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BoP Lab / Classes / T4

T4 vs SM vs T2 vs FV pace at every track

Lap times across years say as much about the weather as the class. % of T4 is each class's best lap as a share of T4'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-SpecEPFAFCFE2FFFPvsFV×FXGT1GT2GTXHPPP2vsSM×SMXSRF3STLSTUT1vsT2×T3T4×Show 51 inactive classes
Series
Reference · what % is measured against, 12 events
Tracks · untick to narrow

Closest to the field: T4 100.0% of T4 Philip Royle, Daytona International Speedway Runoffs 2015 race · SM 95.6% of T4 Travis Wiley, Virginia International Raceway Runoffs 2022 race · T2 85.8% of T4 Kurt Rezzetano, Virginia International Raceway Runoffs 2022 race · FV 94.9% of T4 Andrew Whitston, Virginia International Raceway Runoffs 2022 race

1:402:002:202:4048 rule changes between Runoffs 2018 and Runoffs 201948 ▾63 rule changes between Runoffs 2019 and Runoffs 202063 ▾51 rule changes between Runoffs 2020 and Runoffs 202151 ▾54 rule changes between Runoffs 2021 and Runoffs 202254 ▾38 rule changes between Runoffs 2022 and Runoffs 202338 ▾65 rule changes between Runoffs 2023 and Runoffs 202465 ▾62 rule changes between Runoffs 2024 and Runoffs 202562 ▾54 rule changes between Runoffs 2025 and Runoffs 202654 ▾T4 race best at Runoffs 2015: 2:15.994 (Philip Royle)T4 race best at Runoffs 2016: 1:40.397 (Oscar Jackson)T4 race best at Runoffs 2017: 1:56.923 (Oscar Jackson)T4 race best at Runoffs 2018: 1:54.030 (John Heinricy)T4 race best at Runoffs 2019: 2:10.959 (Nick Leverone)T4 race best at Runoffs 2020: 2:37.881 (Chi Ho)T4 race best at Runoffs 2021: 1:55.929 (John Heinricy)T4 race best at Runoffs 2022: 2:25.443 (John Heinricy)T4 race best at Runoffs 2023: 2:11.962 (Devin Anderson)T4 race best at Runoffs 2024: 2:34.208 (Alex Lozano)T4 race best at Runoffs 2025: 2:32.633 (Alex Lozano)T4 race best at Runoffs 2026: 2:35.757 (Matt Spicuzzi)T4 qualifying best at Runoffs 2015: 2:15.886 (Philip Royle)T4 qualifying best at Runoffs 2016: 1:38.813 (Jonathan Yanca)T4 qualifying best at Runoffs 2017: 1:56.566 (Oscar Jackson)T4 qualifying best at Runoffs 2018: 1:52.339 (Gresham Wagner)T4 qualifying best at Runoffs 2019: 2:11.257 (John Heinricy)T4 qualifying best at Runoffs 2020: 2:37.403 (John Heinricy)T4 qualifying best at Runoffs 2021: 1:54.397 (Stephen Blethen)T4 qualifying best at Runoffs 2022: 2:09.577 (John Heinricy)T4 qualifying best at Runoffs 2023: 2:10.514 (Devin Anderson)T4 qualifying best at Runoffs 2024: 2:34.430 (Matt Spicuzzi)T4 qualifying best at Runoffs 2025: 2:32.956 (Matt Spicuzzi)T4 qualifying best at Runoffs 2026: 2:35.876 (Matt Spicuzzi)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)T2 race best at Runoffs 2015: 2:01.077 (Kurt Rezzetano)T2 race best at Runoffs 2016: 1:32.691 (John M Buttermore)T2 race best at Runoffs 2017: 1:48.769 (John M Buttermore)T2 race best at Runoffs 2018: 1:45.999 (John Kachadurian)T2 race best at Runoffs 2019: 1:58.551 (Cooper I MacNeil)T2 race best at Runoffs 2020: 2:26.803 (Kurt Rezzetano)T2 race best at Runoffs 2021: 1:48.474 (Kurt Rezzetano)T2 race best at Runoffs 2022: 2:04.756 (Kurt Rezzetano)T2 race best at Runoffs 2023: 2:01.201 (Kurt Rezzetano)T2 race best at Runoffs 2024: 2:23.261 (Kurt Rezzetano)T2 race best at Runoffs 2025: 2:23.483 (Kurt Rezzetano)T2 race best at Runoffs 2026: 2:23.141 (Scotty B White)T2 qualifying best at Runoffs 2015: 2:00.172 (Kurt Rezzetano)T2 qualifying best at Runoffs 2016: 1:31.563 (Preston Calvert)T2 qualifying best at Runoffs 2017: 1:48.618 (John M Buttermore)T2 qualifying best at Runoffs 2018: 1:45.032 (John Kachadurian)T2 qualifying best at Runoffs 2019: 1:57.537 (Cooper I MacNeil)T2 qualifying best at Runoffs 2020: 2:24.195 (Alan Kossof)T2 qualifying best at Runoffs 2021: 1:47.509 (Kurt Rezzetano)T2 qualifying best at Runoffs 2022: 2:00.276 (Kurt Rezzetano)T2 qualifying best at Runoffs 2023: 1:59.504 (Kurt Rezzetano)T2 qualifying best at Runoffs 2024: 2:22.117 (Kurt Rezzetano)T2 qualifying best at Runoffs 2025: 2:23.351 (Kurt Rezzetano)T2 qualifying best at Runoffs 2026: 2:23.977 (Scotty B White)FV race best at Runoffs 2015: 2:21.142 (Andrew Whitston)FV race best at Runoffs 2016: 1:38.066 (Flinn Lazier)FV race best at Runoffs 2017: 1:55.923 (Michael Varacins)FV race best at Runoffs 2018: 1:53.639 (Alex Scaler)FV race best at Runoffs 2019: 2:18.289 (Zachary Whitston)FV race best at Runoffs 2020: 2:45.816 (Alex Scaler)FV race best at Runoffs 2021: 1:57.234 (Alex Scaler)FV race best at Runoffs 2022: 2:18.093 (Andrew Whitston)FV race best at Runoffs 2023: 2:16.611 (Andrew Abbott)FV race best at Runoffs 2024: 2:44.834 (Andrew Abbott)FV race best at Runoffs 2025: 2:46.736 (Zachary Whitston)FV race best at Runoffs 2026: 2:45.272 (Brian Farnham)FV qualifying best at Runoffs 2015: 2:21.167 (Roger Siebenaler)FV qualifying best at Runoffs 2016: 1:37.942 (Alex Scaler)FV qualifying best at Runoffs 2017: 1:55.759 (Michael Varacins)FV qualifying best at Runoffs 2018: 1:52.637 (Skip Streets)FV qualifying best at Runoffs 2019: 2:15.712 (Andrew Whitston)FV qualifying best at Runoffs 2020: 2:43.994 (Hunter Phelps-Barron)FV qualifying best at Runoffs 2021: 1:57.479 (Andrew Whitston)FV qualifying best at Runoffs 2022: 2:15.116 (Brian Farnham)FV qualifying best at Runoffs 2023: 2:15.639 (Andrew Whitston)FV qualifying best at Runoffs 2024: 2:42.643 (Andrew Whitston)FV qualifying best at Runoffs 2025: 2:44.101 (Andrew Abbott)FV qualifying best at Runoffs 2026: 2:46.536 (Zachary Whitston)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
T4SMT2FVsolid race · dashed qualifying · slower is lower
