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BoP Lab / Classes / GT1

GT1 vs F5 vs SM pace at every track

Lap times across years say as much about the weather as the class. % of GT1 is each class's best lap as a share of GT1'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)
AS+B-Spec+EP+vsF5×FA+FC+FE2+FF+FP+FV+FX+GT1×GT2+GTX+HP+P+P2+vsSM×SMX+SRF3+STL+STU+T1+T2+T3+T4+Show 50 inactive classes
Series
Reference class · the yardstick the % column and chart are measured against
Tracks · untick to narrow

Quickest here: GT1 1:21.927 Cliff Ebben, Runoffs 2016 qualifying · F5 1:28.528 Calvin Stewart, Runoffs 2016 qualifying · SM 1:40.514 Justin Hille, Runoffs 2016 qualifying

1:201:402:002:202:4011 rule changes between Runoffs 2018 and Runoffs 201911 ▾20 rule changes between Runoffs 2019 and Runoffs 202020 ▾5 rule changes between Runoffs 2020 and Runoffs 20215 ▾13 rule changes between Runoffs 2021 and Runoffs 202213 ▾8 rule changes between Runoffs 2022 and Runoffs 20238 ▾12 rule changes between Runoffs 2023 and Runoffs 202412 ▾11 rule changes between Runoffs 2024 and Runoffs 202511 ▾11 rule changes between Runoffs 2025 and Runoffs 202611 ▾GT1 race best at Runoffs 2015: 1:47.116 (Michael Lewis)GT1 race best at Runoffs 2016: 1:22.866 (Michael Lewis)GT1 race best at Runoffs 2017: 1:36.187 (Cliff Ebben)GT1 race best at Runoffs 2018: 1:37.516 (Michael Lewis)GT1 race best at Runoffs 2019: 1:48.562 (Tony Ave)GT1 race best at Runoffs 2020: 2:05.282 (Ernie Francis Jr)GT1 race best at Runoffs 2021: 1:53.220 (David Pintaric)GT1 race best at Runoffs 2022: 2:18.094 (David Pintaric)GT1 race best at Runoffs 2024: 2:06.893 (Dave Ruehlow)GT1 race best at Runoffs 2025: 2:04.058 (Tony Ave)GT1 race best at Runoffs 2026: 2:04.611 (Tony Ave)GT1 qualifying best at Runoffs 2015: 1:44.244 (Michael Lewis)GT1 qualifying best at Runoffs 2016: 1:21.927 (Cliff Ebben)GT1 qualifying best at Runoffs 2017: 1:36.008 (David Pintaric)GT1 qualifying best at Runoffs 2018: 1:35.673 (Michael Lewis)GT1 qualifying best at Runoffs 2019: 1:43.857 (Tony Ave)GT1 qualifying best at Runoffs 2020: 2:02.936 (Ernie Francis Jr)GT1 qualifying best at Runoffs 2021: 1:35.279 (Michael Lewis)GT1 qualifying best at Runoffs 2022: 1:46.808 (David Pintaric)GT1 qualifying best at Runoffs 2023: 1:48.203 (David Pintaric)GT1 qualifying best at Runoffs 2024: 2:02.535 (Dave Ruehlow)GT1 qualifying best at Runoffs 2025: 2:01.273 (Tony Ave)GT1 qualifying best at Runoffs 2026: 2:02.981 (Tony Ave)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)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)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
GT1F5SMsolid race · dashed qualifying · slower is lower
100%110%120%130%11 rule changes between Runoffs 2018 and Runoffs 201911 ▾20 rule changes between Runoffs 2019 and Runoffs 202020 ▾5 rule changes between Runoffs 2020 and Runoffs 20215 ▾13 rule changes between Runoffs 2021 and Runoffs 202213 ▾8 rule changes between Runoffs 2022 and Runoffs 20238 ▾12 rule changes between Runoffs 2023 and Runoffs 202412 ▾11 rule changes between Runoffs 2024 and Runoffs 202511 ▾11 rule changes between Runoffs 2025 and Runoffs 202611 ▾GT1 race best at Runoffs 2015: 100.0% of GT1's (Michael Lewis)GT1 race best at Runoffs 2016: 100.0% of GT1's (Michael Lewis)GT1 race best at Runoffs 2017: 100.0% of GT1's (Cliff Ebben)GT1 race best at Runoffs 2018: 100.0% of GT1's (Michael Lewis)GT1 race best at Runoffs 2019: 100.0% of GT1's (Tony Ave)GT1 race best at Runoffs 2020: 100.0% of GT1's (Ernie Francis Jr)GT1 race best at Runoffs 2021: 100.0% of GT1's (David Pintaric)GT1 race best at Runoffs 2022: 100.0% of GT1's (David Pintaric)GT1 race best at Runoffs 2024: 100.0% of GT1's (Dave Ruehlow)GT1 race best at Runoffs 2025: 100.0% of GT1's (Tony Ave)GT1 race best at Runoffs 2026: 100.0% of GT1's (Tony Ave)GT1 qualifying best at Runoffs 2015: 100.0% of GT1's (Michael Lewis)GT1 qualifying best at Runoffs 2016: 100.0% of GT1's (Cliff Ebben)GT1 qualifying best at Runoffs 2017: 100.0% of GT1's (David Pintaric)GT1 qualifying best at Runoffs 2018: 100.0% of GT1's (Michael Lewis)GT1 qualifying best at Runoffs 2019: 100.0% of GT1's (Tony Ave)GT1 qualifying best at Runoffs 2020: 100.0% of GT1's (Ernie Francis Jr)GT1 qualifying best at Runoffs 2021: 100.0% of GT1's (Michael Lewis)GT1 qualifying best at Runoffs 2022: 100.0% of GT1's (David Pintaric)GT1 qualifying best at Runoffs 2023: 100.0% of GT1's (David Pintaric)GT1 qualifying best at Runoffs 2024: 