BoP Lab / Classes / PX

PX vs BSpc vs FRI vs GTX pace at every track

Lap times across years say as much about the weather as the class. % of PX is each class's best lap as a share of PX'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: remove one to add another)

ASB-SpecvsBSpc ×EPFAFCFE2FFFPvsFRI ×FVFXGT1GT2vsGTX ×HPPP2PX×SMSMXSRF3STLSTUT1T2T3T4Show 48 inactive classes

Reference · what % is measured against

Tracks · untick to narrow Barber Motorsports Park Buttonwillow Raceway Park Circuit of the Americas Hallett Motor Racing Circuit Michelin Raceway Road Atlanta Mid-Ohio Sports Car Course NOLA Motorsports Park Pittsburgh International Race Complex Portland International Raceway Road America Sebring International Raceway Virginia International Raceway Watkins Glen International

Closest to the field: BSpc 119.5% of PX Thomas Lepper, Buttonwillow Raceway Park Super Tour Feb 2021 race · GTX 107.5% of PX Derek Beitzel, Circuit of the Americas Super Tour Feb 2020 qualifying

% of PXLap times

PXBSpcFRIGTXsolid race · dashed qualifying · slower is lower

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

	Event	PX			BSpc					FRI					GTX
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs PX	% of PX	Qual best	Race best	Trap	vs PX	% of PX	Qual best	Race best	Trap	vs PX	% of PX
	Barber Motorsports Park Super Tour Aug 20262026-08-29														1:30.470Garry Crook · only car	1:31.890Garry Crook · only car	125.4Garry Crook
No rule changes on record between these events
	Road America June Sprints 20262026-06-05														2:07.194Anthony Smith · only car-12.897s (-9.21%)	1:59.377James French · fastest of 2-19.297s (-13.92%)	177.0James French+19.7 mph (+12.6%)
1 rule change (GTX: 1)1 cars addedshowhide 2026-04-01 GTX Ferrari 296 GT3 Classification Request #39873cars added
	Michelin Raceway Road Atlanta Super Tour Mar 20262026-03-06														1:27.748Garry Crook · only car+5.352s (+6.50%)	1:28.694Garry Crook · only car+8.785s (+10.99%)	151.5Garry Crook-1.8 mph (-1.2%)
1 rule change (GTX: 1)1 removedshowhide 2026-03-01 GTX Remove GT3U from GCR as it is now in STU #39862removed
	Buttonwillow Raceway Park Super Tour Feb 20262026-02-21														1:54.892Moze Cowper · only car+10.972s (+10.56%)	1:55.330Moze Cowper · only car+5.734s (+5.23%)	146.0Moze Cowper+29.6 mph (+25.4%)
1 rule change (GTX: 1)1 cars addedshowhide 2026-01-01 GTX Please Consider Adding a Spec Line to GTX Table 4 for the RCR T70 #39470cars added
	Road America June Sprints 20252025-06-06
2 rule changes (GTX: 2)1 cars added · 1 engineshowhide 2025-06-01 GTX Ligier P3 LS Swap #38164engine 2025-05-01 GTX Request to Classify Porsche GT2 RS Clubsport #37972cars added
	Buttonwillow Raceway Park Super Tour Feb 20252025-02-22															1:49.596Rob Scholl · only car+3.511s (+3.31%)	116.4Rob Scholl-28.2 mph (-19.5%)
1 rule change (GTX: 1)1 aeroshowhide 2025-01-01 GTX Correct language regarding OEM Areo Devices #37137aero
	Road America June Sprints 20242024-06-21														2:20.091Brian French · fastest of 3 · top 3 within 13.0s-0.378s (-0.27%)	2:18.674Brian French · fastest of 3 · top 3 within 14.2s-18.892s (-11.99%)	157.2Brian French-2.1 mph (-1.3%)
No rule changes on record between these events
	Watkins Glen International Super Tour May 20242024-05-31														1:55.821Rocky T Bolduc · fastest of 2-6.441s (-5.27%)	1:54.518Rocky T Bolduc · fastest of 2-6.036s (-5.01%)	166.4Rocky T Bolduc+18.2 mph (+12.3%)
1 rule change (GTX: 1)1 weightshowhide 2024-05-01 GTX Request for Spec Line 1010 Reconsideration #35009weight +300 lbs
	Virginia International Raceway Super Tour Apr 20242024-04-04														1:55.869Woody Whichard · fastest of 2-21.281s (-15.52%)	1:55.430Woody Whichard · fastest of 2-6.419s (-5.27%)	162.5Woody Whichard+1.6 mph (+1.0%)
No rule changes on record between these events
	Michelin Raceway Road Atlanta Super Tour Mar 20242024-03-08														1:22.396Raiden Nicol · fastest of 3 · top 3 within 60.3s-8.436s (-9.29%)	1:19.909Raiden Nicol · fastest of 3 · top 3 within 14.2s-19.603s (-19.70%)	153.4Raiden Nicol+5.6 mph (+3.8%)
No rule changes on record between these events
	Buttonwillow Raceway Park Super Tour Feb 20242024-02-23														1:43.920Robert B. Yallen · only car-3.203s (-2.99%)	1:46.085Robert B. Yallen · only car-2.696s (-2.48%)	144.6Robert B. Yallen+8.9 mph (+6.5%)
7 rule changes (GTX: 7)3 cars added · 2 engine · 1 aero · 1 weightshowhide 2024-02-01 GTX Rear Blade Spoiler Clarification #35261aero 2024-02-01 GTX GT Direct Injection allowance and rules #35437engine 2024-02-01 GTX GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine 2024-01-01 GTX KTM X Bow GTX #34956cars added 2023-12-01 GTX Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight 2023-07-01 GTX Request Ligier LMP3 Classification #34043cars added 2023-07-01 GTX Ligier JSP4 Request #34173cars added
