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BoP Lab / Classes / STU

STU vs AS vs SM vs SRF3 pace at every track

Lap times across years say as much about the weather as the class. % of STU is each class's best lap as a share of STU's on the same day, so the conditions drop out: 100% is level, less is quicker, and a move in it is the class getting faster or slower against the field.

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
vsAS×B-SpecEPFAFCFE2FFFPFVFXGT1GT2GTXHPPP2vsSM×SMXvsSRF3×STLSTU×T1T2T3T4Show 51 inactive classes
Series
Reference · what % is measured against, 12 events
Tracks · untick to narrow

Closest to the field: STU 100.0% of STU Eric Heinrich, Daytona International Speedway Runoffs 2015 race · AS 81.8% of STU Gregory Eaton, Virginia International Raceway Runoffs 2022 race · SM 91.3% of STU Travis Wiley, Virginia International Raceway Runoffs 2022 race · SRF3 93.2% of STU Franklin Futrelle, Virginia International Raceway Runoffs 2022 race

1:402:002:202:4033 rule changes between Runoffs 2018 and Runoffs 201933 ▾42 rule changes between Runoffs 2019 and Runoffs 202042 ▾33 rule changes between Runoffs 2020 and Runoffs 202133 ▾34 rule changes between Runoffs 2021 and Runoffs 202234 ▾12 rule changes between Runoffs 2022 and Runoffs 202312 ▾29 rule changes between Runoffs 2023 and Runoffs 202429 ▾36 rule changes between Runoffs 2024 and Runoffs 202536 ▾32 rule changes between Runoffs 2025 and Runoffs 202632 ▾STU race best at Runoffs 2015: 2:06.756 (Eric Heinrich)STU race best at Runoffs 2016: 1:34.597 (Cameron Maugeri)STU race best at Runoffs 2017: 1:49.387 (Rob Huffmaster)STU race best at Runoffs 2018: 1:46.514 (Kevin Boehm)STU race best at Runoffs 2019: 2:00.483 (Kevin Boehm)STU race best at Runoffs 2020: 2:28.410 (Anthony Geraci)STU race best at Runoffs 2021: 1:47.441 (Joe Moser)STU race best at Runoffs 2022: 2:32.357 (Mark Liller)STU race best at Runoffs 2023: 2:02.302 (Mark Liller)STU race best at Runoffs 2024: 2:25.824 (Thomas Noble)STU race best at Runoffs 2025: 2:24.497 (Chip Herr)STU race best at Runoffs 2026: 2:26.416 (Richard Astacio)STU qualifying best at Runoffs 2015: 2:05.494 (Eric Heinrich)STU qualifying best at Runoffs 2016: 1:32.738 (Joe Moser)STU qualifying best at Runoffs 2017: 1:48.921 (Rob Huffmaster)Off the chart: STU qualifying best at Runoffs 2018: 1:19.234 (Franklin Church)STU qualifying best at Runoffs 2019: 1:59.948 (Kevin Boehm)STU qualifying best at Runoffs 2020: 2:27.883 (David Fiorelli)STU qualifying best at Runoffs 2021: 1:47.078 (Joe Moser)STU qualifying best at Runoffs 2022: 2:00.615 (Johan Schwartz)STU qualifying best at Runoffs 2023: 2:00.389 (Johan Schwartz)STU qualifying best at Runoffs 2024: 2:26.227 (Thomas Noble)STU qualifying best at Runoffs 2025: 2:23.083 (Peter Cunningham)STU qualifying best at Runoffs 2026: 2:24.912 (Richard Astacio)AS race best at Runoffs 2015: 2:02.922 (Andy McDermid)AS race best at Runoffs 2016: 1:33.424 (Edward Hosni)AS race best at Runoffs 2017: 1:51.507 (Bryan Long)AS race best at Runoffs 2018: 1:50.345 (John Heinricy)AS race best at Runoffs 2019: 2:03.900 (James Jost)AS race best at Runoffs 2020: 2:27.668 (Gregory Eaton)AS race best at Runoffs 2021: 1:50.606 (Gregory Eaton)AS race best at Runoffs 2022: 2:04.578 (Gregory Eaton)AS race best at Runoffs 2023: 2:04.120 (Gregory Eaton)AS race best at Runoffs 2024: 2:26.429 (Gregory Eaton)AS race best at Runoffs 2025: 2:29.232 (Gregory Eaton)AS race best at Runoffs 2026: 2:28.471 (Andrew McDermid)AS qualifying best at Runoffs 2015: 2:01.746 (Tom Sloe)AS qualifying best at Runoffs 2016: 1:30.651 (Tom Sloe)AS qualifying best at Runoffs 2017: 1:45.220 (James Jost)AS qualifying best at Runoffs 2018: 1:47.782 (Andrew McDermid)AS qualifying best at Runoffs 2019: 2:02.938 (Gregory Eaton)AS qualifying best at Runoffs 2020: 2:27.045 (Gregory Eaton)AS qualifying best at Runoffs 2021: 1:50.427 (Drew Cattell)AS qualifying best at Runoffs 2022: 2:02.162 (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 2:03.082 (Daniel Richardson)AS qualifying best at Runoffs 2024: 2:26.578 (Gregory Eaton)AS qualifying best at Runoffs 2025: 2:26.792 (Andrew McDermid)AS qualifying best at Runoffs 2026: 2:26.911 (Andrew McDermid)SM race best at Runoffs 2015: 2:24.067 (Todd Lamb)SM race best at Runoffs 2016: 1:40.764 (Michael Carter)SM race best at Runoffs 2017: 1:59.100 (Michael Gagliardo)SM race best at Runoffs 2018: 1:55.278 (Michael Carter)SM race best at Runoffs 2019: 2:16.459 (Elivan Goulart)SM race best at Runoffs 2020: 2:43.748 (Preston Pardus)SM race best at Runoffs 2021: 1:58.837 (Brian Henderson)SM race best at Runoffs 2022: 2:19.107 (Travis Wiley)SM race best at Runoffs 2023: 