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BoP Lab / Classes / STL

STL vs P2 vs FV vs FE2 pace at every track

Lap times across years say as much about the weather as the class. % of STL is each class's best lap as a share of STL'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-SpecEPFAFCvsFE2×FFFPvsFV×FXGT1GT2GTXHPPvsP2×SMSMXSRF3STL×STUT1T2T3T4Show 51 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: STL 100.0% of STL Kevin Boehm, Daytona International Speedway Runoffs 2015 race · P2 77.7% of STL Tim Day Jr, Indianapolis Motor Speedway Runoffs 2021 race · FV 95.5% of STL Alex Scaler, Indianapolis Motor Speedway Runoffs 2021 race · FE2 78.8% of STL Max Grau, Indianapolis Motor Speedway Runoffs 2021 race

1:402:002:202:4026 rule changes between Runoffs 2018 and Runoffs 201926 ▾25 rule changes between Runoffs 2019 and Runoffs 202025 ▾23 rule changes between Runoffs 2020 and Runoffs 202123 ▾19 rule changes between Runoffs 2021 and Runoffs 202219 ▾10 rule changes between Runoffs 2022 and Runoffs 202310 ▾11 rule changes between Runoffs 2023 and Runoffs 202411 ▾5 rule changes between Runoffs 2024 and Runoffs 20255 ▾5 rule changes between Runoffs 2025 and Runoffs 20265 ▾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)P2 race best at Runoffs 2015: 1:52.355 (Jeff Shafer)Off the chart: P2 race best at Runoffs 2016: 1:20.904 (Jeff Shafer)P2 race best at Runoffs 2017: 1:32.481 (Jeff Shafer)P2 race best at Runoffs 2018: 1:32.071 (Chuck Bona)P2 race best at Runoffs 2019: 1:50.258 (Greg Gyann)P2 race best at Runoffs 2020: 2:09.793 (Robert Iversen)P2 race best at Runoffs 2021: 1:35.322 (Tim Day Jr)P2 race best at Runoffs 2022: 2:15.834 (Greg Gyann)P2 race best at Runoffs 2023: 1:48.829 (Lucian Pancea)P2 race best at Runoffs 2024: 2:08.322 (Bart Wolf)P2 race best at Runoffs 2026: 2:09.441 (Mike Reupert)P2 qualifying best at Runoffs 2015: 1:51.825 (Chris Farrell)Off the chart: P2 qualifying best at Runoffs 2016: 1:20.188 (Jeff Shafer)P2 qualifying best at Runoffs 2017: 1:31.826 (Jeff Shafer)P2 qualifying best at Runoffs 2018: 1:28.784 (Tim Day Jr)P2 qualifying best at Runoffs 2019: 1:49.111 (Robert Iversen)P2 qualifying best at Runoffs 2020: 2:08.514 (Robert Iversen)P2 qualifying best at Runoffs 2021: 1:33.235 (Tim Day Jr)P2 qualifying best at Runoffs 2022: 1:47.566 (Tim Day Jr)P2 qualifying best at Runoffs 2023: 1:48.590 (Greg Gyann)P2 qualifying best at Runoffs 2024: 2:07.405 (Bart Wolf)P2 qualifying best at Runoffs 2026: 2:10.606 (Greg Gyann)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)FE2 race best at Runoffs 2018: 1:35.563 (Flinn Lazier)FE2 race best at Runoffs 2019: 1:52.154 (Liam Snyder)FE2 race best at Runoffs 2020: 2:13.271 (Owen McAllister)FE2 race best at Runoffs 2021: 1:36.655 (Max Grau)FE2 race best at Runoffs 2022: 2:12.045 (Jason Conzo)FE2 race best at Runoffs 2023: 1:51.098 (Franklin Futrelle)FE2 race best at Runoffs 2024: 2:12.748 (Porter Aiken)FE2 race best at Runoffs 2025: 2:13.339 (Franklin Futrelle)FE2 race best at Runoffs 2026: 2:11.881 (Franklin Futrelle)FE2 qualifying best at Runoffs 2018: 1:35.040 (Flinn Lazier)FE2 qualifying best at Runoffs 2019: 1:51.062 (Liam Snyder)FE2 qualifying best at Runoffs 2020: 2:12.806 (Scott Rettich)FE2 qualifying best at Runoffs 2021: 1:36.395 (Max Grau)FE2 qualifying best at Runoffs 2022: 1:50.853 (Charles Russell Turner)FE2 qualifying best at Runoffs 2023: 1:50.665 (Charles Russell Turner)FE2 qualifying best at Runoffs 2024: 2:11.506 (Porter Aiken)FE2 qualifying best at Runoffs 2025: 2:12.475 (Franklin Futrelle)FE2 qualifying best at Runoffs 2026: 2:12.326 (Franklin Futrelle)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