100.0% of GT1's (Dave Ruehlow)GT1 qualifying best at Runoffs 2025: 100.0% of GT1's (Tony Ave)GT1 qualifying best at Runoffs 2026: 100.0% of GT1's (Tony Ave)F5 race best at Runoffs 2015: 115.1% of GT1's (Matthew Strand)F5 race best at Runoffs 2016: 108.4% of GT1's (Steven Thompson)F5 race best at Runoffs 2017: 106.9% of GT1's (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 105.1% of GT1's (David Lapham)F5 race best at Runoffs 2019: 108.3% of GT1's (Wiley Mcmahan)F5 race best at Runoffs 2020: 112.9% of GT1's (James Weida)Off the chart: F5 race best at Runoffs 2021: 91.1% of GT1's (Sven de Vries)F5 race best at Runoffs 2022: 102.7% of GT1's (Sven de Vries)F5 qualifying best at Runoffs 2015: 116.9% of GT1's (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 108.1% of GT1's (Calvin Stewart)F5 qualifying best at Runoffs 2017: 107.4% of GT1's (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 106.4% of GT1's (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 113.0% of GT1's (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 114.7% of GT1's (Calvin Stewart)F5 qualifying best at Runoffs 2021: 107.7% of GT1's (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 110.2% of GT1's (James Weida)SM race best at Runoffs 2015: 134.5% of GT1's (Todd Lamb)SM race best at Runoffs 2016: 121.6% of GT1's (Michael Carter)SM race best at Runoffs 2017: 123.8% of GT1's (Michael Gagliardo)SM race best at Runoffs 2018: 118.2% of GT1's (Michael Carter)SM race best at Runoffs 2019: 125.7% of GT1's (Elivan Goulart)SM race best at Runoffs 2020: 130.7% of GT1's (Preston Pardus)SM race best at Runoffs 2021: 105.0% of GT1's (Brian Henderson)SM race best at Runoffs 2022: 100.7% of GT1's (Travis Wiley)SM race best at Runoffs 2024: 127.3% of GT1's (Brett Kowalski)SM race best at Runoffs 2025: 132.5% of GT1's (Kyle Greenhill)SM race best at Runoffs 2026: 130.6% of GT1's (Francisco Barroso)SM qualifying best at Runoffs 2015: 133.0% of GT1's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 122.7% of GT1's (Justin Hille)SM qualifying best at Runoffs 2017: 123.2% of GT1's (Chris Haldeman)SM qualifying best at Runoffs 2018: 119.5% of GT1's (Ken Sutherland)SM qualifying best at Runoffs 2019: 129.6% of GT1's (Todd Buras)SM qualifying best at Runoffs 2020: 131.9% of GT1's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 123.5% of GT1's (Brian Henderson)SM qualifying best at Runoffs 2022: 126.1% of GT1's (Danny Steyn)SM qualifying best at Runoffs 2023: 124.8% of GT1's (Danny Steyn)SM qualifying best at Runoffs 2024: 131.5% of GT1's (Ethan Goulart)SM qualifying best at Runoffs 2025: 134.5% of GT1's (Bobby Gossett)SM qualifying best at Runoffs 2026: 131.9% of GT1's (Brett Kowalski)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
GT1F5SMsolid race · dashed qualifying · each class's best lap as a share of GT1's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventGT1F5SM
Qual bestRace bestTrapQual bestRace bestTrapvs GT1% of GT1Qual bestRace bestTrapvs GT1% of GT1
Road America Runoffs 20262026-09-282:02.981Tony Ave · fastest of 12 · top 5 within 4.6s+1.708s (+1.41%)2:04.611Tony Ave · fastest of 12 · top 5 within 3.9s+0.553s (+0.45%)177.9Tony Ave-2.7 mph (-1.5%)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%)+38.114squal +39.192s130.6%qual 131.9%
11 rule changes (GT1: 9, SM: 2)5 cars added · 3 weight · 2 wording · 1 other · GT1 Porsche T/A Cup renamed T/A Cup, retains 1-11/16 inch flat plate, must run T/A Cup rule set. · GT1 adds T/A Porsche Cup with 1-11/16 inch max flat plate, must run T/A Porsche Cup rule set. · GT1 Lamborghini Huracan Trofeo, Evo 2, Evo 3 added; all three allowed to compete at as-run weight. · SM/SMX Mazda rear toe link part number revised from 0000-04-5361426 to 0000-04-5361. · GT1-ST Lamborghini Huracán GT3 (2019–) minimum weight reduced to 2950 lbs. · SM/SMX part number 0000-10-6900 replaced with 0000-06-5016-KT in GCR 9.1.7.C.1.j.1.c. · GT1 GM 275ci carbureted V6 minimum weight reduced to 2295 lbs. · GT3U class removed from GCR; GT3U cars now compete in STU. · GT1 adds Porsche 992.1 GT3 Cup 2022–2025 with OEM ABS, traction control, RSR bumper, canards, and any exhaust. · GT1-ST Acura NSX GT3 EVO 22 minimum weight drops 100 lbs to 3000. · Acura NSX GT3 EVO 22 reclassified from GT1 to GT1-ST, 3500cc, 3100 lbs minimum weight.showhide
  • GT1 Request TA Cup Cars Into GT1 #40250wordingwordingGT1 Porsche T/A Cup renamed T/A Cup, retains 1-11/16 inch flat plate, must run T/A Cup rule set.