2:16.229 (Julian DaCosta)SM race best at Runoffs 2024: 2:41.486 (Brett Kowalski)SM race best at Runoffs 2025: 2:44.430 (Kyle Greenhill)SM race best at Runoffs 2026: 2:42.725 (Francisco Barroso)SM qualifying best at Runoffs 2015: 2:18.661 (Andrew Carbonell)SM qualifying best at Runoffs 2016: 1:40.514 (Justin Hille)SM qualifying best at Runoffs 2017: 1:58.306 (Chris Haldeman)SM qualifying best at Runoffs 2018: 1:54.355 (Ken Sutherland)SM qualifying best at Runoffs 2019: 2:14.552 (Todd Buras)SM qualifying best at Runoffs 2020: 2:42.209 (Kyle Greenhill)SM qualifying best at Runoffs 2021: 1:57.695 (Brian Henderson)SM qualifying best at Runoffs 2022: 2:14.664 (Danny Steyn)SM qualifying best at Runoffs 2023: 2:14.986 (Danny Steyn)SM qualifying best at Runoffs 2024: 2:41.106 (Ethan Goulart)SM qualifying best at Runoffs 2025: 2:43.111 (Bobby Gossett)SM qualifying best at Runoffs 2026: 2:42.173 (Brett Kowalski)SRF3 race best at Runoffs 2015: 2:10.215 (Chad Galloway)SRF3 race best at Runoffs 2016: 1:34.947 (Cliff White)SRF3 race best at Runoffs 2017: 1:49.782 (Tray Ayres)SRF3 race best at Runoffs 2018: 1:47.053 (TJ Acker)SRF3 race best at Runoffs 2019: 2:04.755 (Bobby Sak)SRF3 race best at Runoffs 2020: 2:31.038 (Justin Hille)SRF3 race best at Runoffs 2021: 1:50.095 (John Black)SRF3 race best at Runoffs 2022: 2:22.066 (Franklin Futrelle)SRF3 race best at Runoffs 2023: 2:04.911 (David Ogburn)SRF3 race best at Runoffs 2024: 2:28.129 (S Sandy Satullo III)SRF3 race best at Runoffs 2025: 2:29.839 (Morgan Burkhard)SRF3 race best at Runoffs 2026: 2:29.257 (Peyton Long)SRF3 qualifying best at Runoffs 2015: 2:08.557 (Kerry Jacobsen)SRF3 qualifying best at Runoffs 2016: 1:34.363 (John Black)SRF3 qualifying best at Runoffs 2017: 1:49.824 (John Black)SRF3 qualifying best at Runoffs 2018: 1:46.117 (Robeson Clay Russell)SRF3 qualifying best at Runoffs 2019: 2:04.624 (Brian Schofield)SRF3 qualifying best at Runoffs 2020: 2:29.786 (TJ Acker)SRF3 qualifying best at Runoffs 2021: 1:49.520 (Franklin Futrelle)SRF3 qualifying best at Runoffs 2022: 2:03.716 (Franklin Futrelle)SRF3 qualifying best at Runoffs 2023: 2:03.842 (Morgan Burkhard)SRF3 qualifying best at Runoffs 2024: 2:27.773 (Denny Stripling)SRF3 qualifying best at Runoffs 2025: 2:28.226 (Bobby Sak)SRF3 qualifying best at Runoffs 2026: 2:27.443 (Tyler Stephens)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
STUASSMSRF3solid race · dashed qualifying · slower is lower
95%100%105%110%115%33 rule changes between Runoffs 2018 and Runoffs 201933 ▾42 rule changes between Runoffs 2019 and Runoffs 202042 ▾33 rule changes between Runoffs 2020 and Runoffs 202133 ▾34 rule changes between Runoffs 2021 and Runoffs 202234 ▾12 rule changes between Runoffs 2022 and Runoffs 202312 ▾29 rule changes between Runoffs 2023 and Runoffs 202429 ▾36 rule changes between Runoffs 2024 and Runoffs 202536 ▾32 rule changes between Runoffs 2025 and Runoffs 202632 ▾STU race best at Runoffs 2015: 100.0% of STU's (Eric Heinrich)STU race best at Runoffs 2016: 100.0% of STU's (Cameron Maugeri)STU race best at Runoffs 2017: 100.0% of STU's (Rob Huffmaster)STU race best at Runoffs 2018: 100.0% of STU's (Kevin Boehm)STU race best at Runoffs 2019: 100.0% of STU's (Kevin Boehm)STU race best at Runoffs 2020: 100.0% of STU's (Anthony Geraci)STU race best at Runoffs 2021: 100.0% of STU's (Joe Moser)STU race best at Runoffs 2022: 100.0% of STU's (Mark Liller)STU race best at Runoffs 2023: 100.0% of STU's (Mark Liller)STU race best at Runoffs 2024: 100.0% of STU's (Thomas Noble)STU race best at Runoffs 2025: 100.0% of STU's (Chip Herr)STU race best at Runoffs 2026: 100.0% of STU's (Richard Astacio)STU qualifying best at Runoffs 2015: 100.0% of STU's (Eric Heinrich)STU qualifying best at Runoffs 2016: 100.0% of STU's (Joe Moser)STU qualifying best at Runoffs 2017: 100.0% of STU's (Rob Huffmaster)STU qualifying best at Runoffs 2018: 100.0% of STU's (Franklin Church)STU qualifying best at Runoffs 2019: 100.0% of STU's (Kevin Boehm)STU qualifying best at Runoffs 2020: 100.0% of STU's (David Fiorelli)STU qualifying best at Runoffs 2021: 100.0% of STU's (Joe Moser)STU qualifying best at Runoffs 2022: 100.0% of STU's (Johan Schwartz)STU qualifying best at Runoffs 2023: 100.0% of STU's (Johan Schwartz)STU qualifying best at Runoffs 2024: 100.0% of STU's (Thomas Noble)STU qualifying best at Runoffs 2025: 100.0% of STU's (Peter Cunningham)STU qualifying best at Runoffs 2026: 100.0% of STU's (Richard Astacio)AS race best at Runoffs 2015: 97.0% of STU's (Andy McDermid)AS race best at Runoffs 2016: 98.8% of STU's (Edward Hosni)AS race best at Runoffs 2017: 101.9% of STU's (Bryan Long)AS race best at Runoffs 2018: 103.6% of STU's (John