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GT2 vs SM vs SRF3 vs F5 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: remove one to add another)
ASB-SpecEPvsF5×FAFCFE2FFFPFVFXGT1GT2×GTXHPPP2vsSM×SMXvsSRF3×STLSTUT1T2T3T4Show 50 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: GT2 100.0% of GT2 Jordan Bupp, Daytona International Speedway Runoffs 2015 race · SM 96.2% of GT2 Brian Henderson, Indianapolis Motor Speedway Runoffs 2021 race · SRF3 89.1% of GT2 John Black, Indianapolis Motor Speedway Runoffs 2021 race · F5 83.5% of GT2 Sven de Vries, Indianapolis Motor Speedway Runoffs 2021 race

1:402:002:202:4029 rule changes between Runoffs 2018 and Runoffs 201929 ▾41 rule changes between Runoffs 2019 and Runoffs 202041 ▾26 rule changes between Runoffs 2020 and Runoffs 202126 ▾24 rule changes between Runoffs 2021 and Runoffs 202224 ▾24 rule changes between Runoffs 2022 and Runoffs 202324 ▾27 rule changes between Runoffs 2023 and Runoffs 202427 ▾14 rule changes between Runoffs 2024 and Runoffs 202514 ▾17 rule changes between Runoffs 2025 and Runoffs 202617 ▾GT2 race best at Runoffs 2015: 1:53.543 (Jordan Bupp)GT2 race best at Runoffs 2016: 1:26.847 (Andrew Aquilante)GT2 race best at Runoffs 2017: 1:40.976 (Andrew Aquilante)GT2 race best at Runoffs 2018: 1:38.524 (R Spencer Trenery)GT2 race best at Runoffs 2019: 1:52.475 (Andrew Aquilante)GT2 race best at Runoffs 2020: 2:14.279 (Andrew Aquilante)GT2 race best at Runoffs 2021: 2:03.513 (Tim Kezman)GT2 race best at Runoffs 2022: 1:53.048 (Daniel Bender)GT2 race best at Runoffs 2023: 1:52.865 (Jared Odrick)GT2 race best at Runoffs 2024: 2:13.311 (John Atwell)GT2 race best at Runoffs 2025: 2:13.447 (John Atwell)GT2 race best at Runoffs 2026: 2:10.650 (John Atwell)GT2 qualifying best at Runoffs 2015: 1:53.652 (Jordan Bupp)GT2 qualifying best at Runoffs 2016: 1:25.405 (Andrew Aquilante)GT2 qualifying best at Runoffs 2017: 1:39.919 (Andrew Aquilante)GT2 qualifying best at Runoffs 2018: 1:37.203 (Andrew Aquilante)GT2 qualifying best at Runoffs 2019: 1:50.182 (Andrew Aquilante)GT2 qualifying best at Runoffs 2020: 2:12.298 (Andrew Aquilante)GT2 qualifying best at Runoffs 2021: 1:39.665 (Andrew Aquilante)GT2 qualifying best at Runoffs 2022: 1:51.086 (Andrew Aquilante)GT2 qualifying best at Runoffs 2023: 1:52.004 (Barry Boes)GT2 qualifying best at Runoffs 2024: 2:11.860 (Charlie Peter)GT2 qualifying best at Runoffs 2025: 2:11.807 (Brad McAllister)GT2 qualifying best at Runoffs 2026: 2:09.634 (John Atwell)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)SRF3 race best at Runoffs 2015: 2:10.215 (Chad Galloway)SRF3 race best at Runoffs 2016: 1:34.947 (Cliff White)SRF3 race best at Runoffs 2017: 1:49.782 (Tray Ayres)SRF3 race best at Runoffs 2018: 1:47.053 (TJ Acker)SRF3 race best at Runoffs 2019: 2:04.755 (Bobby Sak)SRF3 race best at Runoffs 2020: 2:31.038 (Justin Hille)SRF3 race best at Runoffs 2021: 1:50.095 (John Black)SRF3 race best at Runoffs 2022: 2:22.066 (Franklin Futrelle)SRF3 race best at Runoffs 2023: 2:04.911 (David Ogburn)SRF3 race best at Runoffs 2024: 2:28.129 (S Sandy Satullo III)SRF3 race best at Runoffs 2025: 2:29.839 (Morgan Burkhard)SRF3 race best at Runoffs 2026: 2:29.257 (Peyton Long)SRF3 qualifying best at Runoffs 2015: 2:08.557 (Kerry Jacobsen)SRF3 qualifying best at Runoffs 2016: 1:34.363 (John Black)SRF3 qualifying best at Runoffs 2017: 1:49.824 (John Black)SRF3 qualifying best at Runoffs 2018: 1:46.117 (Robeson Clay Russell)SRF3 qualifying best at Runoffs 2019: 2:04.624 (Brian Schofield)SRF3 qualifying best at Runoffs 2020: 2:29.786 (TJ Acker)SRF3 qualifying best at Runoffs 2021: 1:49.520 (Franklin Futrelle)SRF3 qualifying best at Runoffs 2022: 2:03.716 (Franklin Futrelle)SRF3 qualifying best at Runoffs 2023: 2:03.842 (Morgan Burkhard)SRF3 qualifying best at Runoffs 2024: 2:27.773 (Denny Stripling)SRF3 qualifying best at Runoffs 2025: 2:28.226 (Bobby Sak)SRF3 qualifying best at Runoffs 2026: 