  • GT1 Request TA Cup Cars Into GT1 #40250cars addedaddedGT1 adds T/A Porsche Cup with 1-11/16 inch max flat plate, must run T/A Porsche Cup rule set.
  • GT1 Lamborghini Huracan Super Trofeo in GT1 #40288cars addedaddedGT1 Lamborghini Huracan Trofeo, Evo 2, Evo 3 added; all three allowed to compete at as-run weight.
  • SM Rear Toe Link #40271wordingwordingSM/SMX Mazda rear toe link part number revised from 0000-04-5361426 to 0000-04-5361.
  • GT1 Request for Huracan GT3 Evo Weight Reduction to 2950lbs #40147weight -50 lbsfaster · weightGT1-ST Lamborghini Huracán GT3 (2019–) minimum weight reduced to 2950 lbs.
  • SM Part Number Change Request #39914otherunclearSM/SMX part number 0000-10-6900 replaced with 0000-06-5016-KT in GCR 9.1.7.C.1.j.1.c.
  • GT1 Reduce Weight for GM 275ci Carbureted V6s #39713weightfaster · weightGT1 GM 275ci carbureted V6 minimum weight reduced to 2295 lbs.
  • GT1 Remove GT3U from GCR as it is now in STU #39862cars addedremoved · cars addedGT3U class removed from GCR; GT3U cars now compete in STU.
  • GT1 Request for Addition of Porsche 992.1 GT3 Cup into GT1 #39322cars addedaddedGT1 adds Porsche 992.1 GT3 Cup 2022–2025 with OEM ABS, traction control, RSR bumper, canards, and any exhaust.
  • GT1 NSX Parity With Other GT3s Let Alone a GT1 Car #39311weight -100 lbsfaster · weightGT1-ST Acura NSX GT3 EVO 22 minimum weight drops 100 lbs to 3000.
  • GT1 RM 25-06 GT1 reclassify the Acura NSX GT3 EVO 22 to GT1-ST #39101cars addedaddedAcura NSX GT3 EVO 22 reclassified from GT1 to GT1-ST, 3500cc, 3100 lbs minimum weight.
Road America Runoffs 20252025-09-292:01.273Tony Ave · fastest of 14 · top 5 within 7.7s-1.262s (-1.03%)2:04.058Tony Ave · fastest of 12 · top 5 within 5.8s-2.835s (-2.23%)180.6Dave Ruehlow-0.4 mph (-0.2%)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%)+40.372squal +41.838s132.5%qual 134.5%
11 rule changes (GT1: 7, SM: 4)3 cars added · 1 engine · 1 induction · 4 wording · 2 other · GT1 LS Limited Prep engine expanded to include LS2, LS3, LS6 alongside LS1; compression ratio capped at 11:1. · SMX drivers must submit data acquisition files on time or face suspension and $250 fine. · SMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fines, level 2 and 4 may carry $500 fines. · SM tire marking rules clarified: one Hoosier SM 7.5 P205/50/ZR17 set per Super Tour weekend, impound after first dry session, damaged tires may be replaced with used tires only. · Acura NSX GT3 EVO 22 classified in GT1 with 3500cc twin turbo crossflow V-6, 3100 lbs, 7500 rpm max. · GT1 LS1 Limited Prep engine added, 2600 lbs with driver, 383 cubic inches maximum, hydraulic roller cam, 750 cfm carb. · TA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof height limit. · GT1-ST restrictor specifications removed for 13 cars; new values not provided. · GT1-ST Lamborghini Huracán GT3 Evo and GT3 both move to unrestricted intake, replacing 39mm and 52mm restrictors. · SMX OE instrument cluster must stay unmodified and connected; aftermarket dash allowed if wiring only re-routed; alternate gauges now permitted; foot pedal comfort mods allowed without relocation. · GT1 Mazda 26B engine approved; minimum weight set to 2850 lbs.showhide
  • GT1 Correction to Limited prep LS Chevy engine for GT1 #38902engineadded · engineGT1 LS Limited Prep engine expanded to include LS2, LS3, LS6 alongside LS1; compression ratio capped at 11:1.
  • SM SMX Data Submission - Penalties #38248otheraddedSMX drivers must submit data acquisition files on time or face suspension and $250 fine.
  • SM Committee) SMX Penaly Clarification updated language #38337wordingwordingSMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fines, level 2 and 4 may carry $500 fines.
  • SM Clarify Tire Marking Regs #38005wordingwordingSM tire marking rules clarified: one Hoosier SM 7.5 P205/50/ZR17 set per Super Tour weekend, impound after first dry session, damaged tires may be replaced with used tires only.
  • GT1 Request to Classify Acura NSX GT3 Evo 22 #37367cars addedaddedAcura NSX GT3 EVO 22 classified in GT1 with 3500cc twin turbo crossflow V-6, 3100 lbs, 7500 rpm max.
  • GT1 Addition of a limited prep LS Chevy engine for GT1 #37045cars addedaddedGT1 LS1 Limited Prep engine added, 2600 lbs with driver, 383 cubic inches maximum, hydraulic roller cam, 750 cfm carb.