STLP2FVFE2solid race · dashed qualifying · slower is lower
80%90%100%110%26 rule changes between Runoffs 2018 and Runoffs 201926 ▾25 rule changes between Runoffs 2019 and Runoffs 202025 ▾23 rule changes between Runoffs 2020 and Runoffs 202123 ▾19 rule changes between Runoffs 2021 and Runoffs 202219 ▾10 rule changes between Runoffs 2022 and Runoffs 202310 ▾11 rule changes between Runoffs 2023 and Runoffs 202411 ▾5 rule changes between Runoffs 2024 and Runoffs 20255 ▾5 rule changes between Runoffs 2025 and Runoffs 20265 ▾STL race best at Runoffs 2015: 100.0% of STL's (Kevin Boehm)STL race best at Runoffs 2016: 100.0% of STL's (Kevin Boehm)STL race best at Runoffs 2017: 100.0% of STL's (Eric Kutil)STL race best at Runoffs 2018: 100.0% of STL's (Danny Steyn)STL race best at Runoffs 2019: 100.0% of STL's (Cliff Ira)STL race best at Runoffs 2020: 100.0% of STL's (Joe Moser)STL race best at Runoffs 2021: 100.0% of STL's (Joe Moser)STL race best at Runoffs 2022: 100.0% of STL's (Danny Steyn)STL race best at Runoffs 2023: 100.0% of STL's (Joe Moser)STL race best at Runoffs 2024: 100.0% of STL's (Joe Moser)STL race best at Runoffs 2025: 100.0% of STL's (Jose Osiris Pena)STL race best at Runoffs 2026: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2015: 100.0% of STL's (Kevin Boehm)STL qualifying best at Runoffs 2016: 100.0% of STL's (John Schmitt)STL qualifying best at Runoffs 2017: 100.0% of STL's (Adam Roberts)STL qualifying best at Runoffs 2018: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2019: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2020: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2021: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2022: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2023: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2024: 100.0% of STL's (Joe Moser)STL qualifying best at Runoffs 2025: 100.0% of STL's (Jose Osiris Pena)STL qualifying best at Runoffs 2026: 100.0% of STL's (Derek Ketchie)P2 race best at Runoffs 2015: 86.2% of STL's (Jeff Shafer)P2 race best at Runoffs 2016: 83.7% of STL's (Jeff Shafer)P2 race best at Runoffs 2017: 82.1% of STL's (Jeff Shafer)P2 race best at Runoffs 2018: 83.9% of STL's (Chuck Bona)P2 race best at Runoffs 2019: 86.6% of STL's (Greg Gyann)P2 race best at Runoffs 2020: 85.3% of STL's (Robert Iversen)Off the chart: P2 race best at Runoffs 2021: 77.7% of STL's (Tim Day Jr)P2 race best at Runoffs 2022: 106.3% of STL's (Greg Gyann)P2 race best at Runoffs 2023: 85.9% of STL's (Lucian Pancea)P2 race best at Runoffs 2024: 85.4% of STL's (Bart Wolf)P2 race best at Runoffs 2026: 85.9% of STL's (Mike Reupert)P2 qualifying best at Runoffs 2015: 86.2% of STL's (Chris Farrell)P2 qualifying best at Runoffs 2016: 84.0% of STL's (Jeff Shafer)P2 qualifying best at Runoffs 2017: 81.5% of STL's (Jeff Shafer)P2 qualifying best at Runoffs 2018: 81.4% of STL's (Tim Day Jr)P2 qualifying best at Runoffs 2019: 85.8% of STL's (Robert Iversen)P2 qualifying best at Runoffs 2020: 84.9% of STL's (Robert Iversen)P2 qualifying best at Runoffs 2021: 83.5% of STL's (Tim Day Jr)P2 qualifying best at Runoffs 2022: 85.7% of STL's (Tim Day Jr)P2 qualifying best at Runoffs 2023: 86.3% of STL's (Greg Gyann)P2 