BoP Labbeta

BoP Lab / Classes / P

P pace at every track

Lap times across years say as much about the weather as the class. % of the field is each class's best lap as a share of the field's on the same day (every class that ran that day but the ones shown, each scaled by its usual pace against SM and averaged, with each shown class's own track character taken out, so one figure reads the same across years and tracks), 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)
1D+AS+B Spec+B-spec+B-Spec+BS+BSpc+BSpec+C6+CF+CFC+CTA+CTB+CTC+CTD+EP+EPx+F5+F6+F500+F1000+FA+FB+FC+FE+FE 2+FE2+FF+FM+FP+FRI+FV+FX+GT-1+GT-2+GT-X+GT1+GT2+GT3+GT3U+GTA+GTL+GTX+HP+IT7+ITA+ITB+ITC+ITE+ITE-O+ITR+ITS+P×P1+P2+PX+S7+SM+SM +SMSE+SMSE-T+SMX+SPU+SRF+SRF 3+SRF3+SSM+STL+STU+SUN+T1+T2+T3+T4+TTA+Unknown+Hide inactive classes
Series
Reference · what % is measured against, 2 eventsall classes that day, as if at an average track
Tracks · untick to narrow

Closest to the field: P 77.3% of the field Bart Wolf, Road America Runoffs 2025 race

2:012:022:031 rule change between Runoffs 2025 and Runoffs 20261 ▾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
Psolid race · dashed qualifying · slower is lower
77.5%78%78.5%1 rule change between Runoffs 2025 and Runoffs 20261 ▾P race best at Runoffs 2025: 77.3% of Field's (Bart Wolf)P race best at Runoffs 2026: 78.4% of Field's (Lawrence Loshak)P qualifying best at Runoffs 2025: 77.3% of Field's (Lee Alexander)P qualifying best at Runoffs 2026: 77.9% of Field's (Perry Richardson)Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
Psolid race · dashed qualifying · each class's best lap as a share of the field's at the same event (the field index, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventP
Qual best Race best Trap % of the field 
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%)78.4%qual 77.9%
1 rule change (P: 1)1 other · Prototype carbon-carbon and carbon-ceramic brake rotors permitted; rotor material now unrestricted.showhide
  • Request to Continue to Allow Carbon Brakes #39476otheraddedPrototype carbon-carbon and carbon-ceramic brake rotors permitted; rotor material now unrestricted.
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 Miller77.3%qual 77.3%
7 earlier rule changes on record, in force before Runoffs 2025 (from 2025)2 cars added · 2 engine · 3 wording · Prototype 13B rotary restrictor changes to 40mm SIR fuel injection or 41.5mm venturi carburetor. · Prototype class adds Radical SR3 to Table 1 Spec Line Cars. · Prototype P2 cars may now run P2 specification or modify to Prototype rules in Prototype class; Radical Cup series added as spec line car. · Prototype Engine Table A 2-cycle restrictor reduced from 40mm to 38mm venturi size. · Class P adds engine and car notes: Line D no restrictor at 1150 lbs; Line G CN Honda K20A-FD2 unrestricted ITBs at 1500 lbs; Beasley B2 Mazda 12A 40.5mm venturi; P2 2000cc auto rules clarified. · Prototype Spec Lines B and D: wording corrections to engine table notes; no performance change. · Prototype class renamed from P1 to P, with P1 and P2 designations removed throughout GCR sections 9.1, 9.2.2, 9.3.37, and appendices.showhide
  • 13B Rotary Engine Rules Change Request #38856engineunclearPrototype 13B rotary restrictor changes to 40mm SIR fuel injection or 41.5mm venturi carburetor.
  • Add Radical Cup series Radical SR3 spec line to Table 1 #38916cars addedaddedPrototype class adds Radical SR3 to Table 1 Spec Line Cars.
  • Clarify spec line cars language #38943cars addedaddedPrototype P2 cars may now run P2 specification or modify to Prototype rules in Prototype class; Radical Cup series added as spec line car.
  • RM 25-05 - Prototype Engine Table A, 2 Cycle Restrictor Change #38929engineslowerenginePrototype Engine Table A 2-cycle restrictor reduced from 40mm to 38mm venturi size.
  • Add missing punctuation marks #38150wordingaddedClass P adds engine and car notes: Line D no restrictor at 1150 lbs; Line G CN Honda K20A-FD2 unrestricted ITBs at 1500 lbs; Beasley B2 Mazda 12A 40.5mm venturi; P2 2000cc auto rules clarified.
  • Correct text in engine table notes #37606wordingwordingPrototype Spec Lines B and D: wording corrections to engine table notes; no performance change.
  • Update Prototype class designation #37653wordingwordingPrototype class renamed from P1 to P, with P1 and P2 designations removed throughout GCR sections 9.1, 9.2.2, 9.3.37, and appendices.

By track

TrackEvents Typical % of the field Best Latest 
Road America277.3%77.3%Runoffs 202578.4%Runoffs 2026
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 field's best on the same day (every class that ran that day but the ones shown, each scaled by its usual pace against SM and averaged, with each shown class's own track character taken out, so one figure reads the same across years and tracks): the weather and the day cancel out, so one figure compares across years where lap times cannot, and across tracks too, since the class's own character at each track is taken out. A track with only one or two events on record is corrected less, since there is less to go on. A best from fewer than three cars is greyed. The rule changes that took effect between two events are folded between their rows.