  • GT1 Correct language regarding OEM Areo Devices #37137wordingwordingTA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof height limit.
  • GT1 GT1-ST Adjustments #37481otherunclearGT1-ST restrictor specifications removed for 13 cars; new values not provided.
  • GT1 Lamborghini Huracan GT3 Evo Restrictor Help #36254inductionfaster · inductionGT1-ST Lamborghini Huracán GT3 Evo and GT3 both move to unrestricted intake, replacing 39mm and 52mm restrictors.
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070wordingwordingSMX OE instrument cluster must stay unmodified and connected; aftermarket dash allowed if wiring only re-routed; alternate gauges now permitted; foot pedal comfort mods allowed without relocation.
  • GT1 Request to Classify Mazda 26B Engine #36230cars addedaddedGT1 Mazda 26B engine approved; minimum weight set to 2850 lbs.
Road America Runoffs 20242024-10-012:02.535Dave Ruehlow · fastest of 10 · top 5 within 4.6s-0.401s (-0.33%)2:06.893Dave Ruehlow · fastest of 6 · top 5 within 50.8s+1.611s (+1.29%)181.0Dave Ruehlow+0.5 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%)+34.593squal +38.571s127.3%qual 131.5%
12 rule changes (GT1: 8, SM: 4)4 engine · 1 aero · 1 cars added · 1 weight · 4 wording · 1 other · SMX Spec MX-5 camera requirement: non-functioning recorder now will instead of may warrant penalty or disqualification. · SM and SMX must run latest AIM Data Logger Spec MX-5 ECU Protocol, effective 2024-09-01. · SMX Mazda MX-5 OE versus OEM definitions clarified in GCR section 9.1.7.1; wording change only. · SM and SMX now allow an alternate shifter bushing at the bottom of the shift lever. · GT2-ST Acura NSX minimum weight rises to 3000 lbs, restrictor increases to 45mm TIR. · GT1 Camaro 1993-2002 model years specified in GCR 9.1.2.E.1.b.3. · GT1-GTX rear blade spoiler: angle 50–75°, max 59.0 wide by 5.0 high inches; total area limit removed. · GT1, GT2, GT3, GTL, GTX Direct Injection now permitted if original equipment. · GT2 Nissan and GT3 Mazda, Mitsubishi 4G93, Nissan QR25DE/DD, QE25DE/DD now permit Direct Injection per 9.1.2.F.7.5.E. · GT1-ST adds Lamborghini Huracan GT3 EVO(1) 2018- at 3000 lbs, X39mm restrictor, and Huracan GT3 2019- at 3100 lbs, 52mm restrictor. · GT1 Trick Flow Specialties Ultra 18 Degree GM Cylinder Head Part #TFS-3181T001-CO1 allowed. · GTL spec lines moved contiguous with GT2 and GT3; GTA category and specs renumbered behind GTL; P2 engine tables reorganised with restrictor and weight specifications clarified.showhide
  • SM SMX Camera Rule Correction #36496wordingwordingSMX Spec MX-5 camera requirement: non-functioning recorder now will instead of may warrant penalty or disqualification.
  • SM Committee) AIM ECU Protocol #36556engineadded · engineSM and SMX must run latest AIM Data Logger Spec MX-5 ECU Protocol, effective 2024-09-01.
  • SM Committee) OE versus OEM Definitons #36608wordingwordingSMX Mazda MX-5 OE versus OEM definitions clarified in GCR section 9.1.7.1; wording change only.
  • SM Committee) Shifter Bushing #36611otheraddedSM and SMX now allow an alternate shifter bushing at the bottom of the shift lever.
  • GT1 Request for Spec Line 1010 Reconsideration #35009weight +300 lbsslower · weightGT2-ST Acura NSX minimum weight rises to 3000 lbs, restrictor increases to 45mm TIR.
  • GT1 Camaro 1993- and 2010- #35652wordingwordingGT1 Camaro 1993-2002 model years specified in GCR 9.1.2.E.1.b.3.
  • GT1 Rear Blade Spoiler Clarification #35261aeroaeroGT1-GTX rear blade spoiler: angle 50–75°, max 59.0 wide by 5.0 high inches; total area limit removed.
  • GT1 GT Direct Injection allowance and rules #35437engineadded · engineGT1, GT2, GT3, GTL, GTX Direct Injection now permitted if original equipment.
  • GT1 GT2/3 remove Direction Injection not allowed in Spec line notes #35439engineadded · engineGT2 Nissan and GT3 Mazda, Mitsubishi 4G93, Nissan QR25DE/DD, QE25DE/DD now permit Direct Injection per 9.1.2.F.7.5.E.
  • GT1 Request for Acceptance of Lamborghini Huracan GT3 in GT1-ST #34929cars addedaddedGT1-ST adds Lamborghini Huracan GT3 EVO(1) 2018- at 3000 lbs, X39mm restrictor, and Huracan GT3 2019- at 3100 lbs, 52mm restrictor.
  • GT1 Cylinder heads #35040engineadded · engineGT1 Trick Flow Specialties Ultra 18 Degree GM Cylinder Head Part #TFS-3181T001-CO1 allowed.
  • GT1 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453wordingwordingGTL spec lines moved contiguous with GT2 and GT3; GTA category and specs renumbered behind GTL; P2 engine tables reorganised with restrictor and weight specifications clarified.
