BoP Lab / Classes / P1

P1 vs SM vs EPx pace at every track

Lap times across years say as much about the weather as the class. % of P1 is each class's best lap as a share of P1'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 +vsEPx ×F600 +FA +FC +FE2 +FF +FP +FV +FX +GT1 +GT2 +GTX +HP +P +P1×P2 +vsSM ×SMX +SRF3 +STL +STU +T1 +T2 +T3 +T4 +Show 182 inactive classes

Series Runoffs Super Tour Both

Reference · what % is measured against

Tracks · untick to narrow Auto Club Speedway Barber Motorsports Park Blackhawk Farms Raceway Buttonwillow Raceway Park Carolina Motorsports Park Circuit of St. Louis (formerly Gateway Motorsports Circuit of the Americas Daytona International Speedway Eagles Canyon Raceway Gingerman Raceway Grattan Raceway Hallett Motor Racing Circuit High Plains Raceway Homestead-Miami Speedway Indianapolis Motor Speedway Laguna Seca Michelin Raceway Road Atlanta Mid-Ohio Sports Car Course MotorSport Ranch Cresson MSR Houston New Jersey Motorsports Park NOLA Motorsports Park Ozarks International Raceway Pacific Raceways Pittsburgh International Race Complex Podium Club at ATTESA Portland International Raceway Pueblo Motorsports Park Road America Roebling Road Sebring International Raceway Sonoma Raceway Summit Point Motorsports Park Summit Point Raceway Thunderhill Raceway Park Virginia International Raceway Watkins Glen International Willow Springs Raceway World Wide Technology Raceway

Closest to the field: P1 100.0% of P1 Gianpaolo Ciancimino, Daytona International Speedway Runoffs 2015 race · SM 121.9% of P1 Travis Wiley, Virginia International Raceway Runoffs 2022 race

