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BoP Lab / Classes / SRF3

SRF3 vs FB vs SM vs EP 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-SpecvsEP×FAvsFB×FCFE2FFFPFVFXGT1GT2GTXHPPP2vsSM×SMXSRF3×STLSTUT1T2T3T4Show 50 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 · SM 97.9% of SRF3 Travis Wiley, Virginia International Raceway Runoffs 2022 race · EP 96.1% of SRF3 Kip Van Steenburg, Daytona International Speedway Runoffs 2015 race

1:201:402:002:202:4017 rule changes between Runoffs 2018 and Runoffs 201917 ▾23 rule changes between Runoffs 2019 and Runoffs 202023 ▾21 rule changes between Runoffs 2020 and Runoffs 202121 ▾25 rule changes between Runoffs 2021 and Runoffs 202225 ▾18 rule changes between Runoffs 2022 and Runoffs 202318 ▾28 rule changes between Runoffs 2023 and Runoffs 202428 ▾21 rule changes between Runoffs 2024 and Runoffs 202521 ▾25 rule changes between Runoffs 2025 and Runoffs 202625 ▾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)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)EP race best at Runoffs 2015: 2:05.109 (Kip Van Steenburg)EP race best at Runoffs 2016: 1:34.266 (Michael Galati)EP race best at Runoffs 2017: 1:50.396 (Matt Reynolds)EP race best at Runoffs 2018: 1:46.518 (Glen McCready)EP race best at Runoffs 2019: 2:01.631 (Jesse Prather)EP race best at Runoffs 2020: 2:29.047 (Jesse Prather)EP race best at Runoffs 2021: 1:49.928 (Jesse Prather)EP race best at Runoffs 2022: 2:30.855 (Jesse Prather)EP race best at Runoffs 2023: 2:04.050 (Greg Ira)EP race best at Runoffs 2024: 2:27.869 (Tyler Ladd)EP race best at Runoffs 2025: 2:28.756 (Tyler Ladd)EP race best at Runoffs 2026: 2:27.869 (Jon Brakke)EP qualifying best at Runoffs 2015: 2:03.794 (Kip Van Steenburg)EP qualifying best at Runoffs 2016: 1:33.847 (Michael Galati)EP qualifying best at Runoffs 2017: 1:49.597 (Matt Reynolds)EP qualifying best at Runoffs 2018: 1:45.828 (Glen McCready)EP qualifying best at Runoffs 2019: 2:00.987 (Jesse Prather)EP qualifying best at Runoffs 2020: 2:27.322 (Jesse Prather)EP qualifying best at Runoffs 2021: 1:48.181 (Jesse Prather)EP qualifying best at Runoffs 2022: 2:02.326 (Jesse Prather)EP qualifying best at Runoffs 2023: 2:03.215 (John Hainsworth)EP qualifying best at Runoffs 2024: 2:26.803 (Tyler Ladd)EP qualifying best at Runoffs 2025: 2:27.293 (Jon Brakke)EP qualifying best at Runoffs 2026: 2:29.239 (Jon Brakke)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
SRF3FBSMEPsolid race · dashed qualifying · slower is lower
90%100%110%17 rule changes between Runoffs 2018 and Runoffs 201917 ▾23 rule changes between Runoffs 2019 and Runoffs 202023 ▾21 rule changes between Runoffs 2020 and Runoffs 202121 ▾25 rule changes between Runoffs 2021 and Runoffs 202225 ▾18 rule changes between Runoffs 2022 and Runoffs 202318 ▾28 rule changes between Runoffs 2023 and Runoffs 202428 ▾21 rule changes between Runoffs 2024 and Runoffs 202521 ▾25 rule changes between Runoffs 2025 and Runoffs 202625 ▾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)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)EP race best at Runoffs 2015: 96.1% of SRF3's (Kip Van Steenburg)EP race best at Runoffs 2016: 99.3% of SRF3's (Michael Galati)EP race best at Runoffs 2017: 100.6% of SRF3's (Matt Reynolds)EP race best at Runoffs 2018: 99.5% of SRF3's (Glen McCready)EP race best at Runoffs 2019: 97.5% of SRF3's (Jesse Prather)EP race best at Runoffs 2020: 98.7% of SRF3's (Jesse Prather)EP race best at Runoffs 2021: 99.8% of SRF3's (Jesse Prather)EP race best at Runoffs 2022: 106.2% of SRF3's (Jesse Prather)EP race best at Runoffs 2023: 99.3% of SRF3's (Greg Ira)EP race best at