BoP Lab / Classes / FA

FA vs FE2 vs AS pace at every track

Lap times across years say as much about the weather as the class. % of FA is each class's best lap as a share of FA'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 +vsFE2 ×FF +FP +FV +FX +GT1 +GT2 +GTX +HP +P +P2 +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 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: FA 100.0% of FA Tyler Hunter, Daytona International Speedway Runoffs 2015 race · FE2 105.9% of FA Charles Russell Turner, Virginia International Raceway Runoffs 2022 qualifying · AS 113.0% of FA Tom Sloe, Daytona International Speedway Runoffs 2015 qualifying

% of FALap times

FAFE2ASsolid race · dashed qualifying · slower is lower

FAFE2ASsolid race · dashed qualifying · each class's best lap as a share of FA's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	FA			FE2					AS
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs FA	% of FA	Qual best	Race best	Trap	vs FA	% of FA
	Road America Runoffs 20262026-09-28	2:02.513Dudley Fleck · fastest of 9 · top 5 within 6.9s+1.590s (+1.31%)	2:03.334James French · fastest of 10 · top 5 within 1.4s+0.680s (+0.55%)	158.6John McAleer+1.5 mph (+1.0%)	2:12.326Franklin Futrelle · fastest of 8 · top 5 within 1.9s-0.149s (-0.11%)	2:11.881Franklin Futrelle · fastest of 8 · top 5 within 1.6s-1.458s (-1.09%)	143.5Steve Whitston-5.5 mph (-3.7%)	+8.547squal +9.813s	106.9%qual 108.0%	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%)	+25.137squal +24.398s	120.4%qual 119.9%
21 rule changes (FA: 7, FE2: 1, AS: 13)6 weight · 5 engine · 4 induction · 2 tyres & wheels · 1 removed · 3 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 2026-08-01 FA Update sealed engine teardown section #40621engine 2026-06-01 AS Clarification for LM7 Holley Carburetor #40167engine 2026-06-01 FA Motor Classification #40175weight 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 2026-02-01 AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight 2026-02-01 FA Pro Mazda Classification and Performance Enhancement Proposal #39411induction 2026-01-01 AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction 2026-01-01 FA Alternate Intake Manifold for MZR #38223induction 2026-01-01 FA Engine Compression Rule Change Request #39302engine 2026-01-01 FA Change Formula 1000 allowances #39608induction 2025-12-01 AS 1994 Mustang Spec Line Request #39104engine 2025-11-01 AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs 2025-11-01 FA Re-Consider USF Pro 2000 Car for Formula Atlantic Class #38783other 2025-10-01 FE2 FE & FE2 Bubble Tail #38978other
	Road America Runoffs 20252025-09-29	2:00.923Hans Peter · fastest of 12 · top 5 within 2.4s-0.637s (-0.52%)	2:02.654Hans Peter · fastest of 11 · top 5 within 3.1s+0.864s (+0.71%)	157.0Shane Kennett-3.0 mph (-1.9%)	2:12.475Franklin Futrelle · fastest of 11 · top 5 within 1.4s+0.969s (+0.74%)	2:13.339Franklin Futrelle · fastest of 10 · top 5 within 0.6s+0.591s (+0.45%)	149.0Steve Whitston+3.7 mph (+2.6%)	+10.685squal +11.552s	108.7%qual 109.6%	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%)	+26.578squal +25.869s	121.7%qual 121.4%
15 rule changes (FA: 3, FE2: 1, AS: 11)5 engine · 3 weight · 2 induction · 2 tyres & wheels · 1 cars added · 2 othershowhide 2025-07-01 AS RE: Previous Letter 37695 Update #38245weight -75 lbs 2025-07-01 FA Ligier JS F3 Tire Choice #38434tyres & wheels 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 2025-04-01 FE2 Driver Safety & Comfort #37965other 2025-03-01 AS Race memo #37902engine 2025-03-01 FA Update Formula Renault 2.0 spec line notes #37853tyres & wheels 2025-02-01 FA Classify FR European Championship car as spec line car in Table 2 #37658cars added 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
