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BoP Lab / Classes / STL

STL vs FF vs FM 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×vsFF×vsFM×FPFVFXGT1GT2GTXHPPP2SMSMXSRF3STL×STUT1T2T3T4Show 50 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 · FF 92.8% of STL Jonathon Kotyk, Indianapolis Motor Speedway Runoffs 2017 race · FM 89.2% of STL Bryce Cornet, Sonoma Raceway Runoffs 2018 race · FE2 78.8% of STL Max Grau, Indianapolis Motor Speedway Runoffs 2021 race

1:402:002:2014 rule changes between Runoffs 2018 and Runoffs 201914 ▾17 rule changes between Runoffs 2019 and Runoffs 202017 ▾18 rule changes between Runoffs 2020 and Runoffs 202118 ▾5 rule changes between Runoffs 2021 and Runoffs 20225 ▾3 rule changes between Runoffs 2022 and Runoffs 20233 ▾6 rule changes between Runoffs 2023 and Runoffs 20246 ▾8 rule changes between Runoffs 2024 and Runoffs 20258 ▾7 rule changes between Runoffs 2025 and Runoffs 20267 ▾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)FF race best at Runoffs 2015: 2:03.383 (Rick Payne)FF race best at Runoffs 2016: 1:30.133 (Neil Verhagen)FF race best at Runoffs 2017: 1:44.524 (Jonathon Kotyk)FF race best at Runoffs 2018: 1:42.049 (Jonathon Kotyk)FF race best at Runoffs 2019: 2:20.474 (Jonathan Kotyk)FF race best at Runoffs 2020: 2:24.268 (Jeffrey Bartz)FF race best at Runoffs 2021: 1:55.676 (Jonathan Kotyk)FF race best at Runoffs 2022: 2:18.358 (Jonathan Kotyk)FF race best at Runoffs 2023: 2:00.583 (Jonathan Kotyk)FF race best at Runoffs 2024: 2:22.057 (Sebastian Mateo Naranjo)FF race best at Runoffs 2025: 2:25.541 (Calvin Kautz)FF race best at Runoffs 2026: 2:23.686 (Nathan Down)FF qualifying best at Runoffs 2015: 2:02.489 (Tim Kautz)FF qualifying best at Runoffs 2016: 1:29.213 (Neil Verhagen)FF qualifying best at Runoffs 2017: 1:44.601 (Zach Holden)FF qualifying best at Runoffs 2018: 1:41.612 (Jonathon Kotyk)FF qualifying best at Runoffs 2019: 1:59.563 (Tyler O'Connor)FF qualifying best at Runoffs 2020: 2:22.916 (Simon Sikes)FF qualifying best at Runoffs 2021: 1:44.359 (Jonathan Kotyk)FF qualifying best at Runoffs 2022: 1:59.215 (Jonathan Kotyk)FF qualifying best at Runoffs 2023: 1:59.249 (Nolan Allaer)FF qualifying best at Runoffs 2024: 2:22.552 (Calvin Kautz)FF qualifying best at Runoffs 2025: 2:24.905 (Jonathan Kotyk)FF qualifying best at Runoffs 2026: 2:23.047 (David Ybarra)FM race best at Runoffs 2015: 1:58.029 (Joseph Burton-Harris)FM race best at Runoffs 2016: 1:27.922 (Jacob Loomis)FM race best at Runoffs 2017: 1:41.146 (Jarret Voorhies)FM race best at Runoffs 2018: 1:37.909 (Bryce Cornet)FM race best at Runoffs 2019: 2:15.816 (Bryce Cornet)FM qualifying best at Runoffs 2015: 1:57.804 (Joseph Burton-Harris)FM qualifying best at Runoffs 2016: 1:26.043 (Jacob Loomis)FM qualifying best at Runoffs 2017: 1:41.231 (Jarret Voorhies)FM qualifying best at Runoffs 2018: 1:37.598 (Bryce Cornet)FM qualifying best at Runoffs 2019: 1:55.124 (Bryce Cornet)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
STLFFFMFE2solid race · dashed qualifying · slower is lower
