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BoP Lab / Classes / FB

FB vs SRF vs FE vs PX pace at every track

Lap times across years say as much about the weather as the class. % of FB is each class's best lap as a share of FB'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-SpecEPFAFB×FCvsFE×FE2FFFPFVFXGT1GT2GTXHPPP2vsPX×SMSMXvsSRF×SRF3STLSTUT1T2T3T4Show 47 inactive classes
Series
Reference class · the yardstick the % column and chart are measured against
Tracks · untick to narrow

Quickest here: FB 1:19.886 Alex Mayer, Runoffs 2016 qualifying · SRF 1:37.344 Mike Miserendino, Runoffs 2016 qualifying · FE 1:27.636 Scott Rettich, Runoffs 2016 qualifying

1:201:402:002:206 rule changes between Runoffs 2018 and Runoffs 20196 ▾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)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)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)Daytona International Speedway · Runoffs 2015Runoffs2015Mid-Ohio Sports Car Course · Runoffs 2016Runoffs2016Indianapolis Motor Speedway · Runoffs 2017Runoffs2017Sonoma Raceway · Runoffs 2018Runoffs2018Virginia International Raceway · Runoffs 2019Runoffs2019
FBSRFFEPXsolid race · dashed qualifying · slower is lower
100%105%110%115%120%6 rule changes between Runoffs 2018 and Runoffs 20196 ▾FB race best at Runoffs 2015: 100.0% of FB's (J R Osborne)FB race best at Runoffs 2016: 100.0% of FB's (Jeremy Hill)FB race best at Runoffs 2017: 100.0% of FB's (Alex Mayer)FB race best at Runoffs 2018: 100.0% of FB's (J R Osborne)FB race best at Runoffs 2019: 100.0% of FB's (Pete Frost)FB qualifying best at Runoffs 2015: 100.0% of FB's (J R Osborne)FB qualifying best at Runoffs 2016: 100.0% of FB's (Alex Mayer)FB qualifying best at Runoffs 2017: 100.0% of FB's (Gary Hickman)FB qualifying best at Runoffs 2018: 100.0% of FB's (J R Osborne)FB qualifying best at Runoffs 2019: 100.0% of FB's (Pete Frost)SRF race best at Runoffs 2015: 122.5% of FB's (Cliff White)SRF race best at Runoffs 2016: 120.5% of FB's (Todd Harris)SRF race best at Runoffs 2017: 121.4% of FB's (Todd Harris)SRF qualifying best at Runoffs 2015: 121.3% of FB's (Cliff White)SRF qualifying best at Runoffs 2016: 121.9% of FB's (Mike Miserendino)SRF qualifying best at Runoffs 2017: 119.0% of FB's (Thomas Kirchman)FE race best at Runoffs 2015: 106.7% of FB's (Scott Rettich)FE race best at Runoffs 2016: 111.8% of FB's (Hanna Zellers)FE race best at Runoffs 2017: 106.4% of FB's (Elliot Finlayson)FE race best at Runoffs 2018: 108.0% of FB's (Lee Rackley)FE race best at Runoffs 2019: 98.3% of FB's (Mark Snyder)FE qualifying best at Runoffs 2015: 106.4% of FB's (Scott Rettich)FE qualifying best at Runoffs 2016: 109.7% of FB's (Scott Rettich)FE qualifying best at Runoffs 2017: 105.8% of FB's (Elliot Finlayson)FE qualifying best at Runoffs 2018: 110.0% of FB's (Mark Snyder)FE qualifying best at Runoffs 2019: 100.2% of FB's (Mark Snyder)Daytona International Speedway · Runoffs 2015Runoffs2015Mid-Ohio Sports Car Course · Runoffs 2016Runoffs2016Indianapolis Motor Speedway · Runoffs 2017Runoffs2017Sonoma Raceway · Runoffs 2018Runoffs2018Virginia International Raceway · Runoffs 2019Runoffs2019
FBSRFFEPXsolid race · dashed qualifying · each class's best lap as a share of FB's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventFBSRFFEPX
Qual bestRace bestTrapQual bestRace bestTrapvs FB% of FBQual bestRace bestTrapvs FB% of FBQual bestRace bestTrapvs FB% of FB
Virginia International Raceway Runoffs 20192019-10-051:54.469Pete Frost · only car1:57.688Pete Frost · only car145.9Pete Frost1:54.710Mark Snyder · fastest of 9 · top 5 within 1.3s1:55.648Mark Snyder · fastest of 9 · top 5 within 0.9s135.5James Libecco-2.040squal +0.241s98.3%qual 100.2%
