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BoP Lab / Classes / F5

F5 vs FE vs SRF pace at every track

Lap times across years say as much about the weather as the class. % of F5 is each class's best lap as a share of F5'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)
AS+B-Spec+EP+F5×FA+FC+vsFE×FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+P+P2+SM+SMX+vsSRF×SRF3+STL+STU+T1+T2+T3+T4+Show 48 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: F5 100.0% of F5 Matthew Strand, Daytona International Speedway Runoffs 2015 race · FE 95.8% of F5 Mark Snyder, Sonoma Raceway Runoffs 2018 qualifying · SRF 108.2% of F5 Thomas Kirchman, Indianapolis Motor Speedway Runoffs 2017 qualifying

1:402:002:207 rule changes between Runoffs 2018 and Runoffs 20197 ▾16 rule changes between Runoffs 2019 and Runoffs 202016 ▾13 rule changes between Runoffs 2020 and Runoffs 202113 ▾13 rule changes between Runoffs 2021 and Runoffs 202213 ▾F5 race best at Runoffs 2015: 2:03.298 (Matthew Strand)F5 race best at Runoffs 2016: 1:29.853 (Steven Thompson)F5 race best at Runoffs 2017: 1:42.860 (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 1:42.491 (David Lapham)F5 race best at Runoffs 2019: 1:57.572 (Wiley Mcmahan)F5 race best at Runoffs 2020: 2:21.391 (James Weida)F5 race best at Runoffs 2021: 1:43.140 (Sven de Vries)F5 race best at Runoffs 2022: 2:21.862 (Sven de Vries)F5 qualifying best at Runoffs 2015: 2:01.824 (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 1:28.528 (Calvin Stewart)F5 qualifying best at Runoffs 2017: 1:43.136 (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 1:41.807 (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 1:57.361 (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 2:20.954 (Calvin Stewart)F5 qualifying best at Runoffs 2021: 1:42.619 (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 1:57.689 (James Weida)FE race best at Runoffs 2015: 1:59.040 (Scott Rettich)FE race best at Runoffs 2016: 1:30.563 (Hanna Zellers)FE race best at Runoffs 2017: 1:39.726 (Elliot Finlayson)FE race best at Runoffs 2018: 1:38.504 (Lee Rackley)FE race best at Runoffs 2019: 1:55.648 (Mark Snyder)FE qualifying best at Runoffs 2015: 1:57.824 (Scott Rettich)FE qualifying best at Runoffs 2016: 1:27.636 (Scott Rettich)FE qualifying best at Runoffs 2017: 1:39.177 (Elliot Finlayson)FE qualifying best at Runoffs 2018: 1:37.517 (Mark Snyder)FE qualifying best at Runoffs 2019: 1:54.710 (Mark Snyder)SRF race best at Runoffs 2015: 2:16.700 (Cliff White)SRF race best at Runoffs 2016: 1:37.621 (Todd Harris)SRF race best at Runoffs 2017: 1:53.769 (Todd Harris)SRF qualifying best at Runoffs 2015: 2:14.306 (Cliff White)SRF qualifying best at Runoffs 2016: 1:37.344 (Mike Miserendino)SRF qualifying best at Runoffs 2017: 1:51.573 (Thomas Kirchman)Daytona International Speedway · Runoffs 2015Runoffs2015Mid-Ohio Sports Car Course · Runoffs 2016Runoffs2016Indianapolis Motor Speedway · Runoffs 2017Runoffs2017Sonoma Raceway · Runoffs 2018Runoffs2018Virginia International Raceway · Runoffs 2019Runoffs2019Road America · Runoffs 2020Runoffs2020Indianapolis Motor Speedway · Runoffs 2021Runoffs2021Virginia International Raceway · Runoffs 2022Runoffs2022
F5FESRFsolid race · dashed qualifying · slower is lower
95%100%105%110%7 rule changes between Runoffs 2018 and Runoffs 20197 ▾16 rule changes between Runoffs 2019 and Runoffs 202016 ▾13 rule changes between Runoffs 2020 and Runoffs 202113 ▾13 rule changes between Runoffs 2021 and Runoffs 202213 ▾F5 race best at Runoffs 2015: 100.0% of F5's (Matthew Strand)F5 race best at Runoffs 2016: 100.0% of F5's (Steven Thompson)F5 race best at Runoffs 2017: 100.0% of F5's (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 100.0% of F5's (David Lapham)F5 race best at Runoffs 2019: 100.0% of F5's (Wiley Mcmahan)F5 race best at Runoffs 2020: 100.0% of F5's (James Weida)F5 race best at Runoffs 2021: 100.0% of F5's (Sven de Vries)F5 race best at Runoffs 2022: 100.0% of F5's (Sven de Vries)F5 qualifying best at Runoffs 2015: 100.0% of F5's (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 100.0% of F5's (Calvin Stewart)F5 qualifying best at Runoffs 2017: 100.0% of F5's (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 