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BoP Lab / Classes / SM

SM vs FB vs FM vs FE2 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: remove one to add another)
ASB-SpecEPFAvsFB×FCvsFE2×FFvsFM×FPFVFXGT1GT2GTXHPPP2SM×SMXSRF3STLSTUT1T2T3T4Show 49 inactive classes
Series
Reference class · the yardstick the % column and chart are measured against
Tracks · untick to narrow

Quickest here: SM 1:40.514 Justin Hille, Runoffs 2016 qualifying · FB 1:19.886 Alex Mayer, Runoffs 2016 qualifying · FM 1:26.043 Jacob Loomis, Runoffs 2016 qualifying · FE2 1:35.040 Flinn Lazier, Runoffs 2018 qualifying

1:201:402:002:202:404 rule changes between Runoffs 2018 and Runoffs 20194 ▾4 rule changes between Runoffs 2019 and Runoffs 20204 ▾1 rule change between Runoffs 2020 and Runoffs 20211 ▾1 rule change between Runoffs 2021 and Runoffs 20221 ▾1 rule change between Runoffs 2022 and Runoffs 20231 ▾4 rule changes between Runoffs 2023 and Runoffs 20244 ▾5 rule changes between Runoffs 2024 and Runoffs 20255 ▾3 rule changes between Runoffs 2025 and Runoffs 20263 ▾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)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)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
SMFBFMFE2solid race · dashed qualifying · slower is lower
80%85%90%95%100%4 rule changes between Runoffs 2018 and Runoffs 20194 ▾4 rule changes between Runoffs 2019 and Runoffs 20204 ▾1 rule change between Runoffs 2020 and Runoffs 20211 ▾1 rule change between Runoffs 2021 and Runoffs 20221 ▾1 rule change between Runoffs 2022 and Runoffs 20231 ▾4 rule changes between Runoffs 2023 and Runoffs 20244 ▾5 rule changes between Runoffs 2024 and Runoffs 20255 ▾3 rule changes between Runoffs 2025 and Runoffs 20263 ▾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)FB race best at Runoffs 2015: 77.5% of SM's (J R Osborne)FB race best at Runoffs 2016: 80.4% of SM's (Jeremy Hill)FB race best at Runoffs 2017: 78.7% of SM's (Alex Mayer)FB race best at Runoffs 2018: 79.1% of SM's (J R Osborne)FB race best at Runoffs 2019: 86.2% of SM's (Pete Frost)FB qualifying best at Runoffs 2015: 79.8% of SM's (J R Osborne)FB qualifying best at Runoffs 2016: 79.5% of SM's (Alex Mayer)FB qualifying best at Runoffs 2017: 79.2% of SM's (Gary Hickman)FB qualifying best at Runoffs 2018: 77.5% of SM's (J R Osborne)FB qualifying best at Runoffs 2019: 85.1% of SM's (Pete Frost)FM race best at Runoffs 2015: 81.9% of SM's (Joseph Burton-Harris)FM race best at Runoffs 2016: 87.3% of SM's (Jacob Loomis)FM race best at Runoffs 2017: 84.9% of SM's (Jarret Voorhies)FM race best at Runoffs 2018: 84.9% of SM's (Bryce Cornet)FM race best at Runoffs 2019: 99.5% of SM's (Bryce Cornet)FM qualifying best at Runoffs 2015: 85.0% of SM's (Joseph Burton-Harris)FM qualifying best at Runoffs 2016: 85.6% of SM's (Jacob Loomis)FM qualifying best at Runoffs 2017: 85.6% of SM's (Jarret Voorhies)FM qualifying best at Runoffs 2018: 85.3% of SM's (Bryce Cornet)FM qualifying best at Runoffs 2019: 85.6% of SM's (Bryce Cornet)FE2 race best at Runoffs 2018: 82.9% of SM's (Flinn Lazier)FE2 race best at Runoffs 2019: 82.2% of SM's (Liam Snyder)FE2 race best at Runoffs 2020: 81.4% of SM's (Owen McAllister)FE2 race best at Runoffs 2021: 81.3% of SM's (Max Grau)FE2 race best at Runoffs 2022: 94.9% of SM's (Jason Conzo)FE2 race best at Runoffs 2023: 81.6% of SM's (Franklin Futrelle)FE2 race best at Runoffs 