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BoP Lab / Classes / SM

SM vs STL vs AS pace at every track

Lap times across years say as much about the weather as the class. % of SM is each class's best lap as a share of SM'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)
vsAS×B-Spec+EP+FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+P+P2+SM×SMX+SRF3+vsSTL×STU+T1+T2+T3+T4+Show 51 inactive classes
Series
Reference · what % is measured against, 12 events
Tracks · untick to narrow

Closest to the field: SM 100.0% of SM Todd Lamb, Daytona International Speedway Runoffs 2015 race · STL 90.4% of SM Kevin Boehm, Daytona International Speedway Runoffs 2015 race · AS 85.3% of SM Andy McDermid, Daytona International Speedway Runoffs 2015 race

1:402:002:202:4019 rule changes between Runoffs 2018 and Runoffs 201919 ▾29 rule changes between Runoffs 2019 and Runoffs 202029 ▾30 rule changes between Runoffs 2020 and Runoffs 202130 ▾15 rule changes between Runoffs 2021 and Runoffs 202215 ▾7 rule changes between Runoffs 2022 and Runoffs 20237 ▾19 rule changes between Runoffs 2023 and Runoffs 202419 ▾18 rule changes between Runoffs 2024 and Runoffs 202518 ▾19 rule changes between Runoffs 2025 and Runoffs 202619 ▾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)STL race best at Runoffs 2015: 2:10.269 (Kevin Boehm)STL race best at Runoffs 2016: 1:36.625 (Kevin Boehm)STL race best at Runoffs 2017: 1:52.589 (Eric Kutil)STL race best at Runoffs 2018: 1:49.754 (Danny Steyn)STL race best at Runoffs 2019: 2:07.273 (Cliff Ira)STL race best at Runoffs 2020: 2:32.115 (Joe Moser)STL race best at Runoffs 2021: 2:02.711 (Joe Moser)STL race best at Runoffs 2022: 2:07.832 (Danny Steyn)STL race best at Runoffs 2023: 2:06.682 (Joe Moser)STL race best at Runoffs 2024: 2:30.245 (Joe Moser)STL race best at Runoffs 2025: 2:32.127 (Jose Osiris Pena)STL race best at Runoffs 2026: 2:30.657 (Danny Steyn)STL qualifying best at Runoffs 2015: 2:09.672 (Kevin Boehm)STL qualifying best at Runoffs 2016: 1:35.439 (John Schmitt)STL qualifying best at Runoffs 2017: 1:52.647 (Adam Roberts)STL qualifying best at Runoffs 2018: 1:49.138 (Danny Steyn)STL qualifying best at Runoffs 2019: 2:07.203 (Danny Steyn)STL qualifying best at Runoffs 2020: 2:31.420 (Danny Steyn)STL qualifying best at Runoffs 2021: 1:51.665 (Danny Steyn)STL qualifying best at Runoffs 2022: 2:05.474 (Danny Steyn)STL qualifying best at Runoffs 2023: 2:05.779 (Danny Steyn)STL qualifying best at Runoffs 2024: 2:30.063 (Joe Moser)STL qualifying best at Runoffs 2025: 2:32.065 (Jose Osiris Pena)STL qualifying best at Runoffs 2026: 2:30.537 (Derek Ketchie)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)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
SMSTLASsolid race · dashed qualifying · slower is lower
88%90%92%94%96%98%100%19 rule changes between Runoffs 2018 and Runoffs 201919 ▾29 rule changes between Runoffs 2019 and Runoffs 202029 ▾30 rule changes between Runoffs 2020 and Runoffs 202130 ▾15 rule changes between Runoffs 2021 and Runoffs 202215 ▾7 rule changes between Runoffs 2022 and Runoffs 20237 ▾19 rule changes between Runoffs 2023 and Runoffs 202419 ▾18 rule changes between Runoffs 2024 and Runoffs 202518 ▾19 rule changes between Runoffs 2025 and Runoffs 202619 ▾SM race best at Runoffs 2015: 100.0% of SM's (Todd Lamb)SM race best at Runoffs 2016: 100.0% of SM's (Michael Carter)SM race best at Runoffs 2017: 100.0% of SM's (Michael Gagliardo)SM race best at Runoffs 2018: 100.0% of SM's (Michael Carter)SM race best at Runoffs 2019: 100.0% of SM's (Elivan Goulart)SM race best at Runoffs 2020: 100.0% of SM's (Preston Pardus)SM race best at Runoffs 2021: 100.0% of SM's (Brian Henderson)SM race best at Runoffs 2022: 100.0% of SM's (Travis Wiley)SM race best at Runoffs 2023: 100.0% of SM's (Julian DaCosta)SM race best at Runoffs 2024: 100.0% of SM's (Brett Kowalski)SM race best at Runoffs 2025: 100.0% of SM's (Kyle Greenhill)SM race best at Runoffs 2026: 100.0% of SM's (Francisco Barroso)SM qualifying best at Runoffs 2015: 100.0% of SM's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 100.0% of SM's (Justin