	Road America Runoffs 20242024-10-01	2:01.560Hans Peter · fastest of 13 · top 5 within 2.0s-2.714s (-2.18%)	2:01.790Dudley Fleck · fastest of 12 · top 5 within 3.3s-2.956s (-2.37%)	160.0Brandon Schwarz+9.4 mph (+6.3%)	2:11.506Porter Aiken · fastest of 18 · top 5 within 0.5s-1.300s (-0.98%)	2:12.748Porter Aiken · fastest of 17 · top 5 within 2.0s-0.523s (-0.39%)	145.3Porter Aiken+1.9 mph (+1.3%)	+10.958squal +9.946s	109.0%qual 108.2%	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%)	+24.639squal +25.018s	120.2%qual 120.6%
11 rule changes (AS: 11)6 cars added · 1 engine · 1 tyres & wheels · 3 othershowhide 2024-09-01 AS Mustang transmission ratios #36662engine 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 2024-04-01 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
	Virginia International Raceway Runoffs 20232023-09-23				1:50.665Charles Russell Turner · fastest of 26 · top 5 within 2.3s-0.188s (-0.17%)	1:51.098Franklin Futrelle · fastest of 19 · top 5 within 1.4s-20.947s (-15.86%)	141.3Franklin Futrelle-0.6 mph (-0.4%)			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%)
11 rule changes (FA: 7, AS: 4)3 engine · 3 tyres & wheels · 2 induction · 1 suspension & brakes · 1 weight · 1 othershowhide 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 2023-06-01 FA Simplify Pro Formula Mazda wheel allowance #34190tyres & wheels 2023-05-01 FA E&O - Correct Pro Formula Mazda spec line dimensional equivalent #34085tyres & wheels 2023-05-01 FA Add new spec line for MSR Formula Mazda FMzR to Table 2 #34139other 2023-01-01 FA BDA Displacement #33431engine 2022-12-01 FA Reclassify 2010-2017 Formula Renault 2.0 as a spec line car in FA #33395weight 2022-12-01 FA Change Swift 016 2.3L restrictor size and minimum weight #33472induction -30 lbs 2022-10-01 FA Pro Formula Mazda Dimension E&O #33160induction
	Virginia International Raceway Runoffs 20222022-09-24	1:44.703Chip Romer · fastest of 7 · top 5 within 4.0s+3.158s (+3.11%)	1:48.507Alex Mayer · fastest of 4 · top 4 within 4.2s+5.400s (+5.24%)	154.6Austin Hill-1.4 mph (-0.9%)	1:50.853Charles Russell Turner · fastest of 25 · top 5 within 1.1s-0.209s (-0.19%)	2:12.045Jason Conzo · fastest of 22 · top 5 within 1.8s+19.891s (+17.74%)	141.9Eric Cruz-0.6 mph (-0.5%)	+23.538squal +6.150s	121.7%qual 105.9%	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%)	+16.071squal +17.459s	114.8%qual 116.7%
16 rule changes (FA: 7, AS: 9)4 engine · 3 weight · 1 aero · 1 suspension & brakes · 1 tyres & wheels · 2 wording · 4 othershowhide 2022-09-01 AS Request to add Hoosier W2 #33031other 2022-09-01 AS correction of Dodge Challenger specification line #33151wording 2022-07-01 AS Request CTS-V Spec Line Error Correction #30242weight 2022-05-01 FA Update FR Americas rulebook requirement #32491engine 2022-05-01 FA Clarify verification of sealed engine compliance #32522engine 2022-05-01 FA Clarify Formula Lites and FR Americas sealed engine requirement #32523engine 2022-04-01 FA E&O FA Transmission section #32251tyres & wheels 2022-04-01 FA E&O Swift 016 2.5 liter Aero column #32363aero 2022-03-01 FA Closing the Gap #31934other 2022-02-01 FA Reorganize Tables 1 and 2 #31985weight 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 2021-10-01 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