90%95%100%105%48 rule changes between Runoffs 2018 and Runoffs 201948 ▾63 rule changes between Runoffs 2019 and Runoffs 202063 ▾51 rule changes between Runoffs 2020 and Runoffs 202151 ▾54 rule changes between Runoffs 2021 and Runoffs 202254 ▾38 rule changes between Runoffs 2022 and Runoffs 202338 ▾65 rule changes between Runoffs 2023 and Runoffs 202465 ▾62 rule changes between Runoffs 2024 and Runoffs 202562 ▾54 rule changes between Runoffs 2025 and Runoffs 202654 ▾T4 race best at Runoffs 2015: 100.0% of T4's (Philip Royle)T4 race best at Runoffs 2016: 100.0% of T4's (Oscar Jackson)T4 race best at Runoffs 2017: 100.0% of T4's (Oscar Jackson)T4 race best at Runoffs 2018: 100.0% of T4's (John Heinricy)T4 race best at Runoffs 2019: 100.0% of T4's (Nick Leverone)T4 race best at Runoffs 2020: 100.0% of T4's (Chi Ho)T4 race best at Runoffs 2021: 100.0% of T4's (John Heinricy)T4 race best at Runoffs 2022: 100.0% of T4's (John Heinricy)T4 race best at Runoffs 2023: 100.0% of T4's (Devin Anderson)T4 race best at Runoffs 2024: 100.0% of T4's (Alex Lozano)T4 race best at Runoffs 2025: 100.0% of T4's (Alex Lozano)T4 race best at Runoffs 2026: 100.0% of T4's (Matt Spicuzzi)T4 qualifying best at Runoffs 2015: 100.0% of T4's (Philip Royle)T4 qualifying best at Runoffs 2016: 100.0% of T4's (Jonathan Yanca)T4 qualifying best at Runoffs 2017: 100.0% of T4's (Oscar Jackson)T4 qualifying best at Runoffs 2018: 100.0% of T4's (Gresham Wagner)T4 qualifying best at Runoffs 2019: 100.0% of T4's (John Heinricy)T4 qualifying best at Runoffs 2020: 100.0% of T4's (John Heinricy)T4 qualifying best at Runoffs 2021: 100.0% of T4's (Stephen Blethen)T4 qualifying best at Runoffs 2022: 100.0% of T4's (John Heinricy)T4 qualifying best at Runoffs 2023: 100.0% of T4's (Devin Anderson)T4 qualifying best at Runoffs 2024: 100.0% of T4's (Matt Spicuzzi)T4 qualifying best at Runoffs 2025: 100.0% of T4's (Matt Spicuzzi)T4 qualifying best at Runoffs 2026: 100.0% of T4's (Matt Spicuzzi)SM race best at Runoffs 2015: 105.9% of T4's (Todd Lamb)SM race best at Runoffs 2016: 100.4% of T4's (Michael Carter)SM race best at Runoffs 2017: 101.9% of T4's (Michael Gagliardo)SM race best at Runoffs 2018: 101.1% of T4's (Michael Carter)SM race best at Runoffs 2019: 104.2% of T4's (Elivan Goulart)SM race best at Runoffs 2020: 103.7% of T4's (Preston Pardus)SM race best at Runoffs 2021: 102.5% of T4's (Brian Henderson)SM race best at Runoffs 2022: 95.6% of T4's (Travis Wiley)SM race best at Runoffs 2023: 103.2% of T4's (Julian DaCosta)SM race best at Runoffs 2024: 104.7% of T4's (Brett Kowalski)SM race best at Runoffs 2025: 107.7% of T4's (Kyle Greenhill)SM race best at Runoffs 2026: 104.5% of T4's (Francisco Barroso)SM qualifying best at Runoffs 2015: 102.0% of T4's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 101.7% of T4's (Justin Hille)SM qualifying best at Runoffs 2017: 101.5% of T4's (Chris Haldeman)SM qualifying best at Runoffs 2018: 101.8% of T4's (Ken Sutherland)SM qualifying best at Runoffs 2019: 102.5% of T4's (Todd Buras)SM qualifying best at Runoffs 2020: 103.1% of T4's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 102.9% of T4's (Brian Henderson)SM qualifying best at Runoffs 2022: 103.9% of T4's (Danny Steyn)SM qualifying best at Runoffs 2023: 103.4% of T4's (Danny Steyn)SM qualifying best at Runoffs 2024: 104.3% of T4's (Ethan Goulart)SM qualifying best at Runoffs 2025: 106.6% of T4's (Bobby Gossett)SM qualifying best at Runoffs 2026: 104.0% of T4's (Brett Kowalski)T2 race best at Runoffs 2015: 89.0% of T4's (Kurt Rezzetano)T2 race best at Runoffs 2016: 92.3% of T4's (John M Buttermore)T2 race best at Runoffs 2017: 93.0% of T4's (John M Buttermore)T2 race best at Runoffs 2018: 93.0% of T4's (John Kachadurian)T2 race best at Runoffs 2019: 90.5% of T4's (Cooper I MacNeil)T2 race best at Runoffs 2020: 93.0% of T4's (Kurt Rezzetano)T2 race best at Runoffs 2021: 93.6% of T4's (Kurt Rezzetano)Off the chart: T2 race best at Runoffs 2022: 85.8% of T4's (Kurt Rezzetano)T2 race best at Runoffs 2023: 91.8% of T4's (Kurt Rezzetano)T2 race best at Runoffs 2024: 92.9% of T4's (Kurt Rezzetano)T2 race best at Runoffs 2025: 94.0% of T4's (Kurt Rezzetano)T2 race best at Runoffs 2026: 91.9% of T4's (Scotty B White)T2 qualifying best at Runoffs 2015: 88.4% of T4's (Kurt Rezzetano)T2 qualifying best at Runoffs 2016: 92.7% of T4's (Preston Calvert)T2 qualifying best at Runoffs 2017: 93.2% of T4's (John M Buttermore)T2 qualifying best at Runoffs 2018: 93.5% of T4's (John Kachadurian)T2 qualifying best at Runoffs 2019: 89.5% of T4's (Cooper I MacNeil)T2 qualifying best at Runoffs 2020: 91.6% of T4's (Alan Kossof)T2 qualifying best at Runoffs 2021: 94.0% of T4's (Kurt Rezzetano)T2 qualifying best at Runoffs 2022: 92.8% of T4's (Kurt Rezzetano)T2 qualifying best at Runoffs 2023: 91.6% of T4's (Kurt Rezzetano)T2 qualifying best at Runoffs 2024: 92.0% of T4's (Kurt Rezzetano)T2 qualifying best at Runoffs 2025: 93.7% of T4's (Kurt Rezzetano)T2 qualifying best at Runoffs 2026: 92.4% of T4's (Scotty B White)FV race best at Runoffs 2015: 103.8% of T4's (Andrew Whitston)FV race best at Runoffs 2016: 97.7% of T4's (Flinn Lazier)FV race best at Runoffs 2017: 99.1% of T4's (Michael Varacins)FV race best at Runoffs 2018: 99.7% of T4's (Alex Scaler)FV race best at Runoffs 2019: 105.6% of T4's (Zachary Whitston)FV race best at Runoffs 2020: 105.0% of T4's (Alex Scaler)FV race best at Runoffs 2021: 101.1% of T4's (Alex Scaler)FV race best at Runoffs 2022: 94.9% of T4's (Andrew Whitston)FV race best at Runoffs 2023: 103.5% of T4's (Andrew Abbott)FV race best at Runoffs 2024: 106.9% of T4's (Andrew Abbott)Off the chart: FV race best at Runoffs 2025: 109.2% of T4's (Zachary Whitston)FV race best at Runoffs 2026: 106.1% of T4's (Brian Farnham)FV qualifying best at Runoffs 2015: 103.9% of T4's (Roger Siebenaler)FV qualifying best at Runoffs 2016: 99.1% of T4's (Alex Scaler)FV qualifying best at Runoffs 2017: 99.3% of T4's (Michael Varacins)FV qualifying best at Runoffs 2018: 100.3% of T4's (Skip Streets)FV qualifying best at Runoffs 2019: 103.4% of T4's (Andrew Whitston)FV qualifying best at Runoffs 2020: 104.2% of T4's (Hunter Phelps-Barron)FV qualifying best at Runoffs 2021: 102.7% of T4's (Andrew Whitston)FV qualifying best at Runoffs 2022: 104.3% of T4's (Brian Farnham)FV qualifying best at Runoffs 2023: 103.9% of T4's (Andrew Whitston)FV qualifying best at Runoffs 2024: 105.3% of T4's (Andrew Whitston)FV qualifying best at Runoffs 2025: 107.3% of T4's (Andrew Abbott)FV qualifying best at Runoffs 2026: 106.8% of T4's (Zachary Whitston)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
