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BoP Lab / Classes / SRF3

SRF3 vs FB vs FM vs SM pace at every track

Lap times across years say as much about the weather as the class. % of SRF3 is each class's best lap as a share of SRF3'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-SpecEPF600FAvsFB×FCFE2FFvsFM×FPFVFXGT1GT2GTXHPPP2vsSM×SMXSRF3×STLSTUT1T2T3T4Show 180 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: SRF3 100.0% of SRF3 Chad Galloway, Daytona International Speedway Runoffs 2015 race · FB 83.5% of SRF3 J R Osborne, Sonoma Raceway Runoffs 2018 qualifying · FM 90.6% of SRF3 Joseph Burton-Harris, Daytona International Speedway Runoffs 2015 race · SM 97.9% of SRF3 Travis Wiley, Virginia International Raceway Runoffs 2022 race

1:201:402:002:202:407 rule changes between Runoffs 2018 and Runoffs 20197 ▾9 rule changes between Runoffs 2019 and Runoffs 20209 ▾7 rule changes between Runoffs 2020 and Runoffs 20217 ▾4 rule changes between Runoffs 2021 and Runoffs 20224 ▾5 rule changes between Runoffs 2022 and Runoffs 20235 ▾14 rule changes between Runoffs 2023 and Runoffs 202414 ▾7 rule changes between Runoffs 2024 and Runoffs 20257 ▾4 rule changes between Runoffs 2025 and Runoffs 20264 ▾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)FB race best at Runoffs 2015: 1:51.616 (J R Osborne)FB race best at Runoffs 2016: 1:21.015 (Jeremy Hill)FB race best at Runoffs 2017: 1:33.702 (Alex Mayer)FB race best at Runoffs 2018: 1:31.189 (J R Osborne)FB race best at Runoffs 2019: 1:57.688 (Pete Frost)FB qualifying best at Runoffs 2015: 1:50.711 (J R Osborne)FB qualifying best at Runoffs 2016: 1:19.886 (Alex Mayer)FB qualifying best at Runoffs 2017: 1:33.746 (Gary Hickman)FB qualifying best at Runoffs 2018: 1:28.612 (J R Osborne)FB qualifying best at Runoffs 2019: 1:54.469 (Pete Frost)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)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)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
SRF3FBFMSMsolid race · dashed qualifying · slower is lower
90%100%110%7 rule changes between Runoffs 2018 and Runoffs 20197 ▾9 rule changes between Runoffs 2019 and Runoffs 20209 ▾7 rule changes between Runoffs 2020 and Runoffs 20217 ▾4 rule changes between Runoffs 2021 and Runoffs 20224 ▾5 rule changes between Runoffs 2022 and Runoffs 20235 ▾14 rule changes between Runoffs 2023 and Runoffs 202414 ▾7 rule changes between Runoffs 2024 and Runoffs 20257 ▾4 rule changes between Runoffs 2025 and Runoffs 20264 ▾SRF3 race best at Runoffs 2015: 100.0% of SRF3's (Chad Galloway)SRF3 race best at Runoffs 2016: 100.0% of SRF3's (Cliff White)SRF3 race best at Runoffs 2017: 100.0% of SRF3's (Tray Ayres)SRF3 race best at Runoffs 2018: 100.0% of SRF3's (TJ Acker)SRF3 race best at Runoffs 2019: 100.0% of SRF3's (Bobby Sak)SRF3 race best at Runoffs 2020: 100.0% of SRF3's (Justin Hille)SRF3 race best at Runoffs 2021: 100.0% of SRF3's (John Black)SRF3 race best at Runoffs 2022: 100.0% of SRF3's (Franklin Futrelle)SRF3 race best at Runoffs 2023: 100.0% of SRF3's (David Ogburn)SRF3 race best at Runoffs 2024: 100.0% of SRF3's (S Sandy Satullo III)SRF3 race best at Runoffs 2025: 100.0% of SRF3's (Morgan Burkhard)SRF3 race best at Runoffs 2026: 100.0% of SRF3's (Peyton Long)SRF3 qualifying best at Runoffs 2015: 100.0% of SRF3's (Kerry Jacobsen)SRF3 qualifying best at Runoffs 2016: 100.0% of SRF3's (John Black)SRF3 qualifying best at Runoffs 2017: 100.0% of SRF3's (John Black)SRF3 qualifying best at Runoffs 2018: 100.0% of SRF3's (Robeson Clay Russell)SRF3 qualifying best at Runoffs 2019: 100.0% of SRF3's (Brian Schofield)SRF3 qualifying