qualifying best at Runoffs 2024: 84.9% of STL's (Bart Wolf)P2 qualifying best at Runoffs 2026: 86.8% of STL's (Greg Gyann)FV race best at Runoffs 2015: 108.3% of STL's (Andrew Whitston)FV race best at Runoffs 2016: 101.5% of STL's (Flinn Lazier)FV race best at Runoffs 2017: 103.0% of STL's (Michael Varacins)FV race best at Runoffs 2018: 103.5% of STL's (Alex Scaler)FV race best at Runoffs 2019: 108.7% of STL's (Zachary Whitston)FV race best at Runoffs 2020: 109.0% of STL's (Alex Scaler)FV race best at Runoffs 2021: 95.5% of STL's (Alex Scaler)FV race best at Runoffs 2022: 108.0% of STL's (Andrew Whitston)FV race best at Runoffs 2023: 107.8% of STL's (Andrew Abbott)FV race best at Runoffs 2024: 109.7% of STL's (Andrew Abbott)FV race best at Runoffs 2025: 109.6% of STL's (Zachary Whitston)FV race best at Runoffs 2026: 109.7% of STL's (Brian Farnham)FV qualifying best at Runoffs 2015: 108.9% of STL's (Roger Siebenaler)FV qualifying best at Runoffs 2016: 102.6% of STL's (Alex Scaler)FV qualifying best at Runoffs 2017: 102.8% of STL's (Michael Varacins)FV qualifying best at Runoffs 2018: 103.2% of STL's (Skip Streets)FV qualifying best at Runoffs 2019: 106.7% of STL's (Andrew Whitston)FV qualifying best at Runoffs 2020: 108.3% of STL's (Hunter Phelps-Barron)FV qualifying best at Runoffs 2021: 105.2% of STL's (Andrew Whitston)FV qualifying best at Runoffs 2022: 107.7% of STL's (Brian Farnham)FV qualifying best at Runoffs 2023: 107.8% of STL's (Andrew Whitston)FV qualifying best at Runoffs 2024: 108.4% of STL's (Andrew Whitston)FV qualifying best at Runoffs 2025: 107.9% of STL's (Andrew Abbott)FV qualifying best at Runoffs 2026: 110.6% of STL's (Zachary Whitston)FE2 race best at Runoffs 2018: 87.1% of STL's (Flinn Lazier)FE2 race best at Runoffs 2019: 88.1% of STL's (Liam Snyder)FE2 race best at Runoffs 2020: 87.6% of STL's (Owen McAllister)FE2 race best at Runoffs 2021: 78.8% of STL's (Max Grau)FE2 race best at Runoffs 2022: 103.3% of STL's (Jason Conzo)FE2 race best at Runoffs 2023: 87.7% of STL's (Franklin Futrelle)FE2 race best at Runoffs 2024: 88.4% of STL's (Porter Aiken)FE2 race best at Runoffs 2025: 87.6% of STL's (Franklin Futrelle)FE2 race best at Runoffs 2026: 87.5% of STL's (Franklin Futrelle)FE2 qualifying best at Runoffs 2018: 87.1% of STL's (Flinn Lazier)FE2 qualifying best at Runoffs 2019: 87.3% of STL's (Liam Snyder)FE2 qualifying best at Runoffs 2020: 87.7% of STL's (Scott Rettich)FE2 qualifying best at Runoffs 2021: 86.3% of STL's (Max Grau)FE2 qualifying best at Runoffs 2022: 88.3% of STL's (Charles Russell Turner)FE2 qualifying best at Runoffs 2023: 88.0% of STL's (Charles Russell Turner)FE2 qualifying best at Runoffs 2024: 87.6% of STL's (Porter Aiken)FE2 qualifying best at Runoffs 2025: 87.1% of STL's (Franklin Futrelle)FE2 qualifying best at Runoffs 2026: 87.9% of STL's (Franklin Futrelle)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
STLP2FVFE2solid race · dashed qualifying · each class's best lap as a share of STL's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSTLP2FVFE2
Qual best Race best Trap Qual best Race best Trap vs STL % of STL Qual best Race best Trap vs STL % of STL Qual best Race best Trap vs STL % of STL 