Hille)SM qualifying best at Runoffs 2017: 100.0% of SM's (Chris Haldeman)SM qualifying best at Runoffs 2018: 100.0% of SM's (Ken Sutherland)SM qualifying best at Runoffs 2019: 100.0% of SM's (Todd Buras)SM qualifying best at Runoffs 2020: 100.0% of SM's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 100.0% of SM's (Brian Henderson)SM qualifying best at Runoffs 2022: 100.0% of SM's (Danny Steyn)SM qualifying best at Runoffs 2023: 100.0% of SM's (Danny Steyn)SM qualifying best at Runoffs 2024: 100.0% of SM's (Ethan Goulart)SM qualifying best at Runoffs 2025: 100.0% of SM's (Bobby Gossett)SM qualifying best at Runoffs 2026: 100.0% of SM's (Brett Kowalski)STL race best at Runoffs 2015: 90.4% of SM's (Kevin Boehm)STL race best at Runoffs 2016: 95.9% of SM's (Kevin Boehm)STL race best at Runoffs 2017: 94.5% of SM's (Eric Kutil)STL race best at Runoffs 2018: 95.2% of SM's (Danny Steyn)STL race best at Runoffs 2019: 93.3% of SM's (Cliff Ira)STL race best at Runoffs 2020: 92.9% of SM's (Joe Moser)Off the chart: STL race best at Runoffs 2021: 103.3% of SM's (Joe Moser)STL race best at Runoffs 2022: 91.9% of SM's (Danny Steyn)STL race best at Runoffs 2023: 93.0% of SM's (Joe Moser)STL race best at Runoffs 2024: 93.0% of SM's (Joe Moser)STL race best at Runoffs 2025: 92.5% of SM's (Jose Osiris Pena)STL race best at Runoffs 2026: 92.6% of SM's (Danny Steyn)STL qualifying best at Runoffs 2015: 93.5% of SM's (Kevin Boehm)STL qualifying best at Runoffs 2016: 95.0% of SM's (John Schmitt)STL qualifying best at Runoffs 2017: 95.2% of SM's (Adam Roberts)STL qualifying best at Runoffs 2018: 95.4% of SM's (Danny Steyn)STL qualifying best at Runoffs 2019: 94.5% of SM's (Danny Steyn)STL qualifying best at Runoffs 2020: 93.3% of SM's (Danny Steyn)STL qualifying best at Runoffs 2021: 94.9% of SM's (Danny Steyn)STL qualifying best at Runoffs 2022: 93.2% of SM's (Danny Steyn)STL qualifying best at Runoffs 2023: 93.2% of SM's (Danny Steyn)STL qualifying best at Runoffs 2024: 93.1% of SM's (Joe Moser)STL qualifying best at Runoffs 2025: 93.2% of SM's (Jose Osiris Pena)STL qualifying best at Runoffs 2026: 92.8% of SM's (Derek Ketchie)Off the chart: AS race best at Runoffs 2015: 85.3% of SM's (Andy McDermid)AS race best at Runoffs 2016: 92.7% of SM's (Edward Hosni)AS race best at Runoffs 2017: 93.6% of SM's (Bryan Long)AS race best at Runoffs 2018: 95.7% of SM's (John Heinricy)AS race best at Runoffs 2019: 90.8% of SM's (James Jost)AS race best at Runoffs 2020: 90.2% of SM's (Gregory Eaton)AS race best at Runoffs 2021: 93.1% of SM's (Gregory Eaton)AS race best at Runoffs 2022: 89.6% of SM's (Gregory Eaton)AS race best at Runoffs 2023: 91.1% of SM's (Gregory Eaton)AS race best at Runoffs 2024: 90.7% of SM's (Gregory Eaton)AS race best at Runoffs 2025: 90.8% of SM's (Gregory Eaton)AS race best at Runoffs 2026: 91.2% of SM's (Andrew McDermid)AS qualifying best at Runoffs 2015: 87.8% of SM's (Tom Sloe)AS qualifying best at Runoffs 2016: 90.2% of SM's (Tom Sloe)AS qualifying best at Runoffs 2017: 88.9% of SM's (James Jost)AS qualifying best at Runoffs 2018: 94.3% of SM's (Andrew McDermid)AS qualifying best at Runoffs 2019: 91.4% of SM's (Gregory Eaton)AS qualifying best at Runoffs 2020: 90.7% of SM's (Gregory Eaton)AS qualifying best at Runoffs 2021: 93.8% of SM's (Drew Cattell)AS qualifying best at Runoffs 2022: 90.7% of SM's (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 91.2% of SM's (Daniel Richardson)AS qualifying best at Runoffs 2024: 91.0% of SM's (Gregory Eaton)AS qualifying best at Runoffs 2025: 90.0% of SM's (Andrew McDermid)AS qualifying best at Runoffs 2026: 90.6% of SM's (Andrew McDermid)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
SMSTLASsolid race · dashed qualifying · each class's best lap as a share of SM's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSMSTLAS
Qual best Race best Trap Qual best Race best Trap vs SM % of SM Qual best Race best Trap vs SM % of SM 