T4SMT2FVsolid race · dashed qualifying · each class's best lap as a share of T4's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventT4SMT2FV
Qual best Race best Trap Qual best Race best Trap vs T4 % of T4 Qual best Race best Trap vs T4 % of T4 Qual best Race best Trap vs T4 % of T4 
Road America Runoffs 20262026-09-282:35.876Matt Spicuzzi · fastest of 12 · top 5 within 2.4s+2.920s (+1.91%)2:35.757Matt Spicuzzi · fastest of 12 · top 5 within 2.7s+3.124s (+2.05%)127.6Matt Spicuzzi-6.0 mph (-4.5%)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%)+6.968squal +6.297s104.5%qual 104.0%2:23.977Scotty B White · fastest of 22 · top 5 within 2.5s+0.626s (+0.44%)2:23.141Scotty B White · fastest of 18 · top 5 within 2.7s-0.342s (-0.24%)147.2Ami Wilson-6.9 mph (-4.5%)-12.616squal -11.899s91.9%qual 92.4%2:46.536Zachary Whitston · fastest of 37 · top 5 within 1.7s+2.435s (+1.48%)2:45.272Brian Farnham · fastest of 34 · top 5 within 1.3s-1.464s (-0.88%)117.4Rick Shields+0.2 mph (+0.1%)+9.515squal +10.660s106.1%qual 106.8%
54 rule changes (T4: 26, SM: 2, T2: 26)13 weight · 9 cars added · 8 suspension & brakes · 6 induction · 3 tyres & wheels · 2 aero · 1 engine · 1 removed · 1 wording · 10 othershowhide
  • T2 TCR Data Points - BoP #40508weight +300 lbs
  • T4 02-06 R53 Mini Cooper Hotchkins Rear Camber Arms #40677suspension & brakes
  • T4 Is it time? #40653cars added
  • T4 Combine T4 BRZ/86/FRS generations #40656weight
  • SM Rear Toe Link #40271other
  • T2 2023 TCR Hyundais #40278cars added
  • T4 Dodge Neon DOHC Weight #40329weight
  • T2 2015+ Ecoboost Mustang #40005weight -100 lbs
  • T2 C6 Corvette - All Body Trims Requested #40174aero
  • T2 T2-TCR Table Mazda 3 #40209tyres & wheels
  • T4 SPB In T4 #39973other
  • T4 02-06 Mini Cooper S #40106weight -50 lbs
  • T4 02-06 Mini Cooper S Fuel #40107other
  • T4 Shock error #40176suspension & brakes
  • T4 Max Tire Sizes #40183tyres & wheels
  • T4 2003 Honda Civic Si Classification #39999cars added
  • SM Part Number Change Request #39914wording
  • T2 14-17 BMW 435i Brake Approval Request #39910suspension & brakes
  • T2 Porsche Cayman S Spec Lines Needed for Atlanta HST #39947engine
  • T2 Please address loopholes in T2 TCR #40002weight
  • T4 16-24 ND MX5 T4 #39934suspension & brakes
  • T2 BMW 240i Permitted Tune #39861other
  • T4 ND MX-5 Spec Line Rewrite Request #39802weight -100 lbs
  • T4 4.0 Mustang spec line cleanup #39831induction
  • T2 Request to Add 2014-2017 435i to T2 #38991cars added
  • T2 Consideration for Nissan Z & NISMO Z to Touring 2 Class #39296cars added
  • T2 Allow Alt Bushing Material in Toe Links #39607suspension & brakes
  • T2 Request for Classification of MG6 TCR in T2-TCR Class #39702cars added
  • T4 T4 and T3 Feedback #39230removed
  • T4 T4 Mustang 4.0 #39489induction
  • T4 Allow Alt Bushing Material in Toe Links #39607suspension & brakes
  • T2 Alternate Placement of Fuse Panel and Electronics Request #39370other
  • T2 Rebalance Blackwing Cadillac T2 for 2026 #39426weight -50 lbs
  • T2 C6 LS2 Corvette Parity Request #39472induction
  • T2 T2 Tire Sizing #39490weight -25 lbs
  • T2 Rear Spoiler for Mustang GT S550 (15-23) #39499aero
  • T2 Clarify T4 Brake Rotor Allowance #39503suspension & brakes
  • T4 Alternate Placement of Fuse Panel and Electronics Request #39370other
  • T4 Clarify T4 Brake Rotor Allowance #39503suspension & brakes
  • T2 Help the 2011-2014 s197Mustang GT and Boss302 Less Restriction #38523induction
  • T2 Improving Competitiveness of Gen 5 Camaro SS #39021weight -50 lbs
  • T2 Adjust T2 Darkhorse R #39346weight
  • T4 Classing 1995-99 Dodge Neon SOHC #39285cars added
  • T2 ND Gearset Request for T4 #39166other
  • T2 ND Spec Lines Wrong PT#'s #39170weight
  • T2 Touring 2 Post-Runoffs BOP Adjustments and Changes #39274induction -50 lbs
  • T2 Adjust rev limit on Spec Corvette in T2 #39282other
  • T4 02-06 Mini Cooper Gear Ratios #38966other
  • T4 Reinstatement of the 2005-2010 Cobalt into T4 #38987cars added
  • T4 Request to Classify Mercedes C230K #39080cars added
  • T4 ND Gearset Request for T4 #39166other
  • T4 E&O wheel size on ND #39168tyres & wheels
  • T4 ND Spec Lines Wrong PT#'s #39170weight
  • T4 Touring 4 Post-Runoffs BOP Adjustments and Changes #39251induction -100 lbs
Road America Runoffs 20252025-09-292:32.956Matt Spicuzzi · fastest of 10 · top 5 within 3.8s-1.474s (-0.95%)2:32.633Alex Lozano · fastest of 10 · top 5 within 4.3s-1.575s (-1.02%)133.7Alex Lozano+4.4 mph (+3.4%)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%)+11.797squal +10.155s107.7%qual 106.6%2:23.351Kurt Rezzetano · fastest of 11 · top 5 within 3.1s+1.234s (+0.87%)2:23.483Kurt Rezzetano · fastest of 10 · top 5 within 2.9s+0.222s (+0.15%)154.1John Heinricy+4.8 mph (+3.2%)-9.150squal -9.605s94.0%qual 93.7%2:44.101Andrew Abbott · fastest of 34 · top 5 within 1.3s+1.458s (+0.90%)2:46.736Zachary Whitston · fastest of 29 · top 5 within 0.6s+1.902s (+1.15%)117.2Zachary Whitston+0.7 mph (+0.6%)+14.103squal +11.145s109.2%qual 107.3%
62 rule changes (T4: 29, SM: 4, T2: 29)10 tyres & wheels · 10 weight · 9 cars added · 7 induction · 5 suspension & brakes · 4 engine · 2 removed · 1 aero · 4 wording · 10 othershowhide
  • T2 Incorrect Touring Heading #38451wording
  • T2 Clarifications needed to BMW M2 CS cup line #38536tyres & wheels
  • T2 Fix brake allowance supersessions. #38554suspension & brakes
  • T2 C5 Corvette correction #38782induction
  • T4 Incorrect Touring Heading #38451wording
  • T4 Allow B-Spec cars to run in T4 #38439other
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • T4 T4 Mustang #38059weight -100 lbs
  • T4 SSC tire allowance #38216tyres & wheels
