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FX vs AS vs FV pace at every track

Lap times across years say as much about the weather as the class. % of FX is each class's best lap as a share of FX'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+vsFV×FX×GT1+GT2+GTX+HP+P+P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+Show 51 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: FX 100.0% of FX Jacob Loomis, Road America Runoffs 2020 race · AS 96.8% of FX Gregory Eaton, Virginia International Raceway Runoffs 2022 race · FV 107.3% of FX Andrew Whitston, Virginia International Raceway Runoffs 2022 race

1:402:002:202:4010 rule changes between Runoffs 2018 and Runoffs 201910 ▾28 rule changes between Runoffs 2019 and Runoffs 202028 ▾19 rule changes between Runoffs 2020 and Runoffs 202119 ▾22 rule changes between Runoffs 2021 and Runoffs 202222 ▾7 rule changes between Runoffs 2022 and Runoffs 20237 ▾17 rule changes between Runoffs 2023 and Runoffs 202417 ▾12 rule changes between Runoffs 2024 and Runoffs 202512 ▾14 rule changes between Runoffs 2025 and Runoffs 202614 ▾FX race best at Runoffs 2020: 2:17.553 (Jacob Loomis)FX race best at Runoffs 2021: 1:38.833 (Vaughn Glace)FX race best at Runoffs 2022: 2:08.711 (Dimitrios Tsesmetzis)FX qualifying best at Runoffs 2020: 2:16.968 (Jacob Loomis)FX qualifying best at Runoffs 2021: 1:38.596 (Vaughn Glace)FX qualifying best at Runoffs 2022: 1:51.480 (Trevor A Russell)AS race best at Runoffs 2015: 2:02.922 (Andy McDermid)AS race best at Runoffs 2016: 1:33.424 (Edward Hosni)AS race best at Runoffs 2017: 1:51.507 (Bryan Long)AS race best at Runoffs 2018: 1:50.345 (John Heinricy)AS race best at Runoffs 2019: 2:03.900 (James Jost)AS race best at Runoffs 2020: 2:27.668 (Gregory Eaton)AS race best at Runoffs 2021: 1:50.606 (Gregory Eaton)AS race best at Runoffs 2022: 2:04.578 (Gregory Eaton)AS race best at Runoffs 2023: 2:04.120 (Gregory Eaton)AS race best at Runoffs 2024: 2:26.429 (Gregory Eaton)AS race best at Runoffs 2025: 2:29.232 (Gregory Eaton)AS race best at Runoffs 2026: 2:28.471 (Andrew McDermid)AS qualifying best at Runoffs 2015: 2:01.746 (Tom Sloe)AS qualifying best at Runoffs 2016: 1:30.651 (Tom Sloe)AS qualifying best at Runoffs 2017: 1:45.220 (James Jost)AS qualifying best at Runoffs 2018: 1:47.782 (Andrew McDermid)AS qualifying best at Runoffs 2019: 2:02.938 (Gregory Eaton)AS qualifying best at Runoffs 2020: 2:27.045 (Gregory Eaton)AS qualifying best at Runoffs 2021: 1:50.427 (Drew Cattell)AS qualifying best at Runoffs 2022: 2:02.162 (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 2:03.082 (Daniel Richardson)AS qualifying best at Runoffs 2024: 2:26.578 (Gregory Eaton)AS qualifying best at Runoffs 2025: 2:26.792 (Andrew McDermid)AS qualifying best at Runoffs 2026: 2:26.911 (Andrew McDermid)FV race best at Runoffs 2015: 2:21.142 (Andrew Whitston)FV race best at Runoffs 2016: 1:38.066 (Flinn Lazier)FV race best at Runoffs 2017: 1:55.923 (Michael Varacins)FV race best at Runoffs 2018: 1:53.639 (Alex Scaler)FV race best at Runoffs 2019: 2:18.289 (Zachary Whitston)FV race best at Runoffs 2020: 2:45.816 (Alex Scaler)FV race best at Runoffs 2021: 1:57.234 (Alex Scaler)FV race best at Runoffs 2022: 2:18.093 (Andrew Whitston)FV race best at Runoffs 2023: 2:16.611 (Andrew Abbott)FV race best at Runoffs 2024: 2:44.834 (Andrew Abbott)FV race best at Runoffs 2025: 2:46.736 (Zachary Whitston)FV race best at Runoffs 2026: 2:45.272 (Brian Farnham)FV qualifying best at Runoffs 2015: 2:21.167 (Roger Siebenaler)FV qualifying best at Runoffs 2016: 1:37.942 (Alex Scaler)FV qualifying best at Runoffs 2017: 1:55.759 (Michael Varacins)FV qualifying best at Runoffs 2018: 1:52.637 (Skip Streets)FV qualifying best at Runoffs 2019: 2:15.712 (Andrew Whitston)FV qualifying best at Runoffs 2020: 2:43.994 (Hunter Phelps-Barron)FV qualifying best at Runoffs 2021: 1:57.479 (Andrew Whitston)FV qualifying best at Runoffs 2022: 2:15.116 (Brian Farnham)FV qualifying best at Runoffs 2023: 2:15.639 (Andrew Whitston)FV qualifying best at Runoffs 2024: 2:42.643 (Andrew Whitston)FV qualifying best at Runoffs 2025: 2:44.101 (Andrew Abbott)FV qualifying best at Runoffs 2026: 2:46.536 (Zachary Whitston)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
