changes (GT3: 6, AS: 14)6 weight · 4 cars added · 3 engine · 3 induction · 3 wording · 1 othershowhide 2021-08-01 GT3 Request to Update GTA Obsolete Part Numbers #30615wording 2021-07-01 GT3 Request to Permit FP cars in GT3 #30611other 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 GT3 Mazda MZR 2.0L Engine #30455induction 2021-05-01 GT3 Disfranchised GT3 Mazda, correct choke size #30570induction 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 2021-01-01 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 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 GT3 Mazda MZR SIR Sizing #29555induction 2020-12-01 GT3 Request to Classify 1992-1997 Honda Prelude #29687cars added
	Road America Runoffs 20202020-10-02	2:21.882Michael Lewis · fastest of 12 · top 5 within 3.0s	2:24.231Tony Ave · fastest of 12 · top 5 within 3.0s	149.5Jeff Dernehl	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	+3.437squal +5.163s	102.4%qual 103.6%
33 rule changes (GT3: 17, AS: 16)8 induction · 6 cars added · 5 aero · 4 engine · 3 weight · 2 suspension & brakes · 2 tyres & wheels · 3 othershowhide 2020-09-01 GT3 GT Category Wording #29193induction 2020-08-01 AS Dodge Challenger AS Spec Line Clarification #28698induction 2020-08-01 AS Dodge Challenger AS Spec Line Clarification #2 #28699aero 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 GT3 Request to add Mazda 12A Peripheral Port to GT3 rule set #28842cars added 2020-07-01 GT3 TA2 Gurney flap wicker clarification #28874aero 2020-07-01 GT3 STO Gurney flap wicker clarification #28883aero 2020-07-01 GT3 GT Gurney flap wicker clarification #28909aero 2020-07-01 GT3 GT3 4v SIR size increase. #28931induction 2020-07-01 GT3 Request for Addition to GT3 Approved Turbo List #27576induction 2020-06-01 GT3 Request Nissan KA24E specifications #28808weight 2020-05-01 AS weight adjustments for 2020 season #28785weight -50 lbs 2020-03-01 GT3 Error Regarding Mazda Engine Listing #28119engine +245 lbs 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 GT3 Windshield Clips #27323other 2020-01-01 GT3 Request Factory Five Daytona coupe classification #26308cars added 2020-01-01 GT3 Request restrictor size change request #26958induction 2020-01-01 GT3 Request to Classify Alfa Romeo 4C #27322cars added 2020-01-01 GT3 Request for Mazda 2.5l MZR/L5-VE #27570induction -245 lbs 2020-01-01 GT3 GT3 turbo engines add Honda #28033induction 2020-01-01 GT3 GT3 wing end plate #28035aero 2019-12-01 GT3 Request to Add SR16VE to GT-3 Spec Lines #27357cars added
	Virginia International Raceway Runoffs 20192019-10-05	1:58.194Michael Lewis · fastest of 17 · top 5 within 2.2s	1:59.045Tony Ave · fastest of 16 · top 5 within 1.7s	149.6Jeff Dernehl	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	+4.855squal +4.744s	104.1%qual 104.0%	1:54.469Pete Frost · only car	1:57.688Pete Frost · only car	145.9Pete Frost	-1.357squal -3.725s	98.9%qual 96.8%
12 rule changes (GT3: 8, AS: 4)4 cars added · 3 weight · 2 suspension & brakes · 1 engine · 1 induction · 1 othershowhide 2019-10-01 AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other 2019-08-31 GT3 Requesting Increase in Choke Diameter for Mazda 12A Bridgeport #27043induction 2019-08-01 AS Request Ride Height Clarification #26598suspension & brakes 2019-05-31 AS Request to Revert to 2017 Weights #25885weight 2019-05-01 GT3 Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine 2019-05-01 GT3 Request to Classify Ligier JS2 R #26535cars added 2019-04-01 GT3 26076 revised Spec line chart #26528weight 2019-04-01 GT3 Request Ride Height Clarification #26600suspension & brakes 2019-03-01 GT3 Request clarification on bridge porting for rotary #26076weight 2019-03-01 GT3 Request to add 4G69 Mitsubishi #26154cars added 2019-02-01 AS SMG Mustang eligibility in American sedan #26224cars added 2019-01-01 GT3 GTX Homologation table update #26034cars added
	Sonoma Raceway Runoffs 20182018-10-10	1:40.947Michael Lewis · fastest of 10 · top 5 within 3.8s	1:42.634Michael Lewis · fastest of 8 · top 5 within 4.4s	115.7Collin Jackson	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	+7.711squal +6.835s	107.5%qual 106.8%	1:28.612J R Osborne · fastest of 7 · top 5 within 3.3s	1:31.189J R Osborne · fastest of 7 · top 5 within 3.7s	140.5J R Osborne	-11.445squal -12.335s	88.8%qual 87.8%
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25	1:44.579Collin Jackson · fastest of 17 · top 5 within 5.0s	1:46.330Collin Jackson · fastest of 15 · top 5 within 3.1s		1:45.220James Jost · fastest of 29 · top 5 within 6.7s	1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s		+5.177squal +0.641s	104.9%qual 100.6%	1:33.746Gary Hickman · fastest of 18 · top 5 within 3.3s	1:33.702Alex Mayer · fastest of 17 · top 5 within 3.0s		-12.628squal -10.833s	88.1%qual 89.6%
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19	1:30.797Gary Bockman · fastest of 15 · top 5 within 2.0s	1:31.107Joe Kristensen · fastest of 14 · top 5 within 2.5s		1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s	1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s		+2.317squal -0.146s	102.5%qual 99.8%	1:19.886Alex Mayer · fastest of 10 · top 5 within 1.5s	1:21.015Jeremy Hill · fastest of 10 · top 5 within 1.2s		-10.092squal -10.911s	88.9%qual 88.0%
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21	2:01.736Joe Kristensen · fastest of 11 · top 5 within 3.0s	2:03.617Joe Kristensen · fastest of 10 · top 5 within 1.8s		2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s	2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s		-0.695squal +0.010s	99.4%qual 100.0%	1:50.711J R Osborne · fastest of 20 · top 5 within 1.1s	1:51.616J R Osborne · fastest of 19 · top 5 within 2.1s		-12.001squal -11.025s	90.3%qual 90.9%

By track

Track	Events	Typical % of GT3	Best	Latest
Road America	4	100.0%2 of 4 with GT3	100.0%Runoffs 2020	100.0%Runoffs 2024
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 GT3'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.