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • T2 C6 T-2 Corvette 6 Liter Engine Restrictor #37490induction
  • T2 370Z Mid link Replacement for True Coil Overs and OEM Wheel Size #38014tyres & wheels
  • T2 T2 Cadillac tire #38210tyres & wheels
  • T4 Correct Ring and Pinion Ratio to T3, Sorry I Mean T4 3.7 V6 Stang #38041wording
  • T4 T4 Mustang #38058aero
  • T2 Please class the Darkhorse R in T2 #37295cars added
  • T2 T2 350Z Spec Line Cleanup #37603weight
  • T2 T2 BOP #37312induction
  • T2 Mustang Update backdate #37275removed
  • T2 BOP Adjustment for 2016 - Camaro SS/1LE #37434weight +100 lbs
  • T2 BMW M235iR TCS CHANGE REQUEST #37470other
  • T2 Request to Classify Club Spec in Appropriate Touring Classes #37523cars added
  • T4 Ford Mustang V6 (05-14) #37516other
  • T4 Request to Classify Club Spec in Appropriate Touring Classes #37523cars added
  • T2 Remove spec lines that have expired #37269induction
  • T2 BoP for the Various Mustangs #37185weight -50 lbs
  • T2 Spec Corvette Line Clarification. #37441weight
  • T4 Remove spec lines that have expired #37269induction
  • T4 2016-2018 Mazda Miata MX5 #37085weight -75 lbs
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • T2 Redundant Verbiage Regarding Mustang Spec Lines for Driveshaft #36484suspension & brakes
  • T2 Request Less Restriction for Ls-3 Engined C6 Corvette #36810induction
  • T2 Fuel Emissions Components #37076engine
  • T2 fix brake wording #37129suspension & brakes
  • T2 Evaporative emissions systems #37130engine
  • T2 Move Spec Boxster to T4 #37158cars added
  • T2 Corvette Wheels #37169tyres & wheels
  • T2 BMW 320i Spec Line #37204other
  • T2 Classification for a 2005 Cadillac CTS 3.6 liter 6 speed manual #37224cars added
  • T2 Please Consider Allowing Update to the C5 Corvette #37298induction
  • T2 Major error in lane, but nobody ran it. #37302removed
  • T4 Redundant Verbiage Regarding Mustang Spec Lines for Driveshaft #36484suspension & brakes
  • T4 R53 Mini Cooper S Weight Reduction Request #36612weight
  • T4 Allowable Wheel Offset #36855tyres & wheels
  • T4 Fuel Emissions Components #37076engine
  • T4 2019-2024 Mazda 3 for T4 #37077cars added
  • T4 fix brake wording #37129suspension & brakes
  • T4 Evaporative emissions systems #37130engine
  • T4 Allow Spec MX5 upgrade kit for 2009-11 RX8 S2 Transmision #37140other
  • T4 Move Spec Boxster to T4 #37158cars added
  • T4 3.7 Mustangs to T4 #37188cars added
  • T4 BMW 320i Spec Line #37204other
  • T4 MX5 2006-2015 NC Help #37221other
  • T4 Classification for a 2005 Cadillac CTS 3.6 liter 6 speed manual #37224cars added
  • T4 Civic SI in T4 #37248weight -50 lbs
  • T4 2006-2015 T4 NC Mx5 spec line #37278weight
  • T4 ND MX-5 wheel allowance #37279tyres & wheels
  • T4 T4 BOP #37281weight +75 lbs
  • T4 Allow 7.5 #37286tyres & wheels
  • T2 Spec Corvette Change for T2 #37127tyres & wheels
  • T4 Bop Request 06-11 Honda Civic Si #37013other
Road America Runoffs 20242024-10-012:34.430Matt Spicuzzi · fastest of 15 · top 5 within 1.8s-2.973s (-1.89%)2:34.208Alex Lozano · fastest of 14 · top 5 within 2.2s-3.673s (-2.33%)129.3Alex Lozano-0.9 mph (-0.7%)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%)+7.278squal +6.676s104.7%qual 104.3%2:22.117Kurt Rezzetano · fastest of 8 · top 5 within 2.7s-2.078s (-1.44%)2:23.261Kurt Rezzetano · fastest of 7 · top 5 within 3.0s-3.542s (-2.41%)149.3Scotty B White+2.0 mph (+1.3%)-10.947squal -12.313s92.9%qual 92.0%2:42.643Andrew Whitston · fastest of 27 · top 5 within 2.3s-1.351s (-0.82%)2:44.834Andrew Abbott · fastest of 27 · top 5 within 0.9s-0.982s (-0.59%)116.5Brian Farnham-0.7 mph (-0.6%)+10.626squal +8.213s106.9%qual 105.3%
65 rule changes (T4: 28, SM: 4, T2: 31, FV: 2)18 weight · 14 suspension & brakes · 6 induction · 4 tyres & wheels · 3 cars added · 3 engine · 2 aero · 1 removed · 2 wording · 12 othershowhide
  • FV Disc Brakes #36822suspension & brakes
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • T2 Errors #36214induction -75 lbs
  • T2 Subaru Appeal #36258other
  • T2 S550 Brakes #36571suspension & brakes
  • T4 T4 Camaro V6 weight reduction #36232weight
  • T4 BOP adjustment for ND MX5s #36345weight -50 lbs
  • T2 Mustang T2/T3 #35877other
  • T2 S550 Brakes #35926suspension & brakes
  • T2 T2-T4 Driveshaft Mistake...? #36050weight
  • T2 request for allowance of 6 piston calipers for T2 C5 corvettes #36126other
  • T2 B8/8.5 Audi S4 T3 and T2 #36195cars added
  • T4 Mustang T2/T3 #35877other
  • T4 Homologation of car to T4 #36030cars added
  • T4 T2-T4 Driveshaft Mistake...? #36050weight
  • T4 MINI Cooper S Spec Lines Corrections. #36086removed
  • T4 Allow Removal of Sound Tubes #36130induction
  • T4 B8/8.5 Audi S4 T3 and T2 #36195cars added
  • T4 Allow OEM Front Spoiler 06-08 Miata in T4 #35941aero
  • T4 T4 Mustang Weight Reduction In T4 Spec #36051weight -50 lbs
  • T4 R53 Mini Cooper S spec line request In #36056suspension & brakes
  • T2 Allow T4 and T3 RX8 to Disable/Remove Factory Oil Inj. #35761engine
  • T2 Competition Adjustment Request/Wheel Size of E46 #35895tyres & wheels
  • T2 Driveshafts #35916weight
  • T4 Allow T4 and T3 RX8 to Disable/Remove Factory Oil Inj. #35761engine
  • T4 2023 ND2 Miata Classification and Allowances #35837weight
  • T4 Errors and Omissions for 06-09 VW Rabbit Rotor #35851suspension & brakes
  • T4 Driveshafts #35916weight
  • T4 GCR ERROR - letter not properly applied to GCR #35999weight
  • T2 Brake Request for 2009 Porsche Cayman #35723suspension & brakes
  • T4 Corrections to T4 RX8 Spec line #35767aero
  • T2 Reorganize Spec Lines #35375induction
  • T2 370Z Brake Rotor Size Correction #35487suspension & brakes
  • T2 Letter #35154 2018+ Mustang GT Expansion #35488suspension & brakes
  • T4 Reorganize Spec Lines #35375induction
  • T4 Allow any 400lb rear spring in the RX8 #35433suspension & brakes
  • T4 370Z Brake Rotor Size Correction #35487suspension & brakes
  • T2 2015+ Mustang Sway Bar and A-Arm Request #35154suspension & brakes