Runoffs 2024: 99.8% of SRF3's (Tyler Ladd)EP race best at Runoffs 2025: 99.3% of SRF3's (Tyler Ladd)EP race best at Runoffs 2026: 99.1% of SRF3's (Jon Brakke)EP qualifying best at Runoffs 2015: 96.3% of SRF3's (Kip Van Steenburg)EP qualifying best at Runoffs 2016: 99.5% of SRF3's (Michael Galati)EP qualifying best at Runoffs 2017: 99.8% of SRF3's (Matt Reynolds)EP qualifying best at Runoffs 2018: 99.7% of SRF3's (Glen McCready)EP qualifying best at Runoffs 2019: 97.1% of SRF3's (Jesse Prather)EP qualifying best at Runoffs 2020: 98.4% of SRF3's (Jesse Prather)EP qualifying best at Runoffs 2021: 98.8% of SRF3's (Jesse Prather)EP qualifying best at Runoffs 2022: 98.9% of SRF3's (Jesse Prather)EP qualifying best at Runoffs 2023: 99.5% of SRF3's (John Hainsworth)EP qualifying best at Runoffs 2024: 99.3% of SRF3's (Tyler Ladd)EP qualifying best at Runoffs 2025: 99.4% of SRF3's (Jon Brakke)EP qualifying best at Runoffs 2026: 101.2% of SRF3's (Jon Brakke)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
SRF3FBSMEPsolid 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
EventSRF3FBSMEP
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%2:29.239Jon Brakke · fastest of 15 · top 5 within 5.2s+1.946s (+1.32%)2:27.869Jon Brakke · fastest of 15 · top 5 within 5.2s-0.887s (-0.60%)137.0Jon Brakke-3.8 mph (-2.7%)-1.388squal +1.796s99.1%qual 101.2%
25 rule changes (SRF3: 2, SM: 2, EP: 21)6 weight · 5 induction · 4 engine · 1 suspension & brakes · 1 tyres & wheels · 4 wording · 4 othershowhide
  • EP Mini Cooper Compression Ratio #40517engine
  • EP 1996-2000 Honda Civic (CX, DX, VP, LX) with Engine Code D16Y7 #40322engine
  • EP 1275 Midget/Sprit Alternate intake manifold E/O #40370induction
  • EP HP Honda Civic (92-95) #40464weight -70 lbs
  • SM Rear Toe Link #40271other
  • EP Honda S2000 Hardtop #40138other
  • EP Miata track width - errors and omissions #39976wording
  • EP Triumph GT6 Spec Change. #40098induction
  • SM Part Number Change Request #39914wording
  • SRF3 SRF3 Spark Plugs #39899other
  • EP Request to Update E30 BMW Throttle Body Diameter Verbiage #39363induction
  • EP TR2 Notes E&O #39180weight
  • EP Balance of Power #39187weight +50 lbs
  • EP Please Lower Weight of 280Z #38871weight -160 lbs
  • EP Miata Weight Adjustment Follow Up #38949weight -25 lbs
  • EP Weight Break for 1098 Midget / Sprite #38970weight -80 lbs
  • EP HP Volvo 142 spec omission #38994engine
  • EP HP Mini DOHC 1.6 #38996engine
  • EP Add to Rabbit description #39019wording
  • EP Clean-up 9.1.5.E.7e #39025suspension & brakes
  • EP Add TB size to Ford Mustang (94-98) Spec Line #39130induction
  • EP HP Plymouth Arrow spec omission #38995wording
  • EP Add Wheel Diameter to Appendix G #39008tyres & wheels
  • EP Add TB ID tolerance to general Prod rules #39009induction
  • 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%2:27.293Jon Brakke · fastest of 21 · top 5 within 2.1s+0.490s (+0.33%)2:28.756Tyler Ladd · fastest of 19 · top 5 within 1.9s+0.887s (+0.60%)140.8Jon Brakke+0.1 mph (+0.1%)-1.083squal -0.933s99.3%qual 99.4%
21 rule changes (SRF3: 3, SM: 4, EP: 14)8 weight · 3 induction · 1 cars added · 1 tyres & wheels · 2 wording · 6 othershowhide
  • SRF3 SRF Rule Updates #38853weight
  • EP BMW Z4 update #38490induction
  • EP EP Fiat 124 Spider Competition Adjustment Request #38498weight -50 lbs
  • EP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -50 lbs
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • EP Request for Classification of Chevrolet Spark #37755cars added
  • EP Request to Lower Ford Festiva Minimum Weight to 1600 LBS #37939weight -100 lbs
  • SRF3 Driver Safety & Comfort #37966other