FXASFVsolid race · dashed qualifying · slower is lower
100%105%110%115%120%10 rule changes between Runoffs 2018 and Runoffs 201910 ▾28 rule changes between Runoffs 2019 and Runoffs 202028 ▾19 rule changes between Runoffs 2020 and Runoffs 202119 ▾22 rule changes between Runoffs 2021 and Runoffs 202222 ▾7 rule changes between Runoffs 2022 and Runoffs 20237 ▾17 rule changes between Runoffs 2023 and Runoffs 202417 ▾12 rule changes between Runoffs 2024 and Runoffs 202512 ▾14 rule changes between Runoffs 2025 and Runoffs 202614 ▾FX race best at Runoffs 2020: 100.0% of FX's (Jacob Loomis)FX race best at Runoffs 2021: 100.0% of FX's (Vaughn Glace)FX race best at Runoffs 2022: 100.0% of FX's (Dimitrios Tsesmetzis)FX qualifying best at Runoffs 2020: 100.0% of FX's (Jacob Loomis)FX qualifying best at Runoffs 2021: 100.0% of FX's (Vaughn Glace)FX qualifying best at Runoffs 2022: 100.0% of FX's (Trevor A Russell)AS race best at Runoffs 2020: 107.4% of FX's (Gregory Eaton)AS race best at Runoffs 2021: 111.9% of FX's (Gregory Eaton)Off the chart: AS race best at Runoffs 2022: 96.8% of FX's (Gregory Eaton)AS qualifying best at Runoffs 2020: 107.4% of FX's (Gregory Eaton)AS qualifying best at Runoffs 2021: 112.0% of FX's (Drew Cattell)AS qualifying best at Runoffs 2022: 109.6% of FX's (Kurt Rezzetano)FV race best at Runoffs 2020: 120.5% of FX's (Alex Scaler)FV race best at Runoffs 2021: 118.6% of FX's (Alex Scaler)FV race best at Runoffs 2022: 107.3% of FX's (Andrew Whitston)FV qualifying best at Runoffs 2020: 119.7% of FX's (Hunter Phelps-Barron)FV qualifying best at Runoffs 2021: 119.2% of FX's (Andrew Whitston)FV qualifying best at Runoffs 2022: 121.2% of FX's (Brian Farnham)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
FXASFVsolid race · dashed qualifying · each class's best lap as a share of FX's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventFXASFV
Qual best Race best Trap Qual best Race best Trap vs FX % of FX Qual best Race best Trap vs FX % of FX 
Road America Runoffs 20262026-09-282:26.911Andrew 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%)2:46.536Zachary Whitston · fastest of 37 · top 5 within 1.7s+2.435s (+1.48%)2:45.272Brian Farnham · fastest of 34 · top 5 within 1.3s-1.464s (-0.88%)117.4Rick Shields+0.2 mph (+0.1%)
14 rule changes (FX: 1, AS: 13)5 weight · 4 engine · 2 tyres & wheels · 1 induction · 1 removed · 1 othershowhide
  • AS 2016+ Camaro Spec Line Full Prep #39646tyres & wheels
  • AS Consideration of Pirelli P Zero Trofeo Track for AS Competition #40495tyres & wheels
  • AS Change in 9.1.6.D.4.d.5 in Suspension Mounting Points #40094other
  • AS Re-Add 4.6L 4v 96-04 Mustang Cobra #40239weight
  • AS Errors and Omissions #40532weight
  • FX Update sealed engine teardown section #40622engine
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • AS 1994 Mustang Spec Line Request #39104engine
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
Road America Runoffs 20252025-09-292:26.792Andrew 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%)2:44.101Andrew Abbott · fastest of 34 · top 5 within 1.3s+1.458s (+0.90%)2:46.736Zachary Whitston · fastest of 29 · top 5 within 0.6s+1.902s (+1.15%)117.2Zachary Whitston+0.7 mph (+0.6%)
12 rule changes (FX: 1, AS: 11)5 engine · 4 weight · 2 induction · 1 othershowhide