100.0% of F5's (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 100.0% of F5's (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 100.0% of F5's (Calvin Stewart)F5 qualifying best at Runoffs 2021: 100.0% of F5's (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 100.0% of F5's (James Weida)FE race best at Runoffs 2015: 96.5% of F5's (Scott Rettich)FE race best at Runoffs 2016: 100.8% of F5's (Hanna Zellers)FE race best at Runoffs 2017: 97.0% of F5's (Elliot Finlayson)FE race best at Runoffs 2018: 96.1% of F5's (Lee Rackley)FE race best at Runoffs 2019: 98.4% of F5's (Mark Snyder)FE qualifying best at Runoffs 2015: 96.7% of F5's (Scott Rettich)FE qualifying best at Runoffs 2016: 99.0% of F5's (Scott Rettich)FE qualifying best at Runoffs 2017: 96.2% of F5's (Elliot Finlayson)FE qualifying best at Runoffs 2018: 95.8% of F5's (Mark Snyder)FE qualifying best at Runoffs 2019: 97.7% of F5's (Mark Snyder)SRF race best at Runoffs 2015: 110.9% of F5's (Cliff White)SRF race best at Runoffs 2016: 108.6% of F5's (Todd Harris)SRF race best at Runoffs 2017: 110.6% of F5's (Todd Harris)SRF qualifying best at Runoffs 2015: 110.2% of F5's (Cliff White)SRF qualifying best at Runoffs 2016: 110.0% of F5's (Mike Miserendino)SRF qualifying best at Runoffs 2017: 108.2% of F5's (Thomas Kirchman)Daytona International Speedway · Runoffs 2015Runoffs2015Mid-Ohio Sports Car Course · Runoffs 2016Runoffs2016Indianapolis Motor Speedway · Runoffs 2017Runoffs2017Sonoma Raceway · Runoffs 2018Runoffs2018Virginia International Raceway · Runoffs 2019Runoffs2019Road America · Runoffs 2020Runoffs2020Indianapolis Motor Speedway · Runoffs 2021Runoffs2021Virginia International Raceway · Runoffs 2022Runoffs2022
F5FESRFsolid race · dashed qualifying · each class's best lap as a share of F5's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventF5FESRF
Qual best Race best Trap Qual best Race best Trap vs F5 % of F5 Qual best Race best Trap vs F5 % of F5 
Virginia International Raceway Runoffs 20222022-09-241:57.689James Weida · fastest of 11 · top 5 within 3.9s+0.328s (+0.28%)2:21.862Sven de Vries · fastest of 10 · top 5 within 14.3s+24.290s (+20.66%)142.9Calvin Stewart+0.1 mph (+0.1%)
13 rule changes (F5: 6, FE: 4, SRF: 3)4 engine · 2 induction · 2 tyres & wheels · 1 suspension & brakes · 1 weight · 3 othershowhide
  • F5 Intake Boots Correction #33028induction
  • FE Engine Heat Shield & Insulation #33019engine
  • F5 Ensure availability of ECU for Rotax engines #32695engine
  • F5 Clarify stepped exhaust header references #32743engine
  • F5 593 carb boot availability and oil pump clarification #32527induction
  • FE Update FE/FE2 Tire Rule #32613tyres & wheels
  • FE Master cylinder clarification #32669engine
  • SRF SRF Tire Rule Update #32614tyres & wheels
  • SRF Brake, seal, and air filter clarifications #32670suspension & brakes
  • F5 E&O class name #32194other
  • F5 Data Box Mounting Plate #31638other
  • FE Two FE2 Rule Updates #31524other
  • SRF Three Updates to SRF Rules #31523weight
Indianapolis Motor Speedway Runoffs 20212021-09-251:42.619Ryan Mayfield · fastest of 22 · top 5 within 1.6s-0.517s (-0.50%)1:43.140Sven de Vries · fastest of 20 · top 5 within 1.7s+0.280s (+0.27%)144.4James Weida
13 rule changes (F5: 3, FE: 4, SRF: 6)3 engine · 3 tyres & wheels · 2 suspension & brakes · 1 weight · 2 wording · 2 othershowhide
  • F5 Clarify allowable assisted shifting systems #30871wording
  • F5 Request to correct terminology #30976tyres & wheels
  • SRF SRF Wet Tires #30849tyres & wheels
  • SRF SADEV-SRF3 Transmission #30926other
  • SRF SRF Update Maintenance, Repairs and Seals #30961engine
  • FE FE Tire Rule Changes #30754tyres & wheels
  • FE Radiator Screens Clarification #30792wording
  • F5 Request to Allow Rotax 593 HO Engine #30712engine
  • FE FE Radiator Screens #30575other
  • SRF SRF3 Alternator Pulley #30684weight
  • SRF Mandatory identification: #30223engine
  • FE FE / FE2 Spring Updates #29689suspension & brakes
  • SRF SRF Shocks, Springs and Ride Height. #29688suspension & brakes
Road America Runoffs 20202020-10-022:20.954Calvin Stewart · fastest of 16 · top 5 within 1.8s2:21.391James Weida · fastest of 14 · top 5 within 1.5s143.2Aaron Ellis