  • SRF3 Update SADEV transmission specs #37992other
  • EP Request Competition Adjustment to BMW Z3 2.5L #37120induction
  • EP Interpretation of Production Rules on Mirrors #37235other
  • EP Weight Reduction for Honda S2000 #37466weight
  • EP Mazda 1999 Miata 1.8L #37488weight -50 lbs
  • EP Effective date for Jan 2025 GCR updates #37654induction
  • EP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbs
  • EP Triumph GT6 Adjustments #37112weight
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • EP 1275 HP Spridget Level 2 Only #36518other
  • EP NA Miata Track Width Correction #36902wording
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%2:26.803Tyler Ladd · fastest of 16 · top 5 within 4.1s-0.519s (-0.35%)2:27.869Tyler Ladd · fastest of 16 · top 5 within 3.6s-1.178s (-0.79%)140.7Bill Miller-1.0 mph (-0.7%)-0.260squal -0.970s99.8%qual 99.3%
28 rule changes (SRF3: 10, SM: 4, EP: 14)9 weight · 4 suspension & brakes · 3 engine · 3 tyres & wheels · 2 cars added · 1 induction · 2 wording · 4 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
  • EP Errant entry in HP production line item #36231other
  • SRF3 Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels
  • EP NIssan 300ZX Z31 to EP #35830cars added
  • EP RX7 1993 and Up Request In EP Spec Lines, classify #36031cars added
  • EP Clean-up Multiple EP RX-8 Spec Lines In EP #36156wording
  • SRF3 SRF3 Alternator Pulley Update In #36095weight
  • EP GCR Correction - Redundant HP Spec Lines #35623engine
  • EP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weight
  • EP Request to Review Z3 2.5 Spec Line #35073weight +50 lbs
  • EP Miata Alternate Head #35253weight -50 lbs
  • EP Triumph GT6 Adjustments #35255weight
  • EP Honda S2000 throttle body #35272induction
  • EP Correction within Triumph TR8 Spec Line #35315engine
  • EP Correction to EP 924S/944 Spec Line #35317weight
  • SRF3 Update SRF Rain / Brake Rule #34706suspension & brakes
  • SRF3 Update SRF Brake Light Rule v1 #34853suspension & brakes
  • SRF3 SRF / SRF3 Rule Updates #35268weight
  • EP Porsche 944/924S Rule Change Request #35002weight
  • EP Triumph GT6 Adjustments #35054weight -30 lbs
  • 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%2:03.215John Hainsworth · fastest of 24 · top 5 within 4.3s+0.889s (+0.73%)2:04.050Greg Ira · fastest of 22 · top 5 within 5.3s-26.805s (-17.77%)144.6Greg Ira+3.1 mph (+2.2%)-0.861squal -0.627s99.3%qual 99.5%
18 rule changes (SRF3: 4, SM: 1, EP: 13)3 engine · 3 induction · 3 suspension & brakes · 3 tyres & wheels · 3 weight · 1 wording · 2 othershowhide
  • EP Hub Note Clean Up In EP TR8 Spec Line #34649wording
  • EP Triumph GT6 Adjustments #34662other
  • EP Triumph GT6 Adjustments: Brakes #34663suspension & brakes
  • EP Correct Intake Valve Size on 1500cc Midget/Spitfire #34419induction
  • EP 914-6 Valve Size Correction #34185engine
  • SRF3 Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • SRF3 Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • EP Investigate Parity of Z3 #33343induction
  • SRF3 Update SRF Brake Rule #33469suspension & brakes
  • SRF3 Update SRF Bodywork Fitment Rule #33765tyres & wheels
  • EP Revise 79-85 RX7 Brake Spec Line Allowance #33293suspension & brakes
  • EP Request alternate carburetors for EP 280z #33405engine
  • EP Fuel Injection 12a Mazda RX3 #33434engine
  • EP Mazda RX3 - Weight Reduction #33436weight -50 lbs
  • EP Request TR8 Dry Sump Allowance #33460other
  • EP Review Limited Prep Port Matching Rules #33600induction
  • EP 280ZX Classification Request #33611weight