Road America Runoffs 20262026-09-282:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%)2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%)119.6Wyatt Couch+0.3 mph (+0.3%)2:30.537Derek Ketchie · fastest of 16 · top 5 within 2.9s-1.528s (-1.00%)2:30.657Danny Steyn · fastest of 16 · top 5 within 0.6s-1.470s (-0.97%)134.8Mike Taylor+2.6 mph (+2.0%)-12.068squal -11.636s92.6%qual 92.8%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%)-14.254squal -15.262s91.2%qual 90.6%
19 rule changes (SM: 2, STL: 4, AS: 13)8 weight · 3 engine · 2 removed · 2 tyres & wheels · 1 induction · 1 wording · 2 othershowhide
  • AS 2016+ Camaro Spec Line Full Prep #39646tyres & wheels
  • AS Consideration of Pirelli P Zero Trofeo Track for AS Competition #40495tyres & wheels
  • AS Change in 9.1.6.D.4.d.5 in Suspension Mounting Points #40094other
  • AS Re-Add 4.6L 4v 96-04 Mustang Cobra #40239weight
  • AS Errors and Omissions #40532weight
  • SM Rear Toe Link #40271other
  • STL Spec Line Clean Up #40344removed
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • STL Calculating Weight #40224weight
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • SM Part Number Change Request #39914wording
  • STL Classifications #39885weight
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • STL Weight adjustment for STL #39579weight
  • AS 1994 Mustang Spec Line Request #39104engine
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
Road America Runoffs 20252025-09-292:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%)2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%)119.3Francisco Barroso-0.6 mph (-0.5%)2:32.065Jose Osiris Pena · fastest of 14 · top 5 within 3.4s+2.002s (+1.33%)2:32.127Jose Osiris Pena · fastest of 13 · top 5 within 2.4s+1.882s (+1.25%)132.2Jon Sewell-2.1 mph (-1.5%)-12.303squal -11.046s92.5%qual 93.2%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%)-15.198squal -16.319s90.8%qual 90.0%
18 rule changes (SM: 4, STL: 3, AS: 11)5 engine · 5 weight · 2 induction · 2 tyres & wheels · 1 wording · 3 othershowhide
  • STL Lotus Weight Reduction #38772weight -50 lbs
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • AS Errors and Omissions #38234engine
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • 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
  • STL E&O: SMX Allowance in STL #37945weight
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • AS Race memo #37902engine
  • AS Increase Coyote Engine Restrictor to 80mm #36177induction
  • AS Performance Pack for 2015+ Mustang #36867weight
  • AS Gear Ratios #37131engine
  • AS ECU specs for LS engine #37208engine
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • STL Request to Remove Miata Hubs from General category #37138tyres & wheels
Road America Runoffs 20242024-10-012:41.106Ethan Goulart · fastest of 49 · top 5 within 0.5s-1.103s (-0.68%)2:41.486Brett Kowalski · fastest of 43 · top 5 within 0.3s-2.262s (-1.38%)119.9Alex Bertagnoli-1.4 mph (-1.2%)2:30.063Joe Moser · fastest of 18 · top 5 within 3.7s-1.357s (-0.90%)2:30.245Joe Moser · fastest of 16 · top 5 within 4.2s-1.870s (-1.23%)134.3Joe Moser+1.3 mph (+1.0%)-11.241squal -11.043s93.0%qual 93.1%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%)-15.057squal -14.528s90.7%qual 91.0%
19 rule changes (SM: 4, STL: 4, AS: 11)6 cars added · 2 engine · 2 induction · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 1 wording · 5 othershowhide
  • AS Mustang transmission ratios #36662engine
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • AS Request for Classification of 2018-2023 mustang In #35764cars added
  • AS 6th gen Camaro limited prep #35733cars added
  • AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK #35825cars added
  • AS Full Prep Head #35891other
  • AS Restricted Prep Aftermarket Parts Request #35682other
  • AS Allowance of 11 #35824tyres & wheels
  • 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
  • STL ST Electric-Assisted Steering Systems #35066other
  • STL BOP Adjustments #35112weight
  • STL Mazda 12A #35320induction
  • STL Alternate Carburetor Request for 79-85 RX7 12a #35181induction