Heinricy)AS race best at Runoffs 2019: 102.8% of STU's (James Jost)AS race best at Runoffs 2020: 99.5% of STU's (Gregory Eaton)AS race best at Runoffs 2021: 102.9% of STU's (Gregory Eaton)Off the chart: AS race best at Runoffs 2022: 81.8% of STU's (Gregory Eaton)AS race best at Runoffs 2023: 101.5% of STU's (Gregory Eaton)AS race best at Runoffs 2024: 100.4% of STU's (Gregory Eaton)AS race best at Runoffs 2025: 103.3% of STU's (Gregory Eaton)AS race best at Runoffs 2026: 101.4% of STU's (Andrew McDermid)AS qualifying best at Runoffs 2015: 97.0% of STU's (Tom Sloe)AS qualifying best at Runoffs 2016: 97.7% of STU's (Tom Sloe)AS qualifying best at Runoffs 2017: 96.6% of STU's (James Jost)Off the chart: AS qualifying best at Runoffs 2018: 136.0% of STU's (Andrew McDermid)AS qualifying best at Runoffs 2019: 102.5% of STU's (Gregory Eaton)AS qualifying best at Runoffs 2020: 99.4% of STU's (Gregory Eaton)AS qualifying best at Runoffs 2021: 103.1% of STU's (Drew Cattell)AS qualifying best at Runoffs 2022: 101.3% of STU's (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 102.2% of STU's (Daniel Richardson)AS qualifying best at Runoffs 2024: 100.2% of STU's (Gregory Eaton)AS qualifying best at Runoffs 2025: 102.6% of STU's (Andrew McDermid)AS qualifying best at Runoffs 2026: 101.4% of STU's (Andrew McDermid)SM race best at Runoffs 2015: 113.7% of STU's (Todd Lamb)SM race best at Runoffs 2016: 106.5% of STU's (Michael Carter)SM race best at Runoffs 2017: 108.9% of STU's (Michael Gagliardo)SM race best at Runoffs 2018: 108.2% of STU's (Michael Carter)SM race best at Runoffs 2019: 113.3% of STU's (Elivan Goulart)SM race best at Runoffs 2020: 110.3% of STU's (Preston Pardus)SM race best at Runoffs 2021: 110.6% of STU's (Brian Henderson)Off the chart: SM race best at Runoffs 2022: 91.3% of STU's (Travis Wiley)SM race best at Runoffs 2023: 111.4% of STU's (Julian DaCosta)SM race best at Runoffs 2024: 110.7% of STU's (Brett Kowalski)SM race best at Runoffs 2025: 113.8% of STU's (Kyle Greenhill)SM race best at Runoffs 2026: 111.1% of STU's (Francisco Barroso)SM qualifying best at Runoffs 2015: 110.5% of STU's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 108.4% of STU's (Justin Hille)SM qualifying best at Runoffs 2017: 108.6% of STU's (Chris Haldeman)Off the chart: SM qualifying best at Runoffs 2018: 144.3% of STU's (Ken Sutherland)SM qualifying best at Runoffs 2019: 112.2% of STU's (Todd Buras)SM qualifying best at Runoffs 2020: 109.7% of STU's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 109.9% of STU's (Brian Henderson)SM qualifying best at Runoffs 2022: 111.6% of STU's (Danny Steyn)SM qualifying best at Runoffs 2023: 112.1% of STU's (Danny Steyn)SM qualifying best at Runoffs 2024: 110.2% of STU's (Ethan Goulart)SM qualifying best at Runoffs 2025: 114.0% of STU's (Bobby Gossett)SM qualifying best at Runoffs 2026: 111.9% of STU's (Brett Kowalski)SRF3 race best at Runoffs 2015: 102.7% of STU's (Chad Galloway)SRF3 race best at Runoffs 2016: 100.4% of STU's (Cliff White)SRF3 race best at Runoffs 2017: 100.4% of STU's (Tray Ayres)SRF3 race best at Runoffs 2018: 100.5% of STU's (TJ Acker)SRF3 race best at Runoffs 2019: 103.5% of STU's (Bobby Sak)SRF3 race best at Runoffs 2020: 101.8% of STU's (Justin Hille)SRF3 race best at Runoffs 2021: 102.5% of STU's (John Black)Off the chart: SRF3 race best at Runoffs 2022: 93.2% of STU's (Franklin Futrelle)SRF3 race best at Runoffs 2023: 102.1% of STU's (David Ogburn)SRF3 race best at Runoffs 2024: 101.6% of STU's (S Sandy Satullo III)SRF3 race best at Runoffs 2025: 103.7% of STU's (Morgan Burkhard)SRF3 race best at Runoffs 2026: 101.9% of STU's (Peyton Long)SRF3 qualifying best at Runoffs 2015: 102.4% of STU's (Kerry Jacobsen)SRF3 qualifying best at Runoffs 2016: 101.8% of STU's (John Black)SRF3 qualifying best at Runoffs 2017: 100.8% of STU's (John Black)Off the chart: SRF3 qualifying best at Runoffs 2018: 133.9% of STU's (Robeson Clay Russell)SRF3 qualifying best at Runoffs 2019: 103.9% of STU's (Brian Schofield)SRF3 qualifying best at Runoffs 2020: 101.3% of STU's (TJ Acker)SRF3 qualifying best at Runoffs 2021: 102.3% of STU's (Franklin Futrelle)SRF3 qualifying best at Runoffs 2022: 102.6% of STU's (Franklin Futrelle)SRF3 qualifying best at Runoffs 2023: 102.9% of STU's (Morgan Burkhard)SRF3 qualifying best at Runoffs 2024: 101.1% of STU's (Denny Stripling)SRF3 qualifying best at Runoffs 2025: 103.6% of STU's (Bobby Sak)SRF3 qualifying best at Runoffs 2026: 101.7% of STU's (Tyler Stephens)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
STUASSMSRF3solid race · dashed qualifying · each class's best lap as a share of STU's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSTUASSMSRF3