16 rule changes (F5: 6, FE: 5, SRF: 5)3 suspension & brakes · 3 weight · 2 aero · 2 engine · 1 induction · 1 tyres & wheels · 4 othershowhide
  • F5 Request to Update Suzuki Engine Years for F500 #29453engine
  • FE FE Gurney Flap Spec Update #29445aero
  • F5 Request for Cockpit Adjustment of External Jetting Devices #28359other
  • F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine
  • F5 Re letter requesting driver adjustable carb mixture #28840other
  • F5 #28359 WDYT Request for Cockpit Adjustment #28875other
  • FE FE Gurney flap wicker clarification #28885aero
  • FE FE spring rule update changed to November 1, 2020 #28814suspension & brakes
  • SRF SRF Bump Stop Correction #27019suspension & brakes
  • F5 Change 600cc restrictor size #27883induction
  • FE Request for FE / FE2 preparation rules update #27722weight
  • SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • FE FE / FE2 Update Rules #27624weight
  • SRF SRF Tire Warmer Rule #27622tyres & wheels
  • SRF SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF SRF / SRF3 Majors & Regional Class Updates #27723other
Virginia International Raceway Runoffs 20192019-10-051:57.361Wiley Mcmahan · fastest of 15 · top 5 within 3.8s1:57.572Wiley Mcmahan · fastest of 15 · top 5 within 4.0s142.8Eric McRee1:54.710Mark Snyder · fastest of 9 · top 5 within 1.3s1:55.648Mark Snyder · fastest of 9 · top 5 within 0.9s135.5James Libecco-1.924squal -2.651s98.4%qual 97.7%
7 rule changes (F5: 1, FE: 5, SRF: 1)3 tyres & wheels · 1 suspension & brakes · 1 weight · 2 othershowhide
  • FE FE Wet Tire E&O #27365tyres & wheels
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbs
  • FE FE Tire Update #27029tyres & wheels
  • SRF SRF Dash Windscreen Kit #27028other
  • FE FE Anti-Roll Bar Clarification #26912suspension & brakes
  • FE FE / FE2 Updated Bubble Tail Rule #26913other
  • FE Request to Update Hoosier Rain Tire Part Number for the FE cars #26235tyres & wheels
Sonoma Raceway Runoffs 20182018-10-101:41.807Jeff Jorgenson · fastest of 5 · top 5 within 6.6s1:42.491David Lapham · fastest of 5 · top 5 within 9.5s113.3David Lapham1:37.517Mark Snyder · fastest of 10 · top 5 within 1.4s1:38.504Lee Rackley · fastest of 10 · top 5 within 0.8s124.7Quinten Nelson-3.987squal -4.290s96.1%qual 95.8%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:43.136Wiley Clinton McMahan · fastest of 38 · top 5 within 1.4s1:42.860Wiley Clinton McMahan · fastest of 37 · top 5 within 1.6s1:39.177Elliot Finlayson · fastest of 35 · top 5 within 1.3s1:39.726Elliot Finlayson · fastest of 35 · top 5 within 0.8s-3.134squal -3.959s97.0%qual 96.2%1:51.573Thomas Kirchman · fastest of 50 · top 5 within 2.8s1:53.769Todd Harris · fastest of 45 · top 5 within 0.2s+10.909squal +8.437s110.6%qual 108.2%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:28.528Calvin Stewart · fastest of 14 · top 5 within 3.9s1:29.853Steven Thompson · fastest of 12 · top 5 within 4.5s1:27.636Scott Rettich · fastest of 9 · top 5 within 1.7s1:30.563Hanna Zellers · fastest of 9 · top 5 within 2.2s+0.710squal -0.892s100.8%qual 99.0%1:37.344Mike Miserendino · fastest of 27 · top 5 within 0.8s1:37.621Todd Harris · fastest of 27 · top 5 within 0.6s+7.768squal +8.816s108.6%qual 110.0%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:01.824W. Clint McMahan · fastest of 16 · top 5 within 3.0s2:03.298Matthew Strand · fastest of 15 · top 5 within 4.9s1:57.824Scott Rettich · fastest of 16 · top 5 within 1.0s1:59.040Scott Rettich · fastest of 16 · top 5 within 1.3s-4.258squal -4.000s96.5%qual 96.7%2:14.306Cliff White · fastest of 39 · top 5 within 1.2s2:16.700Cliff White · fastest of 38 · top 5 within 0.5s+13.402squal +12.482s110.9%qual 110.2%

By track

TrackEvents Typical % of F5 Best Latest 
Indianapolis Motor Speedway2100.0%100.0%Runoffs 2017100.0%Runoffs 2021
Virginia International Raceway2100.0%100.0%Runoffs 2019100.0%Runoffs 2022
Daytona International Speedway1100.0%100.0%Runoffs 2015100.0%Runoffs 2015
Mid-Ohio Sports Car Course1100.0%100.0%Runoffs 2016100.0%Runoffs 2016
Road America1100.0%100.0%Runoffs 2020100.0%Runoffs 2020
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 F5'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.