1D vs P at every track

1D vs P pace at every track

Lap times across years say as much about the weather as the class. % of 1D is each class's best lap as a share of 1D'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.

1DPsolid race · dashed qualifying · slower is lower

	Event	1D			P
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs 1D	% of 1D
	Road America Runoffs 20262026-09-28				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%)
1 rule change (P: 1)1 suspension & brakesshowhide 2026-01-01 P Request to Continue to Allow Carbon Brakes #39476suspension & brakes
	Road America Runoffs 20252025-09-29				2:01.180Lee Alexander · fastest of 14 · top 5 within 1.5s	2:02.122Bart Wolf · fastest of 13 · top 5 within 2.1s	165.0Jason Miller
7 rule changes (P: 7)2 induction · 2 weight · 1 engine · 1 tyres & wheels · 1 othershowhide 2025-09-01 P 13B Rotary Engine Rules Change Request #38856induction 2025-09-01 P Add Radical Cup series Radical SR3 spec line to Table 1 #38916other 2025-09-01 P Clarify spec line cars language #38943weight 2025-08-01 P RM 25-05 - Prototype Engine Table A, 2 Cycle Restrictor Change #38929induction 2025-05-01 P Add missing punctuation marks #38150weight 2025-02-01 P Correct text in engine table notes #37606engine 2025-02-01 P Update Prototype class designation #37653tyres & wheels
	Daytona International Speedway Runoffs 20152015-09-21

By track

Track	Events	Typical % of 1D	Best	Latest
Road America	2	0 of 2 with 1D
Daytona International Speedway	1	0 of 1 with 1D

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 1D'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.