  • 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%2:02.326Jesse Prather · fastest of 17 · top 5 within 3.2s+1.339s (+1.11%)2:30.855Jesse Prather · fastest of 15 · top 5 within 2.5s+29.224s (+24.03%)141.5Jesse Prather-6.0 mph (-4.1%)+8.789squal -1.390s106.2%qual 98.9%
25 rule changes (SRF3: 3, SM: 1, EP: 21)6 induction · 4 engine · 4 weight · 3 cars added · 3 tyres & wheels · 2 suspension & brakes · 1 wording · 2 othershowhide
  • EP Request to classify VW New Beetle 2.5L in EP #32725cars added
  • EP Request Rotary Injection on Dual Y manifold #32775engine
  • EP Request for Corrado Stroke & Displacement Correction #32985engine
  • EP Subaru BRZ Model Years #32500other
  • SRF3 SRF Tire Rule Update #32614tyres & wheels
  • SRF3 Brake, seal, and air filter clarifications #32670suspension & brakes
  • EP EP MX-5 Global Cup Car #32218weight
  • EP Please Class BMW 128i in EP #32370cars added
  • EP Inconsistency in Body Work Descriptions #32396other
  • EP Mazda RX8 with 13b Rotary #32170induction
  • EP Request Idle control valve clarification #32178engine
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • EP EP Adjustments #31858induction
  • EP 1999 3.8L Ford Mustang to EP? #31635weight
  • EP Improved Touring Tires #32064tyres & wheels
  • EP Throttle Body and Idle Air #31800induction
  • EP Porsche 968 Engine Questions #31831engine
  • EP Request weight reduction for 1979-1985 Mazda RX-7 #31833weight
  • EP Porsche 968 Engine Questions #31478induction
  • EP PCS E. 2. n. 4. Add Axle Shaft to Allow FWD the Same Freedom #31592tyres & wheels
  • EP BMW Z3 2.5L Spec Line #31724induction
  • EP 944S2 Restrictor #31396induction
  • EP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars added
  • SRF3 Three Updates to SRF Rules #31523weight
  • EP E&O; MR2 Track #31120wording
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%1:48.181Jesse Prather · fastest of 31 · top 5 within 3.2s-1.416s (-1.29%)1:49.928Jesse Prather · fastest of 27 · top 5 within 0.9s-0.468s (-0.42%)143.4Jon Brakke-0.167squal -1.339s99.8%qual 98.8%
21 rule changes (SRF3: 6, SM: 1, EP: 14)6 weight · 4 engine · 3 cars added · 3 suspension & brakes · 1 induction · 1 tyres & wheels · 1 wording · 2 othershowhide
  • EP Request to Allow F22c Engine for 2000-2003 Honda S2000 #30548engine
  • EP Request a review of the S14 240SX in EP. #30873weight -200 lbs
  • SRF3 SRF Wet Tires #30849tyres & wheels
  • SRF3 SADEV-SRF3 Transmission #30926other
  • SRF3 SRF Update Maintenance, Repairs and Seals #30961engine
  • EP Lotus/Caterham 7 America Request #30392engine
  • EP Reclassify Daimler SP 250 #30721cars added
  • EP Clarify Application of Percentage Based Weight Penalties #30669weight
  • SRF3 SRF3 Alternator Pulley #30684weight
  • EP Change Classification of 84-87 Mazda 626 from FP to HP #30350cars added
  • EP Fiat X1/9 brake rotors #30423suspension & brakes
  • EP NC MX-5 year range correction E&O #30503wording
  • EP Please Classify Mazda3 in FP #30165cars added
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • SRF3 Mandatory identification: #30223engine
  • EP Alternate Front Brake Rotors and Calipers for EP AH 3000 #29893suspension & brakes
  • EP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines #29195weight -50 lbs
  • EP Correct Wording for Level 1 and Level 2 Induction Systems #29406induction
  • EP Weight Reduction for Datsun Roadster #29409weight -75 lbs
  • EP EP TR8 Adjustment #29512weight -100 lbs
  • 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%2:27.322Jesse Prather · fastest of 20 · top 5 within 2.5s2:29.047Jesse Prather · fastest of 20 · top 5 within 2.8s141.7Jesse Prather-1.991squal -2.464s98.7%qual 98.4%