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • AS Errors and Omissions #38234engine
  • AS Errors and Omission #38055induction
  • AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO #38197engine
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • AS Race memo #37902engine
  • AS Increase Coyote Engine Restrictor to 80mm #36177induction
  • AS Performance Pack for 2015+ Mustang #36867weight
  • AS Gear Ratios #37131engine
  • AS ECU specs for LS engine #37208engine
  • FX Request to Change to Weight for Ligier JS F422 #37124weight -15 lbs
Road America Runoffs 20242024-10-012:26.578Gregory 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%)2:42.643Andrew Whitston · fastest of 27 · top 5 within 2.3s-1.351s (-0.82%)2:44.834Andrew Abbott · fastest of 27 · top 5 within 0.9s-0.982s (-0.59%)116.5Brian Farnham-0.7 mph (-0.6%)
17 rule changes (FX: 4, AS: 11, FV: 2)6 cars added · 3 tyres & wheels · 1 engine · 1 suspension & brakes · 1 weight · 5 othershowhide
  • FV Disc Brakes #36822suspension & brakes
  • AS Mustang transmission ratios #36662engine
  • FX Adjust minimum weights to align with pro F4 rules #36221weight -15 lbs
  • AS Request for Classification of 2018-2023 mustang In #35764cars added
  • AS 6th gen Camaro limited prep #35733cars added
  • AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK #35825cars added
  • AS Full Prep Head #35891other
  • AS Restricted Prep Aftermarket Parts Request #35682other
  • AS Allowance of 11 #35824tyres & wheels
  • FX Add Classification for 2nd Gen Ligier JS F422 #35844other
  • AS Request to Classify 1970-1981 Camaro and Firebird in AS #33659cars added
  • AS Fuel Cell 12 #34194other
  • AS Please Classify the 6th Gen Into AS. #35448cars added
  • AS spec lines #35713cars added
  • FX Clarify Formula 4 Rules in FX #35700tyres & wheels
  • FV FV Wheel Bearing Clarification #35150tyres & wheels
  • FX FM Rules Update #34841other
Virginia International Raceway Runoffs 20232023-09-232:03.082Daniel 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%)2:15.639Andrew Whitston · fastest of 27 · top 5 within 1.4s+0.523s (+0.39%)2:16.611Andrew Abbott · fastest of 23 · top 5 within 1.6s-1.482s (-1.07%)115.6Brian Farnham-0.2 mph (-0.2%)
7 rule changes (FX: 3, AS: 4)2 engine · 2 weight · 1 suspension & brakes · 1 tyres & wheels · 1 othershowhide
  • AS Crate Motor Part Numbers #32944engine
  • AS Request wheel size change #33007tyres & wheels
  • AS Alternative Upper Front Control Arms for Dodge Challenger #33352engine
  • AS Front Brake Caliper Adapters for Dodge Challenger #33353suspension & brakes
  • FX USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC #34329weight
  • FX E&O - Remove references to FB and FM in GCR section 1.4.2.D #33725other
  • FX Reclassify 2010-2017 Formula Renault 2.0 as a spec line car in FA #33395weight
Virginia International Raceway Runoffs 20222022-09-241:51.480Trevor A Russell · fastest of 5 · top 5 within 9.7s2:08.711Dimitrios Tsesmetzis · fastest of 4 · top 4 within 6.8s137.2Trevor A Russell2:02.162Kurt 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%)-4.133squal +10.682s96.8%qual 109.6%2:15.116Brian Farnham · fastest of 29 · top 5 within 1.1s-0.596s (-0.44%)2:18.093Andrew Whitston · fastest of 28 · top 5 within 1.2s-0.196s (-0.14%)115.8Jonathan Weisheit+1.1 mph (+0.9%)+9.382squal +23.636s107.3%qual 121.2%
22 rule changes (FX: 9, AS: 9, FV: 4)8 weight · 4 tyres & wheels · 3 engine · 1 induction · 1 suspension & brakes · 2 wording · 3 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • FX Pro Formula F2000/USF2000 Transmission E&O #32823weight
  • FX Formula Mazda Minimum Weight #33010weight
  • FX Formula Mazda Spec Line E&O Corrections #33011engine
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • FX Formula Renault 2.0 (10-17) Intake Restrictor #32745induction