  • T2 Brake Kits #35245suspension & brakes
  • T2 Runoffs wording on Caddy in T2 #35377wording
  • T2 More Car Lightening Stuff #35319weight
  • T2 Inclusion of B-C spec cars in T4 #35374other
  • T2 T2-T4 Set expiration dates on spec lines #35378induction
  • T2 Reply to letter #35161 and #31661 #35384weight +75 lbs
  • T4 More Car Lightening Stuff #35319weight
  • T4 ND Missed Items #35352other
  • T4 Inclusion of B-C spec cars in T4 #35374other
  • T4 T2-T4 Set expiration dates on spec lines #35378induction
  • T2 Rebalance Blackwing Cadillac T2 #35079tyres & wheels
  • T2 M2 CS RACING #35130weight -50 lbs
  • T2 Spec Corvette in T2 #35139weight -175 lbs
  • T2 T2 Viper BoP #35155tyres & wheels
  • T2 BOP Adjustment for 5.0L Mustangs #35156weight +75 lbs
  • T2 Take at Look at T-2 BOP #35161weight -50 lbs
  • T2 C5 Corvette Spec Line Oversight #35169weight
  • T2 Requested Update of Model Years of 370Z #35231other
  • T4 Mazda MX-5 ND1 Spec Line Request #34232weight +50 lbs
  • T4 BRZ/FRS/86 Spring Allowance #35038suspension & brakes
  • T4 TSX Allowance #35219other
  • T4 Requested Update of Model Years of 370Z #35231other
  • FV FV Wheel Bearing Clarification #35150tyres & wheels
  • T2 M2 CS RACING #35122other
Virginia International Raceway Runoffs 20232023-09-232:10.514Devin Anderson · fastest of 24 · top 5 within 0.5s+0.937s (+0.72%)2:11.962Devin Anderson · fastest of 23 · top 5 within 0.1s-13.481s (-9.27%)127.8Raymond Blethen+0.5 mph (+0.4%)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%)+4.267squal +4.472s103.2%qual 103.4%1:59.504Kurt Rezzetano · fastest of 13 · top 5 within 2.1s-0.772s (-0.64%)2:01.201Kurt Rezzetano · fastest of 13 · top 5 within 1.6s-3.555s (-2.85%)150.7Scotty B White-1.9 mph (-1.2%)-10.761squal -11.010s91.8%qual 91.6%2:15.639Andrew Whitston · fastest of 27 · top 5 within 1.4s+0.523s (+0.39%)2:16.611Andrew Abbott · fastest of 23 · top 5 within 1.6s-1.482s (-1.07%)115.6Brian Farnham-0.2 mph (-0.2%)+4.649squal +5.125s103.5%qual 103.9%
38 rule changes (T4: 20, SM: 1, T2: 17)11 weight · 8 suspension & brakes · 3 tyres & wheels · 2 cars added · 2 induction · 1 engine · 3 wording · 8 othershowhide
  • T4 Inclusion of similar car. (CLK 320) #34626other
  • T2 Corvette LS2 Restrictor Plate Adjustment #34456induction
  • T2 Blacking Cadillac Fuel Capacity #34624engine
  • T2 Rules Clarification for Mazda RX8 Spec Line #34395weight
  • T2 rule book corrections #34437wording
  • T2 Ride Height Correction for the T3 Solstice. #34615suspension & brakes
  • T4 Rules Clarification for Mazda RX8 Spec Line #34395weight
  • T4 rule book corrections #34437wording
  • T4 Ride Height Correction for the T3 Solstice. #34615suspension & brakes
  • T2 370Z Obsolete Parts & NISMO Alternatives to SPL Parts #34297weight
  • T4 2002-2006 Mini Cooper S R53 Spec Line Request #34336weight -50 lbs
  • T2 2009 Porsche Cayman Classing Request #34147other
  • T4 05-06 Mini Wheel Weight #34112weight
  • T4 06-09 VW Rabbit #34153induction
  • T4 96-01 Audi a4 2.8 Spring Rate #34217suspension & brakes
  • T2 C5 Z06 Straight Line Speed #33575weight
  • T2 Allowance of any nonmetallic bushing material in T2 #33833suspension & brakes
  • T2 Allow Adjustable stabilizer bar links #33861suspension & brakes
  • T4 Request to Classify 2004-2008 Acura TSX in T4 #33590cars added
  • T4 T4 Mustang Brakes/Swaybar #34036suspension & brakes
  • T2 Honda Civic Type R Tire Size Increase #33672tyres & wheels
  • T4 BMW 320I intercooler #33762other
  • T2 C5 Corvette Swaybars #33269other
  • T2 Mustang OEM Grill Request #33333other
  • T4 2019-2021 Mazda MX5 ND2 #32027cars added
  • T4 Mustang OEM Grill Request #33333other
  • T4 Mazda OEM LSD was letter 32655 typo #33666wording
  • SM BOP for NB1 and NB2 #32309weight
  • T2 BMW M235iR/M240iR Aftermarket 2WNR Shocks Allowed - Touring 2 #33464suspension & brakes -50 lbs
  • T2 Touring (T2-T5) Category #33617tyres & wheels
  • T2 ENO 9.1.9.2.D.1.e.1.a. #33651other
  • T4 Allowable Springs and Sway Bars for 06-11 Civic si Spec Line #33294suspension & brakes
  • T4 Touring (T2-T5) Category #33617tyres & wheels
  • T4 ENO 9.1.9.2.D.1.e.1.a. #33651other
  • T2 Heavy Cars #33345weight +125 lbs
  • T4 T4 mustang #32789weight -25 lbs
  • T4 Mazda OEM LSD was letter 32655 #32933weight -25 lbs
  • T4 Another 2022 BRZ/86 T3 request #32945weight +225 lbs
Virginia International Raceway Runoffs 20222022-09-242:09.577John Heinricy · fastest of 18 · top 5 within 0.7s-1.680s (-1.28%)2:25.443John Heinricy · fastest of 18 · top 5 within 2.5s+14.484s (+11.06%)127.4Nick Leverone-1.5 mph (-1.2%)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%)-6.336squal +5.087s95.6%qual 103.9%2:00.276Kurt Rezzetano · fastest of 14 · top 5 within 1.7s+2.739s (+2.33%)2:04.756Kurt Rezzetano · fastest of 14 · top 5 within 2.0s+6.205s (+5.23%)152.5Aaron Kaplan+3.2 mph (+2.1%)-20.687squal -9.301s85.8%qual 92.8%2:15.116Brian Farnham · fastest of 29 · top 5 within 1.1s-0.596s (-0.44%)2:18.093Andrew Whitston · fastest of 28 · top 5 within 1.2s-0.196s (-0.14%)115.8Jonathan Weisheit+1.1 mph (+0.9%)-7.350squal +5.539s94.9%qual 104.3%
54 rule changes (T4: 29, SM: 1, T2: 20, FV: 4)14 suspension & brakes · 11 weight · 7 cars added · 6 tyres & wheels · 3 engine · 2 induction · 1 removed · 3 wording · 7 othershowhide
  • T4 04-09 Mazda3 Balance Shaft Delete Kit #32795other
  • T2 BMW M235iR/M240iR Min Weight Clarification #32430weight
  • T2 Follow up to Letter 30888 #32477other
  • T4 Request Wider Wheels for Hyundai Tiburon #32536tyres & wheels
  • T2 Request Alternate Front & Rear Strut/Shock Top Hats #32452suspension & brakes
  • T2 Request BoP E92 torque #32456other
  • T2 Classify Cadillac Blackwing #32535cars added
  • T4 Request to Add Spec Line for 2004-2009 Mazda3 i 2.0 #32395weight
  • T4 Request Alternate Front & Rear Strut/Shock Top Hats #32452suspension & brakes
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • T2 Request to Allow the Use of Aftermarket ECU's in Touring #31067engine