Qual best Race best Trap Qual best Race best Trap vs STU % of STU Qual best Race best Trap vs STU % of STU Qual best Race best Trap vs STU % of STU 
Road America Runoffs 20262026-09-282:24.912Richard Astacio · fastest of 17 · top 5 within 2.6s+1.829s (+1.28%)2:26.416Richard Astacio · fastest of 16 · top 5 within 1.5s+1.919s (+1.33%)145.1Hugh Stewart+0.8 mph (+0.5%)2:26.911Andrew McDermid · fastest of 8 · top 5 within 3.4s+0.119s (+0.08%)2:28.471Andrew McDermid · fastest of 8 · top 5 within 2.4s-0.761s (-0.51%)151.0Andrew McDermid-0.6 mph (-0.4%)+2.055squal +1.999s101.4%qual 101.4%2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%)2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%)119.6Wyatt Couch+0.3 mph (+0.3%)+16.309squal +17.261s111.1%qual 111.9%2:27.443Tyler Stephens · fastest of 44 · top 5 within 0.3s-0.783s (-0.53%)2:29.257Peyton Long · fastest of 42 · top 5 within 0.3s-0.582s (-0.39%)134.1Bobby Sak+0.4 mph (+0.3%)+2.841squal +2.531s101.9%qual 101.7%
32 rule changes (STU: 15, AS: 13, SM: 2, SRF3: 2)12 weight · 5 induction · 5 tyres & wheels · 4 engine · 1 removed · 1 wording · 4 othershowhide
  • AS 2016+ Camaro Spec Line Full Prep #39646tyres & wheels
  • AS Consideration of Pirelli P Zero Trofeo Track for AS Competition #40495tyres & wheels
  • STU Wheel and tire requirements for GT3U #40679tyres & wheels
  • AS Change in 9.1.6.D.4.d.5 in Suspension Mounting Points #40094other
  • AS Re-Add 4.6L 4v 96-04 Mustang Cobra #40239weight
  • AS Errors and Omissions #40532weight
  • SM Rear Toe Link #40271other
  • STU 9” Wheels #40433tyres & wheels
  • STU Weight adjustment to former GT3U cars #40474weight
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • STU Request to allow BMW M50B20TU engine in STU #40202engine
  • STU Calculating Weight #40224weight
  • STU Turbo Restrictor Size Increase Request #40008induction
  • STU GT86 Cups Car in STU #40028weight
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • SM Part Number Change Request #39914wording
  • STU Mazda Rx-8 Renesis - Streetported Variant & Added Weight #39785weight
  • STU Eliminate 33 and 34 mm TIRs #39872weight
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • SRF3 SRF3 Spark Plugs #39899other
  • STU Fab 9 Racing Intake Manifold in STU #39767induction
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • STU Request for Permission on Aftermarket Turbo Kit and Intake #39529induction
  • AS 1994 Mustang Spec Line Request #39104engine
  • STU Turbo Inlet Restrictor Table #38961induction
  • STU 275 Tire Rule #38983tyres & wheels
  • STU STU Honda Engine weight penalty #39375weight
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
  • STU Non-Homologated Engine Swaps - Specifically K24A2 w/ Honda CRZ #38746weight
  • SRF3 Add HD Oil Cooler #38979other
Road America Runoffs 20252025-09-292:23.083Peter Cunningham · fastest of 16 · top 5 within 2.6s-3.144s (-2.15%)2:24.497Chip Herr · fastest of 15 · top 5 within 3.8s-1.327s (-0.91%)144.3Chip Herr-1.0 mph (-0.7%)2:26.792Andrew McDermid · fastest of 11 · top 5 within 3.9s+0.214s (+0.15%)2:29.232Gregory Eaton · fastest of 10 · top 5 within 4.0s+2.803s (+1.91%)151.5Andrew McDermid+1.9 mph (+1.3%)+4.735squal +3.709s103.3%qual 102.6%2:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%)2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%)119.3Francisco Barroso-0.6 mph (-0.5%)+19.933squal +20.028s113.8%qual 114.0%2:28.226Bobby Sak · fastest of 43 · top 5 within 0.6s+0.453s (+0.31%)2:29.839Morgan Burkhard · fastest of 42 · top 5 within 0.3s+1.710s (+1.15%)133.7Bobby Sak-1.5 mph (-1.1%)+5.342squal +5.143s103.7%qual 103.6%
36 rule changes (STU: 18, AS: 11, SM: 4, SRF3: 3)11 weight · 8 engine · 4 tyres & wheels · 3 induction · 1 cars added · 2 wording · 7 othershowhide
  • SRF3 SRF Rule Updates #38853weight
  • STU Lotus Weight Reduction E&O #38919weight
  • STU STU-TCR Adjustments #38723weight
  • STU Lotus Weight Reduction #38772weight -50 lbs
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • STU 2.8-3.2L N/A Engine Allowances #38007engine
  • STU 2006-2015 Mazda Miata Intake Manifold #38422induction
  • STU Requesting Approval of the JDM Honda h23a #38489cars added
  • AS Errors and Omissions #38234engine
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • AS Errors and Omission #38055induction
  • AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO #38197engine
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • STU Wheel Size Inconsistency #38018tyres & wheels
  • STU Table C: STU-GT3U Clarification #38268weight
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • SRF3 Driver Safety & Comfort #37966other