  • FX Allow Performance Electronics PE3-8400 for USF2000 MZR #32767engine
  • FV Connecting Rod Update Request for 9.1.1.C Formula Vee (FV) 5.C.6 #32160weight
  • FV E&O clarification of connecting rod center-to-center length #32183weight
  • FX FM Rule Set Clarification #31881tyres & wheels
  • FX E&O F4 Tires #31940tyres & wheels
  • FX E&O USF2000 Tube Frame #31951tyres & wheels
  • FX URGENT - FX- Formula Renault Tire #32058tyres & wheels
  • AS Proposed Revisions to SCCA GCR 2021 Appendix M, Part 3 #30295other
  • AS specification line consolidation and correction #31846wording
  • AS correction of SMG specification line #31847suspension & brakes
  • AS Alternate cylinder heads for full prep engine builds - Evaluation #31851engine
  • FV Update direct replacement connecting rod information #31843weight
  • FV Formula V Connecting Rod Replacement #31448weight
  • AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other
  • AS Request Pontiac GTO tire size change #30881weight
Indianapolis Motor Speedway Runoffs 20212021-09-251:38.596Vaughn Glace · fastest of 15 · top 5 within 4.1s1:38.833Vaughn Glace · fastest of 15 · top 5 within 4.3s138.6Vaughn Glace1:50.427Drew 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+11.773squal +11.831s111.9%qual 112.0%1:57.479Andrew Whitston · fastest of 48 · top 5 within 0.8s+1.720s (+1.49%)1:57.234Alex Scaler · fastest of 47 · top 5 within 1.0s+1.311s (+1.13%)124.0Mark Edwards+18.401squal +18.883s118.6%qual 119.2%
19 rule changes (FX: 5, AS: 14)6 weight · 5 cars added · 3 engine · 2 tyres & wheels · 1 induction · 2 wordingshowhide
  • FX Rules Adjustment #30950tyres & wheels
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • AS Request to consolidate SN95 Mustang '94-'04 Mustang spec lines #30428cars added
  • AS American Sedan Transmission Rule Change Request #30595weight
  • AS Correction to specifications inadvertently deleted #30691wording
  • AS weight adjustments #30700weight +50 lbs
  • FX FX/FRP Tire Rule #30723tyres & wheels
  • FX Classify the 2000-2009 Formula Renault 2.0 / Fran-Am 2000 #30460cars added
  • AS AS Mustang LP 4.6 3V Classification Transmission Request #29886weight
  • AS Request CF driveshaft on CTS-V for durability improvement #30117engine
  • AS Adjustment to model years of 5th generation RP Camaro #30348engine
  • AS Request for 2015 -2017 Ford Mustang Spec Line #29514cars added
  • AS Request Trunk lid / Rear Hatch clarification #29591wording
  • AS Common Weight for CTS-V Tire #29759weight
  • AS Correction to specifications inadvertently deleted #30041cars added
  • FX Request for Car Classification to Compete in Formula X #29933cars added
  • AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine
  • AS Rule simplification spec line communization #29824weight
  • FX Update specifications for FormulaSPEED cars #29674induction
Road America Runoffs 20202020-10-022:16.968Jacob Loomis · fastest of 12 · top 5 within 2.7s2:17.553Jacob Loomis · fastest of 11 · top 5 within 3.5s139.3Brad Drew2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton+10.115squal +10.077s107.4%qual 107.4%2:43.994Hunter Phelps-Barron · fastest of 28 · top 5 within 0.6s2:45.816Alex Scaler · fastest of 24 · top 5 within 1.5s117.1Hunter Phelps-Barron+28.263squal +27.026s120.5%qual 119.7%
28 rule changes (FX: 6, AS: 16, FV: 6)9 tyres & wheels · 5 cars added · 3 engine · 3 induction · 2 suspension & brakes · 2 weight · 1 aero · 3 othershowhide
  • FX Follow up to to Letter#28991 Request for FX classification #29281cars added
  • AS Dodge Challenger AS Spec Line Clarification #28698induction
  • AS Dodge Challenger AS Spec Line Clarification #2 #28699aero
  • AS Support for R-Type Specification Tires #27450tyres & wheels
  • AS Spec Tire Request #27519tyres & wheels