Road America Runoffs 20262026-09-282:30.537Derek 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%)2:10.606Greg Gyann · fastest of 11 · top 5 within 5.3s+3.201s (+2.51%)2:09.441Mike Reupert · fastest of 11 · top 5 within 4.2s+1.119s (+0.87%)155.0Matt Strand+2.4 mph (+1.6%)-21.216squal -19.931s85.9%qual 86.8%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%)+14.615squal +15.999s109.7%qual 110.6%2:12.326Franklin Futrelle · fastest of 8 · top 5 within 1.9s-0.149s (-0.11%)2:11.881Franklin Futrelle · fastest of 8 · top 5 within 1.6s-1.458s (-1.09%)143.5Steve Whitston-5.5 mph (-3.7%)-18.776squal -18.211s87.5%qual 87.9%
5 rule changes (STL: 4, FE2: 1)3 weight · 1 removed · 1 othershowhide
  • STL Spec Line Clean Up #40344removed
  • STL Calculating Weight #40224weight
  • STL Classifications #39885weight
  • STL Weight adjustment for STL #39579weight
  • FE2 FE & FE2 Bubble Tail #38978other
Road America Runoffs 20252025-09-292:32.065Jose 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%)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%)+14.609squal +12.036s109.6%qual 107.9%2:12.475Franklin Futrelle · fastest of 11 · top 5 within 1.4s+0.969s (+0.74%)2:13.339Franklin Futrelle · fastest of 10 · top 5 within 0.6s+0.591s (+0.45%)149.0Steve Whitston+3.7 mph (+2.6%)-18.788squal -19.590s87.6%qual 87.1%
5 rule changes (STL: 3, P2: 1, FE2: 1)3 weight · 1 tyres & wheels · 1 othershowhide
  • STL Lotus Weight Reduction #38772weight -50 lbs
  • STL E&O: SMX Allowance in STL #37945weight
  • FE2 Driver Safety & Comfort #37965other
  • P2 2000 cc Pinto Engine Car Weight #37187weight
  • STL Request to Remove Miata Hubs from General category #37138tyres & wheels
Road America Runoffs 20242024-10-012:30.063Joe 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%)2:07.405Bart Wolf · fastest of 14 · top 5 within 3.0s-1.109s (-0.86%)2:08.322Bart Wolf · fastest of 13 · top 5 within 0.6s-1.471s (-1.13%)152.5Lucian Pancea-0.6 mph (-0.4%)-21.923squal -22.658s85.4%qual 84.9%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%)+14.589squal +12.580s109.7%qual 108.4%2:11.506Porter Aiken · fastest of 18 · top 5 within 0.5s-1.300s (-0.98%)2:12.748Porter Aiken · fastest of 17 · top 5 within 2.0s-0.523s (-0.39%)145.3Porter Aiken+1.9 mph (+1.3%)-17.497squal -18.557s88.4%qual 87.6%
11 rule changes (STL: 4, P2: 5, FV: 2)4 engine · 2 induction · 2 tyres & wheels · 1 suspension & brakes · 1 weight · 1 othershowhide
  • FV Disc Brakes #36822suspension & brakes
  • P2 CN Spec ECU #35835engine
  • P2 E&O - Correct FIA Group CN spec line notes #35900tyres & wheels
  • STL ST Electric-Assisted Steering Systems #35066other
  • STL BOP Adjustments #35112weight
  • STL Mazda 12A #35320induction
  • P2 E&O - Clarify B.1 modified engine range in AMAC spec lines #35225engine
  • P2 Replacement Engine Crankcase for 07/08 Suzuki GSX-R1000 Engines #35340engine
  • STL Alternate Carburetor Request for 79-85 RX7 12a #35181induction
  • FV FV Wheel Bearing Clarification #35150tyres & wheels
  • P2 Correct Table 1 for Engine Date Range Specifications #35182engine
Virginia International Raceway Runoffs 20232023-09-232:05.779Danny 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%)1:48.590Greg Gyann · fastest of 12 · top 5 within 1.7s+1.024s (+0.95%)1:48.829Lucian Pancea · fastest of 11 · top 5 within 0.9s-27.005s (-19.88%)150.9Lucian Pancea-0.2 mph (-0.2%)-17.853squal -17.189s85.9%qual 86.3%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%)+9.929squal +9.860s107.8%qual 107.8%1:50.665Charles Russell Turner · fastest of 26 · top 5 within 2.3s-0.188s (-0.17%)1:51.098Franklin Futrelle · fastest of 19 · top 5 within 1.4s-20.947s (-15.86%)141.3Franklin Futrelle-0.6 mph (-0.4%)-15.584squal -15.114s87.7%qual 88.0%