Virginia International Raceway Runoffs 20232023-09-231:48.203David Pintaric · fastest of 5 · top 5 within 22.4s+1.395s (+1.31%)178.1David Pintaric-3.6 mph (-2.0%)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%)+26.783s qual124.8% qual
8 rule changes (GT1: 7, SM: 1)4 weight · 2 cars added · 2 wording · Fields Cardinal V8 added to GT1 with Ford V8 engine, 4.9L, 2100 lbs, fuel injection. · GT1 Mercedes AMG GT3 16-19 notes clarify FIA GT3 homologation compliance. · GT1 sequential transmission weight penalty reduced from 50 lbs to 25 lbs. · GT1-ST Porsche 992 GT3 Cup added with 3997cc displacement, 2950 lb minimum weight, no restrictor. · SM Mazda MX-5 Miata 01-05 minimum weight rises to 2450 lbs, or 2465 with alternate bore. · GT2 TA2 and GTA throttle body part numbers updated to GM 12570790 or Edelbrock 33869/3870. · GT1 Trans Am bodywork weight penalty reduced from 100 lbs to 75 lbs. · GT1 Chevrolet RO7, Ford FR9, and Dodge R7 weight penalties cut from 50 lbs to 25 lbs each.showhide
  • GT1 Please classify Fields Cardinal V8 #33784cars addedaddedFields Cardinal V8 added to GT1 with Ford V8 engine, 4.9L, 2100 lbs, fuel injection.
  • GT1 Mercedes AMG GT3 Notes #33804wordingwordingGT1 Mercedes AMG GT3 16-19 notes clarify FIA GT3 homologation compliance.
  • GT1 Sequential Transmission Weight Penalty #33503weightfaster · weightGT1 sequential transmission weight penalty reduced from 50 lbs to 25 lbs.
  • GT1 GT1 Porsche 992 #33730cars addedaddedGT1-ST Porsche 992 GT3 Cup added with 3997cc displacement, 2950 lb minimum weight, no restrictor.
  • SM BOP for NB1 and NB2 #32309weightslower · weightSM Mazda MX-5 Miata 01-05 minimum weight rises to 2450 lbs, or 2465 with alternate bore.
  • GT1 GT2 (TA2)/GTA Part Number Update #33315wordingwordingGT2 TA2 and GTA throttle body part numbers updated to GM 12570790 or Edelbrock 33869/3870.
  • GT1 Request to Reduce Trans Am Bodywork Weight Penalty #33331weightfaster · weightGT1 Trans Am bodywork weight penalty reduced from 100 lbs to 75 lbs.
  • GT1 Request for Reduction in FR9 Weight Penalty #33332weightfaster · weightGT1 Chevrolet RO7, Ford FR9, and Dodge R7 weight penalties cut from 50 lbs to 25 lbs each.
Virginia International Raceway Runoffs 20222022-09-241:46.808David Pintaric · fastest of 8 · top 5 within 3.7s+2.951s (+2.84%)2:18.094David Pintaric · fastest of 7 · top 5 within 13.7s+29.532s (+27.20%)181.7Adam Romito-1.5 mph (-0.8%)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%)+3.768squal +10.881s102.7%qual 110.2%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%)+1.013squal +27.856s100.7%qual 126.1%
13 rule changes (GT1: 6, F5: 6, SM: 1)3 cars added · 2 tyres & wheels · 1 engine · 5 wording · 2 other · F500 Rotax 493 and 593 intake boots: removed Moto Tassinari V3124-873B-2 from 493/593 non-HO allowance, added Moto Tassinari V3120-794A-2 option for non-HO. · GT1, GT2, GT3, GTL, GTX tail lights may now be original style or custom panel graphic with functioning red LED brake lamps. · F500 Rotax engines now permit Ingi Tech Sparker ignition DCP-CDI-P2 as alternate ECU. · GT1 allows current Trans Am bodywork with 100 lb weight penalty. · F500 clarifies stepped diameter exhaust headers prohibited except at cylinder head flange area. · F500 Rotax 593 intake boot options clarified; oil injection pump removal now permitted. · SM Majors must run authorized Penske shock and mount; Regional competitors not required until further evaluation. · F500 Majors and Runoffs cars must install AIM part #X47KPFSOLO2R0 data box mount for Solo or Solo 2. · GT1 Mercedes Benz AMG GT3 added, 3050 lbs, 6208cc V8, 40mm restrictors, FIA GT3 homologation. · GT1 wheel width limits change: 12in front/13in rear standard, 18in wheels get 13in front/14in rear maximum. · GT1 allows 17-inch wheels; 18-inch wheels now permitted with 50 lb penalty; 18-inch tyres use 13-inch front, 14-inch rear width. · F5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors and Runoffs. · GT3 Volkswagen Fun Cup Beetle EVO3 classified, sealed SOHC 1984cc engine, 2060 lbs minimum weight.showhide
  • F5 Intake Boots Correction #33028wordingwordingF500 Rotax 493 and 593 intake boots: removed Moto Tassinari V3124-873B-2 from 493/593 non-HO allowance, added Moto Tassinari V3120-794A-2 option for non-HO.
  • GT1 Tail lights on all GT category race cars. #32799wordingwordingGT1, GT2, GT3, GTL, GTX tail lights may now be original style or custom panel graphic with functioning red LED brake lamps.