	Indianapolis Motor Speedway Runoffs 20212021-09-25	1:29.701James French · fastest of 18 · top 5 within 2.7s-0.256s (-0.28%)	1:30.650James French · fastest of 17 · top 5 within 6.1s-0.715s (-0.78%)	155.5James French	1:36.395Max Grau · fastest of 28 · top 5 within 0.7s	1:36.655Max Grau · fastest of 28 · top 5 within 0.7s	146.2Gray Fowler	+6.005squal +6.694s	106.6%qual 107.5%	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	+19.956squal +20.726s	122.0%qual 123.1%
36 rule changes (FA: 22, AS: 14)12 weight · 9 engine · 4 cars added · 2 induction · 2 removed · 1 tyres & wheels · 3 wording · 3 othershowhide 2021-09-01 FA E&O Table 2 engine names #31085engine 2021-08-01 FA Move Toyota 1800 to Table 2 #30822removed 2021-08-01 FA E&O Swift 016 wheel width reference #30939tyres & wheels 2021-07-01 FA Update FA rules package #30717engine 2021-07-01 FA Move Mazda MZR/Ford Duratec 2296cc and 2500cc to Table 2 #30718removed 2021-07-01 FA Clean up Table 2 Mazda MZR 2.0L and Honda Civic K20Z3 spec lines #30719other 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 2021-06-01 FA E&O Mazda MZR 2.0 and Honda Civic K20Z3 chassis eligibility #30632other 2021-05-01 FA Correct engine name in Swift 016 2.3 liter spec line #30447engine 2021-05-01 FA Correct engine name in Swift 016 2.5 liter spec line #30448engine 2021-05-01 FA Revise Table 1 Spec Lines and clarify application of Engine Notes #30456engine 2021-04-01 FA Update Table 1 Weights for Spec Lines C, I, and K #30355weight -25 lbs 2021-04-01 FA Remove redundant reference in Table 2 spec line #30366weight 2021-04-01 FA Correct the name of the FR Americas car #30369wording 2021-04-01 FA Clean up Spec Line D in Table 1 #30372weight 2021-04-01 FA Table 2 Honda K20Z3 request #30386induction 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 FA E&O FA Intake Restrictors #30273induction 2021-03-01 FA Clean up Spec Lines A and B in Table 1 #30274weight 2021-03-01 FA Clean up Spec Line C in Table 1 #30275weight 2021-03-01 FA Clean up Spec Lines J and L in Table 1 #30276weight 2021-03-01 FA Move engine specifications to Pro Formula Mazda spec line notes #30278engine 2021-03-01 FA Update F3 Americas spec line #30280other 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 FA Request to classify Formula Lites Crawford FL15 #29702cars 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
	Road America Runoffs 20202020-10-02	2:04.274Spencer Brockman · fastest of 11 · top 5 within 2.7s	2:04.746Spencer Brockman · fastest of 10 · top 5 within 2.4s	150.6Hans Peter	2:12.806Scott Rettich · fastest of 25 · top 5 within 0.6s	2:13.271Owen McAllister · fastest of 23 · top 5 within 0.7s	143.4Owen McAllister	+8.525squal +8.532s	106.8%qual 106.9%	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	+22.922squal +22.771s	118.4%qual 118.3%
33 rule changes (FA: 15, FE2: 2, AS: 16)7 engine · 5 weight · 4 induction · 4 tyres & wheels · 2 aero · 2 cars added · 2 suspension & brakes · 1 removed · 1 wording · 5 othershowhide 2020-09-01 FE2 FE/FE2 Oil Cooler #29293wording 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 FA Request to Adjust FB Weight for Stock Engines #29005weight 2020-06-01 FA E&O permitted engine modifications #28831engine 2020-06-01 FA E&O Transmissions #28832other 2020-06-01 FA Swift 016 Gurney flap wicker clarification #28884aero 2020-05-01 AS weight adjustments for 2020 season #28785weight -50 lbs 2020-05-01 FA Remove redundant spec line in Table 1 #28720removed 2020-05-01 FA E&O general engine rules #28772engine 2020-04-01 FA Request higher compression ratio and prior weights for F1000 cars #28162engine 2020-04-01 FA Remove redundant wheel dimension provisions #28554tyres & wheels 