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ITB vs FRI pace at every track

Lap times across years say as much about the weather as the class. % of ITB is each class's best lap as a share of ITB'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+F600+FA+FC+FE2+FF+FP+vsFRI×FV+FX+GT1+GT2+GTX+HP+ITB×P+P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+Show 182 inactive classes
Reference · what % is measured against, 3 events
Tracks · untick to narrow

Closest to the field: ITB 100.0% of ITB James Stevens, Circuit of St. Louis (formerly Gateway Motorsports Majors May 2016 race

1:101:201:301:401:502:005 rule changes between Majors May 2016 and SARRC 20205 ▾6 rule changes between SARRC 2020 and Southeast 20266 ▾ITB race best at Majors May 2016: 1:15.234 (James Stevens)ITB race best at SARRC 2020: 2:00.725 (Ron Fuller)ITB race best at Southeast 2026: 2:01.573 (Bradley Ross)ITB qualifying best at Majors May 2016: 1:14.498 (James Stevens)ITB qualifying best at SARRC 2020: 1:59.654 (Ron Fuller)Circuit of St. Louis (formerly Gateway Motorsports · Majors May 2016Majors May2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020Carolina Motorsports Park · Southeast 2026Southeast2026
ITBFRIsolid race · dashed qualifying · slower is lower
100%5 rule changes between Majors May 2016 and SARRC 20205 ▾6 rule changes between SARRC 2020 and Southeast 20266 ▾ITB race best at Majors May 2016: 100.0% of ITB's (James Stevens)ITB race best at SARRC 2020: 100.0% of ITB's (Ron Fuller)ITB race best at Southeast 2026: 100.0% of ITB's (Bradley Ross)ITB qualifying best at Majors May 2016: 100.0% of ITB's (James Stevens)ITB qualifying best at SARRC 2020: 100.0% of ITB's (Ron Fuller)Circuit of St. Louis (formerly Gateway Motorsports · Majors May 2016Majors May2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020Carolina Motorsports Park · Southeast 2026Southeast2026
ITBFRIsolid race · dashed qualifying · each class's best lap as a share of ITB's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventITBFRI
Qual best Race best Trap Qual best Race best Trap vs ITB % of ITB 
Carolina Motorsports Park Southeast 2026results only2026-05-232:01.573Bradley Ross · only car
6 rule changes (ITB: 6)3 cars added · 1 induction · 1 weight · 1 othershowhide
  • ITB E&O: Turbo Cars in IT #39691induction
  • ITB Battery Change #35854weight
  • ITB Honda Fit 2016 - 2020 Request #34907cars added
  • ITB Request 2nd Generation Camry to ITB #30007cars added
  • ITB Request for Car Eligibility #30070other
  • ITB Request to classify a 2003 Honda Accord #28898cars added
Michelin Raceway Road Atlanta SARRC 20202020-07-251:59.654Ron Fuller · only car2:00.725Ron Fuller · only car98.0Ron Fuller
5 rule changes (ITB: 5)2 weight · 1 cars added · 1 induction · 1 tyres & wheelsshowhide
  • ITB Cleanup 4.f Traction control #28609tyres & wheels
  • ITB Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs
  • ITB Request to allow 07-11 Mini in ITB as BPSEC configuration #26997weight
  • ITB Request clarification on 9.1.3 D1.A.2 #26237induction
  • ITB Request to Dual-Class Honda Fit and B-Spec Cars Into ITC and #25347cars added
Circuit of St. Louis (formerly Gateway Motorsports Majors May 20162016-05-141:14.498James Stevens · fastest of 3 · top 3 within 4.4s1:15.234James Stevens · fastest of 3 · top 3 within 2.1s

By track

TrackEvents Typical % of ITB Best Latest 
Carolina Motorsports Park1100.0%100.0%Southeast 2026100.0%Southeast 2026
Circuit of St. Louis (formerly Gateway Motorsports1100.0%100.0%Majors May 2016100.0%Majors May 2016
Michelin Raceway Road Atlanta1100.0%100.0%SARRC 2020100.0%SARRC 2020
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 ITB'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.