  • SRF3 Update SADEV transmission specs #37992other
  • AS Race memo #37902engine
  • STU BMW N54/N55 Engine Allowance Follow Up #37447engine
  • STU STU Mini Cooper pulley size clarification re: letter #36980 #37717wording
  • STU Question About a Weight Modifier #37782weight
  • STU Increase Minimum Weight #37919weight +100 lbs
  • AS Increase Coyote Engine Restrictor to 80mm #36177induction
  • AS Performance Pack for 2015+ Mustang #36867weight
  • AS Gear Ratios #37131engine
  • AS ECU specs for LS engine #37208engine
  • STU Audi 1.8t Wagon STU Table B #36685weight
  • STU Merger GT3 to STU #37486other
  • STU GT3 TCR Tire allowance #37494tyres & wheels
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • STU Request to Remove Miata Hubs from General category #37138tyres & wheels
  • STU BMW N54/N55 Engine Allowance #37146engine
  • STU R53 15% Pulley Request #36980other
Road America Runoffs 20242024-10-012:26.227Thomas Noble · fastest of 18 · top 5 within 2.3s-1.656s (-1.12%)2:25.824Thomas Noble · fastest of 17 · top 5 within 2.4s-2.586s (-1.74%)145.3Thomas Noble+1.1 mph (+0.8%)2:26.578Gregory Eaton · fastest of 18 · top 5 within 2.6s-0.467s (-0.32%)2:26.429Gregory Eaton · fastest of 18 · top 5 within 2.5s-1.239s (-0.84%)149.6Gregory Eaton+0.4 mph (+0.3%)+0.605squal +0.351s100.4%qual 100.2%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%)+15.662squal +14.879s110.7%qual 110.2%2:27.773Denny Stripling · fastest of 57 · top 5 within 0.3s-2.013s (-1.34%)2:28.129S Sandy Satullo III · fastest of 52 · top 5 within 0.7s-2.909s (-1.93%)135.2Denny Stripling+3.4 mph (+2.6%)+2.305squal +1.546s101.6%qual 101.1%
29 rule changes (STU: 4, AS: 11, SM: 4, SRF3: 10)6 cars added · 4 suspension & brakes · 4 tyres & wheels · 3 weight · 2 engine · 1 induction · 1 wording · 8 othershowhide
  • SRF3 Update SRF3 Air Filter Rule #36681other
  • SRF3 Update SRF Brake Rotor Thickness #36687suspension & brakes
  • SRF3 Hoosier Tire Decal Placement #36739tyres & wheels
  • AS Mustang transmission ratios #36662engine
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • SRF3 Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels
  • SRF3 Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels
  • STU RWD Turbo Disadvantage #36255induction
  • AS Request for Classification of 2018-2023 mustang In #35764cars added
  • SRF3 SRF3 Alternator Pulley Update In #36095weight
  • AS 6th gen Camaro limited prep #35733cars added
  • AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK #35825cars added
  • AS Full Prep Head #35891other
  • AS Restricted Prep Aftermarket Parts Request #35682other
  • AS Allowance of 11 #35824tyres & wheels
  • AS Request to Classify 1970-1981 Camaro and Firebird in AS #33659cars added
  • AS Fuel Cell 12 #34194other
  • AS Please Classify the 6th Gen Into AS. #35448cars added
  • AS spec lines #35713cars added
  • STU Letter #35397 addendum #35453weight
  • STU S54 Drysump #35464other
  • STU ST Electric-Assisted Steering Systems #35066other
  • SRF3 Update SRF Rain / Brake Rule #34706suspension & brakes
  • SRF3 Update SRF Brake Light Rule v1 #34853suspension & brakes
  • SRF3 SRF / SRF3 Rule Updates #35268weight
  • SRF3 SRF Radiator Rule Update #34805other
Virginia International Raceway Runoffs 20232023-09-232:00.389Johan Schwartz · fastest of 13 · top 5 within 2.3s-0.226s (-0.19%)2:02.302Mark Liller · fastest of 14 · top 5 within 1.6s-30.055s (-19.73%)144.0Mark Liller+0.1 mph (+0.1%)2:03.082Daniel Richardson · fastest of 11 · top 5 within 2.2s+0.920s (+0.75%)2:04.120Gregory Eaton · fastest of 9 · top 5 within 3.0s-0.458s (-0.37%)154.6James Jost+3.7 mph (+2.5%)+1.818squal +2.693s101.5%qual 102.2%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%)+13.927squal +14.597s111.4%qual 112.1%2:03.842Morgan Burkhard · fastest of 40 · top 5 within 0.2s+0.126s (+0.10%)2:04.911David Ogburn · fastest of 39 · top 5 within 0.3s-17.155s (-12.08%)134.5Bobby Sak+0.1 mph (+0.0%)+2.609squal +3.453s102.1%qual 102.9%
12 rule changes (STU: 3, AS: 4, SM: 1, SRF3: 4)4 tyres & wheels · 2 engine · 2 suspension & brakes · 2 weight · 1 cars added · 1 inductionshowhide
  • AS Crate Motor Part Numbers #32944engine
  • AS Request wheel size change #33007tyres & wheels
  • AS Alternative Upper Front Control Arms for Dodge Challenger #33352engine
  • AS Front Brake Caliper Adapters for Dodge Challenger #33353suspension & brakes
  • STU 2022 Toyota GR Cup for STU #34449cars added
  • SRF3 Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • SRF3 Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • STU Alternate OEM Miata Intake Manifold #33827induction
  • SRF3 Update SRF Brake Rule #33469suspension & brakes