2024: 82.2% of SM's (Porter Aiken)FE2 race best at Runoffs 2025: 81.1% of SM's (Franklin Futrelle)FE2 race best at Runoffs 2026: 81.0% of SM's (Franklin Futrelle)FE2 qualifying best at Runoffs 2018: 83.1% of SM's (Flinn Lazier)FE2 qualifying best at Runoffs 2019: 82.5% of SM's (Liam Snyder)FE2 qualifying best at Runoffs 2020: 81.9% of SM's (Scott Rettich)FE2 qualifying best at Runoffs 2021: 81.9% of SM's (Max Grau)FE2 qualifying best at Runoffs 2022: 82.3% of SM's (Charles Russell Turner)FE2 qualifying best at Runoffs 2023: 82.0% of SM's (Charles Russell Turner)FE2 qualifying best at Runoffs 2024: 81.6% of SM's (Porter Aiken)FE2 qualifying best at Runoffs 2025: 81.2% of SM's (Franklin Futrelle)FE2 qualifying best at Runoffs 2026: 81.6% of SM'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
SMFBFMFE2solid 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
EventSMFBFMFE2
Qual bestRace bestTrapQual bestRace bestTrapvs SM% of SMQual bestRace bestTrapvs SM% of SMQual bestRace bestTrapvs 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%)2:12.326Franklin 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%)-30.844squal -29.847s81.0%qual 81.6%
3 rule changes (SM: 2, FE2: 1)1 cars added · 1 wording · 1 other · SM/SMX Mazda rear toe link part number revised from 0000-04-5361426 to 0000-04-5361. · SM/SMX part number 0000-10-6900 replaced with 0000-06-5016-KT in GCR 9.1.7.C.1.j.1.c. · FE and FE2 Enterprise bubble tail part WM138014 now allowed; FE2 must use this configuration only.showhide
  • SM Rear Toe Link #40271wordingwordingSM/SMX Mazda rear toe link part number revised from 0000-04-5361426 to 0000-04-5361.
  • SM Part Number Change Request #39914otherunclearSM/SMX part number 0000-10-6900 replaced with 0000-06-5016-KT in GCR 9.1.7.C.1.j.1.c.
  • FE2 FE & FE2 Bubble Tail #38978cars addedaddedFE and FE2 Enterprise bubble tail part WM138014 now allowed; FE2 must use this configuration only.
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%)2:12.475Franklin 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%)-31.091squal -30.636s81.1%qual 81.2%
5 rule changes (SM: 4, FE2: 1)3 wording · 2 other · SMX drivers must submit data acquisition files on time or face suspension and $250 fine. · SMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fines, level 2 and 4 may carry $500 fines. · SM tire marking rules clarified: one Hoosier SM 7.5 P205/50/ZR17 set per Super Tour weekend, impound after first dry session, damaged tires may be replaced with used tires only. · FE2 allows pre-approved driver safety and comfort seat and control modifications for drivers with disabilities, per logbook. · SMX OE instrument cluster must stay unmodified and connected; aftermarket dash allowed if wiring only re-routed; alternate gauges now permitted; foot pedal comfort mods allowed without relocation.showhide
  • SM SMX Data Submission - Penalties #38248otheraddedSMX drivers must submit data acquisition files on time or face suspension and $250 fine.
  • SM Committee) SMX Penaly Clarification updated language #38337wordingwordingSMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fines, level 2 and 4 may carry $500 fines.
  • SM Clarify Tire Marking Regs #38005wordingwordingSM tire marking rules clarified: one Hoosier SM 7.5 P205/50/ZR17 set per Super Tour weekend, impound after first dry session, damaged tires may be replaced with used tires only.