2:27.443 (Tyler Stephens)F5 race best at Runoffs 2015: 2:03.298 (Matthew Strand)F5 race best at Runoffs 2016: 1:29.853 (Steven Thompson)F5 race best at Runoffs 2017: 1:42.860 (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 1:42.491 (David Lapham)F5 race best at Runoffs 2019: 1:57.572 (Wiley Mcmahan)F5 race best at Runoffs 2020: 2:21.391 (James Weida)F5 race best at Runoffs 2021: 1:43.140 (Sven de Vries)F5 race best at Runoffs 2022: 2:21.862 (Sven de Vries)F5 qualifying best at Runoffs 2015: 2:01.824 (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 1:28.528 (Calvin Stewart)F5 qualifying best at Runoffs 2017: 1:43.136 (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 1:41.807 (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 1:57.361 (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 2:20.954 (Calvin Stewart)F5 qualifying best at Runoffs 2021: 1:42.619 (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 1:57.689 (James Weida)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
GT2SMSRF3F5solid race · dashed qualifying · slower is lower
100%110%120%29 rule changes between Runoffs 2018 and Runoffs 201929 ▾41 rule changes between Runoffs 2019 and Runoffs 202041 ▾26 rule changes between Runoffs 2020 and Runoffs 202126 ▾24 rule changes between Runoffs 2021 and Runoffs 202224 ▾24 rule changes between Runoffs 2022 and Runoffs 202324 ▾27 rule changes between Runoffs 2023 and Runoffs 202427 ▾14 rule changes between Runoffs 2024 and Runoffs 202514 ▾17 rule changes between Runoffs 2025 and Runoffs 202617 ▾GT2 race best at Runoffs 2015: 100.0% of GT2's (Jordan Bupp)GT2 race best at Runoffs 2016: 100.0% of GT2's (Andrew Aquilante)GT2 race best at Runoffs 2017: 100.0% of GT2's (Andrew Aquilante)GT2 race best at Runoffs 2018: 100.0% of GT2's (R Spencer Trenery)GT2 race best at Runoffs 2019: 100.0% of GT2's (Andrew Aquilante)GT2 race best at Runoffs 2020: 100.0% of GT2's (Andrew Aquilante)GT2 race best at Runoffs 2021: 100.0% of GT2's (Tim Kezman)GT2 race best at Runoffs 2022: 100.0% of GT2's (Daniel Bender)GT2 race best at Runoffs 2023: 100.0% of GT2's (Jared Odrick)GT2 race best at Runoffs 2024: 100.0% of GT2's (John Atwell)GT2 race best at Runoffs 2025: 100.0% of GT2's (John Atwell)GT2 race best at Runoffs 2026: 100.0% of GT2's (John Atwell)GT2 qualifying best at Runoffs 2015: 100.0% of GT2's (Jordan Bupp)GT2 qualifying best at Runoffs 2016: 100.0% of GT2's (Andrew Aquilante)GT2 qualifying best at Runoffs 2017: 100.0% of GT2's (Andrew Aquilante)GT2 qualifying best at Runoffs 2018: 100.0% of GT2's (Andrew Aquilante)GT2 qualifying best at Runoffs 2019: 100.0% of GT2's (Andrew Aquilante)GT2 qualifying best at Runoffs 2020: 100.0% of GT2's (Andrew Aquilante)GT2 qualifying best at Runoffs 2021: 100.0% of GT2's (Andrew Aquilante)GT2 qualifying best at Runoffs 2022: 100.0% of GT2's (Andrew Aquilante)GT2 qualifying best at Runoffs 2023: 100.0% of GT2's (Barry Boes)GT2 qualifying best at Runoffs 2024: 100.0% of GT2's (Charlie Peter)GT2 qualifying best at Runoffs 2025: 100.0% of GT2's (Brad McAllister)GT2 qualifying best at Runoffs 2026: 100.0% of GT2's (John Atwell)SM race best at Runoffs 2015: 126.9% of GT2's (Todd Lamb)SM race best at Runoffs 2016: 116.0% of GT2's (Michael Carter)SM race best at Runoffs 2017: 117.9% of GT2's (Michael Gagliardo)SM race best at Runoffs 2018: 117.0% of GT2's (Michael Carter)SM race best at Runoffs 2019: 121.3% of GT2's (Elivan Goulart)SM race best at Runoffs 2020: 121.9% of GT2's (Preston Pardus)Off the chart: SM race best at Runoffs 2021: 96.2% of GT2's (Brian Henderson)SM race best at Runoffs 2022: 123.1% of GT2's (Travis Wiley)SM race best at Runoffs 2023: 120.7% of GT2's (Julian DaCosta)SM race best at Runoffs 2024: 121.1% of GT2's (Brett Kowalski)SM race best at Runoffs 2025: 123.2% of GT2's (Kyle Greenhill)SM race best at Runoffs 2026: 124.6% of GT2's (Francisco Barroso)SM qualifying best at Runoffs 2015: 122.0% of