  • SRF3 Update SRF Bodywork Fitment Rule #33765tyres & wheels
  • STU E&O STU NA Weight Chart. #33737weight
  • SM BOP for NB1 and NB2 #32309weight
Virginia International Raceway Runoffs 20222022-09-242:00.615Johan Schwartz · fastest of 21 · top 5 within 2.6s+0.667s (+0.56%)2:32.357Mark Liller · fastest of 19 · top 5 within 4.3s+31.874s (+26.46%)143.9Johan Schwartz+0.1 mph (+0.1%)2:02.162Kurt Rezzetano · fastest of 13 · top 5 within 2.3s-0.776s (-0.63%)2:04.578Gregory Eaton · fastest of 11 · top 5 within 2.9s+0.678s (+0.55%)150.9James Jost-3.0 mph (-2.0%)-27.779squal +1.547s81.8%qual 101.3%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%)-13.250squal +14.049s91.3%qual 111.6%2:03.716Franklin Futrelle · fastest of 44 · top 5 within 0.6s-0.908s (-0.73%)2:22.066Franklin Futrelle · fastest of 40 · top 5 within 1.2s+17.311s (+13.88%)134.5David Ogburn+2.1 mph (+1.6%)-10.291squal +3.101s93.2%qual 102.6%
34 rule changes (STU: 21, AS: 9, SM: 1, SRF3: 3)11 weight · 5 engine · 3 suspension & brakes · 2 cars added · 2 induction · 2 tyres & wheels · 1 aero · 2 wording · 6 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • STU Request Mazda 13 B turbo #32668induction
  • STU Hood Vents and Intercooler Scoops #32733other
  • STU Non 4 valve weight reduction removed #32808weight
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • STU Error in new minimum weight table when combined with other text #32711weight
  • STU Redundant Language in May GCR #32713engine
  • SRF3 SRF Tire Rule Update #32614tyres & wheels
  • SRF3 Brake, seal, and air filter clarifications #32670suspension & brakes
  • STU Opposed to the Proposed STU Weight Chart #32381weight
  • STU Clarification request for GCR 9.1.4.D.3.a Splitter Definition #32414aero
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • STU Request Adjustment to Min Weight for STU BMW E36 M3 (95-99) #31535weight -90 lbs
  • STU BMW E36 M3 Canadian (North American) S50B32 engine #31866engine
  • STU Engine Swap Origin Country #32209engine
  • STU CRX/Civic Del Sol #32214cars added
  • STU Error correction #32383weight
  • STU Single TB Weight Modifiers Add to Chart #32393weight
  • STU Single TB Weight Modifiers #31449weight
  • STU Request to Remove A4 1.8t from STU Spec Line Tables #31465weight
  • STU Improved Touring Tires #32063tyres & wheels
  • STU Request Allowance for Balance Shaft Delete in STU #31434engine
  • STU Request Louvers in hood vents #31916other
  • AS Proposed Revisions to SCCA GCR 2021 Appendix M, Part 3 #30295other
  • AS specification line consolidation and correction #31846wording
  • AS correction of SMG specification line #31847suspension & brakes
  • AS Alternate cylinder heads for full prep engine builds - Evaluation #31851engine
  • STU Request to Add Honda K23 Spec Line #30682cars added
  • STU RE: Aug FT letter 30682 #31060other
  • STU Throttling Device Clarification #31323induction
  • SRF3 Three Updates to SRF Rules #31523weight
  • AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other
  • AS Request Pontiac GTO tire size change #30881weight
Indianapolis Motor Speedway Runoffs 20212021-09-251:47.078Joe Moser · fastest of 30 · top 5 within 2.0s-1.843s (-1.69%)1:47.441Joe Moser · fastest of 28 · top 5 within 1.8s-1.946s (-1.78%)146.9Kip VanSteenburg1:50.427Drew Cattell · fastest of 31 · top 5 within 1.9s+5.207s (+4.95%)1:50.606Gregory Eaton · fastest of 28 · top 5 within 1.7s-0.901s (-0.81%)153.8James Jost+3.165squal +3.349s102.9%qual 103.1%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+11.396squal +10.617s110.6%qual 109.9%1:49.520Franklin Futrelle · fastest of 84 · top 5 within 0.5s-0.304s (-0.28%)1:50.095John Black · fastest of 82 · top 5 within 0.2s+0.313s (+0.29%)132.1Matthew Horst+2.654squal +2.442s102.5%qual 102.3%
33 rule changes (STU: 12, AS: 14, SM: 1, SRF3: 6)11 weight · 6 engine · 4 cars added · 3 tyres & wheels · 2 suspension & brakes · 1 aero · 3 wording · 3 othershowhide
  • SRF3 SRF Wet Tires #30849tyres & wheels
  • SRF3 SADEV-SRF3 Transmission #30926other
  • SRF3 SRF Update Maintenance, Repairs and Seals #30961engine
  • STU STU Fender flares #30696tyres & wheels
  • STU Request weight reduction for 12A bridgeport motor in Miata #30751weight -200 lbs
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • AS Request to consolidate SN95 Mustang '94-'04 Mustang spec lines #30428cars added
  • AS American Sedan Transmission Rule Change Request #30595weight
  • AS Correction to specifications inadvertently deleted #30691wording
  • AS weight adjustments #30700weight +50 lbs
  • SRF3 SRF3 Alternator Pulley #30684weight
  • STU Request for Fender Flare Clarification #30375weight