  • FE2 Driver Safety & Comfort #37965otheraddedFE2 allows pre-approved driver safety and comfort seat and control modifications for drivers with disabilities, per logbook.
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070wordingwordingSMX OE instrument cluster must stay unmodified and connected; aftermarket dash allowed if wiring only re-routed; alternate gauges now permitted; foot pedal comfort mods allowed without relocation.
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%)2:11.506Porter 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%)-28.738squal -29.600s82.2%qual 81.6%
4 rule changes (SM: 4)1 engine · 2 wording · 1 other · SMX Spec MX-5 camera requirement: non-functioning recorder now will instead of may warrant penalty or disqualification. · SM and SMX must run latest AIM Data Logger Spec MX-5 ECU Protocol, effective 2024-09-01. · SMX Mazda MX-5 OE versus OEM definitions clarified in GCR section 9.1.7.1; wording change only. · SM and SMX now allow an alternate shifter bushing at the bottom of the shift lever.showhide
  • SM SMX Camera Rule Correction #36496wordingwordingSMX Spec MX-5 camera requirement: non-functioning recorder now will instead of may warrant penalty or disqualification.
  • SM Committee) AIM ECU Protocol #36556engineadded · engineSM and SMX must run latest AIM Data Logger Spec MX-5 ECU Protocol, effective 2024-09-01.
  • SM Committee) OE versus OEM Definitons #36608wordingwordingSMX Mazda MX-5 OE versus OEM definitions clarified in GCR section 9.1.7.1; wording change only.
  • SM Committee) Shifter Bushing #36611otheraddedSM and SMX now allow an alternate shifter bushing at the bottom of the shift lever.
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%)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%)-25.131squal -24.321s81.6%qual 82.0%
1 rule change (SM: 1)1 weight · SM Mazda MX-5 Miata 01-05 minimum weight rises to 2450 lbs, or 2465 with alternate bore.showhide
  • SM BOP for NB1 and NB2 #32309weightslower · weightSM Mazda MX-5 Miata 01-05 minimum weight rises to 2450 lbs, or 2465 with alternate bore.
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%)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%)-7.062squal -23.811s94.9%qual 82.3%
1 rule change (SM: 1)1 wording · SM Majors must run authorized Penske shock and mount; Regional competitors not required until further evaluation.showhide
  • SM Update GCR Section 9.1.7.3.A.1. #32217wordingwordingSM Majors must run authorized Penske shock and mount; Regional competitors not required until further evaluation.
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 Greenhill1:36.395Max Grau · fastest of 28 · top 5 within 0.7s1:36.655Max Grau · fastest of 28 · top 5 within 0.7s146.2Gray Fowler-22.182squal -21.300s81.3%qual 81.9%
1 rule change (SM: 1)1 wording · SM adds procedure for CRB-approved obsolete parts and BOP testing in sanctioned events with point forfeiture.showhide
  • SM Updates - Obsolete Parts & BOP Parts #30438wordingaddedSM adds procedure for CRB-approved obsolete parts and BOP testing in sanctioned events with point forfeiture.
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 Greenhill2:12.806Scott Rettich · fastest of 25 · top 5 within 0.6s2:13.271Owen McAllister · fastest of 23 · top 5 within 0.7s143.4Owen McAllister-30.477squal -29.403s81.4%qual 81.9%
4 rule changes (SM: 2, FE2: 2)1 suspension & brakes · 1 weight · 2 wording · SM allows aftermarket radiators in original location with stock OEM cooling fan, and permits 1990-1997 cars to install upper radiator seal NA75-50-OK7A. · FE2 oil cooler rule clarified: Setrab 50-625-7612 or any cooler with max core 13 inches wide by 6.5 inches high allowed. · SM rear brake caliper may use single bracket under upper retaining bolt head to prevent pin failure. · FE minimum weight rises to 1270 lbs; FE2 minimum weight rises to 1270 lbs; new spring options added; tire warmers prohibited.showhide
  • SM Radiator E&O Clarifications #29294wordingwordingSM allows aftermarket radiators in original location with stock OEM cooling fan, and permits 1990-1997 cars to install upper radiator seal NA75-50-OK7A.