85%90%95%100%105%14 rule changes between Runoffs 2018 and Runoffs 201914 ▾17 rule changes between Runoffs 2019 and Runoffs 202017 ▾18 rule changes between Runoffs 2020 and Runoffs 202118 ▾5 rule changes between Runoffs 2021 and Runoffs 20225 ▾3 rule changes between Runoffs 2022 and Runoffs 20233 ▾6 rule changes between Runoffs 2023 and Runoffs 20246 ▾8 rule changes between Runoffs 2024 and Runoffs 20258 ▾7 rule changes between Runoffs 2025 and Runoffs 20267 ▾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)FF race best at Runoffs 2015: 94.7% of STL's (Rick Payne)FF race best at Runoffs 2016: 93.3% of STL's (Neil Verhagen)FF race best at Runoffs 2017: 92.8% of STL's (Jonathon Kotyk)FF race best at Runoffs 2018: 93.0% of STL's (Jonathon Kotyk)Off the chart: FF race best at Runoffs 2019: 110.4% of STL's (Jonathan Kotyk)FF race best at Runoffs 2020: 94.8% of STL's (Jeffrey Bartz)FF race best at Runoffs 2021: 94.3% of STL's (Jonathan Kotyk)FF race best at Runoffs 2022: 108.2% of STL's (Jonathan Kotyk)FF race best at Runoffs 2023: 95.2% of STL's (Jonathan Kotyk)FF race best at Runoffs 2024: 94.6% of STL's (Sebastian Mateo Naranjo)FF race best at Runoffs 2025: 95.7% of STL's (Calvin Kautz)FF race best at Runoffs 2026: 95.4% of STL's (Nathan Down)FF qualifying best at Runoffs 2015: 94.5% of STL's (Tim Kautz)FF qualifying best at Runoffs 2016: 93.5% of STL's (Neil Verhagen)FF qualifying best at Runoffs 2017: 92.9% of STL's (Zach Holden)FF qualifying best at Runoffs 2018: 93.1% of STL's (Jonathon Kotyk)FF qualifying best at Runoffs 2019: 94.0% of STL's (Tyler O'Connor)FF qualifying best at Runoffs 2020: 94.4% of STL's (Simon Sikes)FF qualifying best at Runoffs 2021: 93.5% of STL's (Jonathan Kotyk)FF qualifying best at Runoffs 2022: 95.0% of STL's (Jonathan Kotyk)FF qualifying best at Runoffs 2023: 94.8% of STL's (Nolan Allaer)FF qualifying best at Runoffs 2024: 95.0% of STL's (Calvin Kautz)FF qualifying best at Runoffs 2025: 95.3% of STL's (Jonathan Kotyk)FF qualifying best at Runoffs 2026: 95.0% of STL's (David Ybarra)FM race best at Runoffs 2015: 90.6% of STL's (Joseph Burton-Harris)FM race best at Runoffs 2016: 91.0% of STL's (Jacob Loomis)FM race best at Runoffs 2017: 89.8% of STL's (Jarret Voorhies)FM race best at Runoffs 2018: 89.2% of STL's (Bryce Cornet)FM race best at Runoffs 2019: 106.7% of STL's (Bryce Cornet)FM qualifying best at Runoffs 2015: 90.8% of STL's (Joseph Burton-Harris)FM qualifying best at Runoffs 2016: 90.2% of STL's (Jacob Loomis)FM qualifying best at Runoffs 2017: 89.9% of STL's (Jarret Voorhies)FM qualifying best at Runoffs 2018: 89.4% of STL's (Bryce Cornet)FM qualifying best at Runoffs 2019: 90.5% of STL's (Bryce Cornet)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)Off the chart: 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
STLFFFMFE2solid 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
EventSTLFFFMFE2
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%)2:23.047David Ybarra · fastest of 20 · top 5 within 1.4s-1.858s (-1.28%)2:23.686Nathan Down · fastest of 20 · top 5 within 1.6s-1.855s (-1.27%)138.9Tazio Stefanelli+0.5 mph (+0.3%)-6.971squal -7.490s95.4%qual 95.0%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%
7 rule changes (STL: 4, FF: 2, FE2: 1)3 weight · 1 engine · 1 removed · 1 tyres & wheels · 1 othershowhide
  • FF Clarification in FF Kent 1600 Compression Ratio Paragraph #40293engine
  • STL Spec Line Clean Up #40344removed
  • STL Calculating Weight #40224weight
  • STL Classifications #39885weight
  • FF Formula F Alternative Tire Rule Proposed Clarifications #39281tyres & wheels
  • 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%)2:24.905Jonathan Kotyk · fastest of 17 · top 5 within 1.1s+2.353s (+1.65%)2:25.541Calvin Kautz · fastest of 16 · top 5 within 0.5s+3.484s (+2.45%)138.4Tazio Stefanelli-2.3 mph (-1.6%)-6.586squal -7.160s95.7%qual 95.3%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%
8 rule changes (STL: 3, FF: 4, FE2: 1)4 weight · 3 tyres & wheels · 1 othershowhide