% of P1Lap times

P1SMEPxsolid race · dashed qualifying · slower is lower

P1SMEPxsolid race · dashed qualifying · each class's best lap as a share of P1's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	P1			SM					EPx
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs P1	% of P1	Qual best	Race best	Trap	vs P1	% of P1
	Road America Runoffs 20262026-09-28				2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%)	2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%)	119.6Wyatt Couch+0.3 mph (+0.3%)
2 rule changes (SM: 2)1 wording · 1 othershowhide 2026-07-01 SM Rear Toe Link #40271other 2026-04-01 SM Part Number Change Request #39914wording
	Road America Runoffs 20252025-09-29				2:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%)	2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%)	119.3Francisco Barroso-0.6 mph (-0.5%)
4 rule changes (SM: 4)1 tyres & wheels · 1 wording · 2 othershowhide 2025-06-01 SM SMX Data Submission - Penalties #38248other 2025-06-01 SM SMX Penaly Clarification updated language #38337wording 2025-05-01 SM Clarify Tire Marking Regs #38005tyres & wheels 2024-12-01 SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
	Road America Runoffs 20242024-10-01	2:00.476Chip Romer · fastest of 12 · top 5 within 1.5s-0.625s (-0.52%)	2:00.418Matt Romer · fastest of 9 · top 5 within 2.1s-1.452s (-1.19%)	168.3Jason Miller+8.7 mph (+5.4%)	2:41.106Ethan Goulart · fastest of 49 · top 5 within 0.5s-1.103s (-0.68%)	2:41.486Brett Kowalski · fastest of 43 · top 5 within 0.3s-2.262s (-1.38%)	119.9Alex Bertagnoli-1.4 mph (-1.2%)	+41.068squal +40.630s	134.1%qual 133.7%
10 rule changes (P1: 6, SM: 4)3 engine · 2 induction · 2 weight · 1 suspension & brakes · 1 wording · 1 othershowhide 2024-09-01 SM SMX Camera Rule Correction #36496wording 2024-09-01 SM AIM ECU Protocol #36556engine 2024-09-01 SM OE versus OEM Definitons #36608other 2024-09-01 SM Shifter Bushing #36611suspension & brakes 2024-05-01 P1 Update GCR section 9.1.8.B.J.7 #35907engine 2024-03-01 P1 Remove redundant effective date language in GCR 9.1.8.B.J.4 #35693induction 2024-03-01 P1 Correct engine series terminology #35694engine 2024-01-01 P1 Please correct omitted punctuation #34890weight 2024-01-01 P1 Adjust restrictors and weights for Engine Table lines H and I #35229induction 2024-01-01 P1 Revise Group CN Honda K20A-FD2 Spec Line #35337weight
	Virginia International Raceway Runoffs 20232023-09-23	1:42.602Todd Vanacore · fastest of 10 · top 5 within 0.9s+1.001s (+0.99%)	1:44.329Todd Vanacore · fastest of 9 · top 5 within 0.7s-9.766s (-8.56%)	158.5Jason Miller+1.2 mph (+0.8%)	2:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%)	2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%)	120.3Jim Drago+1.1 mph (+0.9%)	+31.900squal +32.384s	130.6%qual 131.6%
8 rule changes (P1: 7, SM: 1)3 induction · 2 aero · 2 tyres & wheels · 1 weightshowhide 2023-07-01 P1 SIR Testing #34354induction 2023-07-01 P1 E&O Single Inlet Restrictor abbreviation, etc. #34369induction 2023-07-01 P1 E&O Clean up ducted air provision #34410tyres & wheels 2023-04-01 P1 E&O - Correct dimensional equivalents #34018tyres & wheels 2023-03-01 P1 November 2022 Rules Clarification for Suspension Covers #33615aero 2023-01-01 SM BOP for NB1 and NB2 #32309weight 2022-11-01 P1 Clarify body panel coverage of suspension components #33318aero 2022-10-01 P1 E&O clarification regarding forced induction #33123induction
	Virginia International Raceway Runoffs 20222022-09-24	1:41.601Todd Slusher · fastest of 9 · top 5 within 2.3s-1.073s (-1.05%)	1:54.095John Mcaleer · fastest of 9 · top 5 within 1.4s+10.597s (+10.24%)	157.2Jason Miller+1.3 mph (+0.8%)	2:14.664Danny Steyn · fastest of 60 · top 5 within 0.2s+0.112s (+0.08%)	2:19.107Travis Wiley · fastest of 58 · top 5 within 0.9s+2.648s (+1.94%)	119.2Jonathan Neudorf-0.6 mph (-0.5%)	+25.012squal +33.063s	121.9%qual 132.5%
4 rule changes (P1: 3, SM: 1)1 induction · 1 suspension & brakes · 1 tyres & wheels · 1 weightshowhide 2022-08-01 P1 Clarify authorization to use flat plate intake restrictor #32964induction 2022-05-01 P1 E&O Clarification of Bodywork Rules #32468tyres & wheels 2022-04-01 SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes 2022-01-01 P1 Displacement & Weight Change Request for 2-Cycle 6 Cylinder #31609weight
	Indianapolis Motor Speedway Runoffs 20212021-09-25	1:29.011Lee Alexander · fastest of 13 · top 5 within 2.5s-1.783s (-1.96%)	1:29.225Lee Alexander · fastest of 12 · top 5 within 3.5s-2.274s (-2.49%)	160.1Jason Miller	1:57.695Brian Henderson · fastest of 90 · top 5 within 0.5s-0.611s (-0.52%)	1:58.837Brian Henderson · fastest of 88 · top 5 within 0.3s-0.263s (-0.22%)	119.8Kyle Greenhill	+29.612squal +28.684s	133.2%qual 132.2%