best at Runoffs 2020: 100.0% of SRF3's (TJ Acker)SRF3 qualifying best at Runoffs 2021: 100.0% of SRF3's (Franklin Futrelle)SRF3 qualifying best at Runoffs 2022: 100.0% of SRF3's (Franklin Futrelle)SRF3 qualifying best at Runoffs 2023: 100.0% of SRF3's (Morgan Burkhard)SRF3 qualifying best at Runoffs 2024: 100.0% of SRF3's (Denny Stripling)SRF3 qualifying best at Runoffs 2025: 100.0% of SRF3's (Bobby Sak)SRF3 qualifying best at Runoffs 2026: 100.0% of SRF3's (Tyler Stephens)FB race best at Runoffs 2015: 85.7% of SRF3's (J R Osborne)FB race best at Runoffs 2016: 85.3% of SRF3's (Jeremy Hill)FB race best at Runoffs 2017: 85.4% of SRF3's (Alex Mayer)FB race best at Runoffs 2018: 85.2% of SRF3's (J R Osborne)FB race best at Runoffs 2019: 94.3% of SRF3's (Pete Frost)FB qualifying best at Runoffs 2015: 86.1% of SRF3's (J R Osborne)FB qualifying best at Runoffs 2016: 84.7% of SRF3's (Alex Mayer)FB qualifying best at Runoffs 2017: 85.4% of SRF3's (Gary Hickman)FB qualifying best at Runoffs 2018: 83.5% of SRF3's (J R Osborne)FB qualifying best at Runoffs 2019: 91.9% of SRF3's (Pete Frost)FM race best at Runoffs 2015: 90.6% of SRF3's (Joseph Burton-Harris)FM race best at Runoffs 2016: 92.6% of SRF3's (Jacob Loomis)FM race best at Runoffs 2017: 92.1% of SRF3's (Jarret Voorhies)FM race best at Runoffs 2018: 91.5% of SRF3's (Bryce Cornet)FM race best at Runoffs 2019: 108.9% of SRF3's (Bryce Cornet)FM qualifying best at Runoffs 2015: 91.6% of SRF3's (Joseph Burton-Harris)FM qualifying best at Runoffs 2016: 91.2% of SRF3's (Jacob Loomis)FM qualifying best at Runoffs 2017: 92.2% of SRF3's (Jarret Voorhies)FM qualifying best at Runoffs 2018: 92.0% of SRF3's (Bryce Cornet)FM qualifying best at Runoffs 2019: 92.4% of SRF3's (Bryce Cornet)SM race best at Runoffs 2015: 110.6% of SRF3's (Todd Lamb)SM race best at Runoffs 2016: 106.1% of SRF3's (Michael Carter)SM race best at Runoffs 2017: 108.5% of SRF3's (Michael Gagliardo)SM race best at Runoffs 2018: 107.7% of SRF3's (Michael Carter)SM race best at Runoffs 2019: 109.4% of SRF3's (Elivan Goulart)SM race best at Runoffs 2020: 108.4% of SRF3's (Preston Pardus)SM race best at Runoffs 2021: 107.9% of SRF3's (Brian Henderson)SM race best at Runoffs 2022: 97.9% of SRF3's (Travis Wiley)SM race best at Runoffs 2023: 109.1% of SRF3's (Julian DaCosta)SM race best at Runoffs 2024: 109.0% of SRF3's (Brett Kowalski)SM race best at Runoffs 2025: 109.7% of SRF3's (Kyle Greenhill)SM race best at Runoffs 2026: 109.0% of SRF3's (Francisco Barroso)SM qualifying best at Runoffs 2015: 107.9% of SRF3's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 106.5% of SRF3's (Justin Hille)SM qualifying best at Runoffs 2017: 107.7% of SRF3's (Chris Haldeman)SM qualifying best at Runoffs 2018: 107.8% of SRF3's (Ken Sutherland)SM qualifying best at Runoffs 2019: 108.0% of SRF3's (Todd Buras)SM qualifying best at Runoffs 2020: 108.3% of SRF3's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 107.5% of SRF3's (Brian Henderson)SM qualifying best at Runoffs 2022: 108.8% of SRF3's (Danny Steyn)SM qualifying best at Runoffs 2023: 109.0% of SRF3's (Danny Steyn)SM qualifying best at Runoffs 2024: 109.0% of SRF3's (Ethan Goulart)SM qualifying best at Runoffs 2025: 110.0% of SRF3's (Bobby Gossett)SM qualifying best at Runoffs 2026: 110.0% of SRF3's (Brett Kowalski)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
SRF3FBFMSMsolid race · dashed qualifying · each class's best lap as a share of SRF3's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSRF3FBFMSM
Qual best Race best Trap Qual best Race best Trap vs SRF3 % of SRF3 Qual best Race best Trap vs SRF3 % of SRF3 Qual best Race best Trap vs SRF3 % of SRF3 
