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BoP Lab / Classes / FRI

FRI vs ITR vs CF vs P pace at every track

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
ASB-SpecvsCF×EPF600FAFCFE2FFFPFRI×FVFXGT1GT2GTXHPvsITR×vsP×P2SMSMXSRF3STLSTUT1T2T3T4Show 50 inactive classes
Series
Reference · what % is measured against, 2 events
Tracks · untick to narrow
2:012:022:034 rule changes between Runoffs 2025 and Runoffs 20264 ▾P race best at Runoffs 2025: 2:02.122 (Bart Wolf)P race best at Runoffs 2026: 2:03.283 (Lawrence Loshak)P qualifying best at Runoffs 2025: 2:01.180 (Lee Alexander)P qualifying best at Runoffs 2026: 2:02.281 (Perry Richardson)Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
FRIITRCFPsolid race · dashed qualifying · slower is lower
EventFRIITRCFP
Qual best Race best Trap Qual best Race best Trap vs FRI Qual best Race best Trap vs FRI Qual best Race best Trap vs FRI 
Road America Runoffs 20262026-09-282:02.281Perry Richardson · fastest of 10 · top 5 within 1.3s+1.101s (+0.91%)2:03.283Lawrence Loshak · fastest of 10 · top 5 within 0.8s+1.161s (+0.95%)165.6Jason Miller+0.7 mph (+0.4%)
4 rule changes (ITR: 3, P: 1)2 weight · 1 induction · 1 suspension & brakesshowhide
  • ITR E&O: Turbo Cars in IT #39691induction
  • ITR Correct Response to Letter 38971 in October Tech Bulletin #39105weight
  • P Request to Continue to Allow Carbon Brakes #39476suspension & brakes
  • ITR NASA Spec3 to ITR #38971weight
Road America Runoffs 20252025-09-292:01.180Lee Alexander · fastest of 14 · top 5 within 1.5s2:02.122Bart Wolf · fastest of 13 · top 5 within 2.1s165.0Jason Miller
22 earlier rule changes on record, in force before Runoffs 2025 (from 2019)6 cars added · 6 weight · 5 induction · 2 tyres & wheels · 1 engine · 2 othershowhide
  • P 13B Rotary Engine Rules Change Request #38856induction
  • P Add Radical Cup series Radical SR3 spec line to Table 1 #38916other
  • P Clarify spec line cars language #38943weight
  • P RM 25-05 - Prototype Engine Table A, 2 Cycle Restrictor Change #38929induction
  • P Add missing punctuation marks #38150weight
  • ITR Combine RX8 Spec Lines in ITR #37383other
  • P Correct text in engine table notes #37606engine
  • P Update Prototype class designation #37653tyres & wheels
  • ITR Battery Change #35854weight
  • ITR Request to classify BMW 325XIT #33889cars added
  • ITR car classification #35263cars added
  • ITR ADJUST WEIGHTS ON ITR CARS #35334weight -122 lbs
  • ITR TIR for Turbo cars in TIR #33856induction
  • ITR Request to classify 93 Talon TSI AWD #31727cars added
  • ITR Class Turbo Cars #29774induction
  • ITR Request to classify a 2003 Honda Accord #28898cars added
  • ITR Cleanup 4.f Traction control #28609tyres & wheels
  • ITR Request to Classify 2008-2013 BMW 128i #26724cars added
  • ITR Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs
  • ITR Please Classify the '13-'14 Subaru BRZ/ Scion FRS in IT #27242cars added
  • ITR Request Reduction of Minimum weight for 2000-2003 Honda S2000 #26096weight +20 lbs
  • ITR Request clarification on 9.1.3 D1.A.2 #26237induction

By track

TrackEvents 
Road America2
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 the reference class'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.