  • STL Lotus Weight Reduction #38772weight -50 lbs
  • FF Page 228, FF tire rule 9.1.1.10.e #38251tyres & wheels
  • STL E&O: SMX Allowance in STL #37945weight
  • FE2 Driver Safety & Comfort #37965other
  • FF Formula F Proposal to Invite Older Cars Via a Tire Rule Change #37802tyres & wheels
  • STL Request to Remove Miata Hubs from General category #37138tyres & wheels
  • FF Change FF/FC Weight with Sequential Gearbox #36651weight
  • FF Alternative Oversize Honda Fit Pistons #37064weight
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%)2:22.552Calvin Kautz · fastest of 13 · top 5 within 1.1s-0.364s (-0.25%)2:22.057Sebastian Mateo Naranjo · fastest of 13 · top 5 within 0.6s-2.211s (-1.53%)140.7Calvin Kautz+2.6 mph (+1.9%)-8.188squal -7.511s94.6%qual 95.0%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%
6 rule changes (STL: 4, FF: 2)2 induction · 1 engine · 1 weight · 2 othershowhide
  • FF Update to FF EGR Blanking Plate Rule #36633engine
  • STL ST Electric-Assisted Steering Systems #35066other
  • STL BOP Adjustments #35112weight
  • STL Mazda 12A #35320induction
  • FF Honda Fit Oversize Piston Rings #35305other
  • STL Alternate Carburetor Request for 79-85 RX7 12a #35181induction
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%)1:59.249Nolan Allaer · fastest of 8 · top 5 within 2.8s+0.034s (+0.03%)2:00.583Jonathan Kotyk · fastest of 8 · top 5 within 0.4s-17.775s (-12.85%)138.4Calvin Kautz+0.1 mph (+0.1%)-6.099squal -6.530s95.2%qual 94.8%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%
3 rule changes (STL: 2, FF: 1)2 tyres & wheels · 1 engineshowhide
  • STL Clarify STL table B - IT spec notes on Tires #34187tyres & wheels
  • FF Add Fast Forward Part Numbers for Honda Fit Engine #33752engine
  • 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%)1:59.215Jonathan Kotyk · fastest of 13 · top 5 within 1.2s-0.348s (-0.29%)2:18.358Jonathan Kotyk · fastest of 12 · top 5 within 2.4s-2.116s (-1.51%)138.3Tim Kautz+2.2 mph (+1.6%)+10.526squal -6.259s108.2%qual 95.0%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%
5 rule changes (STL: 5)2 induction · 1 tyres & wheels · 1 weight · 1 wordingshowhide
  • STL Single TB Weight Modifiers #31449weight
  • STL Improved Touring Tires #32063tyres & wheels
  • STL Throttling Device Clarification #31323induction
  • STL Mazda Renesis Restriction #31467induction
  • STL Clarification of 79-85 RX7 Spec line #31621wording
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 Gee1:44.359Jonathan Kotyk · fastest of 24 · top 5 within 1.1s-0.242s (-0.23%)1:55.676Jonathan Kotyk · fastest of 23 · top 5 within 1.8s+11.152s (+10.67%)141.6Nicholas Sheppard-7.035squal -7.306s94.3%qual 93.5%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%
18 rule changes (STL: 15, FF: 3)4 engine · 2 aero · 2 induction · 2 suspension & brakes · 2 weight · 1 cars added · 1 tyres & wheels · 2 wording · 2 othershowhide
  • STL Request to clean up Spec MX-5 Redundancy #31069other
  • 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
  • FF Kent crankshaft clarification #30426wording
  • STL ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • 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
  • FF Allow Optional Coolant Bleed Line to Correct a Known Problem #29673engine
  • FF Clarification regarding Honda LC1 ECU implementation date #29684engine
  • 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 Treakle2:22.916Simon Sikes · fastest of 14 · top 5 within 1.6s2:24.268Jeffrey Bartz · fastest of 14 · top 5 within 0.4s138.1Jeffrey Bartz-7.847squal -8.504s94.8%qual 94.4%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%