GT2's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 117.7% of GT2's (Justin Hille)SM qualifying best at Runoffs 2017: 118.4% of GT2's (Chris Haldeman)SM qualifying best at Runoffs 2018: 117.6% of GT2's (Ken Sutherland)SM qualifying best at Runoffs 2019: 122.1% of GT2's (Todd Buras)SM qualifying best at Runoffs 2020: 122.6% of GT2's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 118.1% of GT2's (Brian Henderson)SM qualifying best at Runoffs 2022: 121.2% of GT2's (Danny Steyn)SM qualifying best at Runoffs 2023: 120.5% of GT2's (Danny Steyn)SM qualifying best at Runoffs 2024: 122.2% of GT2's (Ethan Goulart)SM qualifying best at Runoffs 2025: 123.7% of GT2's (Bobby Gossett)SM qualifying best at Runoffs 2026: 125.1% of GT2's (Brett Kowalski)SRF3 race best at Runoffs 2015: 114.7% of GT2's (Chad Galloway)SRF3 race best at Runoffs 2016: 109.3% of GT2's (Cliff White)SRF3 race best at Runoffs 2017: 108.7% of GT2's (Tray Ayres)SRF3 race best at Runoffs 2018: 108.7% of GT2's (TJ Acker)SRF3 race best at Runoffs 2019: 110.9% of GT2's (Bobby Sak)SRF3 race best at Runoffs 2020: 112.5% of GT2's (Justin Hille)Off the chart: SRF3 race best at Runoffs 2021: 89.1% of GT2's (John Black)SRF3 race best at Runoffs 2022: 125.7% of GT2's (Franklin Futrelle)SRF3 race best at Runoffs 2023: 110.7% of GT2's (David Ogburn)SRF3 race best at Runoffs 2024: 111.1% of GT2's (S Sandy Satullo III)SRF3 race best at Runoffs 2025: 112.3% of GT2's (Morgan Burkhard)SRF3 race best at Runoffs 2026: 114.2% of GT2's (Peyton Long)SRF3 qualifying best at Runoffs 2015: 113.1% of GT2's (Kerry Jacobsen)SRF3 qualifying best at Runoffs 2016: 110.5% of GT2's (John Black)SRF3 qualifying best at Runoffs 2017: 109.9% of GT2's (John Black)SRF3 qualifying best at Runoffs 2018: 109.2% of GT2's (Robeson Clay Russell)SRF3 qualifying best at Runoffs 2019: 113.1% of GT2's (Brian Schofield)SRF3 qualifying best at Runoffs 2020: 113.2% of GT2's (TJ Acker)SRF3 qualifying best at Runoffs 2021: 109.9% of GT2's (Franklin Futrelle)SRF3 qualifying best at Runoffs 2022: 111.4% of GT2's (Franklin Futrelle)SRF3 qualifying best at Runoffs 2023: 110.6% of GT2's (Morgan Burkhard)SRF3 qualifying best at Runoffs 2024: 112.1% of GT2's (Denny Stripling)SRF3 qualifying best at Runoffs 2025: 112.5% of GT2's (Bobby Sak)SRF3 qualifying best at Runoffs 2026: 113.7% of GT2's (Tyler Stephens)F5 race best at Runoffs 2015: 108.6% of GT2's (Matthew Strand)F5 race best at Runoffs 2016: 103.5% of GT2's (Steven Thompson)F5 race best at Runoffs 2017: 101.9% of GT2's (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 104.0% of GT2's (David Lapham)F5 race best at Runoffs 2019: 104.5% of GT2's (Wiley Mcmahan)F5 race best at Runoffs 2020: 105.3% of GT2's (James Weida)Off the chart: F5 race best at Runoffs 2021: 83.5% of GT2's (Sven de Vries)F5 race best at Runoffs 2022: 125.5% of GT2's (Sven de Vries)F5 qualifying best at Runoffs 2015: 107.2% of GT2's (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 103.7% of GT2's (Calvin Stewart)F5 qualifying best at Runoffs 2017: 103.2% of GT2's (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 104.7% of GT2's (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 106.5% of GT2's (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 106.5% of GT2's (Calvin Stewart)F5 qualifying best at Runoffs 2021: 103.0% of GT2's (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 105.9% of GT2's (James Weida)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
GT2SMSRF3F5solid 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
EventGT2SMSRF3F5
Qual best Race best Trap Qual best Race best Trap vs GT2 % of GT2 Qual best Race best Trap vs GT2 % of GT2 Qual best Race best Trap vs GT2 % of GT2 
Road America Runoffs 20262026-09-282:09.634John 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%)2:42.173Brett 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%)+32.075squal +32.539s124.6%qual 125.1%2:27.443Tyler Stephens · fastest of 44 · top 5 within 0.3s-0.783s (-0.53%)2:29.257Peyton Long · fastest of 42 · top 5 within 0.3s-0.582s (-0.39%)134.1Bobby Sak+0.4 mph (+0.3%)+18.607squal +17.809s114.2%qual 113.7%
