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BoP Lab / Classes / F6

F6 vs P pace at every track

Lap times across years say as much about the weather as the class. % of F6 is each class's best lap as a share of F6'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.

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AS+B-Spec+EP+F6×FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+vsP×P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+Show 50 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: F6 100.0% of F6 Calvin Stewart, Virginia International Raceway Runoffs 2023 race · P 87.9% of F6 Lawrence Loshak, Road America Runoffs 2026 race

1:552:002:052:102:152:207 rule changes between Runoffs 2024 and Runoffs 20257 ▾1 rule change between Runoffs 2025 and Runoffs 20261 ▾F6 race best at Runoffs 2023: 1:58.816 (Calvin Stewart)F6 race best at Runoffs 2024: 2:18.840 (James Weida)F6 race best at Runoffs 2026: 2:20.255 (James Weida)F6 qualifying best at Runoffs 2023: 1:57.437 (Calvin Stewart)F6 qualifying best at Runoffs 2024: 2:19.106 (Calvin Stewart)F6 qualifying best at Runoffs 2026: 2:18.489 (Calvin Stewart)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)Virginia International Raceway · Runoffs 2023Runoffs2023Road America · Runoffs 2024Runoffs2024Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
F6Psolid race · dashed qualifying · slower is lower
90%95%100%7 rule changes between Runoffs 2024 and Runoffs 20257 ▾1 rule change between Runoffs 2025 and Runoffs 20261 ▾F6 race best at Runoffs 2023: 100.0% of F6's (Calvin Stewart)F6 race best at Runoffs 2024: 100.0% of F6's (James Weida)F6 race best at Runoffs 2026: 100.0% of F6's (James Weida)F6 qualifying best at Runoffs 2023: 100.0% of F6's (Calvin Stewart)F6 qualifying best at Runoffs 2024: 100.0% of F6's (Calvin Stewart)F6 qualifying best at Runoffs 2026: 100.0% of F6's (Calvin Stewart)P race best at Runoffs 2026: 87.9% of F6's (Lawrence Loshak)P qualifying best at Runoffs 2026: 88.3% of F6's (Perry Richardson)Virginia International Raceway · Runoffs 2023Runoffs2023Road America · Runoffs 2024Runoffs2024Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
F6Psolid race · dashed qualifying · each class's best lap as a share of F6's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventF6P
Qual best Race best Trap Qual best Race best Trap vs F6 % of F6 
Road America Runoffs 20262026-09-282:18.489Calvin Stewart · fastest of 13 · top 5 within 4.2s-0.617s (-0.44%)2:20.255James Weida · fastest of 13 · top 5 within 2.0s+1.415s (+1.02%)143.0Calvin Stewart-4.5 mph (-3.1%)2:02.281Perry 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%)-16.972squal -16.208s87.9%qual 88.3%
1 rule change (P: 1)1 suspension & brakesshowhide
  • P Request to Continue to Allow Carbon Brakes #39476suspension & brakes
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
7 rule changes (P: 7)2 induction · 2 weight · 1 engine · 1 tyres & wheels · 1 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
  • P Correct text in engine table notes #37606engine
  • P Update Prototype class designation #37653tyres & wheels
Road America Runoffs 20242024-10-012:19.106Calvin Stewart · fastest of 22 · top 5 within 1.3s2:18.840James Weida · fastest of 22 · top 5 within 1.0s147.6Calvin Stewart
No rule changes on record between these events
Virginia International Raceway Runoffs 20232023-09-231:57.437Calvin Stewart · fastest of 9 · top 5 within 4.7s1:58.816Calvin Stewart · fastest of 9 · top 5 within 3.6s144.0Calvin Stewart

By track

TrackEvents Typical % of F6 Best Latest 
Road America3100.0%2 of 3 with F6100.0%Runoffs 2024100.0%Runoffs 2026
Virginia International Raceway1100.0%100.0%Runoffs 2023100.0%Runoffs 2023
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 F6'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.