Road America Runoffs 20262026-09-282:27.443Tyler 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%)2:42.173Brett 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%)+13.468squal +14.730s109.0%qual 110.0%
4 rule changes (SRF3: 2, SM: 2)1 wording · 3 othershowhide
  • SM Rear Toe Link #40271other
  • SM Part Number Change Request #39914wording
  • SRF3 SRF3 Spark Plugs #39899other
  • SRF3 Add HD Oil Cooler #38979other
Road America Runoffs 20252025-09-292:28.226Bobby 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%)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%)+14.591squal +14.885s109.7%qual 110.0%
7 rule changes (SRF3: 3, SM: 4)1 tyres & wheels · 1 weight · 1 wording · 4 othershowhide
  • SRF3 SRF Rule Updates #38853weight
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • SRF3 Driver Safety & Comfort #37966other
  • SRF3 Update SADEV transmission specs #37992other
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
Road America Runoffs 20242024-10-012:27.773Denny 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%)2:41.106Ethan 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%)+13.357squal +13.333s109.0%qual 109.0%
14 rule changes (SRF3: 10, SM: 4)4 suspension & brakes · 3 tyres & wheels · 2 weight · 1 engine · 1 wording · 3 othershowhide
  • SRF3 Update SRF3 Air Filter Rule #36681other
  • SRF3 Update SRF Brake Rotor Thickness #36687suspension & brakes
  • SRF3 Hoosier Tire Decal Placement #36739tyres & wheels
  • 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
  • SRF3 SRF3 Alternator Pulley Update In #36095weight
  • 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 20232023-09-232:03.842Morgan 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%)2:14.986Danny 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%)+11.318squal +11.144s109.1%qual 109.0%
5 rule changes (SRF3: 4, SM: 1)3 tyres & wheels · 1 suspension & brakes · 1 weightshowhide
  • SRF3 Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • SRF3 Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • SRF3 Update SRF Brake Rule #33469suspension & brakes
  • SRF3 Update SRF Bodywork Fitment Rule #33765tyres & wheels
  • SM BOP for NB1 and NB2 #32309weight
Virginia International Raceway Runoffs 20222022-09-242:03.716Franklin 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%)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%)-2.959squal +10.948s97.9%qual 108.8%
4 rule changes (SRF3: 3, SM: 1)2 suspension & brakes · 1 tyres & wheels · 1 weightshowhide
  • SRF3 SRF Tire Rule Update #32614tyres & wheels
  • SRF3 Brake, seal, and air filter clarifications #32670suspension & brakes
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • SRF3 Three Updates to SRF Rules #31523weight
Indianapolis Motor Speedway Runoffs 20212021-09-251:49.520Franklin 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 Horst1:57.695Brian 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+8.742squal +8.175s107.9%qual 107.5%
7 rule changes (SRF3: 6, SM: 1)2 engine · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 2 othershowhide
  • SRF3 SRF Wet Tires #30849tyres & wheels
  • SRF3 SADEV-SRF3 Transmission #30926other
  • SRF3 SRF Update Maintenance, Repairs and Seals #30961engine
  • SRF3 SRF3 Alternator Pulley #30684weight
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • SRF3 Mandatory identification: #30223engine
  • SRF3 SRF Shocks, Springs and Ride Height. #29688suspension & brakes