17 rule changes (GT2: 13, SM: 2, SRF3: 2)3 cars added · 2 tyres & wheels · 2 weight · 1 engine · 1 induction · 1 removed · 1 wording · 6 othershowhide
  • SM Rear Toe Link #40271other
  • GT2 Panoz Esperante GTS Letter ID Number: #38494 - Additional Info #38584tyres & wheels
  • GT2 Appendix L Update #39923tyres & wheels
  • GT2 GT2 Porsche 997.2 GT3 Cup EDIT #40125other
  • GT2 Corvette C7 (14-19) L76 Specline Errors/Missing Changes #39838weight -100 lbs
  • GT2 GT2 Porsche 997.2 GT3 Cup #39936weight
  • SM Part Number Change Request #39914wording
  • GT2 Classification Request - Ginetta G56 GT4 (V8) #39625cars added
  • GT2 Remove GT3U from GCR as it is now in STU #39862removed
  • GT2 Audi R8 GT4 remove spec line notes #39864other
  • SRF3 SRF3 Spark Plugs #39899other
  • GT2 Allow Larger Air Cooled Engines in Porsche 911 GT2 #39249engine
  • GT2 Classify T1 BMW in GT2 #39408cars added
  • GT2 Additional Body Options to Replace Older Stock Car Bodies #39086other
  • GT2 GT3 Turbo to GT2? #39365induction
  • GT2 Tech Bulletins for GT2 and GT2-ST #39537cars added -100 lbs
  • SRF3 Add HD Oil Cooler #38979other
Road America Runoffs 20252025-09-292:11.807Brad 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%)2:43.111Bobby 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%)+30.983squal +31.304s123.2%qual 123.7%2:28.226Bobby Sak · fastest of 43 · top 5 within 0.6s+0.453s (+0.31%)2:29.839Morgan Burkhard · fastest of 42 · top 5 within 0.3s+1.710s (+1.15%)133.7Bobby Sak-1.5 mph (-1.1%)+16.392squal +16.419s112.3%qual 112.5%
14 rule changes (GT2: 7, SM: 4, SRF3: 3)3 aero · 2 weight · 1 cars added · 1 engine · 1 induction · 1 tyres & wheels · 1 wording · 4 othershowhide
  • SRF3 SRF Rule Updates #38853weight
  • GT2 Rear Deck Lid for Older Air-Cooled Porsche #38506aero
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • SRF3 Driver Safety & Comfort #37966other
  • SRF3 Update SADEV transmission specs #37992other
  • GT2 Hood Bulge allowed #37000engine
  • GT2 OEM Wing Adjustment #37590aero
  • GT2 GT2/ST - Remove Aftermarket/Racing ABS penalty #36538weight
  • GT2 Panoz Esperante GTS BOP #36686cars added
  • GT2 Correct language regarding OEM Areo Devices #37137aero
  • GT2 GT2 Sunbeam Tiger Alternate Carburetor #37198induction
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
Road America Runoffs 20242024-10-012:11.860Charlie 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%)2:41.106Ethan 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%)+28.175squal +29.246s121.1%qual 122.2%2:27.773Denny Stripling · fastest of 57 · top 5 within 0.3s-2.013s (-1.34%)2:28.129S Sandy Satullo III · fastest of 52 · top 5 within 0.7s-2.909s (-1.93%)135.2Denny Stripling+3.4 mph (+2.6%)+14.818squal +15.913s111.1%qual 112.1%
27 rule changes (GT2: 13, SM: 4, SRF3: 10)6 weight · 4 suspension & brakes · 3 engine · 3 tyres & wheels · 2 cars added · 2 induction · 1 aero · 3 wording · 3 othershowhide
  • SRF3 Update SRF3 Air Filter Rule #36681other
  • SRF3 Update SRF Brake Rotor Thickness #36687suspension & brakes
  • SRF3 Hoosier Tire Decal Placement #36739tyres & wheels
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • SRF3 Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels
  • SRF3 Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels
  • GT2 GT2-ST Rule Clarification #36093wording
  • GT2 GT4 cars may run in GT2-ST #36235weight
  • SRF3 SRF3 Alternator Pulley Update In #36095weight
  • GT2 Request for Spec Line 1010 Reconsideration #35009weight +300 lbs
  • GT2 Request to Eliminate the FPR from the Corvette (-2013) with LS2 #35878induction
  • GT2 Classify Corvette C8 (2020- ) into GT2/ST #33759cars added
  • GT2 Requesting classification for a 2015 Mitjet ST in GT2 #35408cars added