17 rule changes (STL: 11, FF: 4, FE2: 2)5 engine · 4 induction · 2 tyres & wheels · 2 weight · 1 aero · 1 cars added · 2 wordingshowhide
  • FE2 FE/FE2 Oil Cooler #29293wording
  • FF Clarification regarding Honda LC1 ECU implementation #29135engine
  • STL Minimum Weight Determination #27695weight
  • STL ST Gurney flap Wicker clarification #29012aero
  • 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
  • STL STL Honda B18 restrictor changes #28794induction
  • FF E&O FF Kent Engine alternator language #28204engine
  • 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
  • FF Honda Racing HPD low cost ECU proposal #27563engine
  • FF Update rain tire designation #28443tyres & wheels
  • STL Request to add wheel part numbers #28342tyres & wheels
  • FE2 FE / FE2 Update Rules #27624weight
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 Ira1:59.563Tyler O'Connor · fastest of 14 · top 5 within 1.4s2:20.474Jonathan Kotyk · fastest of 14 · top 5 within 6.3s136.2Derek Ketchie+13.201squal -7.640s110.4%qual 94.0%1:55.124Bryce Cornet · fastest of 8 · top 5 within 2.3s2:15.816Bryce Cornet · fastest of 8 · top 5 within 4.9s135.7Bryce Cornet+8.543squal -12.079s106.7%qual 90.5%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%
14 rule changes (STL: 11, FF: 3)4 weight · 3 engine · 3 induction · 2 suspension & brakes · 1 cars added · 1 wordingshowhide
  • STL Request to Classify Spec MX-5 Challenge in STL #27399cars added
  • STL Request clarification for manifold and throttle in STU #27004induction
  • STL Request Restrictor Plate correction #26779induction
  • STL Request Ride Height Clarification #26597suspension & brakes
  • 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
  • FF Request for Oversize Honda Fit Pistons #25810engine
  • FF Heat Shield - Fit Intake #26102induction
  • FF Request catch cans/tanks clarification #26158engine
  • 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 McHaffie1:41.612Jonathon Kotyk · fastest of 22 · top 5 within 1.7s1:42.049Jonathon Kotyk · fastest of 22 · top 5 within 1.3s115.7Denny Renfrow-7.705squal -7.526s93.0%qual 93.1%1:37.598Bryce Cornet · fastest of 13 · top 5 within 0.9s1:37.909Bryce Cornet · fastest of 12 · top 5 within 1.3s124.1Melvin David Kemper Jr-11.845squal -11.540s89.2%qual 89.4%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 1.2s1:44.601Zach Holden · fastest of 36 · top 5 within 1.2s1:44.524Jonathon Kotyk · fastest of 36 · top 5 within 0.5s-8.065squal -8.046s92.8%qual 92.9%1:41.231Jarret Voorhies · fastest of 16 · top 5 within 1.7s1:41.146Jarret Voorhies · fastest of 16 · top 5 within 1.2s-11.443squal -11.416s89.8%qual 89.9%
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 0.6s1:29.213Neil Verhagen · fastest of 14 · top 5 within 2.1s1:30.133Neil Verhagen · fastest of 14 · top 5 within 1.4s-6.492squal -6.226s93.3%qual 93.5%1:26.043Jacob Loomis · fastest of 8 · top 5 within 3.1s1:27.922Jacob Loomis · fastest of 8 · top 5 within 2.7s-8.703squal -9.396s91.0%qual 90.2%
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 2.1s2:02.489Tim Kautz · fastest of 25 · top 5 within 1.1s2:03.383Rick Payne · fastest of 22 · top 5 within 0.8s-6.886squal -7.183s94.7%qual 94.5%1:57.804Joseph Burton-Harris · fastest of 10 · top 5 within 2.3s1:58.029Joseph Burton-Harris · fastest of 10 · top 5 within 1.7s-12.240squal -11.868s90.6%qual 90.8%

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.