10 rule changes (STL: 2, P2: 8)3 tyres & wheels · 3 weight · 2 engine · 1 cars added · 1 wordingshowhide
  • STL Clarify STL table B - IT spec notes on Tires #34187tyres & wheels
  • P2 Clarify minimum side body height requirement #34143tyres & wheels
  • P2 Clarify closed cockpit single seat car allowance #34144wording
  • P2 Remove redundant effective date language and update engine table #34012engine
  • P2 E&O - Correct dimensional equivalents #34038weight
  • P2 Request to Classify Sebeco NP01 #33378cars added
  • P2 Radical spec line clarifications #33485weight
  • P2 E&O original class intent #33519weight
  • P2 Update Engine Table Spec Line B.1 #33608engine
  • STL Spec MX5 in STL #33473tyres & wheels
Virginia International Raceway Runoffs 20222022-09-242:05.474Danny 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%)1:47.566Tim Day Jr · fastest of 12 · top 5 within 3.0s-1.545s (-1.42%)2:15.834Greg Gyann · fastest of 12 · top 5 within 10.1s+25.576s (+23.20%)151.1Robert Iversen+1.8 mph (+1.2%)+8.002squal -17.908s106.3%qual 85.7%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%)+10.261squal +9.642s108.0%qual 107.7%1:50.853Charles Russell Turner · fastest of 25 · top 5 within 1.1s-0.209s (-0.19%)2:12.045Jason Conzo · fastest of 22 · top 5 within 1.8s+19.891s (+17.74%)141.9Eric Cruz-0.6 mph (-0.5%)+4.213squal -14.621s103.3%qual 88.3%
19 rule changes (STL: 5, P2: 10, FV: 4)6 weight · 4 tyres & wheels · 2 engine · 2 induction · 1 aero · 2 wording · 2 othershowhide
  • P2 E&O Clarification of Chassis Construction Requirements #32469tyres & wheels
  • P2 Clean up P2 wording #32525wording
  • P2 After Market to Aftermarket #32373other
  • 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
  • P2 Add spec line for Beasley B2 #32147weight
  • P2 E&O Table 1 spec line wing terminology #32148aero
  • P2 E&O class name #32196other
  • STL Single TB Weight Modifiers #31449weight
  • STL Improved Touring Tires #32063tyres & wheels
  • P2 E&O Engine section #31969engine
  • FV Update direct replacement connecting rod information #31843weight
  • P2 E&O letter #31539 – Control Area definition #31783tyres & wheels
  • STL Throttling Device Clarification #31323induction
  • STL Mazda Renesis Restriction #31467induction
  • STL Clarification of 79-85 RX7 Spec line #31621wording
  • FV Formula V Connecting Rod Replacement #31448weight
  • P2 BoP adjustment effective 1-1-22 #31538engine
  • P2 E&O clarification of "Control Area" definition #31539tyres & wheels
Indianapolis Motor Speedway Runoffs 20212021-09-251:51.665Danny 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 Gee1:33.235Tim Day Jr · fastest of 16 · top 5 within 3.3s+1.409s (+1.53%)1:35.322Tim Day Jr · fastest of 10 · top 5 within 4.8s+2.841s (+3.07%)150.3Robert Iversen-27.389squal -18.430s77.7%qual 83.5%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-5.477squal +5.814s95.5%qual 105.2%1:36.395Max Grau · fastest of 28 · top 5 within 0.7s1:36.655Max Grau · fastest of 28 · top 5 within 0.7s146.2Gray Fowler-26.056squal -15.270s78.8%qual 86.3%
23 rule changes (STL: 15, P2: 8)5 engine · 3 induction · 2 aero · 2 suspension & brakes · 2 tyres & wheels · 2 weight · 1 cars added · 1 wording · 5 othershowhide
  • P2 P2 CN Engine Rebuild Clarification #31000engine
  • STL Request to clean up Spec MX-5 Redundancy #31069other
  • P2 F5 P2 Conversion #30856other
