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BoP Lab / Classes / FE

FE vs F5 vs SRF vs SMX pace at every track

Lap times across years say as much about the weather as the class. % of FE is each class's best lap as a share of FE'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)
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: FE 100.0% of FE Scott Rettich, Daytona International Speedway Runoffs 2015 race · F5 99.2% of FE Steven Thompson, Mid-Ohio Sports Car Course Runoffs 2016 race · SRF 107.8% of FE Todd Harris, Mid-Ohio Sports Car Course Runoffs 2016 race

1:402:002:202:407 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 ▾6 rule changes between Runoffs 2022 and Runoffs 20236 ▾19 rule changes between Runoffs 2023 and Runoffs 202419 ▾9 rule changes between Runoffs 2024 and Runoffs 20259 ▾7 rule changes between Runoffs 2025 and Runoffs 20267 ▾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)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)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)SMX race best at Runoffs 2023: 2:12.616 (Noah Harmon)SMX race best at Runoffs 2024: 2:36.278 (Ethan Jacobs)SMX race best at Runoffs 2025: 2:37.091 (Michael Tinis)SMX race best at Runoffs 2026: 2:36.414 (Cam Ebben)SMX qualifying best at Runoffs 2023: 2:11.435 (Nathan Nicholson)SMX qualifying best at Runoffs 2024: 2:35.651 (Ethan Lampe)SMX qualifying best at Runoffs 2025: 2:36.232 (Cam Ebben)SMX qualifying best at Runoffs 2026: 2:36.472 (Skyler Cottrell)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
FEF5SRFSMXsolid race · dashed qualifying · slower is lower
100%105%110%115%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 ▾6 rule changes between Runoffs 2022 and Runoffs 20236 ▾19 rule changes between Runoffs 2023 and Runoffs 202419 ▾9 rule changes between Runoffs 2024 and Runoffs 20259 ▾7 rule changes between Runoffs 2025 and Runoffs 20267 ▾FE race best at Runoffs 2015: 100.0% of FE's (Scott Rettich)FE race best at Runoffs 2016: 100.0% of FE's (Hanna Zellers)FE race best at Runoffs 2017: 100.0% of FE's (Elliot Finlayson)FE race best at Runoffs 2018: 100.0% of FE's (Lee Rackley)FE race best at Runoffs 2019: 100.0% of FE's (Mark Snyder)FE qualifying best at Runoffs 2015: 100.0% of FE's (Scott Rettich)FE qualifying best at Runoffs 2016: 100.0% of FE's (Scott Rettich)FE qualifying best at Runoffs 2017: 100.0% of FE's (Elliot Finlayson)FE qualifying best at Runoffs 2018: 100.0% of FE's (Mark Snyder)FE qualifying best at Runoffs 2019: 100.0% of FE's (Mark Snyder)F5 race best at Runoffs 2015: 103.6% of FE's (Matthew Strand)F5 race best at Runoffs 2016: 99.2% of FE's (Steven Thompson)F5 race best at Runoffs 2017: 103.1% of FE's (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 104.0% of FE's (David Lapham)F5 race best at Runoffs 2019: 101.7% of FE's (Wiley Mcmahan)F5 qualifying best at Runoffs 2015: 103.4% of FE's (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 101.0% of FE's (Calvin Stewart)F5 qualifying best at Runoffs 2017: 104.0% of FE's (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 104.4% of FE's (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 102.3% of FE's (Wiley Mcmahan)SRF race best at Runoffs 2015: 114.8% of FE's (Cliff White)SRF race best at Runoffs 2016: 107.8% of FE's (Todd Harris)SRF race best at Runoffs 2017: 114.1% of FE's (Todd Harris)SRF qualifying best at Runoffs 2015: 114.0% of FE's (Cliff White)SRF qualifying best at Runoffs 2016: 111.1% of FE's (Mike Miserendino)SRF qualifying best at Runoffs 2017: 112.5% of FE's (Thomas Kirchman)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
FEF5SRFSMXsolid race · dashed qualifying · each class's best lap as a share of FE's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventFEF5SRFSMX
Qual best Race best Trap Qual best Race best Trap vs FE % of FE Qual best Race best Trap vs FE % of FE Qual best Race best Trap vs FE % of FE 
Road America Runoffs 20262026-09-282:36.472Skyler Cottrell · fastest of 21 · top 5 within 0.4s+0.240s (+0.15%)2:36.414Cam Ebben · fastest of 21 · top 5 within 1.1s-0.677s (-0.43%)128.4Christian Hoagland-0.6 mph (-0.5%)
7 rule changes (FE: 2, SRF: 3, SMX: 2)1 engine · 1 suspension & brakes · 1 wording · 4 othershowhide
  • SRF GCR Rain/Brake Light Correction #40579suspension & brakes
  • SMX Rear Toe Link #40271other
  • SMX Part Number Change Request #39914wording
  • SRF SRF3 Spark Plugs #39899other
  • FE FE & FE2 Rule Updates #39484engine
  • FE FE & FE2 Bubble Tail #38978other
  • SRF Add HD Oil Cooler #38979other
Road America Runoffs 20252025-09-292:36.232Cam Ebben · fastest of 20 · top 5 within 0.2s+0.581s (+0.37%)2:37.091Michael Tinis · fastest of 19 · top 5 within 0.3s+0.813s (+0.52%)129.1Camden Gruber-0.4 mph (-0.3%)
9 rule changes (FE: 2, SRF: 2, SMX: 5)1 suspension & brakes · 1 tyres & wheels · 1 weight · 1 wording · 5 othershowhide
  • FE FE & FE2 Rule Updates #38901weight
  • SMX SMX Data Submission - Penalties #38248other
  • SMX SMX Penaly Clarification updated language #38337wording