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • STU Provision for Interchangeable Engine Components Already Allowed #30342engine
  • STU ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • AS AS Mustang LP 4.6 3V Classification Transmission Request #29886weight
  • AS Request CF driveshaft on CTS-V for durability improvement #30117engine
  • AS Adjustment to model years of 5th generation RP Camaro #30348engine
  • SRF3 Mandatory identification: #30223engine
  • STU Super Touring Alternate Miata Hubs #30345tyres & wheels
  • STU Brake Component Relocation #29990suspension & brakes
  • STU Porsche PDK #30081weight
  • STU Reference Letter #29333 Proposed STU 13B Spec Line Changes #30086weight
  • STU Drive Shaft Request #30087other
  • AS Request for 2015 -2017 Ford Mustang Spec Line #29514cars added
  • AS Request Trunk lid / Rear Hatch clarification #29591wording
  • AS Common Weight for CTS-V Tire #29759weight
  • AS Correction to specifications inadvertently deleted #30041cars added
  • STU 13B Rules Adjustment #29333cars added
  • AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine
  • AS Rule simplification spec line communization #29824weight
  • SRF3 SRF Shocks, Springs and Ride Height. #29688suspension & brakes
  • STU Request clarification on wing measurement #29640aero
Road America Runoffs 20202020-10-022:27.883David Fiorelli · fastest of 14 · top 5 within 4.1s2:28.410Anthony Geraci · fastest of 14 · top 5 within 3.1s144.2David Fiorelli2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton-0.742squal -0.838s99.5%qual 99.4%2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill+15.338squal +14.326s110.3%qual 109.7%2:29.786TJ Acker · fastest of 59 · top 5 within 0.5s2:31.038Justin Hille · fastest of 55 · top 5 within 0.2s131.9Charles Russell Turner+2.628squal +1.903s101.8%qual 101.3%
42 rule changes (STU: 17, AS: 16, SM: 2, SRF3: 7)8 induction · 8 weight · 7 engine · 7 suspension & brakes · 3 aero · 3 tyres & wheels · 2 cars added · 4 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • STU Request for Advanced Aero Rule Wording Clarification. #29124aero
  • AS Dodge Challenger AS Spec Line Clarification #28698induction
  • AS Dodge Challenger AS Spec Line Clarification #2 #28699aero
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • STU Minimum Weight Determination #27695weight
  • STU ST Gurney flap Wicker clarification #29012aero
  • AS Support for R-Type Specification Tires #27450tyres & wheels
  • AS Spec Tire Request #27519tyres & wheels
  • AS Restrictor Plate Change for RP 2011+ Mustang with Coyote Engine #27675induction
  • AS 2005-2009 Restricted Prep 4.6 3V #27908engine
  • AS Request for 2005-2009 Restricted Prep 4.6 3V Parts #27909engine
  • AS Request for Full Preparation Classification for 2010-2014 Camaro #28030other
  • AS Cylinder Heads #28696engine
  • AS Request for Max Rotor Diameter Change #28748suspension & brakes
  • AS Request increase rotor diameter #28797other
  • STU Request for Alternate Intake Manifold #26514induction
  • STU Request for Addition to GT3 Approved Turbo List #27576induction
  • STU Request BoP for my Car #29004induction
  • STU Sequential Shifters in STU #29031other
  • SRF3 SRF Shocks #28791suspension & brakes
  • STU Rotary Help #27833weight
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • SRF3 Update Bump Stop Rule #28712suspension & brakes
  • SRF3 SRF Bump Stop Correction #27019suspension & brakes
  • STU Request to approve Honda S2000 HKS supercharger #27281engine
  • STU Request BoP on the Lotus #27637weight +100 lbs
  • STU Turbo Inlet Restrictor On MK5 Volkswagen #27704induction
  • STU Honda K20C1 removal #27732induction
  • STU Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine
  • STU Alternate Engine for Porsche 944 #28259engine
  • STU Please Modify the STU Wheel Size Rule for Clarity #27694weight
  • STU Turbo Engine Cars Base Weight #28032weight
  • AS Rear Trailing Arms #28007suspension & brakes
  • AS Weight reduction for cars running iron heads #28010weight
  • AS 05-10 Mustang with HR cam classification #28226cars added
  • AS 10-15 Camaro Full Prep classification #28227cars added
  • SRF3 SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • SRF3 SRF Tire Warmer Rule #27622tyres & wheels
  • SRF3 SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF3 SRF / SRF3 Majors & Regional Class Updates #27723other
  • STU Request for an electronic throttle body #27342induction