  • GT2 Rear Blade Spoiler Clarification #35261aero
  • GT2 GT Direct Injection allowance and rules #35437engine
  • GT2 REDUCE C6 CORVETTE WEIGHT WITH OEM 7 LITER ENGINE REDUCE BY 150LB #35385weight -150 lbs
  • GT2 GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine
  • GT2 Dodge Viper Gen 3 hybrid Kit Update Request #35200induction
  • SRF3 Update SRF Rain / Brake Rule #34706suspension & brakes
  • SRF3 Update SRF Brake Light Rule v1 #34853suspension & brakes
  • SRF3 SRF / SRF3 Rule Updates #35268weight
  • GT2 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight
  • GT2 Late E & O #34966wording
  • SRF3 SRF Radiator Rule Update #34805other
Virginia International Raceway Runoffs 20232023-09-231:52.004Barry 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%)2:14.986Danny 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%)+23.364squal +22.982s120.7%qual 120.5%2:03.842Morgan Burkhard · fastest of 40 · top 5 within 0.2s+0.126s (+0.10%)2:04.911David Ogburn · fastest of 39 · top 5 within 0.3s-17.155s (-12.08%)134.5Bobby Sak+0.1 mph (+0.0%)+12.046squal +11.838s110.7%qual 110.6%
24 rule changes (GT2: 19, SM: 1, SRF3: 4)8 induction · 5 weight · 4 tyres & wheels · 2 aero · 2 cars added · 2 engine · 1 suspension & brakesshowhide
  • GT2 GT2 Mazda 20B 3 rotor ENO #34765weight -220 lbs
  • GT2 appendix letter #33635 #34206weight
  • GT2 Remove Weight and Restrictor Penalty for Corvette C7 Body #34342weight
  • SRF3 Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • GT2 Request to class 2011 Porsche Cayman S #33771cars added
  • GT2 Please classify Fields Cardinal V8 #33784cars added
  • SRF3 Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • GT2 Adding Ginetta G56 GTA Factory ProTune for GT2 Class #33825engine
  • SRF3 Update SRF Brake Rule #33469suspension & brakes
  • SRF3 Update SRF Bodywork Fitment Rule #33765tyres & wheels
  • GT2 GT2 Mazda 13B Turbo #33729induction
  • GT2 Request Permission to Use a Substitute Turbo #33337induction
  • GT2 Request to Reduce Restriction on C7 GT2 Corvette #33342induction
  • GT2 Toyota 4A-F and 4A-FE 1.6L DOHC 16V Engine Request #33415engine
  • GT2 GT2 Mazda 13b turbocharger part # update #33437induction
  • GT2 GT2-ST BMW E36/46 spec line remove #33610aero
  • GT2 GT3 Choke option effective 1-01-2023 #33669induction
  • GT2 GT3 2.0L choke/weight option #33670weight
  • GT2 BOP adjustment for GT2 & GT2-ST #33681induction
  • SM BOP for NB1 and NB2 #32309weight
  • GT2 GT2 (TA2)/GTA Part Number Update #33315induction
  • GT2 Ginetta G56 GTA - Optional Wheels #33357tyres & wheels
  • GT2 Allow the MAShaw Body Kit on the GT2/ST Spec Line for BMW E36/E46 #32447aero
  • GT2 Request for C5/C6 Corvette Restrictor Size Review #32982induction
Virginia International Raceway Runoffs 20222022-09-241:51.086Andrew 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%)2:14.664Danny 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%)+26.059squal +23.578s123.1%qual 121.2%2:03.716Franklin Futrelle · fastest of 44 · top 5 within 0.6s-0.908s (-0.73%)2:22.066Franklin Futrelle · fastest of 40 · top 5 within 1.2s+17.311s (+13.88%)134.5David Ogburn+2.1 mph (+1.6%)+29.018squal +12.630s125.7%qual 111.4%1:57.689James Weida · fastest of 11 · top 5 within 3.9s+0.328s (+0.28%)2:21.862Sven de Vries · fastest of 10 · top 5 within 14.3s+24.290s (+20.66%)142.9Calvin Stewart+0.1 mph (+0.1%)+28.814squal +6.603s125.5%qual 105.9%
24 rule changes (GT2: 14, SM: 1, SRF3: 3, F5: 6)5 cars added · 5 induction · 4 suspension & brakes · 2 engine · 2 weight · 1 tyres & wheels · 2 wording · 3 othershowhide
  • F5 Intake Boots Correction #33028induction
  • GT2 Tail lights on all GT category race cars. #32799suspension & brakes
  • GT2 Addendum to letter #32514 Ginetta GTA G56 #33076cars added
  • F5 Ensure availability of ECU for Rotax engines #32695engine
  • GT2 Information requested for carbon roofs on BMW E36/E46 cars in GT2 #32682wording