  • P2 Clarify minimum body width requirement #30859tyres & wheels
  • STL VW Engine Request #30625engine
  • P2 E&O tonneau cover provision in cockpit opening section #30459other
  • P2 Remove effective dates in Table 1 #30468other
  • P2 E&O Maximum Valves Per Cylinder #30560engine
  • STL Solstice Ride Height #30183suspension & brakes
  • STL Request Mazda B5 DOHC #30420cars added
  • STL Honda B16A (JDM) Restrictor change #30531induction
  • STL ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • P2 Add a new spec line for a 2-cycle, 3-cylinder engine up to 820cc #30272engine
  • 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
  • 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
  • P2 Balance of Performance adjustments effective 01-01-2021 #29822induction
  • STL Request clarification on wing measurement #29640aero
Road America Runoffs 20202020-10-022:31.420Danny Steyn · fastest of 33 · top 5 within 3.1s2:32.115Joe Moser · fastest of 30 · top 5 within 1.5s132.9Darin Treakle2:08.514Robert Iversen · fastest of 12 · top 5 within 3.0s2:09.793Robert Iversen · fastest of 12 · top 5 within 3.9s153.1Robert Iversen-22.322squal -22.906s85.3%qual 84.9%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+13.701squal +12.574s109.0%qual 108.3%2:12.806Scott Rettich · fastest of 25 · top 5 within 0.6s2:13.271Owen McAllister · fastest of 23 · top 5 within 0.7s143.4Owen McAllister-18.844squal -18.614s87.6%qual 87.7%
25 rule changes (STL: 11, P2: 6, FV: 6, FE2: 2)7 tyres & wheels · 6 induction · 4 engine · 2 aero · 2 cars added · 2 weight · 2 wordingshowhide
  • FE2 FE/FE2 Oil Cooler #29293wording
  • P2 E&O clarification of P2 rear wing requirements #29205aero
  • STL Minimum Weight Determination #27695weight
  • STL ST Gurney flap Wicker clarification #29012aero
  • FV Support for Recommended Item - 4 bolt wheels in FV #29084tyres & wheels
  • FV Support for 4-bolt pattern wheels #28955 #29118tyres & wheels
  • STL Request for Addition to GT3 Approved Turbo List #27576induction
  • P2 Classify Elan NP01 in P2 Table 1 #28812cars added
  • 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
  • P2 SCCA Enterprises ESR / P2 engine restrictor testing #28669induction
  • STL STL Honda B18 restrictor changes #28794induction
  • P2 Add ESR inlet restrictor #27869induction
  • 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
  • FV Update rain tire designation #28444tyres & wheels
  • P2 Request for Fly by Wire Rule Wording Change #28247engine
  • STL Request to add wheel part numbers #28342tyres & wheels
  • 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
  • P2 Request for addition of BMW Engine in P2 Engine Table #27821engine
  • FE2 FE / FE2 Update Rules #27624weight
  • FV Clarification on Wheel Bolt Pattern #27603tyres & wheels
Virginia International Raceway Runoffs 20192019-10-052:07.203Danny Steyn · fastest of 36 · top 5 within 1.8s2:07.273Cliff Ira · fastest of 35 · top 5 within 1.4s134.8Cliff Ira1:49.111Robert Iversen · fastest of 14 · top 5 within 0.8s1:50.258Greg Gyann · fastest of 13 · top 5 within 0.4s149.4Robert Iversen-17.015squal -18.092s86.6%qual 85.8%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+11.016squal +8.509s108.7%qual 106.7%1:51.062Liam Snyder · fastest of 20 · top 5 within 1.3s1:52.154Liam Snyder · fastest of 19 · top 5 within 0.7s142.6Robert Vanman-15.119squal -16.141s88.1%qual 87.3%