  • SMX Clarify Tire Marking Regs #38004tyres & wheels
  • SMX SMX Data Submission Timeframe #38039other
  • SRF Driver Safety & Comfort #37966other
  • SRF Update SADEV transmission specs #37992other
  • FE Brake Line to A-Arm Covers #37110suspension & brakes
  • SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
Road America Runoffs 20242024-10-012:35.651Ethan Lampe · fastest of 23 · top 5 within 0.7s2:36.278Ethan Jacobs · fastest of 22 · top 5 within 0.7s129.5Michael Borden
19 rule changes (FE: 5, SRF: 10, SMX: 4)5 tyres & wheels · 4 suspension & brakes · 1 engine · 1 weight · 3 wording · 5 othershowhide
  • SRF Update SRF3 Air Filter Rule #36681other
  • SRF Update SRF Brake Rotor Thickness #36687suspension & brakes
  • SRF Hoosier Tire Decal Placement #36739tyres & wheels
  • FE Protest Fee Clarification #36540wording
  • FE Update on Letter 36620 with new Hoosier Contingency Decal Info #36625tyres & wheels
  • SMX SMX Camera Rule Correction #36496wording
  • SMX AIM ECU Protocol #36556engine
  • SMX OE versus OEM Definitons #36608other
  • SMX Shifter Bushing #36611suspension & brakes
  • SRF Protest Fee Clarification #36540wording
  • SRF Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels
  • FE Hoosier Tire Decal Placement #36435tyres & wheels
  • SRF Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels
  • FE Update FE Rain Light Rule #34707other
  • FE FE/FE2 rule update #35269other
  • SRF Update SRF Rain / Brake Rule #34706suspension & brakes
  • SRF Update SRF Brake Light Rule v1 #34853suspension & brakes
  • SRF SRF / SRF3 Rule Updates #35268weight
  • SRF SRF Radiator Rule Update #34805other
Virginia International Raceway Runoffs 20232023-09-232:11.435Nathan Nicholson · fastest of 18 · top 5 within 0.6s2:12.616Noah Harmon · fastest of 16 · top 5 within 0.1s127.8Noah Harmon
6 rule changes (FE: 3, SRF: 3)2 suspension & brakes · 2 tyres & wheels · 1 aero · 1 othershowhide
  • SRF Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • SRF Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • FE Update FE SADEV Transmission Rule #33883other
  • SRF Update SRF Brake Rule #33469suspension & brakes
  • FE Brake bias adjuster clarification #33084suspension & brakes
  • FE FE Front and Rear Wing Update & Clarification #33089aero
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 (FE: 4, F5: 6, 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 (FE: 4, F5: 3, 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 (FE: 5, F5: 6, 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 20192019-10-051:54.710Mark Snyder · fastest of 9 · top 5 within 1.3s1:55.648Mark Snyder · fastest of 9 · top 5 within 0.9s135.5James Libecco1:57.361Wiley Mcmahan · fastest of 15 · top 5 within 3.8s1:57.572Wiley Mcmahan · fastest of 15 · top 5 within 4.0s142.8Eric McRee+1.924squal +2.651s101.7%qual 102.3%
7 rule changes (FE: 5, F5: 1, 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 20182018-10-101:37.517Mark Snyder · fastest of 10 · top 5 within 1.4s1:38.504Lee Rackley · fastest of 10 · top 5 within 0.8s124.7Quinten Nelson1:41.807Jeff Jorgenson · fastest of 5 · top 5 within 6.6s1:42.491David Lapham · fastest of 5 · top 5 within 9.5s113.3David Lapham+3.987squal +4.290s104.0%qual 104.4%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:39.177Elliot Finlayson · fastest of 35 · top 5 within 1.3s1:39.726Elliot Finlayson · fastest of 35 · top 5 within 0.8s1:43.136Wiley Clinton McMahan · fastest of 38 · top 5 within 1.4s1:42.860Wiley Clinton McMahan · fastest of 37 · top 5 within 1.6s+3.134squal +3.959s103.1%qual 104.0%1:51.573Thomas Kirchman · fastest of 50 · top 5 within 2.8s1:53.769Todd Harris · fastest of 45 · top 5 within 0.2s+14.043squal +12.396s114.1%qual 112.5%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:27.636Scott Rettich · fastest of 9 · top 5 within 1.7s1:30.563Hanna Zellers · fastest of 9 · top 5 within 2.2s1:28.528Calvin Stewart · fastest of 14 · top 5 within 3.9s1:29.853Steven Thompson · fastest of 12 · top 5 within 4.5s-0.710squal +0.892s99.2%qual 101.0%1:37.344Mike Miserendino · fastest of 27 · top 5 within 0.8s1:37.621Todd Harris · fastest of 27 · top 5 within 0.6s+7.058squal +9.708s107.8%qual 111.1%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-211:57.824Scott Rettich · fastest of 16 · top 5 within 1.0s1:59.040Scott Rettich · fastest of 16 · top 5 within 1.3s2:01.824W. Clint McMahan · fastest of 16 · top 5 within 3.0s2:03.298Matthew Strand · fastest of 15 · top 5 within 4.9s+4.258squal +4.000s103.6%qual 103.4%2:14.306Cliff White · fastest of 39 · top 5 within 1.2s2:16.700Cliff White · fastest of 38 · top 5 within 0.5s+17.660squal +16.482s114.8%qual 114.0%

By track

TrackEvents Typical % of FE Best Latest 
Road America40 of 4 with FE
Virginia International Raceway3100.0%1 of 3 with FE100.0%Runoffs 2019100.0%Runoffs 2019
Indianapolis Motor Speedway2100.0%1 of 2 with FE100.0%Runoffs 2017100.0%Runoffs 2017
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 FE'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.