  • GT2 Request to Allow the 95mm S54 BMW Crankshaft in GT2-ST #32698other
  • GT2 Request to classify Audi R8 FIA GT4 to GT2 #32805cars added
  • F5 Clarify stepped exhaust header references #32743engine
  • F5 593 carb boot availability and oil pump clarification #32527induction
  • SRF3 SRF Tire Rule Update #32614tyres & wheels
  • SRF3 Brake, seal, and air filter clarifications #32670suspension & brakes
  • GT2 Typo in rules for shocks #32308suspension & brakes
  • GT2 additional response to letters #31898 & 32083 #32424weight +140 lbs
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • F5 E&O class name #32194other
  • GT2 Request to Classify Ginetta G40 in GT2 #31597cars added
  • GT2 2021 Supra GR GT4 #31737cars added
  • GT2 Proposed Technical Bulletin #31900induction
  • GT2 GT2/ST Porsche Cayman #31451 correct TBR size error #31991wording
  • F5 Data Box Mounting Plate #31638other
  • GT2 Restrictor Clarification for 2015 Cayman #31451induction
  • SRF3 Three Updates to SRF Rules #31523weight
  • GT2 Turbo Request for 13B Engine #30656induction
  • GT2 Request car classification #31032cars added
Indianapolis Motor Speedway Runoffs 20212021-09-251:39.665Andrew 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 Start1:57.695Brian 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-4.676squal +18.030s96.2%qual 118.1%1:49.520Franklin Futrelle · fastest of 84 · top 5 within 0.5s-0.304s (-0.28%)1:50.095John Black · fastest of 82 · top 5 within 0.2s+0.313s (+0.29%)132.1Matthew Horst-13.418squal +9.855s89.1%qual 109.9%1:42.619Ryan Mayfield · fastest of 22 · top 5 within 1.6s-0.517s (-0.50%)1:43.140Sven de Vries · fastest of 20 · top 5 within 1.7s+0.280s (+0.27%)144.4James Weida-20.373squal +2.954s83.5%qual 103.0%
26 rule changes (GT2: 16, SM: 1, SRF3: 6, F5: 3)8 engine · 7 weight · 3 tyres & wheels · 2 cars added · 1 suspension & brakes · 2 wording · 3 othershowhide
  • GT2 Correct letter 30565 GT2/ST #31088weight
  • F5 Clarify allowable assisted shifting systems #30871wording
  • F5 Request to correct terminology #30976tyres & wheels
  • GT2 Request the 04-06 Pontiac GTO WC Car Be Added to the GT2/ST Chart #30339cars added
  • GT2 Request to Update GTA Obsolete Part Numbers #30615wording
  • GT2 GTX class correction to GT2/ST #30973cars added
  • SRF3 SRF Wet Tires #30849tyres & wheels
  • SRF3 SADEV-SRF3 Transmission #30926other
  • SRF3 SRF Update Maintenance, Repairs and Seals #30961engine
  • GT2 Porsche Cayman Engine Modification and Engine Request #30472engine
  • GT2 Request weight clarification Viper CC #30565weight
  • GT2 Variance, 2021 TA2 Rules vs GCR Appendix L #30641weight
  • F5 Request to Allow Rotax 593 HO Engine #30712engine
  • SRF3 SRF3 Alternator Pulley #30684weight
  • GT2 GT2 tiger firing order #30421engine
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • GT2 GT2-ST CORVETTE CHANGES #30029weight +100 lbs
  • GT2 Request underfloor clarification #30121tyres & wheels
  • GT2 29742 Change new wording to read as: #30329engine
  • SRF3 Mandatory identification: #30223engine
  • GT2 ABS Restrictions #30064other
  • GT2 RM 21-01 C6 & C7 clarification #30192weight
  • GT2 Request change to engine firing order rule #29742engine
  • GT2 Request E-46 BMW M3 balance of performance #29833weight -100 lbs
  • GT2 Request for Bigger Engine in Plymouth Breeze #29380engine
  • SRF3 SRF Shocks, Springs and Ride Height. #29688suspension & brakes
Road America Runoffs 20202020-10-022:12.298Andrew Aquilante · fastest of 20 · top 5 within 2.9s2:14.279Andrew Aquilante · fastest of 19 · top 5 within 2.4s162.2Scotty B White2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill+29.469squal +29.911s121.9%qual 122.6%2:29.786TJ Acker · fastest of 59 · top 5 within 0.5s2:31.038Justin Hille · fastest of 55 · top 5 within 0.2s131.9Charles Russell Turner+16.759squal +17.488s112.5%qual 113.2%2:20.954Calvin Stewart · fastest of 16 · top 5 within 1.8s2:21.391James Weida · fastest of 14 · top 5 within 1.5s143.2Aaron Ellis+7.112squal +8.656s105.3%qual 106.5%