12 rule changes (P1: 11, SM: 1)5 engine · 4 weight · 1 induction · 2 othershowhide 2021-09-01 P1 Move 2000cc and 2300cc engine options to individual spec lines #31012engine 2021-09-01 P1 E&O Spec Line B notes #31095weight 2021-08-01 P1 Add 1355cc spec line #30890weight 2021-05-01 P1 E&O tonneau cover provision in cockpit opening section #30458other 2021-05-01 P1 Update Spec Line B Notes #30498weight 2021-05-01 P1 Update Spec Lines C and G notes #30499weight 2021-05-01 P1 E&O Maximum Valves Per Cylinder #30559engine 2021-04-01 P1 Clean up Spec Line A notes section #30424engine 2021-04-01 P1 Clean up Spec Line H notes section #30425engine 2021-04-01 SM Updates - Obsolete Parts & BOP Parts #30438other 2021-03-01 P1 DP02 Sealed 2ltr Engine Option #30038engine 2021-03-01 P1 E&O restrictor terminology #30285induction
	Road America Runoffs 20202020-10-02	2:01.101James French · fastest of 18 · top 5 within 1.1s	2:01.870James French · fastest of 17 · top 5 within 1.8s	159.7David Locke	2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s	2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s	121.3Kyle Greenhill	+41.878squal +41.108s	134.4%qual 133.9%
6 rule changes (P1: 4, SM: 2)2 induction · 2 weight · 1 engine · 1 suspension & brakesshowhide 2020-10-01 SM Radiator E&O Clarifications #29294engine 2020-08-01 SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes 2020-05-01 P1 E&O minimum weights and intake manifolds #28731induction 2020-02-01 P1 Extend date for removing sealed DP02-spec 2.0L option #28046weight 2020-01-01 P1 Remove sealed DP02-spec 2.0 MZR spec #26753induction 2020-01-01 P1 Update Revised Spec Line F #27745weight
	Virginia International Raceway Runoffs 20192019-10-05	1:42.674Todd Slusher · fastest of 14 · top 5 within 1.5s	1:43.498Todd Slusher · fastest of 13 · top 5 within 1.0s	155.9Jim Devenport	2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s	2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s	119.8Jim Drago	+32.961squal +31.878s	131.8%qual 131.0%
18 rule changes (P1: 14, SM: 4)6 engine · 3 induction · 2 tyres & wheels · 1 removed · 1 weight · 3 wording · 2 othershowhide 2019-08-01 P1 E&O Transmissions #27098other 2019-07-01 P1 E&O Transmissions #27005tyres & wheels 2019-07-01 P1 Move minimum height provision to #27031removed 2019-07-01 P1 Remove duplicative fender louver provision #27033induction 2019-05-31 P1 Missing word E&O #26919other 2019-05-31 P1 E&O correction to GCR 9.1.8.C.C. #26927wording 2019-05-01 P1 Clean up reference to engine table #26648engine 2019-05-01 P1 Remove redundant spec line #26692engine 2019-04-01 P1 Clean Up Engine Table Language #26590engine 2019-03-01 P1 Move single-seat closed cockpit provision to #26376wording 2019-03-01 SM Request to allow aftermarket fuel filters. #26370wording 2019-02-01 P1 Correct errors in GCR section 9.1.8.C.J #26144engine 2019-02-01 SM Request 99-00 replacement Wire harnesses #25602engine 2019-02-01 SM Organize and Clarify 9.1.7.C.1.o. #25913weight 2019-02-01 SM Strike Tire Tread Language #26123tyres & wheels 2019-01-01 P1 Remove redundant inlet restrictor provisions #25877induction 2019-01-01 P1 Clarify Honda K20A-FD2 parts requirement #25949engine 2019-01-01 P1 Correct GCR section 9.1.8.C.J errors #25966induction
	Sonoma Raceway Runoffs 20182018-10-10	1:27.714Todd Slusher · fastest of 19 · top 5 within 2.1s	1:28.786Perry Richardson · fastest of 19 · top 5 within 0.9s	144.0Johnnie Crean	1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s	1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s	102.2Danny Steyn	+26.492squal +26.641s	129.8%qual 130.4%
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25	1:30.794Jim Devenport · fastest of 19 · top 5 within 2.8s	1:31.499Jim Devenport · fastest of 16 · top 5 within 2.2s		1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s	1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s		+27.601squal +27.512s	130.2%qual 130.3%
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19	1:17.308James Devenport · fastest of 14 · top 5 within 2.7s	1:19.407Gianpaolo Ciancimino · fastest of 13 · top 5 within 1.8s		1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s	1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s		+21.357squal +23.206s	126.9%qual 130.0%
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21	1:49.219Jim Downing · fastest of 9 · top 5 within 2.2s	1:49.792Gianpaolo Ciancimino · fastest of 10 · top 5 within 1.7s		2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s	2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s		+34.275squal +29.442s	131.2%qual 127.0%

By track

Track	Events	Typical % of P1	Best	Latest
Road America	4	100.0%2 of 4 with P1	100.0%Runoffs 2020	100.0%Runoffs 2024
Virginia International Raceway	3	100.0%	100.0%Runoffs 2019	100.0%Runoffs 2023
Indianapolis Motor Speedway	2	100.0%	100.0%Runoffs 2017	100.0%Runoffs 2021
Daytona International Speedway	1	100.0%	100.0%Runoffs 2015	100.0%Runoffs 2015
Mid-Ohio Sports Car Course	1	100.0%	100.0%Runoffs 2016	100.0%Runoffs 2016
Sonoma Raceway	1	100.0%	100.0%Runoffs 2018	100.0%Runoffs 2018

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 P1'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.