23 rule changes (SRF3: 7, SM: 2, EP: 14)6 suspension & brakes · 5 engine · 5 induction · 2 cars added · 2 tyres & wheels · 1 weight · 1 wording · 1 othershowhide
  • EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheels
  • SM Radiator E&O Clarifications #29294engine
  • EP EP BMW Z3 Rule Clarification #28998engine
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • EP Request to Classify Porsche 911 2.0L #28456cars added
  • EP BMW Cylinder Head Casting and Part Numbers #28708engine
  • SRF3 SRF Shocks #28791suspension & brakes
  • EP Request to Classify 1990-1994 Mazda Protege #28381cars added
  • EP Error in Mini Cooper Spec Line #28713wording
  • SRF3 Update Bump Stop Rule #28712suspension & brakes
  • SRF3 SRF Bump Stop Correction #27019suspension & brakes
  • EP Caterham 7 Spec Line #28498engine
  • EP Request to Review Horsepower Parity #27662induction
  • EP E36 (92-95) Brakes Errors and Omissions #28058suspension & brakes
  • EP Request to allow 40 DCOE carb for the Datsun 510 #28195induction
  • EP Add Throttle Body Size these EP BMW Spec Lines #28422induction
  • EP Request for Help for Datsun 1200 #27934induction
  • EP Request to List Mazda Miata Throttle Body Size #27907induction
  • SRF3 SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661engine
  • 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%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%2:00.987Jesse Prather · fastest of 29 · top 5 within 2.2s2:01.631Jesse Prather · fastest of 24 · top 5 within 1.4s147.5Kip Van Steenburg-3.124squal -3.637s97.5%qual 97.1%
17 rule changes (SRF3: 3, SM: 4, EP: 10)2 engine · 2 induction · 2 suspension & brakes · 2 tyres & wheels · 2 weight · 1 cars added · 2 wording · 4 othershowhide
  • EP Request bodywork for Austin Healey Bugeye Sprite MK1 #27106other
  • EP Request to classify the GMX5 2019 #27263cars added
  • EP level one susp. component rule #27270suspension & brakes
  • EP Clarification of Carb Rules - Prep 1 #27300induction
  • EP Clarification of Carb Rules - Prep 2 #27301induction
  • EP Request Miata Eligibility - 2003 #27121other
  • SRF3 SRF Dash Windscreen Kit #27028other
  • SRF3 New SRF Sectional Nose Rule Addition #26914other
  • EP Allow Firewall Modification for Fitment of 13B into RX8 #26726engine
  • SRF3 SRF Brakes and Shock Rule Changes #26629suspension & brakes
  • EP Rollcenter Correction Clarification #25873tyres & wheels
  • EP Hardtops #26476wording
  • EP Request for Competition Adjustment for 2nd Generation RX7 #25935weight -50 lbs
  • 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%1:54.355Ken 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%1:45.828Glen McCready · fastest of 18 · top 5 within 4.3s1:46.518Glen McCready · fastest of 16 · top 5 within 2.8s106.5Aaron Downey-0.535squal -0.289s99.5%qual 99.7%
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%1:58.306Chris 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%1:49.597Matt Reynolds · fastest of 44 · top 5 within 1.2s1:50.396Matt Reynolds · fastest of 45 · top 5 within 0.5s+0.614squal -0.227s100.6%qual 99.8%
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%1:40.514Justin 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%1:33.847Michael Galati · fastest of 25 · top 5 within 0.8s1:34.266Michael Galati · fastest of 23 · top 5 within 1.3s-0.681squal -0.516s99.3%qual 99.5%
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%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%2:03.794Kip Van Steenburg · fastest of 29 · top 5 within 3.2s2:05.109Kip Van Steenburg · fastest of 28 · top 5 within 3.3s-5.106squal -4.763s96.1%qual 96.3%

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.