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FX vs AS vs SM vs SMX 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: remove one to add another)
vsAS×B-SpecEPFAFCFE2FFFPFVFX×GT1GT2GTXHPPP2vsSM×vsSMX×SRF3STLSTUT1T2T3T4Show 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 · SM 108.1% of FX Travis Wiley, Virginia International Raceway Runoffs 2022 race

1:402:002:202:408 rule changes between Runoffs 2018 and Runoffs 20198 ▾24 rule changes between Runoffs 2019 and Runoffs 202024 ▾20 rule changes between Runoffs 2020 and Runoffs 202120 ▾19 rule changes between Runoffs 2021 and Runoffs 202219 ▾8 rule changes between Runoffs 2022 and Runoffs 20238 ▾23 rule changes between Runoffs 2023 and Runoffs 202423 ▾21 rule changes between Runoffs 2024 and Runoffs 202521 ▾18 rule changes between Runoffs 2025 and Runoffs 202618 ▾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)Off the chart: 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)SM race best at Runoffs 2015: 2:24.067 (Todd Lamb)SM race best at Runoffs 2016: 1:40.764 (Michael Carter)SM race best at Runoffs 2017: 1:59.100 (Michael Gagliardo)SM race best at Runoffs 2018: 1:55.278 (Michael Carter)SM race best at Runoffs 2019: 2:16.459 (Elivan Goulart)SM race best at Runoffs 2020: 2:43.748 (Preston Pardus)SM race best at Runoffs 2021: 1:58.837 (Brian Henderson)SM race best at Runoffs 2022: 2:19.107 (Travis Wiley)SM race best at Runoffs 2023: 2:16.229 (Julian DaCosta)SM race best at Runoffs 2024: 2:41.486 (Brett Kowalski)SM race best at Runoffs 2025: 2:44.430 (Kyle Greenhill)SM race best at Runoffs 2026: 2:42.725 (Francisco Barroso)SM qualifying best at Runoffs 2015: 2:18.661 (Andrew Carbonell)SM qualifying best at Runoffs 2016: 1:40.514 (Justin Hille)SM qualifying best at Runoffs 2017: 1:58.306 (Chris Haldeman)SM qualifying best at Runoffs 2018: 1:54.355 (Ken Sutherland)SM qualifying best at Runoffs 2019: 2:14.552 (Todd Buras)SM qualifying best at Runoffs 2020: 2:42.209 (Kyle Greenhill)SM qualifying best at Runoffs 2021: 1:57.695 (Brian Henderson)SM qualifying best at Runoffs 2022: 2:14.664 (Danny Steyn)SM qualifying best at Runoffs 2023: 2:14.986 (Danny Steyn)SM qualifying best at Runoffs 2024: 2:41.106 (Ethan Goulart)SM qualifying best at Runoffs 2025: 2:43.111 (Bobby Gossett)SM qualifying best at Runoffs 2026: 2:42.173 (Brett Kowalski)SMX race best at Runoffs 2023: 2:12.616 (Noah Harmon)SMX race best at Runoffs 2024: 2:36.278 (Ethan Jacobs)SMX race best at Runoffs 2025: 2:37.091 (Michael Tinis)SMX race best at Runoffs 2026: 2:36.414 (Cam Ebben)SMX qualifying best at Runoffs 2023: 2:11.435 (Nathan Nicholson)SMX qualifying best at Runoffs 2024: 2:35.651 (Ethan Lampe)SMX qualifying best at Runoffs 2025: 2:36.232 (Cam Ebben)SMX qualifying best at Runoffs 2026: 2:36.472 (Skyler Cottrell)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
FXASSMSMXsolid race · dashed qualifying · slower is lower
100%105%110%115%120%8 rule changes between Runoffs 2018 and Runoffs 20198 ▾24 rule changes between Runoffs 2019 and Runoffs 202024 ▾20 rule changes between Runoffs 2020 and Runoffs 202120 ▾19 rule changes between Runoffs 2021 and Runoffs 202219 ▾8 rule changes between Runoffs 2022 and Runoffs 20238 ▾23 rule changes between Runoffs 2023 and Runoffs 202423 ▾21 rule changes between Runoffs 2024 and Runoffs 202521 ▾18 rule changes between Runoffs 2025 and Runoffs 202618 ▾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)SM race best at Runoffs 2020: 119.0% of FX's (Preston Pardus)SM race best at Runoffs 2021: 120.2% of FX's (Brian Henderson)SM race best at Runoffs 2022: 108.1% of FX's (Travis Wiley)SM qualifying best at Runoffs 2020: 118.4% of FX's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 119.4% of FX's (Brian Henderson)SM qualifying best at Runoffs 2022: 120.8% of FX's (Danny Steyn)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
FXASSMSMXsolid 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
EventFXASSMSMX
Qual best Race best Trap Qual best Race best Trap vs FX % of FX 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%)2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%)2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%)119.6Wyatt Couch+0.3 mph (+0.3%)2:36.472Skyler Cottrell · fastest of 21 · top 5 within 0.4s+0.240s (+0.15%)2:36.414Cam Ebben · fastest of 21 · top 5 within 1.1s-0.677s (-0.43%)128.4Christian Hoagland-0.6 mph (-0.5%)
18 rule changes (FX: 1, AS: 13, SM: 2, SMX: 2)5 weight · 4 engine · 2 tyres & wheels · 1 induction · 1 removed · 2 wording · 3 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
  • SM Rear Toe Link #40271other
  • SMX Rear Toe Link #40271other
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • SM Part Number Change Request #39914wording
  • SMX Part Number Change Request #39914wording
  • 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%)2:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%)2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%)119.3Francisco Barroso-0.6 mph (-0.5%)2:36.232Cam Ebben · fastest of 20 · top 5 within 0.2s+0.581s (+0.37%)2:37.091Michael Tinis · fastest of 19 · top 5 within 0.3s+0.813s (+0.52%)129.1Camden Gruber-0.4 mph (-0.3%)