  • FE2 FE/FE2 Oil Cooler #29293wordingwordingFE2 oil cooler rule clarified: Setrab 50-625-7612 or any cooler with max core 13 inches wide by 6.5 inches high allowed.
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakessuspension & brakesSM rear brake caliper may use single bracket under upper retaining bolt head to prevent pin failure.
  • FE2 FE / FE2 Update Rules #27624weightslower · weightFE minimum weight rises to 1270 lbs; FE2 minimum weight rises to 1270 lbs; new spring options added; tire warmers prohibited.
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 Drago1:54.469Pete Frost · only car1:57.688Pete Frost · only car145.9Pete Frost-18.771squal -20.083s86.2%qual 85.1%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-0.643squal -19.428s99.5%qual 85.6%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-24.305squal -23.490s82.2%qual 82.5%
4 rule changes (SM: 4)2 wording · 2 other · SM fuel pump and filter now permitted as Mazda or OEM equivalent part. · SM allows factory Mazda ECU and injector harnesses (P/N 0000-10-020E-99, 0000-10-080D-99) on 1999–2000 model year cars, unmodified. · SM electrical rules reorganized and clarified; alternator now externally regulated only by OEM ECU or master kill switch; harness repair by splicing permitted. · SM tire tread protrusion language removed from GCR 9.1.7.C.5.showhide
  • SM Request to allow aftermarket fuel filters. #26370otheraddedSM fuel pump and filter now permitted as Mazda or OEM equivalent part.
  • SM Request 99-00 replacement Wire harnesses #25602otheraddedSM allows factory Mazda ECU and injector harnesses (P/N 0000-10-020E-99, 0000-10-080D-99) on 1999–2000 model year cars, unmodified.
  • SM Organize and Clarify 9.1.7.C.1.o. #25913wordingwordingSM electrical rules reorganized and clarified; alternator now externally regulated only by OEM ECU or master kill switch; harness repair by splicing permitted.
  • SM Strike Tire Tread Language #26123wordingremovedSM tire tread protrusion language removed from GCR 9.1.7.C.5.
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 Steyn1:28.612J 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-24.089squal -25.743s79.1%qual 77.5%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-17.369squal -16.757s84.9%qual 85.3%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-19.715squal -19.315s82.9%qual 83.1%
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 0.6s1:33.746Gary Hickman · fastest of 18 · top 5 within 3.3s1:33.702Alex Mayer · fastest of 17 · top 5 within 3.0s-25.398squal -24.560s78.7%qual 79.2%1:41.231Jarret Voorhies · fastest of 16 · top 5 within 1.7s1:41.146Jarret Voorhies · fastest of 16 · top 5 within 1.2s-17.954squal -17.075s84.9%qual 85.6%
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 0.3s1:19.886Alex Mayer · fastest of 10 · top 5 within 1.5s1:21.015Jeremy Hill · fastest of 10 · top 5 within 1.2s-19.749squal -20.628s80.4%qual 79.5%1:26.043Jacob Loomis · fastest of 8 · top 5 within 3.1s1:27.922Jacob Loomis · fastest of 8 · top 5 within 2.7s-12.842squal -14.471s87.3%qual 85.6%
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 0.8s1:50.711J R Osborne · fastest of 20 · top 5 within 1.1s1:51.616J R Osborne · fastest of 19 · top 5 within 2.1s-32.451squal -27.950s77.5%qual 79.8%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-26.038squal -20.857s81.9%qual 85.0%

By track

TrackEventsTypical % of SMBestLatest
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, the track and its configuration cancel out, so one figure compares across tracks and years where lap times cannot. 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.