  • T2 BMW M2 CS Cup 2020- Exhaust #32243tyres & wheels
  • T2 RequestT2 classification- 2022 Cadillac CT4-V Blackwing #32263cars added
  • T4 Request to Allow the Use of Aftermarket ECU's in Touring #31067engine
  • T4 Request JWT BSR Kit for 02-06 Nissan Sentra SE-R/Spec V #31685other
  • T4 Please Confirm Touring 4 (98-00) BMW 323 is E46 generation #31972other
  • T4 RX-8 Spring Part Numbers (E&O) #32151suspension & brakes
  • T4 04-09 Mazda3 Tire Limit Clarification #32249tyres & wheels
  • T4 Shock Part Number Errors & Omissions #32252suspension & brakes
  • T4 Update Solo Spec Coupe to latest '20 specs for Road Racing #32262other
  • T4 Request 2016 Mazda MX5 springs #32265suspension & brakes
  • FV Connecting Rod Update Request for 9.1.1.C Formula Vee (FV) 5.C.6 #32160weight
  • FV E&O clarification of connecting rod center-to-center length #32183weight
  • T2 Reply to letter #31486/29879 T2-T4 Grill openings #31935suspension & brakes
  • T2 C6 Restrictor Help #31995induction
  • T4 Reply to letter #31486/29879 T2-T4 Grill openings #31935suspension & brakes
  • T4 BRZ vs BRZ TS #32022tyres & wheels
  • T2 BMW Z4M Adjustment #31885weight -50 lbs
  • T4 MX-5 Durability Detailed #31102weight
  • T4 Request Allowances for 2005 - 2010 Mustang #31624wording
  • FV Update direct replacement connecting rod information #31843weight
  • T2 Touring 2 BOP adjustments for 2022 #31480weight -50 lbs
  • T2 Reply to letter 29879 T2-T4 Grill Openings #31486suspension & brakes
  • T2 Request to clarify radiator hoses #31682wording
  • T2 Clarify Permitted/Allowed #31743suspension & brakes
  • T2 SMG #31837other
  • T4 Reply to letter 29879 T2-T4 Grill Openings #31486suspension & brakes
  • T4 Please Adjust 98-00 BMW 323 Min Weight to Reflect Current Class #31595weight -200 lbs
  • T4 Consolidate 12-13 and 14-15 Honda Civic Si spec lines for T4 #31596removed
  • T4 Request to clarify radiator hoses #31682wording
  • T4 Clarify Permitted/Allowed #31743suspension & brakes
  • T4 Correct RSX wording #31746tyres & wheels
  • T4 Camaro #31751suspension & brakes
  • FV Formula V Connecting Rod Replacement #31448weight
  • T2 Typo for BMW M2 CS Cup 2020 #31173suspension & brakes
  • T4 Nissan Sentra SE-R Spec. V #30958cars added
  • T4 Mazda RX-8 Spec Line Suspension Parts #31113induction
  • T4 Diverter Valve Plunger Upgrade #31307engine
  • T4 Adjust Honda FWD in T4 to encourage more Drivetrain Diversity #31472tyres & wheels
  • T4 Touring 4 BOP adjustments for 2022 #31482weight -175 lbs
  • T2 Request to Classify 2014 VW Jetta 1.8t TSI #30436cars added
  • T2 Request new car 2017 BMW M2 #30486cars added
  • T2 Request to Classify Porsche 997.2 GTS in T2 (body not = to C2S) #30686cars added
  • T4 Request to Classify 2014 VW Jetta 1.8t TSI #30436cars added
Indianapolis Motor Speedway Runoffs 20212021-09-251:54.397Stephen Blethen · fastest of 47 · top 5 within 0.9s-2.169s (-1.86%)1:55.929John Heinricy · fastest of 46 · top 5 within 1.0s-0.994s (-0.85%)127.3Alexander Schefer1:57.695Brian 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+2.908squal +3.298s102.5%qual 102.9%1:47.509Kurt Rezzetano · fastest of 26 · top 5 within 1.6s-1.109s (-1.02%)1:48.474Kurt Rezzetano · fastest of 26 · top 5 within 2.5s-0.295s (-0.27%)151.5Scotty B. White-7.455squal -6.888s93.6%qual 94.0%1:57.479Andrew Whitston · fastest of 48 · top 5 within 0.8s+1.720s (+1.49%)1:57.234Alex Scaler · fastest of 47 · top 5 within 1.0s+1.311s (+1.13%)124.0Mark Edwards+1.305squal +3.082s101.1%qual 102.7%
51 rule changes (T4: 20, SM: 1, T2: 30)11 weight · 5 cars added · 5 suspension & brakes · 5 tyres & wheels · 3 induction · 3 wording · 19 othershowhide
  • T2 BMW M2 CS Power Stick Part Number #31087wording
  • T2 997.1 EO #30933other
  • T2 Request #30406weight
  • T4 Wrong Part Number on 320i Spec Line #30645wording
  • T2 Civic Type R Brake Rotors #29817suspension & brakes
  • T2 Mustang S550 Parity in T2 #29925other
  • T2 Request BOP on BMW Z4 T2 car #30597weight +50 lbs
  • T2 E92 #30639weight -50 lbs
  • T4 Civic Type R Brake Rotors #29817suspension & brakes
  • T2 C5/6 Corvette in T1, T1-LP and T2 Dry Sump Standardization #29046other
  • T2 Request for Chevrolet Camaro 1LE (2016-) Auto Trans #29067other
  • T2 Request E46 M3 Minimum Competition Weight #29429weight -100 lbs
  • T2 Request to add 2015 to Chevrolet Camaro SS/1LE 2010-2014 #29736other
  • T4 Mini Cooper Spec Line Anomalies #30478weight
  • T4 Request CAI Mustang in T4 #30562induction
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • T2 Request consistency review in GCR #30263other
  • T2 Class Spec Corvette in T2? #30297cars added
  • T2 E92 BMW Spring Rate Request #30391suspension & brakes
  • T2 Please correct recent T2 Spec Line #30401suspension & brakes
  • T4 Request consistency review in GCR #30263other
  • T2 Request BMW M2CS door glass removal #30254other
  • T4 E & O T4 Mustang Wheels #30245tyres & wheels
  • T2 Request Addition of BMW M240iR #29503weight
  • T2 2021 Toyota Supra #29567cars added
  • T2 Request Cold Air Intake for Honda Civic Type R #29942induction
  • T2 Adjust T2 spec line that was missed in T2 BOP #30055weight -50 lbs
  • T2 Fix T2 Mustang spec line #30106other
  • T2 Z4 Wheel Size #30113tyres & wheels
  • T2 Clarify T2 Spec lines #30194tyres & wheels
  • T4 2021 Toyota Supra #29567cars added
  • T4 06-15 MX-5 Durability #29781other
  • T4 Request for Update to T4 Spec Line for Chevrolet Sonic (2011-) #29838induction
  • T4 NC MX-5 06-15 Part Number updates for 2021 #29921weight
  • T4 BMW Z4 2.5L (03-05) Spec Line #30037weight -50 lbs
  • T4 Sway Bars for T4 2016+ MX5 Mazda #30063suspension & brakes
  • T4 Change part numbers on BRZ, FRS lines in T4 #30104wording
  • T4 T4 Mustang Axle Ratio and Wheels #30149tyres & wheels
  • T2 Request to Classify BMW M2 CS #29523cars added
  • T2 350Z Rear Caliper Replacement #29710other
  • T2 Request Mustang 8.8” rear axle replacement #29860other