2020-04-01 FA E&O Formula 3 spec line #28596induction 2020-03-01 FA FA weight correction/clarification #28430engine 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 2020-01-01 FA Request to merge FB into FA #25611weight 2020-01-01 FA Suggestions for FB/F1000 into FA #27319other 2020-01-01 FA Change Swift 016 - 2.3 liter Mazda Duratec restrictor size #27880induction 2019-12-01 FA Move wheel dimensions from Bodywork subsection to #27493tyres & wheels 2019-12-01 FA Table 2 Mazda MZR 2.0 E&O #27640other 2019-12-01 FE2 FE / FE2 Update Rules #27624weight
	Virginia International Raceway Runoffs 20192019-10-05	1:41.545Dario Cangialosi · fastest of 8 · top 5 within 2.8s	1:43.107Dario Cangialosi · fastest of 8 · top 5 within 1.8s	155.9Kent Vaccaro	1:51.062Liam Snyder · fastest of 20 · top 5 within 1.3s	1:52.154Liam Snyder · fastest of 19 · top 5 within 0.7s	142.6Robert Vanman	+9.047squal +9.517s	108.8%qual 109.4%	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	+20.793squal +21.393s	120.2%qual 121.1%
11 rule changes (FA: 7, AS: 4)4 weight · 2 engine · 1 cars added · 1 removed · 1 suspension & brakes · 2 othershowhide 2019-10-01 AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other 2019-10-01 FA Follow up to Letter #27344 on Honda Powered FA Rules #27363removed 2019-08-31 FA Swift 014 Mazda MZR 2.0 E&O #27305weight 2019-08-01 AS Request Ride Height Clarification #26598suspension & brakes 2019-05-31 AS Request to Revert to 2017 Weights #25885weight 2019-05-31 FA Adjust Line N restrictor size and minimum weight #26691weight +30 lbs 2019-05-01 FA Add data plate requirement #26707other 2019-03-01 FA Request to add FA engine spec lines #26183engine 2019-02-01 AS SMG Mustang eligibility in American sedan #26224cars added 2019-02-01 FA FA MZR 2.0 Engine Specification #25814engine 2019-02-01 FA FA 016 weight increase #26063weight
	Sonoma Raceway Runoffs 20182018-10-10	1:28.176Mirl Swan · fastest of 7 · top 5 within 4.0s	1:29.924Mirl Swan · fastest of 7 · top 5 within 2.6s	144.8Antony Opheim	1:35.040Flinn Lazier · fastest of 9 · top 5 within 1.5s	1:35.563Flinn Lazier · fastest of 9 · top 5 within 1.7s	126.8Scott Rettich	+5.639squal +6.864s	106.3%qual 107.8%	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	+20.421squal +19.606s	122.7%qual 122.2%
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25	1:29.957Sedat Yelkin · fastest of 12 · top 5 within 2.3s	1:31.365Keith Grant · fastest of 12 · top 5 within 1.0s							1:45.220James Jost · fastest of 29 · top 5 within 6.7s	1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s		+20.142squal +15.263s	122.0%qual 117.0%
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19	1:14.920Ryan Norman · fastest of 5 · top 5 within 7.0s	1:19.009Ryan Norman · fastest of 5 · top 5 within 4.7s							1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s	1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s		+14.415squal +15.731s	118.2%qual 121.0%
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21	1:47.758Tyler Hunter · fastest of 10 · top 5 within 3.7s	1:48.162Tyler Hunter · fastest of 8 · top 5 within 5.3s							2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s	2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s		+14.760squal +13.988s	113.6%qual 113.0%

By track

Track	Events	Typical % of FA	Best	Latest
Road America	4	100.0%	100.0%Runoffs 2020	100.0%Runoffs 2026
Virginia International Raceway	3	100.0%2 of 3 with FA	100.0%Runoffs 2019	100.0%Runoffs 2022
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 FA'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.