6 rule changes (SRF: 1, FE: 5)3 tyres & wheels · 2 aero · 1 suspension & brakes · FE Hoosier wet rear tire width increases from 7.5 to 8.0 inches, part number 44196 W3. · FE removes American Racer tires, mandates Hoosier dry tires 22.0 X 8.0-13 and 22.0 X 10.0-13, wet tires 22.0 X 7.5-13 and 22.0 X 9.0-13. · SRF drivers may now use Dash Windscreen Kit P/N 1180103 or P/N 180102. · FE anti-roll bar links may be removed one per end for safety, but bars must stay connected. · FE and FE2 Enterprise bubble tail P/N WM138014 newly allowed for both classes. · FE Hoosier rain tyre part numbers updated: front 44195 W3, rear 44217 W3.showhide
  • FE FE Wet Tire E&O #27365tyres & wheelstyres & wheelsFE Hoosier wet rear tire width increases from 7.5 to 8.0 inches, part number 44196 W3.
  • FE FE Tire Update #27029tyres & wheelstyres & wheelsFE removes American Racer tires, mandates Hoosier dry tires 22.0 X 8.0-13 and 22.0 X 10.0-13, wet tires 22.0 X 7.5-13 and 22.0 X 9.0-13.
  • SRF SRF Dash Windscreen Kit #27028aeroadded · aeroSRF drivers may now use Dash Windscreen Kit P/N 1180103 or P/N 180102.
  • FE FE Anti-Roll Bar Clarification #26912suspension & brakessuspension & brakesFE anti-roll bar links may be removed one per end for safety, but bars must stay connected.
  • FE FE / FE2 Updated Bubble Tail Rule #26913aeroadded · aeroFE and FE2 Enterprise bubble tail P/N WM138014 newly allowed for both classes.
  • FE Request to Update Hoosier Rain Tire Part Number for the FE cars #26235tyres & wheelstyres & wheelsFE Hoosier rain tyre part numbers updated: front 44195 W3, rear 44217 W3.
Sonoma Raceway Runoffs 20182018-10-101:28.612J R Osborne · fastest of 7 · top 5 within 3.3s1:31.189J R Osborne · fastest of 7 · top 5 within 3.7s140.5J R Osborne1:37.517Mark Snyder · fastest of 10 · top 5 within 1.4s1:38.504Lee Rackley · fastest of 10 · top 5 within 0.8s124.7Quinten Nelson+7.315squal +8.905s108.0%qual 110.0%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:33.746Gary Hickman · fastest of 18 · top 5 within 3.3s1:33.702Alex Mayer · fastest of 17 · top 5 within 3.0s1:51.573Thomas Kirchman · fastest of 50 · top 5 within 2.8s1:53.769Todd Harris · fastest of 45 · top 5 within 0.2s+20.067squal +17.827s121.4%qual 119.0%1:39.177Elliot Finlayson · fastest of 35 · top 5 within 1.3s1:39.726Elliot Finlayson · fastest of 35 · top 5 within 0.8s+6.024squal +5.431s106.4%qual 105.8%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:19.886Alex Mayer · fastest of 10 · top 5 within 1.5s1:21.015Jeremy Hill · fastest of 10 · top 5 within 1.2s1:37.344Mike Miserendino · fastest of 27 · top 5 within 0.8s1:37.621Todd Harris · fastest of 27 · top 5 within 0.6s+16.606squal +17.458s120.5%qual 121.9%1:27.636Scott Rettich · fastest of 9 · top 5 within 1.7s1:30.563Hanna Zellers · fastest of 9 · top 5 within 2.2s+9.548squal +7.750s111.8%qual 109.7%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-211:50.711J R Osborne · fastest of 20 · top 5 within 1.1s1:51.616J R Osborne · fastest of 19 · top 5 within 2.1s2:14.306Cliff White · fastest of 39 · top 5 within 1.2s2:16.700Cliff White · fastest of 38 · top 5 within 0.5s+25.084squal +23.595s122.5%qual 121.3%1:57.824Scott Rettich · fastest of 16 · top 5 within 1.0s1:59.040Scott Rettich · fastest of 16 · top 5 within 1.3s+7.424squal +7.113s106.7%qual 106.4%

By track

TrackEventsTypical % of FBBestLatest
Daytona International Speedway1100.0%100.0%Runoffs 2015100.0%Runoffs 2015
Indianapolis Motor Speedway1100.0%100.0%Runoffs 2017100.0%Runoffs 2017
Mid-Ohio Sports Car Course1100.0%100.0%Runoffs 2016100.0%Runoffs 2016
Sonoma Raceway1100.0%100.0%Runoffs 2018100.0%Runoffs 2018
Virginia International Raceway1100.0%100.0%Runoffs 2019100.0%Runoffs 2019
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 FB'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.