Road America Runoffs 20202020-10-022:29.786TJ Acker · fastest of 59 · top 5 within 0.5s2:31.038Justin Hille · fastest of 55 · top 5 within 0.2s131.9Charles Russell Turner2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill+12.710squal +12.423s108.4%qual 108.3%
9 rule changes (SRF3: 7, SM: 2)5 suspension & brakes · 1 engine · 1 tyres & wheels · 1 weight · 1 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • SRF3 SRF Shocks #28791suspension & brakes
  • SRF3 Update Bump Stop Rule #28712suspension & brakes
  • SRF3 SRF Bump Stop Correction #27019suspension & brakes
  • 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
Virginia International Raceway Runoffs 20192019-10-052:04.624Brian Schofield · fastest of 54 · top 5 within 0.6s2:04.755Bobby Sak · fastest of 53 · top 5 within 0.3s132.4Bobby Sak1:54.469Pete Frost · only car1:57.688Pete Frost · only car145.9Pete Frost-7.067squal -10.155s94.3%qual 91.9%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+11.061squal -9.500s108.9%qual 92.4%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+11.704squal +9.928s109.4%qual 108.0%
7 rule changes (SRF3: 3, SM: 4)1 engine · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 1 wording · 2 othershowhide
  • SRF3 SRF Dash Windscreen Kit #27028other
  • SRF3 New SRF Sectional Nose Rule Addition #26914other
  • SRF3 SRF Brakes and Shock Rule Changes #26629suspension & brakes
  • SM Request to allow aftermarket fuel filters. #26370wording
  • 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
Sonoma Raceway Runoffs 20182018-10-101:46.117Robeson Clay Russell · fastest of 36 · top 5 within 0.5s1:47.053TJ Acker · fastest of 35 · top 5 within 0.2s110.2Steve Fogg1:28.612J R Osborne · fastest of 7 · top 5 within 3.3s1:31.189J R Osborne · fastest of 7 · top 5 within 3.7s140.5J R Osborne-15.864squal -17.505s85.2%qual 83.5%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-9.144squal -8.519s91.5%qual 92.0%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+8.225squal +8.238s107.7%qual 107.8%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:49.824John Black · fastest of 101 · top 5 within 0.5s1:49.782Tray Ayres · fastest of 94 · top 5 within 0.4s1:33.746Gary Hickman · fastest of 18 · top 5 within 3.3s1:33.702Alex Mayer · fastest of 17 · top 5 within 3.0s-16.080squal -16.078s85.4%qual 85.4%1:41.231Jarret Voorhies · fastest of 16 · top 5 within 1.7s1:41.146Jarret Voorhies · fastest of 16 · top 5 within 1.2s-8.636squal -8.593s92.1%qual 92.2%1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+9.318squal +8.482s108.5%qual 107.7%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:34.363John Black · fastest of 41 · top 5 within 0.5s1:34.947Cliff White · fastest of 39 · top 5 within 0.3s1:19.886Alex Mayer · fastest of 10 · top 5 within 1.5s1:21.015Jeremy Hill · fastest of 10 · top 5 within 1.2s-13.932squal -14.477s85.3%qual 84.7%1:26.043Jacob Loomis · fastest of 8 · top 5 within 3.1s1:27.922Jacob Loomis · fastest of 8 · top 5 within 2.7s-7.025squal -8.320s92.6%qual 91.2%1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+5.817squal +6.151s106.1%qual 106.5%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:08.557Kerry Jacobsen · fastest of 29 · top 5 within 1.1s2:10.215Chad Galloway · fastest of 29 · top 5 within 0.3s1:50.711J R Osborne · fastest of 20 · top 5 within 1.1s1:51.616J R Osborne · fastest of 19 · top 5 within 2.1s-18.599squal -17.846s85.7%qual 86.1%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-12.186squal -10.753s90.6%qual 91.6%2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+13.852squal +10.104s110.6%qual 107.9%

By track

TrackEvents Typical % of SRF3 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 SRF3'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.