  • T2 Cap year range on all 86s #29908other
  • T4 Request to Classify BMW M2 CS #29523cars added
  • T4 Allow the SpecMX-5 Update Kit Into Touring 4 for the MX-5 #29681other
  • T4 Request Mustang 8.8” rear axle replacement #29860other
  • T4 Cap year range on all 86s #29908other
  • T2 Request to Reevaluate T2 Spec Line for E92 M3 #28266weight -50 lbs
  • T2 Request for Parity Among Vehicles Including S550 Mustang #29486weight -75 lbs
  • T2 Alfa Romeo 4C Launch Edition #29531other
  • T4 Alfa Romeo 4C Launch Edition #29531other
  • T4 Post Runoffs Feedback for T4 #29752tyres & wheels -50 lbs
Road America Runoffs 20202020-10-022:37.403John Heinricy · fastest of 20 · top 5 within 2.5s2:37.881Chi Ho · fastest of 19 · top 5 within 1.6s130.2Chi Ho2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill+5.867squal +4.806s103.7%qual 103.1%2:24.195Alan Kossof · fastest of 15 · top 5 within 2.5s2:26.803Kurt Rezzetano · fastest of 14 · top 5 within 2.2s147.3Mark Boden-11.078squal -13.208s93.0%qual 91.6%2:43.994Hunter Phelps-Barron · fastest of 28 · top 5 within 0.6s2:45.816Alex Scaler · fastest of 24 · top 5 within 1.5s117.1Hunter Phelps-Barron+7.935squal +6.591s105.0%qual 104.2%
63 rule changes (T4: 25, SM: 2, T2: 30, FV: 6)12 suspension & brakes · 12 weight · 9 tyres & wheels · 5 cars added · 3 engine · 2 aero · 2 induction · 9 wording · 9 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • T2 Request 2018+ mustang swaybar update #28659suspension & brakes
  • T2 Request to Clarify New 2-piece Brake Rotor Rule #29106suspension & brakes
  • T2 please consider BoP for the following cars in T2 #29266weight -50 lbs
  • T2 Request clarification on most recent approval by the Board #29284suspension & brakes
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • T2 Request to correct GCR for 2018+ FORD Mustang GT & Ecoboost #28803wording
  • T4 Scion FRS Solo Spec Coupe Gear Ratio #29021other
  • FV Support for Recommended Item - 4 bolt wheels in FV #29084tyres & wheels
  • FV Support for 4-bolt pattern wheels #28955 #29118tyres & wheels
  • T2 Request to Add a Vehicle to the Roster (contd.) #27698other
  • T2 Request brake upgrade and electric power steering pump #28946suspension & brakes
  • T4 T4 RX8 bodywork clarification #28941aero
  • T4 2006-2015 MX-5 Clarification #28942tyres & wheels
  • T4 Request to Add a Vehicle to the Roster (contd.) #27698other
  • T2 Request to Classify 2004 Mercedes Benz 320 CLK #27663cars added
  • T2 Consider coil spring conversion Corvette in T2 #28824suspension & brakes
  • T4 Request to Classify 2004 Mercedes Benz 320 CLK #27663cars added
  • T2 Please Add the Following BBK to Allowed List for E92 M3 #28421wording
  • T2 C5 Weight Adjustment #28433weight -50 lbs
  • T2 Z3M Roadster Weight #28437weight
  • T4 Request to change allowed header part # for T4 06-15 Miata #28223wording
  • T4 Z3M Roadster Weight #28437weight
  • T2 Limit Changes to the 997.2 Porsche #28242aero
  • T2 Correct T2 Mustang Transmission #28732wording
  • FV Update rain tire designation #28444tyres & wheels
  • T2 Request to Readjust the T2 Porsches #27746induction
  • T4 Request for 12-13 and 14-15 Honda Civic Springs #27848suspension & brakes
  • T4 Request to Clarify T4 05-10 Mustang Spring Allowance #27899suspension & brakes
  • T2 Please Switch the Solstice GXP as Specified in T2, to T3 #27413weight -50 lbs
  • T2 Request for Two Piece Stop Tech Brake Rotors #27582suspension & brakes
  • T2 Request to Classify all Mazda RX8 Models in T3/T4 #27606cars added
  • T2 Request for Alternative Brake Kit on Nissan 370Z #27912suspension & brakes
  • T2 2015- Current Ecoboost Mustang #27971weight -100 lbs
  • T2 T2 Mustang #28022tyres & wheels
  • T4 Request to Allow Brake Upgrade on T4 Mustang #27329suspension & brakes
  • T4 Please Switch the Solstice GXP as Specified in T2, to T3 #27413weight -50 lbs
  • T4 Request to Classify all Mazda RX8 Models in T3/T4 #27606cars added
  • T4 Request for 2014-2018 Mazda 3 GT Brakes #27659suspension & brakes
  • T4 Request to allow aftermarket OEM coolant expansion tank #27763engine
  • T4 Request to allow aftermarket OEM power steering reservoir #27764wording
  • T4 Request for Factory Installed Wings on Subaru BRZ #27831other
  • T4 Request for Replacement Clutches #27892other
  • T4 Request to Classify Chevy Sonic 1.4 In T4 #27906cars added
  • T4 Weight Change Request for 1999 Mazda Miata #28129weight -50 lbs
  • FV FV Allow non-spec tire in Regional competition #26284tyres & wheels
  • FV Request to Allow Rear Tires on the Front of Formula Vee #26537tyres & wheels
  • T2 Clarification of On-Board Fire System for T2 #27183wording
  • T2 Mustang Ecoboost and GT Transmission #27439other
  • T2 Request for Dailey Engineering Dry Sump on 2010 Camaro SS #27514engine
  • T2 Request for Half Shafts - 2014 Camaro SS 1LE #27584induction
  • T2 Request for Parity Among Vehicles #27665weight -50 lbs
  • T2 Request for 2016-2020 Camaro SS Help #27776weight -50 lbs
  • T2 Request for Competitive Adjustments to Honda Civic Type R #27839weight -50 lbs
  • T2 T4 RX8 Classification Error #27902wording
  • T2 Request to add Toyota 86 GT to Spec Line #27910other
  • T4 Clarification of On-Board Fire System for T2 #27183wording
  • T4 Mustang Ecoboost and GT Transmission #27439other
  • T4 BRZ/FRS/86 Tire Size in T4 #27660tyres & wheels
  • T4 NC MX5 2006-2015 Spec Adjustment Request #27739weight -75 lbs
  • T4 T4 RX8 Classification Error #27902wording
  • T4 Request to add Toyota 86 GT to Spec Line #27910other
  • FV Clarification on Wheel Bolt Pattern #27603tyres & wheels
Virginia International Raceway Runoffs 20192019-10-052:11.257John Heinricy · fastest of 25 · top 5 within 0.2s2:10.959Nick Leverone · fastest of 25 · top 5 within 0.6s128.9Tommy Boileau2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago+5.500squal +3.295s104.2%qual 102.5%1:57.537Cooper I MacNeil · fastest of 19 · top 5 within 3.4s1:58.551Cooper I MacNeil · fastest of 18 · top 5 within 2.4s149.4James Leithauser-12.408squal -13.720s90.5%qual 89.5%2:15.712Andrew Whitston · fastest of 26 · top 5 within 1.5s2:18.289Zachary Whitston · fastest of 19 · top 5 within 0.4s114.8Roger Siebenaler+7.330squal +4.455s105.6%qual 103.4%