  • AS Restrictor Plate Change for RP 2011+ Mustang with Coyote Engine #27675induction
  • AS 2005-2009 Restricted Prep 4.6 3V #27908engine
  • AS Request for 2005-2009 Restricted Prep 4.6 3V Parts #27909engine
  • AS Request for Full Preparation Classification for 2010-2014 Camaro #28030other
  • AS Cylinder Heads #28696engine
  • AS Request for Max Rotor Diameter Change #28748suspension & brakes
  • AS Request increase rotor diameter #28797other
  • FV Support for Recommended Item - 4 bolt wheels in FV #29084tyres & wheels
  • FV Support for 4-bolt pattern wheels #28955 #29118tyres & wheels
  • FX Request to be added to FX group #28991other
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • FX Request to classify FSV in FX #28057cars added
  • FX Classify FormulaSPEED in FX #28715cars added
  • FV Update rain tire designation #28444tyres & wheels
  • FX Request to remove tire marking language from FM #28415tyres & wheels
  • AS Rear Trailing Arms #28007suspension & brakes
  • AS Weight reduction for cars running iron heads #28010weight
  • AS 05-10 Mustang with HR cam classification #28226cars added
  • AS 10-15 Camaro Full Prep classification #28227cars added
  • FX Change to FX Table 1 #28322induction
  • FV FV Allow non-spec tire in Regional competition #26284tyres & wheels
  • FV Request to Allow Rear Tires on the Front of Formula Vee #26537tyres & wheels
  • FV Clarification on Wheel Bolt Pattern #27603tyres & wheels
Virginia International Raceway Runoffs 20192019-10-052:02.938Gregory Eaton · fastest of 17 · top 5 within 0.8s2:03.900James Jost · fastest of 16 · top 5 within 2.1s153.9James Jost2:15.712Andrew Whitston · fastest of 26 · top 5 within 1.5s2:18.289Zachary Whitston · fastest of 19 · top 5 within 0.4s114.8Roger Siebenaler
10 rule changes (AS: 4, FV: 6)2 suspension & brakes · 1 cars added · 1 induction · 1 tyres & wheels · 1 weight · 4 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • FV Allowed Modifications E&O #27398other
  • FV E&O Wheels #27230tyres & wheels
  • AS Request Ride Height Clarification #26598suspension & brakes
  • AS Request to Revert to 2017 Weights #25885weight
  • FV Exhaust termination rule E&O #26702other
  • FV E&O Dimensions #26674other
  • FV Request to clarify Disc Brake rules bearing retainer & weights #26262suspension & brakes
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • FV FV Intake Manifold Clarification #26008induction
Sonoma Raceway Runoffs 20182018-10-101:47.782Andrew McDermid · fastest of 12 · top 5 within 1.9s1:50.345John Heinricy · fastest of 10 · top 5 within 2.3s105.0Kevin Fandozzi1:52.637Skip Streets · fastest of 29 · top 5 within 1.6s1:53.639Alex Scaler · fastest of 28 · top 5 within 0.4s106.3Skip Streets
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s1:55.759Michael Varacins · fastest of 39 · top 5 within 1.0s1:55.923Michael Varacins · fastest of 32 · top 5 within 1.3s
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s1:37.942Alex Scaler · fastest of 41 · top 5 within 0.3s1:38.066Flinn Lazier · fastest of 38 · top 5 within 0.7s
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s2:21.167Roger Siebenaler · fastest of 31 · top 5 within 0.8s2:21.142Andrew Whitston · fastest of 30 · top 5 within 1.1s

By track

TrackEvents Typical % of FX Best Latest 
Road America4100.0%1 of 4 with FX100.0%Runoffs 2020100.0%Runoffs 2020
Virginia International Raceway3100.0%1 of 3 with FX100.0%Runoffs 2022100.0%Runoffs 2022
Indianapolis Motor Speedway2100.0%1 of 2 with FX100.0%Runoffs 2021100.0%Runoffs 2021
Daytona International Speedway10 of 1 with FX
Mid-Ohio Sports Car Course10 of 1 with FX
Sonoma Raceway10 of 1 with FX
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 FX'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.