  • F5 Ensure availability of ECU for Rotax engines #32695engineadded · engineF500 Rotax engines now permit Ingi Tech Sparker ignition DCP-CDI-P2 as alternate ECU.
  • GT1 GT-1/TransAm rules simplification/modernizing #32763cars addedaddedGT1 allows current Trans Am bodywork with 100 lb weight penalty.
  • F5 Clarify stepped exhaust header references #32743wordingwordingF500 clarifies stepped diameter exhaust headers prohibited except at cylinder head flange area.
  • F5 593 carb boot availability and oil pump clarification #32527wordingwordingF500 Rotax 593 intake boot options clarified; oil injection pump removal now permitted.
  • SM Update GCR Section 9.1.7.3.A.1. #32217wordingwordingSM Majors must run authorized Penske shock and mount; Regional competitors not required until further evaluation.
  • F5 E&O class name #32194otheraddedF500 Majors and Runoffs cars must install AIM part #X47KPFSOLO2R0 data box mount for Solo or Solo 2.
  • GT1 Mercedes Benz AMG GT3 in GT1 #31883cars addedaddedGT1 Mercedes Benz AMG GT3 added, 3050 lbs, 6208cc V8, 40mm restrictors, FIA GT3 homologation.
  • GT1 Wheel Widths #32205tyres & wheelstyres & wheelsGT1 wheel width limits change: 12in front/13in rear standard, 18in wheels get 13in front/14in rear maximum.
  • GT1 Wheel Widths #31844tyres & wheelsadded · tyres & wheelsGT1 allows 17-inch wheels; 18-inch wheels now permitted with 50 lb penalty; 18-inch tyres use 13-inch front, 14-inch rear width.
  • F5 Data Box Mounting Plate #31638otheraddedF5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors and Runoffs.
  • GT1 Request car classification #31032cars addedaddedGT3 Volkswagen Fun Cup Beetle EVO3 classified, sealed SOHC 1984cc engine, 2060 lbs minimum weight.
Indianapolis Motor Speedway Runoffs 20212021-09-251:35.279Michael Lewis · fastest of 20 · top 5 within 0.6s-0.729s (-0.76%)1:53.220David Pintaric · fastest of 14 · top 5 within 3.8s+17.033s (+17.71%)180.2Tom Smith1:42.619Ryan 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-10.080squal +7.340s91.1%qual 107.7%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+5.617squal +22.416s105.0%qual 123.5%
5 rule changes (GT1: 1, F5: 3, SM: 1)1 cars added · 4 wording · F5 clarifies mechanical shifting only; throttle-cut and flat-shifter devices permitted if driver retains full control. · F5 single-seat open-wheel cars: rigid suspension becomes limited suspension in class definition. · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two locations and 6010 to 6014X in TA2 Appendix. · F500 Rotax 593 HO engine now permitted; 875 lbs minimum weight, MA0242SP1020A or MA0242SP1063A restrictor, specific intake boots and piston required. · SM adds procedure for CRB-approved obsolete parts and BOP testing in sanctioned events with point forfeiture.showhide
  • F5 Clarify allowable assisted shifting systems #30871wordingwordingF5 clarifies mechanical shifting only; throttle-cut and flat-shifter devices permitted if driver retains full control.
  • F5 Request to correct terminology #30976wordingwordingF5 single-seat open-wheel cars: rigid suspension becomes limited suspension in class definition.
  • GT1 Request to Update GTA Obsolete Part Numbers #30615wordingwordingGTA part numbers updated: 0-80541-1 to 0-80541-2 in two locations and 6010 to 6014X in TA2 Appendix.
  • F5 Request to Allow Rotax 593 HO Engine #30712cars addedaddedF500 Rotax 593 HO engine now permitted; 875 lbs minimum weight, MA0242SP1020A or MA0242SP1063A restrictor, specific intake boots and piston required.
  • SM Updates - Obsolete Parts & BOP Parts #30438wordingaddedSM adds procedure for CRB-approved obsolete parts and BOP testing in sanctioned events with point forfeiture.
Road America Runoffs 20202020-10-022:02.936Ernie Francis Jr · fastest of 16 · top 5 within 3.4s2:05.282Ernie Francis Jr · fastest of 16 · top 5 within 3.4s180.5Simon Gregg2:20.954Calvin Stewart · fastest of 16 · top 5 within 1.8s2:21.391James Weida · fastest of 14 · top 5 within 1.5s143.2Aaron Ellis+16.109squal +18.018s112.9%qual 114.7%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+38.466squal +39.273s130.7%qual 131.9%
20 rule changes (GT1: 12, F5: 6, SM: 2)4 cars added · 2 engine · 2 weight · 1 induction · 1 suspension & brakes · 9 wording · 1 other · F500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019. · SM allows aftermarket radiators in original location with stock OEM cooling fan, and permits 1990-1997 cars to install upper radiator seal NA75-50-OK7A. · GT1/GT2/GT3/GTL/GTX turbocharging and supercharging now permitted if listed on spec line. · GT1 adds Trans Am spec engines: Chevrolet R07, Ford FR9, Dodge R7, each at base weight plus 50 lbs. · SM rear brake caliper may use single bracket under upper retaining bolt head to prevent pin failure. · F5 request to adjust external jetting device cockpit control denied; no rule change made. · F5 driver adjustable carburettor mixture: refer to separate Fastrack letter #28359 for ruling. · F5 cockpit adjustment request response published in Fastrack letter 28359. · TA2 Gurney flap wording clarified: replace 'wicker bill' and 'wicker' with 'Gurney flap' throughout wing specifications. · STO rear wing rules clarify that wicker is called Gurney flap in two places; no performance change. · GT1 Gurney flap and wickerbill terminology clarified: 'lips' and 'tabs' and 'wicker' standardized to 'flaps' throughout section D and E. · GT Gurney flap wording clarified: wickerbill and tab terminology replaced with Gurney flap throughout sections 9.1.2.F.7.b. · GT1, GT2, GT3, GTL, GTX may use bonded-glass factory windshields without clips or straps if attached per original specifications. · F500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced to 28mm from 29mm. · GT2/ST Ford Coyote 5.0L third generation OEM gains Boss intake manifold option at 3200 lbs minimum. · GTX Misc. adds Factory Five Type 65 Coupe R Ford 302/351 and 5.0/5.2L NA at 2600 lbs, plus Ferrari 458/488 Challenge, Ford FP350S, Chevrolet C6, Lamborghini Super Trofeo. · GT1 sequential shifting transmissions weight penalty reduced from 75 lbs to 50 lbs. · GT1 cars not specified for 18 inch wheels now have 50 pound penalty, down from 100. · GT1 adds 5 Star NASCAR Camaro 2018 and later body as allowed bodywork option.showhide
  • F5 Request to Update Suzuki Engine Years for F500 #29453engineadded · engineF500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019.