26 rule changes (STL: 11, P2: 9, FV: 6)6 weight · 5 engine · 5 induction · 3 suspension & brakes · 2 tyres & wheels · 1 cars added · 1 wording · 3 othershowhide
  • FV Allowed Modifications E&O #27398other
  • P2 Update Engine Table Line E notes #27414engine
  • STL Request to Classify Spec MX-5 Challenge in STL #27399cars added
  • FV E&O Wheels #27230tyres & wheels
  • P2 Update P2 Engine Table spec lines to reflect 3/1/2019 #27254engine
  • P2 E&O Transmissions #27006tyres & wheels
  • STL Request clarification for manifold and throttle in STU #27004induction
  • P2 Request to restrict all cars #26246weight
  • FV Exhaust termination rule E&O #26702other
  • STL Request Restrictor Plate correction #26779induction
  • FV E&O Dimensions #26674other
  • STL Request Ride Height Clarification #26597suspension & brakes
  • FV Request to clarify Disc Brake rules bearing retainer & weights #26262suspension & brakes
  • P2 Change Engine Table Lines B.1 & B.5 #25777engine
  • P2 Change Line A.1 restrictor size #26429induction
  • 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
  • FV FV Intake Manifold Clarification #26008induction
  • P2 Request to Allow 1345cc Hayabusa Engines for Spec Line P2 Cars #25595engine
  • P2 Change CN inlet restrictor implementation date #25816induction
  • P2 Clarify Honda K20A-FD2 parts requirement #25950weight
  • 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 20182018-10-101:49.138Danny Steyn · fastest of 19 · top 5 within 2.5s1:49.754Danny Steyn · fastest of 17 · top 5 within 2.5s103.2Craig McHaffie1:28.784Tim Day Jr · fastest of 17 · top 5 within 5.0s1:32.071Chuck Bona · fastest of 18 · top 5 within 0.9s144.4Tim Day Jr-17.683squal -20.354s83.9%qual 81.4%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+3.885squal +3.499s103.5%qual 103.2%1:35.040Flinn Lazier · fastest of 9 · top 5 within 1.5s1:35.563Flinn Lazier · fastest of 9 · top 5 within 1.7s126.8Scott Rettich-14.191squal -14.098s87.1%qual 87.1%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:52.647Adam Roberts · fastest of 57 · top 5 within 0.8s1:52.589Eric Kutil · fastest of 50 · top 5 within 1.2s1:31.826Jeff Shafer · fastest of 26 · top 5 within 4.9s1:32.481Jeff Shafer · fastest of 24 · top 5 within 3.8s-20.108squal -20.821s82.1%qual 81.5%1:55.759Michael Varacins · fastest of 39 · top 5 within 1.0s1:55.923Michael Varacins · fastest of 32 · top 5 within 1.3s+3.334squal +3.112s103.0%qual 102.8%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:35.439John Schmitt · fastest of 34 · top 5 within 1.5s1:36.625Kevin Boehm · fastest of 31 · top 5 within 0.6s1:20.188Jeff Shafer · fastest of 18 · top 5 within 4.0s1:20.904Jeff Shafer · fastest of 16 · top 5 within 2.2s-15.721squal -15.251s83.7%qual 84.0%1:37.942Alex Scaler · fastest of 41 · top 5 within 0.3s1:38.066Flinn Lazier · fastest of 38 · top 5 within 0.7s+1.441squal +2.503s101.5%qual 102.6%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:09.672Kevin Boehm · fastest of 37 · top 5 within 2.5s2:10.269Kevin Boehm · fastest of 37 · top 5 within 2.1s1:51.825Chris Farrell · fastest of 17 · top 5 within 3.6s1:52.355Jeff Shafer · fastest of 17 · top 5 within 2.8s-17.914squal -17.847s86.2%qual 86.2%2:21.167Roger Siebenaler · fastest of 31 · top 5 within 0.8s2:21.142Andrew Whitston · fastest of 30 · top 5 within 1.1s+10.873squal +11.495s108.3%qual 108.9%

By track

TrackEvents Typical % of STL 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 STL'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.