21 rule changes (FX: 1, AS: 11, SM: 4, SMX: 5)5 engine · 4 weight · 2 induction · 2 tyres & wheels · 2 wording · 6 othershowhide
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • AS Errors and Omissions #38234engine
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • SMX SMX Data Submission - Penalties #38248other
  • SMX SMX Penaly Clarification updated language #38337wording
  • AS Errors and Omission #38055induction
  • AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO #38197engine
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • SMX Clarify Tire Marking Regs #38004tyres & wheels
  • SMX SMX Data Submission Timeframe #38039other
  • 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
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
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%)2:41.106Ethan Goulart · fastest of 49 · top 5 within 0.5s-1.103s (-0.68%)2:41.486Brett Kowalski · fastest of 43 · top 5 within 0.3s-2.262s (-1.38%)119.9Alex Bertagnoli-1.4 mph (-1.2%)2:35.651Ethan Lampe · fastest of 23 · top 5 within 0.7s2:36.278Ethan Jacobs · fastest of 22 · top 5 within 0.7s129.5Michael Borden
23 rule changes (FX: 4, AS: 11, SM: 4, SMX: 4)6 cars added · 3 engine · 2 suspension & brakes · 2 tyres & wheels · 1 weight · 2 wording · 7 othershowhide
  • AS Mustang transmission ratios #36662engine
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • SMX SMX Camera Rule Correction #36496wording
  • SMX AIM ECU Protocol #36556engine
  • SMX OE versus OEM Definitons #36608other
  • SMX Shifter Bushing #36611suspension & brakes
  • 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
  • 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%)2:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%)2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%)120.3Jim Drago+1.1 mph (+0.9%)2:11.435Nathan Nicholson · fastest of 18 · top 5 within 0.6s2:12.616Noah Harmon · fastest of 16 · top 5 within 0.1s127.8Noah Harmon
8 rule changes (FX: 3, AS: 4, SM: 1)3 weight · 2 engine · 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
  • SM BOP for NB1 and NB2 #32309weight
  • 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%2:14.664Danny Steyn · fastest of 60 · top 5 within 0.2s+0.112s (+0.08%)2:19.107Travis Wiley · fastest of 58 · top 5 within 0.9s+2.648s (+1.94%)119.2Jonathan Neudorf-0.6 mph (-0.5%)+10.396squal +23.184s108.1%qual 120.8%
19 rule changes (FX: 9, AS: 9, SM: 1)4 tyres & wheels · 4 weight · 3 engine · 2 suspension & brakes · 1 induction · 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
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • 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
  • 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%1:57.695Brian Henderson · fastest of 90 · top 5 within 0.5s-0.611s (-0.52%)1:58.837Brian Henderson · fastest of 88 · top 5 within 0.3s-0.263s (-0.22%)119.8Kyle Greenhill+20.004squal +19.099s120.2%qual 119.4%
20 rule changes (FX: 5, AS: 14, SM: 1)6 weight · 5 cars added · 3 engine · 2 tyres & wheels · 1 induction · 2 wording · 1 othershowhide
  • 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
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • 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%2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill+26.195squal +25.241s119.0%qual 118.4%
24 rule changes (FX: 6, AS: 16, SM: 2)5 cars added · 4 engine · 3 induction · 3 suspension & brakes · 3 tyres & wheels · 2 weight · 1 aero · 3 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • 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
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • 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
  • 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
  • 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
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 Jost2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago
8 rule changes (AS: 4, SM: 4)2 weight · 1 cars added · 1 engine · 1 suspension & brakes · 1 tyres & wheels · 1 wording · 1 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • AS Request Ride Height Clarification #26598suspension & brakes
  • AS Request to Revert to 2017 Weights #25885weight
  • SM Request to allow aftermarket fuel filters. #26370wording
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • SM Request 99-00 replacement Wire harnesses #25602engine
  • SM Organize and Clarify 9.1.7.C.1.o. #25913weight
  • SM Strike Tire Tread Language #26123tyres & wheels
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 Fandozzi1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn
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 0.9s1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s
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 1.0s1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s
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 2.2s2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s

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.