  • SM Radiator E&O Clarifications #29294wordingwordingSM allows aftermarket radiators in original location with stock OEM cooling fan, and permits 1990-1997 cars to install upper radiator seal NA75-50-OK7A.
  • GT1 GT Category Wording #29193wordingaddedGT1/GT2/GT3/GTL/GTX turbocharging and supercharging now permitted if listed on spec line.
  • GT1 Request to Allow New Trans Am Legal Engines in GT1 #29002cars addedaddedGT1 adds Trans Am spec engines: Chevrolet R07, Ford FR9, Dodge R7, each at base weight plus 50 lbs.
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakessuspension & brakesSM rear brake caliper may use single bracket under upper retaining bolt head to prevent pin failure.
  • F5 Request for Cockpit Adjustment of External Jetting Devices #28359wordingunclearF5 request to adjust external jetting device cockpit control denied; no rule change made.
  • F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine
  • F5 Re letter requesting driver adjustable carb mixture #28840wordingunclearF5 driver adjustable carburettor mixture: refer to separate Fastrack letter #28359 for ruling.
  • F5 #28359 WDYT Request for Cockpit Adjustment #28875wordingunclearF5 cockpit adjustment request response published in Fastrack letter 28359.
  • GT1 TA2 Gurney flap wicker clarification #28874wordingwordingTA2 Gurney flap wording clarified: replace 'wicker bill' and 'wicker' with 'Gurney flap' throughout wing specifications.
  • GT1 STO Gurney flap wicker clarification #28883wordingwordingSTO rear wing rules clarify that wicker is called Gurney flap in two places; no performance change.
  • GT1 GT1 Gurney flap wicker clarification #28886wordingwordingGT1 Gurney flap and wickerbill terminology clarified: 'lips' and 'tabs' and 'wicker' standardized to 'flaps' throughout section D and E.
  • GT1 GT Gurney flap wicker clarification #28909wordingwordingGT Gurney flap wording clarified: wickerbill and tab terminology replaced with Gurney flap throughout sections 9.1.2.F.7.b.
  • GT1 Windshield Clips #27323otheraddedGT1, GT2, GT3, GTL, GTX may use bonded-glass factory windshields without clips or straps if attached per original specifications.
  • F5 Change 600cc restrictor size #27883inductionslower · inductionF500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced to 28mm from 29mm.
  • GT1 Request to classify the Ford Coyote 3rd Gen OEM #27146cars addedaddedGT2/ST Ford Coyote 5.0L third generation OEM gains Boss intake manifold option at 3200 lbs minimum.
  • GT1 Request Factory Five Daytona coupe classification #26308cars addedaddedGTX Misc. adds Factory Five Type 65 Coupe R Ford 302/351 and 5.0/5.2L NA at 2600 lbs, plus Ferrari 458/488 Challenge, Ford FP350S, Chevrolet C6, Lamborghini Super Trofeo.
  • GT1 Request to Adjust Transmission Penalty #27750weightfaster · weightGT1 sequential shifting transmissions weight penalty reduced from 75 lbs to 50 lbs.
  • GT1 Request to Reduce Additional Weight for 18 #27751weightfaster · weightGT1 cars not specified for 18 inch wheels now have 50 pound penalty, down from 100.
  • GT1 Request for Five Star Nascar Compliant Bodywork #27756cars addedaddedGT1 adds 5 Star NASCAR Camaro 2018 and later body as allowed bodywork option.