41 rule changes (GT2: 26, SM: 2, SRF3: 7, F5: 6)8 weight · 6 engine · 5 induction · 5 suspension & brakes · 4 aero · 2 cars added · 1 tyres & wheels · 2 wording · 8 othershowhide
  • F5 Request to Update Suzuki Engine Years for F500 #29453engine
  • GT2 rescind GT2 stock car bodies removal #29219other
  • GT2 E&O Typos in Appendix L #29447wording
  • GT2 GT2 wing width wording correction #29469aero
  • SM Radiator E&O Clarifications #29294engine
  • GT2 GT Category Wording #29193induction
  • GT2 Corvette GT2-ST intake manifold #29221induction
  • GT2 997.2 E&O link to 27915 #29373other
  • GT2 Request for allowance Trans Am SGT #28951weight
  • GT2 Omitted GT2 fender/hood openings #29171other
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • F5 Request for Cockpit Adjustment of External Jetting Devices #28359other
  • F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine
  • F5 Re letter requesting driver adjustable carb mixture #28840other
  • F5 #28359 WDYT Request for Cockpit Adjustment #28875other
  • GT2 TA2 Gurney flap wicker clarification #28874aero
  • GT2 STO Gurney flap wicker clarification #28883aero
  • GT2 GT Gurney flap wicker clarification #28909aero
  • GT2 Request to Adjust Weight of OEM 8.4 Viper #28739weight -50 lbs
  • GT2 Request to Adjust Weight of OEM Chevrolet Corvette #28896weight -50 lbs
  • SRF3 SRF Shocks #28791suspension & brakes
  • GT2 Request Corvette engine parity #28576engine
  • SRF3 Update Bump Stop Rule #28712suspension & brakes
  • SRF3 SRF Bump Stop Correction #27019suspension & brakes
  • GT2 Request to revisit Panoz GT-S BoP #28280engine
  • GT2 GT2-ST Corvette LS2 & L76 #28583weight
  • GT2 GT2-ST Corvette L76 #28584weight
  • GT2 Request 991.2 Porsche engine displacement verify typo #28194engine
  • GT2 Windshield Clips #27323other
  • GT2 Request to Add Chevrolet SS Body to Appendix L #27898wording
  • F5 Change 600cc restrictor size #27883induction
  • GT2 Request Factory Five Daytona coupe classification #26308cars added
  • GT2 Porsche 991.2 GT3 Cup GT2 Classification #27701cars added
  • GT2 Request for Acura NSX Spec Line Changes #27755weight
  • GT2 GT2 991.1 restrictor size change #27914induction
  • GT2 GT2 996/997.1 weight change #27915weight -100 lbs
  • GT2 GT2/ST Corvette comp adjustment #27920induction
  • SRF3 SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • SRF3 SRF Tire Warmer Rule #27622tyres & wheels
  • SRF3 SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF3 SRF / SRF3 Majors & Regional Class Updates #27723other
Virginia International Raceway Runoffs 20192019-10-051:50.182Andrew Aquilante · fastest of 24 · top 5 within 4.5s1:52.475Andrew Aquilante · fastest of 19 · top 5 within 3.3s162.8Tom Patton2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago+23.984squal +24.370s121.3%qual 122.1%2:04.624Brian Schofield · fastest of 54 · top 5 within 0.6s2:04.755Bobby Sak · fastest of 53 · top 5 within 0.3s132.4Bobby Sak+12.280squal +14.442s110.9%qual 113.1%1:57.361Wiley Mcmahan · fastest of 15 · top 5 within 3.8s1:57.572Wiley Mcmahan · fastest of 15 · top 5 within 4.0s142.8Eric McRee+5.097squal +7.179s104.5%qual 106.5%
29 rule changes (GT2: 21, SM: 4, SRF3: 3, F5: 1)9 weight · 7 cars added · 5 engine · 2 suspension & brakes · 1 tyres & wheels · 2 wording · 3 othershowhide
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbs
  • GT2 TA2 Weight Clarification #27077weight
  • SRF3 SRF Dash Windscreen Kit #27028other
  • GT2 Request to classify Toyota Supra with 3SGTE engine #25185cars added
  • GT2 Request to Classify Acura NSX from T1 to GT2? #26121cars added
  • GT2 Request for TA2 BOP in GT2 #26509weight
  • SRF3 New SRF Sectional Nose Rule Addition #26914other
  • GT2 Request for e36/e46 bmw 4500 cc v8 at 2950lbs in GT2/ST #26106engine
  • GT2 Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine
  • GT2 Request to Classify Ligier JS2 R #26535cars added