Virginia International Raceway Runoffs 20192019-10-051:59.948Kevin Boehm · fastest of 25 · top 5 within 3.5s2:00.483Kevin Boehm · fastest of 25 · top 5 within 2.5s143.8Kevin Boehm2:02.938Gregory Eaton · fastest of 17 · top 5 within 0.8s2:03.900James Jost · fastest of 16 · top 5 within 2.1s153.9James Jost+3.417squal +2.990s102.8%qual 102.5%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+15.976squal +14.604s113.3%qual 112.2%2:04.624Brian Schofield · fastest of 54 · top 5 within 0.6s2:04.755Bobby Sak · fastest of 53 · top 5 within 0.3s132.4Bobby Sak+4.272squal +4.676s103.5%qual 103.9%
33 rule changes (STU: 22, AS: 4, SM: 4, SRF3: 3)7 weight · 6 induction · 4 cars added · 4 suspension & brakes · 3 aero · 2 engine · 2 tyres & wheels · 2 wording · 3 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • STU Request to correct E&O advanced aerodynamics #27290aero
  • AS Request Ride Height Clarification #26598suspension & brakes
  • SRF3 SRF Dash Windscreen Kit #27028other
  • STU Remove -2mm penalty from SR20DET Nissan #26982weight
  • STU Request clarification for manifold and throttle in STU #27004induction
  • AS Request to Revert to 2017 Weights #25885weight
  • SRF3 New SRF Sectional Nose Rule Addition #26914other
  • STU Request to clarify afterrmarket side skirts exhaust exit #26814suspension & brakes
  • STU Wheel Flare wording #26872tyres & wheels
  • SRF3 SRF Brakes and Shock Rule Changes #26629suspension & brakes
  • STU Request Ride Height Clarification #26597suspension & brakes
  • STU Request to Use Japanese Mazda 13b Intake Manifold #25790induction
  • STU Request Alternate Intake for Mazda MZR In a Rear Wheel Drive App. #26352induction
  • STU E&O Suspension #26424wording
  • STU Revisit B20 VTEC #26530cars added
  • STU Move Flared Fenders to STU Advanced Aero #26564aero
  • STU TCA Civic SI E&O #26606induction
  • STU S54 Spec line #26620weight
  • SM Request to allow aftermarket fuel filters. #26370wording
  • STU Request to Class Assignment for 2017 Civic #24287cars added
  • STU Request to run E46 3246cc in STU #25126weight
  • STU Engine Classification for Rotary #25564engine
  • STU K24/K20 Head Swap Clarification/Amendment #25899induction
  • STU Request to Classify 12a Bridge Ported Rotary Engine #25985cars added
  • STU World Challenge Car Eligibility #26387weight
  • STU Request a phone call for discussion regarding weight #26398weight
  • STU Advanced Aero E&O #26413aero
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • SM Request 99-00 replacement Wire harnesses #25602engine
  • SM Organize and Clarify 9.1.7.C.1.o. #25913weight
  • SM Strike Tire Tread Language #26123tyres & wheels
  • STU Request to Equalize Direct Injected Turbo Cars #24890induction
Sonoma Raceway Runoffs 20182018-10-101:19.234Franklin Church · fastest of 10 · top 5 within 21.5s1:46.514Kevin Boehm · fastest of 9 · top 5 within 7.4s103.0Franklin Church1:47.782Andrew McDermid · fastest of 12 · top 5 within 1.9s1:50.345John Heinricy · fastest of 10 · top 5 within 2.3s105.0Kevin Fandozzi+3.831squal +28.548s103.6%qual 136.0%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+8.764squal +35.121s108.2%qual 144.3%1:46.117Robeson Clay Russell · fastest of 36 · top 5 within 0.5s1:47.053TJ Acker · fastest of 35 · top 5 within 0.2s110.2Steve Fogg+0.539squal +26.883s100.5%qual 133.9%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:48.921Rob Huffmaster · fastest of 34 · top 5 within 2.0s1:49.387Rob Huffmaster · fastest of 31 · top 5 within 2.4s1:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s+2.120squal -3.701s101.9%qual 96.6%1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+9.713squal +9.385s108.9%qual 108.6%1:49.824John Black · fastest of 101 · top 5 within 0.5s1:49.782Tray Ayres · fastest of 94 · top 5 within 0.4s+0.395squal +0.903s100.4%qual 100.8%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:32.738Joe Moser · fastest of 16 · top 5 within 2.5s1:34.597Cameron Maugeri · fastest of 16 · top 5 within 0.8s1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s-1.173squal -2.087s98.8%qual 97.7%1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+6.167squal +7.776s106.5%qual 108.4%1:34.363John Black · fastest of 41 · top 5 within 0.5s1:34.947Cliff White · fastest of 39 · top 5 within 0.3s+0.350squal +1.625s100.4%qual 101.8%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:05.494Eric Heinrich · fastest of 18 · top 5 within 4.6s2:06.756Eric Heinrich · fastest of 17 · top 5 within 3.5s2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s-3.834squal -3.748s97.0%qual 97.0%2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+17.311squal +13.167s113.7%qual 110.5%2:08.557Kerry Jacobsen · fastest of 29 · top 5 within 1.1s2:10.215Chad Galloway · fastest of 29 · top 5 within 0.3s+3.459squal +3.063s102.7%qual 102.4%

By track

TrackEvents Typical % of STU 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 STU'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.