48 rule changes (T4: 15, SM: 4, T2: 23, FV: 6)11 suspension & brakes · 10 weight · 7 cars added · 5 tyres & wheels · 3 induction · 2 engine · 4 wording · 6 othershowhide
  • FV Allowed Modifications E&O #27398other
  • FV E&O Wheels #27230tyres & wheels
  • T2 Request spare tire/wheel clarification #27012tyres & wheels
  • T4 Request spare tire/wheel clarification #27012tyres & wheels
  • T4 Research E&O Mazda MX5 #27112weight
  • T2 Request to change Cadillac CTS-V years from 06-07 to 04-07 #26842cars added
  • T2 Request to allow Hotchkiss front / rear sway bars on T2 CTS-V #26845suspension & brakes
  • T2 Consider T2 06-07 Cadillac CTS-V BoP #27022induction
  • T2 Correct T2 Mustang tire size #27024tyres & wheels
  • T4 MR2 Spyder Year Correction #26936wording
  • FV Exhaust termination rule E&O #26702other
  • T2 2018+ Audi TT RS Suspension Allowances #26631suspension & brakes
  • T2 Request BOP adjustment for 2018 Honda Civic Type R-TIR removal #26882weight +150 lbs
  • T4 Request to allow piggy back ECU on 2000 Mazda Protégé #26085engine
  • T4 Request helper spring as optional #26678suspension & brakes
  • FV E&O Dimensions #26674other
  • FV Request to clarify Disc Brake rules bearing retainer & weights #26262suspension & brakes
  • T2 Request for Removal of Rear Anti-roll Bar in T2 Mustang GT #26533suspension & brakes
  • T4 Request to classify 2000 - 2001 BMW 323 #25096cars added
  • SM Request to allow aftermarket fuel filters. #26370wording
  • T2 Request Mustang GT Limited Prep 2018 Classification #24431cars added
  • T2 Request to Classify 2018 Audi TT RS #25961cars added
  • T2 Request for Adjustments on 2017+ Civic Type R #25969suspension & brakes
  • T2 Correct Mazda MX-5 Hard Top Notes #26137weight
  • T2 Consider opening class rules to allow any thermostat #26187wording
  • T2 Ford Mustang Boss 302 (12-13) - correct weight #26287weight -50 lbs
  • T2 Request camber correction 005-2013 corvette C6 #26288suspension & brakes
  • T2 Request 98-02 Firebird 98-02 Camaro reloacte rear spring #26291suspension & brakes
  • T2 Cap 2016 Mazda Miata year at 2018 #26388other
  • T2 Class Ford Mustang GT 2018+ (reference letter 24431) #26400cars added
  • T4 Correct Mazda MX-5 Hard Top Notes #26137weight
  • T4 Consider opening class rules to allow any thermostat #26187wording
  • T4 Cap 2016 Mazda Miata year at 2018 #26388other
  • FV FV Intake Manifold Clarification #26008induction
  • 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
  • T4 2012-2015 Honda Civic Si Performance Request #26129suspension & brakes
  • T2 Errors, Omissions, and Updates (Various) #22414weight
  • T2 Request to classify 2015 Cayman GTS 3.4L in T2 #25335cars added
  • T2 Request for 2017-2018 Honda Civic Type R - 4 BOP Grill #25513other
  • T2 Add Clarification to Spec Car Classifications Vehicle Spec #25774weight
  • T2 Clarify Subframe Bushings Permitted for T2-T4 #25800suspension & brakes
  • T4 Errors, Omissions, and Updates (Various) #22414weight
  • T4 Request for Adjustments to fiat 124 specline #25371induction
  • T4 Add Clarification to Spec Car Classifications Vehicle Spec #25774weight
  • T4 Clarify Subframe Bushings Permitted for T2-T4 #25800suspension & brakes
  • T4 Consider Solo SSC cross over classification into T4 #25802cars added
Sonoma Raceway Runoffs 20182018-10-101:52.339Gresham Wagner · fastest of 12 · top 5 within 1.1s1:54.030John Heinricy · fastest of 12 · top 5 within 0.2s106.0Ross Murray1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn+1.248squal +2.016s101.1%qual 101.8%1:45.032John Kachadurian · fastest of 30 · top 5 within 2.4s1:45.999John Kachadurian · fastest of 28 · top 5 within 3.0s106.5John Kachadurian-8.031squal -7.307s93.0%qual 93.5%1:52.637Skip Streets · fastest of 29 · top 5 within 1.6s1:53.639Alex Scaler · fastest of 28 · top 5 within 0.4s106.3Skip Streets-0.391squal +0.298s99.7%qual 100.3%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:56.566Oscar Jackson · fastest of 40 · top 5 within 0.6s1:56.923Oscar Jackson · fastest of 38 · top 5 within 1.1s1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+2.177squal +1.740s101.9%qual 101.5%1:48.618John M Buttermore · fastest of 26 · top 5 within 0.8s1:48.769John M Buttermore · fastest of 25 · top 5 within 1.2s-8.154squal -7.948s93.0%qual 93.2%1:55.759Michael Varacins · fastest of 39 · top 5 within 1.0s1:55.923Michael Varacins · fastest of 32 · top 5 within 1.3s-1.000squal -0.807s99.1%qual 99.3%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:38.813Jonathan Yanca · fastest of 34 · top 5 within 2.0s1:40.397Oscar Jackson · fastest of 32 · top 5 within 0.8s1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+0.367squal +1.701s100.4%qual 101.7%1:31.563Preston Calvert · fastest of 22 · top 5 within 0.5s1:32.691John M Buttermore · fastest of 20 · top 5 within 1.5s-7.706squal -7.250s92.3%qual 92.7%1:37.942Alex Scaler · fastest of 41 · top 5 within 0.3s1:38.066Flinn Lazier · fastest of 38 · top 5 within 0.7s-2.331squal -0.871s97.7%qual 99.1%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:15.886Philip Royle · fastest of 22 · top 5 within 0.9s2:15.994Philip Royle · fastest of 20 · top 5 within 1.6s2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+8.073squal +2.775s105.9%qual 102.0%2:00.172Kurt Rezzetano · fastest of 20 · top 5 within 3.2s2:01.077Kurt Rezzetano · fastest of 19 · top 5 within 2.8s-14.917squal -15.714s89.0%qual 88.4%2:21.167Roger Siebenaler · fastest of 31 · top 5 within 0.8s2:21.142Andrew Whitston · fastest of 30 · top 5 within 1.1s+5.148squal +5.281s103.8%qual 103.9%

By track

TrackEvents Typical % of T4 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 T4'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.