Virginia International Raceway Runoffs 20232023-09-232:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%)2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%)120.3Jim Drago+1.1 mph (+0.9%)2:05.779Danny Steyn · fastest of 22 · top 5 within 3.4s+0.305s (+0.24%)2:06.682Joe Moser · fastest of 20 · top 5 within 1.5s-1.150s (-0.90%)131.8Danny Steyn+0.1 mph (+0.1%)-9.547squal -9.207s93.0%qual 93.2%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%)-12.109squal -11.904s91.1%qual 91.2%
7 rule changes (SM: 1, STL: 2, AS: 4)3 tyres & wheels · 2 engine · 1 suspension & brakes · 1 weightshowhide
  • 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
  • STL Clarify STL table B - IT spec notes on Tires #34187tyres & wheels
  • SM BOP for NB1 and NB2 #32309weight
  • STL Spec MX5 in STL #33473tyres & wheels
Virginia International Raceway Runoffs 20222022-09-242:14.664Danny 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%)2:05.474Danny Steyn · fastest of 24 · top 5 within 2.3s-1.729s (-1.36%)2:07.832Danny Steyn · fastest of 22 · top 5 within 1.9s+0.559s (+0.44%)131.7Trever Degioanni-3.2 mph (-2.3%)-11.275squal -9.190s91.9%qual 93.2%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%)-14.529squal -12.502s89.6%qual 90.7%
15 rule changes (SM: 1, STL: 5, AS: 9)3 weight · 2 induction · 2 suspension & brakes · 1 engine · 1 tyres & wheels · 3 wording · 3 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • STL Single TB Weight Modifiers #31449weight
  • STL Improved Touring Tires #32063tyres & wheels
  • AS Proposed Revisions to SCCA GCR 2021 Appendix M, Part 3 #30295other
  • AS specification line consolidation and correction #31846wording
  • AS correction of SMG specification line #31847suspension & brakes
  • AS Alternate cylinder heads for full prep engine builds - Evaluation #31851engine
  • STL Throttling Device Clarification #31323induction
  • STL Mazda Renesis Restriction #31467induction
  • STL Clarification of 79-85 RX7 Spec line #31621wording
  • 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 20212021-09-251:57.695Brian 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 Greenhill1:51.665Danny Steyn · fastest of 42 · top 5 within 1.7s-0.982s (-0.87%)2:02.711Joe Moser · fastest of 37 · top 5 within 3.2s+10.122s (+8.99%)131.8Max Gee+3.874squal -6.030s103.3%qual 94.9%1:50.427Drew 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-8.231squal -7.268s93.1%qual 93.8%
30 rule changes (SM: 1, STL: 15, AS: 14)8 weight · 5 engine · 4 cars added · 2 aero · 2 induction · 2 suspension & brakes · 1 tyres & wheels · 3 wording · 3 othershowhide
  • STL Request to clean up Spec MX-5 Redundancy #31069other
  • 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
  • STL VW Engine Request #30625engine
  • STL Solstice Ride Height #30183suspension & brakes
  • STL Request Mazda B5 DOHC #30420cars added
  • STL Honda B16A (JDM) Restrictor change #30531induction
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • STL 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
  • STL GM Ecotec engines in STL #30247engine
  • STL Super Touring Alternate Miata Hubs #30345tyres & wheels
  • STL Brake Component Relocation #29990suspension & brakes
  • STL Super Touring Wing Clarification #30111aero
  • STL Transmission Options #30118other
  • 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
  • STL Request for FWD and RWD Parity #29728weight
  • STL Request to Remove Honda F20C 2% Weight Penalty #29815weight
  • STL Request for FWD and RWD Parity #30023induction
  • AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine
  • AS Rule simplification spec line communization #29824weight
  • STL Request clarification on wing measurement #29640aero
Road America Runoffs 20202020-10-022:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill2:31.420Danny Steyn · fastest of 33 · top 5 within 3.1s2:32.115Joe Moser · fastest of 30 · top 5 within 1.5s132.9Darin Treakle-11.633squal -10.789s92.9%qual 93.3%2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton-16.080squal -15.164s90.2%qual 90.7%
29 rule changes (SM: 2, STL: 11, AS: 16)6 engine · 6 induction · 3 cars added · 3 suspension & brakes · 3 tyres & wheels · 3 weight · 2 aero · 1 wording · 2 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • 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