Virginia International Raceway Runoffs 20192019-10-051:43.857Tony Ave · fastest of 12 · top 5 within 3.9s1:48.562Tony Ave · fastest of 11 · top 5 within 11.4s183.2Tony Ave1:57.361Wiley Mcmahan · fastest of 15 · top 5 within 3.8s1:57.572Wiley Mcmahan · fastest of 15 · top 5 within 4.0s142.8Eric McRee+9.010squal +13.504s108.3%qual 113.0%2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago+27.897squal +30.695s125.7%qual 129.6%
11 rule changes (GT1: 6, F5: 1, SM: 4)2 cars added · 1 aero · 1 engine · 1 weight · 3 wording · 3 other · F500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 minimum weights increase to 900 lbs. · GT1 Porsche 944/968 added: 2981cc twin-turbo four, 2585 lbs minimum weight. · GT1 allows Trans Am rear wing, 72" span, 12" chord, 1/2" wicker, 100 sq in endplates, no weight penalty; front undertray allowed with 50 lb penalty. · GTX tube frame cars now allowed fuel injection with maximum 90mm throttle body. · GTX adds Ligier JS2 R classification with restrictor and minimum weight. · GT1 and GT2/3/Lite remove ride height ground clearance rules; cars may now touch ground when tires deflate. · SM fuel pump and filter now permitted as Mazda or OEM equivalent part. · SM allows factory Mazda ECU and injector harnesses (P/N 0000-10-020E-99, 0000-10-080D-99) on 1999–2000 model year cars, unmodified. · SM electrical rules reorganized and clarified; alternator now externally regulated only by OEM ECU or master kill switch; harness repair by splicing permitted. · SM tire tread protrusion language removed from GCR 9.1.7.C.5. · GTX FIA GT3: Audi R8 now 40 mm restrictor and 2900 lbs; BMW Z4 now 70 mm restrictor and 2800 lbs; Ferrari 488 now 35 mm restrictor, TIR, and 3025 lbs.showhide
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbsslower · weightF500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 minimum weights increase to 900 lbs.
  • GT1 Request to classify Porsche 944/968 #26242cars addedaddedGT1 Porsche 944/968 added: 2981cc twin-turbo four, 2585 lbs minimum weight.
  • GT1 Clarify Trans Am Legal Bodywork and Wing #26953aeroadded · aeroGT1 allows Trans Am rear wing, 72" span, 12" chord, 1/2" wicker, 100 sq in endplates, no weight penalty; front undertray allowed with 50 lb penalty.
  • GT1 Request GTX Fuel injection for previous GT-1 tube frame cars #26141engineadded · engineGTX tube frame cars now allowed fuel injection with maximum 90mm throttle body.
  • GT1 Request to Classify Ligier JS2 R #26535cars addedaddedGTX adds Ligier JS2 R classification with restrictor and minimum weight.
  • GT1 Request Ride Height Clarification #26600wordingfasterGT1 and GT2/3/Lite remove ride height ground clearance rules; cars may now touch ground when tires deflate.
  • SM Request to allow aftermarket fuel filters. #26370otheraddedSM fuel pump and filter now permitted as Mazda or OEM equivalent part.
  • SM Request 99-00 replacement Wire harnesses #25602otheraddedSM allows factory Mazda ECU and injector harnesses (P/N 0000-10-020E-99, 0000-10-080D-99) on 1999–2000 model year cars, unmodified.
  • SM Organize and Clarify 9.1.7.C.1.o. #25913wordingwordingSM electrical rules reorganized and clarified; alternator now externally regulated only by OEM ECU or master kill switch; harness repair by splicing permitted.
  • SM Strike Tire Tread Language #26123wordingremovedSM tire tread protrusion language removed from GCR 9.1.7.C.5.
  • GT1 GTX Homologation table update #26034otherunclearGTX FIA GT3: Audi R8 now 40 mm restrictor and 2900 lbs; BMW Z4 now 70 mm restrictor and 2800 lbs; Ferrari 488 now 35 mm restrictor, TIR, and 3025 lbs.
Sonoma Raceway Runoffs 20182018-10-101:35.673Michael Lewis · fastest of 8 · top 5 within 7.1s1:37.516Michael Lewis · fastest of 7 · top 5 within 5.3s111.6Preston Calvert1:41.807Jeff Jorgenson · fastest of 5 · top 5 within 6.6s1:42.491David Lapham · fastest of 5 · top 5 within 9.5s113.3David Lapham+4.975squal +6.134s105.1%qual 106.4%1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn+17.762squal +18.682s118.2%qual 119.5%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:36.008David Pintaric · fastest of 17 · top 5 within 2.2s1:36.187Cliff Ebben · fastest of 16 · top 5 within 1.5s1:43.136Wiley Clinton McMahan · fastest of 38 · top 5 within 1.4s1:42.860Wiley Clinton McMahan · fastest of 37 · top 5 within 1.6s+6.673squal +7.128s106.9%qual 107.4%1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+22.913squal +22.298s123.8%qual 123.2%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:21.927Cliff Ebben · fastest of 8 · top 5 within 2.5s1:22.866Michael Lewis · fastest of 7 · top 5 within 2.1s1:28.528Calvin Stewart · fastest of 14 · top 5 within 3.9s1:29.853Steven Thompson · fastest of 12 · top 5 within 4.5s+6.987squal +6.601s108.4%qual 108.1%1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+17.898squal +18.587s121.6%qual 122.7%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-211:44.244Michael Lewis · fastest of 11 · top 5 within 7.8s1:47.116Michael Lewis · fastest of 7 · top 5 within 8.3s2:01.824W. Clint McMahan · fastest of 16 · top 5 within 3.0s2:03.298Matthew Strand · fastest of 15 · top 5 within 4.9s+16.182squal +17.580s115.1%qual 116.9%2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+36.951squal +34.417s134.5%qual 133.0%

By track

TrackEventsTypical % of GT1BestLatest
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 GT1's best on the same day: the weather, the track and its configuration cancel out, so one figure compares across tracks and years where lap times cannot. 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.