  • SRF3 SRF Brakes and Shock Rule Changes #26629suspension & brakes
  • GT2 Request Ford Perfomance 5.2L crate engine FPR clarification #26159engine
  • GT2 Request Ride Height Clarification #26600suspension & brakes
  • GT2 Request Porsche Cayman year classification #26241other
  • GT2 GT2/ST Porsche Cayman engine #26250engine
  • SM Request to allow aftermarket fuel filters. #26370wording
  • 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
  • GT2 ST/GT2 BMW Flossman Kit Clarification #22138wording
  • GT2 Request Clarification/Revision of Appendix L (2013 TA2 Rules) #25110weight
  • GT2 Request to classify BMW E82 (1 series) into GT2 #25539cars added
  • GT2 2010 Cayman Street Tuner Into an STO Car,Addendum #25545weight
  • GT2 Request - Classify Ford Performance 5.2l #25716cars added
  • GT2 Add missing displacement, minimum weight. Remove #25765weight
  • GT2 Request for Ford FP 350s Weight Reduction #25806weight
  • GT2 Request to Classify EcoBoost Mustang #25842cars added
  • GT2 Request to Remove Mazda RX 7 Body Work Penalty #26024weight
  • GT2 GTX Homologation table update #26034cars added
Sonoma Raceway Runoffs 20182018-10-101:37.203Andrew Aquilante · fastest of 22 · top 5 within 2.1s1:38.524R Spencer Trenery · fastest of 19 · top 5 within 1.3s133.8Michael McAleenan1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn+16.754squal +17.152s117.0%qual 117.6%1:46.117Robeson Clay Russell · fastest of 36 · top 5 within 0.5s1:47.053TJ Acker · fastest of 35 · top 5 within 0.2s110.2Steve Fogg+8.529squal +8.914s108.7%qual 109.2%1:41.807Jeff Jorgenson · fastest of 5 · top 5 within 6.6s1:42.491David Lapham · fastest of 5 · top 5 within 9.5s113.3David Lapham+3.967squal +4.604s104.0%qual 104.7%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:39.919Andrew Aquilante · fastest of 36 · top 5 within 2.9s1:40.976Andrew Aquilante · fastest of 35 · top 5 within 2.6s1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+18.124squal +18.387s117.9%qual 118.4%1:49.824John Black · fastest of 101 · top 5 within 0.5s1:49.782Tray Ayres · fastest of 94 · top 5 within 0.4s+8.806squal +9.905s108.7%qual 109.9%1:43.136Wiley Clinton McMahan · fastest of 38 · top 5 within 1.4s1:42.860Wiley Clinton McMahan · fastest of 37 · top 5 within 1.6s+1.884squal +3.217s101.9%qual 103.2%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:25.405Andrew Aquilante · fastest of 21 · top 5 within 2.8s1:26.847Andrew Aquilante · fastest of 19 · top 5 within 1.5s1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+13.917squal +15.109s116.0%qual 117.7%1:34.363John Black · fastest of 41 · top 5 within 0.5s1:34.947Cliff White · fastest of 39 · top 5 within 0.3s+8.100squal +8.958s109.3%qual 110.5%1:28.528Calvin Stewart · fastest of 14 · top 5 within 3.9s1:29.853Steven Thompson · fastest of 12 · top 5 within 4.5s+3.006squal +3.123s103.5%qual 103.7%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-211:53.652Jordan Bupp · fastest of 27 · top 5 within 1.2s1:53.543Jordan Bupp · fastest of 22 · top 5 within 1.7s2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+30.524squal +25.009s126.9%qual 122.0%2:08.557Kerry Jacobsen · fastest of 29 · top 5 within 1.1s2:10.215Chad Galloway · fastest of 29 · top 5 within 0.3s+16.672squal +14.905s114.7%qual 113.1%2:01.824W. Clint McMahan · fastest of 16 · top 5 within 3.0s2:03.298Matthew Strand · fastest of 15 · top 5 within 4.9s+9.755squal +8.172s108.6%qual 107.2%

By track

TrackEvents Typical % of GT2 Best Latest 
Road America4100.0%100.0%Runoffs 2020100.0%Runoffs 2026
Virginia International Raceway3100.0%100.0%Runoffs 2019100.0%Runoffs 2023
Indianapolis Motor Speedway2100.0%100.0%Runoffs 2017100.0%Runoffs 2021
Daytona International Speedway1100.0%100.0%Runoffs 2015100.0%Runoffs 2015
Mid-Ohio Sports Car Course1100.0%100.0%Runoffs 2016100.0%Runoffs 2016
Sonoma Raceway1100.0%100.0%Runoffs 2018100.0%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.