  • STL Minimum Weight Determination #27695weight
  • STL 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
  • STL Request for Addition to GT3 Approved Turbo List #27576induction
  • STL Request to add 2016-2019 GMX-5 Spec line #28604cars added
  • STL Request to update PN for MX-5 #28622wording
  • STL Correction - Clarification Honda/Acura B18B engine Letter # 26209 #28873engine
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • STL STL Honda B18 restrictor changes #28794induction
  • STL Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine
  • STL Acura/Honda B18C engine chart. Reduce the current 54 mm flat plat #28663induction
  • STL Mazda MZR engine chart. Reduce the current 55 mm flat plate to 53 #28664induction
  • STL Request to add wheel part numbers #28342tyres & wheels
  • AS Rear Trailing Arms #28007suspension & brakes
  • AS Weight reduction for cars running iron heads #28010weight
  • AS 05-10 Mustang with HR cam classification #28226cars added
  • AS 10-15 Camaro Full Prep classification #28227cars added
Virginia International Raceway Runoffs 20192019-10-052:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago2:07.203Danny Steyn · fastest of 36 · top 5 within 1.8s2:07.273Cliff Ira · fastest of 35 · top 5 within 1.4s134.8Cliff Ira-9.186squal -7.349s93.3%qual 94.5%2:02.938Gregory Eaton · fastest of 17 · top 5 within 0.8s2:03.900James Jost · fastest of 16 · top 5 within 2.1s153.9James Jost-12.559squal -11.614s90.8%qual 91.4%
19 rule changes (SM: 4, STL: 11, AS: 4)6 weight · 3 suspension & brakes · 2 cars added · 2 engine · 2 induction · 1 tyres & wheels · 2 wording · 1 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • STL Request to Classify Spec MX-5 Challenge in STL #27399cars added
  • AS Request Ride Height Clarification #26598suspension & brakes
  • STL Request clarification for manifold and throttle in STU #27004induction
  • AS Request to Revert to 2017 Weights #25885weight
  • STL Request Restrictor Plate correction #26779induction
  • STL Request Ride Height Clarification #26597suspension & brakes
  • SM Request to allow aftermarket fuel filters. #26370wording
  • STL Request to Allow VW 1.8L Engine #25614engine
  • STL Request to reduce weight of RX8 with Renesis rotary #25781weight -100 lbs
  • STL Request for Open Brake Pads On Mazda MX-5 Cup NC #25821suspension & brakes
  • STL Request to clarify B18C1 GSR Honda B motor table #26209weight
  • STL Port Matching #26415wording
  • 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
  • STL Request to equalize FPR Reduction on all B-Series Vtec Engines #24746weight
  • STL Request E&O for Mazda Miata Spec Line #25955weight
Sonoma Raceway Runoffs 20182018-10-101:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn1:49.138Danny Steyn · fastest of 19 · top 5 within 2.5s1:49.754Danny Steyn · fastest of 17 · top 5 within 2.5s103.2Craig McHaffie-5.524squal -5.217s95.2%qual 95.4%1:47.782Andrew McDermid · fastest of 12 · top 5 within 1.9s1:50.345John Heinricy · fastest of 10 · top 5 within 2.3s105.0Kevin Fandozzi-4.933squal -6.573s95.7%qual 94.3%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s1:52.647Adam Roberts · fastest of 57 · top 5 within 0.8s1:52.589Eric Kutil · fastest of 50 · top 5 within 1.2s-6.511squal -5.659s94.5%qual 95.2%1:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s-7.593squal -13.086s93.6%qual 88.9%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s1:35.439John Schmitt · fastest of 34 · top 5 within 1.5s1:36.625Kevin Boehm · fastest of 31 · top 5 within 0.6s-4.139squal -5.075s95.9%qual 95.0%1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s-7.340squal -9.863s92.7%qual 90.2%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s2:09.672Kevin Boehm · fastest of 37 · top 5 within 2.5s2:10.269Kevin Boehm · fastest of 37 · top 5 within 2.1s-13.798squal -8.989s90.4%qual 93.5%2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s-21.145squal -16.915s85.3%qual 87.8%

By track

TrackEvents Typical % of SM 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 SM'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.