	Road America June Sprints 20232023-06-23														2:20.469Ray Ramirez · fastest of 2+2.326s (+1.68%)	2:37.566Erik Pylypchuk · fastest of 2+17.668s (+12.63%)	159.4Ray Ramirez+2.4 mph (+1.6%)
1 rule change (GTX: 1)1 cars addedshowhide 2023-05-01 GTX Please classify Fields Cardinal V8 #33784cars added
	Virginia International Raceway Super Tour Apr 20232023-04-07														2:17.150Jim Booth · fastest of 3 · top 3 within 10.0s+19.432s (+16.51%)	2:01.849Ray Ramirez · fastest of 3 · top 3 within 1.0s+7.544s (+6.60%)	160.9Ray Ramirez-18.6 mph (-10.4%)
No rule changes on record between these events
	Michelin Raceway Road Atlanta Super Tour Mar 20232023-03-10														1:30.832Steve Weber · only car+3.201s (+3.65%)	1:39.512Steve Weber · only car+14.097s (+16.50%)	147.8Steve Weber-25.3 mph (-14.6%)
No rule changes on record between these events
	Sebring International Raceway Super Tour Jan 20232023-01-13														2:02.230Jon Field · fastest of 3 · top 3 within 15.6s-2.976s (-2.38%)	2:02.253Jon Field · fastest of 3 · top 3 within 12.4s-3.439s (-2.74%)	147.8Jon Field-15.5 mph (-9.5%)
2 rule changes (GTX: 2)1 induction · 1 suspension & brakesshowhide 2022-12-01 GTX GT2 (TA2)/GTA Part Number Update #33315induction 2022-09-01 GTX Tail lights on all GT category race cars. #32799suspension & brakes
	Road America June Sprints 20222022-06-17														2:18.143Grayson Farischon · fastest of 2-10.301s (-6.94%)	2:19.898Grayson Farischon · only car-7.941s (-5.37%)	156.9Grayson Farischon+29.6 mph (+23.2%)
No rule changes on record between these events
	Watkins Glen International Super Tour Jun 20222022-06-03														2:02.262Nio Fernandez · only car-10.115s (-7.64%)	2:00.554Nio Fernandez · only car-11.099s (-8.43%)	148.2Nio Fernandez+12.0 mph (+8.8%)
4 rule changes (GTX: 4)2 cars added · 1 weight · 1 othershowhide 2022-06-01 GTX Classify 992 GT3 Cup #32649cars added 2022-05-01 GTX Add Classification to the accepted Model Table #31981weight 2022-05-01 GTX Request to classify C7 Corvette Grand Sport IN GTX Misc #32254cars added 2022-05-01 GTX E&O list of eligible prototypes #32511other
	Virginia International Raceway Super Tour Apr 20222022-04-08														1:57.718Jacek Mucha · fastest of 3 · top 3 within 5.5s	1:54.305Jacek Mucha · fastest of 3 · top 3 within 7.1s	179.6Jacek Mucha
No rule changes on record between these events
	Michelin Raceway Road Atlanta Super Tour Mar 20222022-03-12														1:27.631Jacek Mucha · only car-2.818s (-3.12%)	1:25.415Jacek Mucha · only car-5.369s (-5.91%)	173.1Jacek Mucha+15.4 mph (+9.8%)
1 rule change (GTX: 1)1 cars addedshowhide 2022-03-01 GTX McLaren 720s GT3 #31955cars added
	Buttonwillow Raceway Park Super Tour Feb 20222022-02-17	1:43.842Dave Tweedlie · only car	1:44.025Dave Tweedlie · only car-9.156s (-8.09%)	132.0Dave Tweedlie-1.5 mph (-1.1%)											1:47.123Bob Blizzard · fastest of 2	1:48.781Bob Blizzard · fastest of 2	135.7Bob Blizzard	+4.756squal +3.281s	104.6%qual 103.2%
1 rule change (GTX: 1)1 inductionshowhide 2022-02-01 GTX Remove restrictions from GTX-FIA GT3 #32039induction
	Sebring International Raceway Super Tour Jan 20222022-01-14														2:05.206Jacek Mucha · fastest of 2-10.195s (-7.53%)	2:05.692Jacek Mucha · fastest of 2-10.330s (-7.59%)	163.3Jacek Mucha+33.5 mph (+25.8%)
5 rule changes (GTX: 5)4 cars added · 1 wordingshowhide 2021-10-01 GTX Request car classification #31032cars added 2021-09-01 GTX Request to classify 2020 Porsche 718 GT4 Clubsport MR #30956cars added 2021-08-01 GTX Request to Update GTA Obsolete Part Numbers #30615wording 2021-08-01 GTX GTX class correction to GT2/ST #30973cars added 2021-07-01 GTX Request classification of Grullon #30481cars added
	Watkins Glen International Super Tour Jun 20212021-06-18														2:12.377Andrew Wickline · only car	2:11.653Andrew Wickline · only car	136.2Andrew Wickline
No rule changes on record between these events
	Road America June Sprints 20212021-06-04	2:16.070Jim Booth · only car+7.555s (+5.88%)													2:28.444William Hayes · fastest of 3 · top 3 within 0.7s-7.025s (-4.52%)	2:27.839Nio Fernandez · fastest of 3 · top 3 within 5.5s-7.873s (-5.06%)		+12.374s qual	109.1% qual
No rule changes on record between these events
	Virginia International Raceway Super Tour Apr 20212021-04-09	2:03.668Jacek Mucha · only car	1:59.572Jacek Mucha · only car	168.1Jacek Mucha
No rule changes on record between these events
	Michelin Raceway Road Atlanta Super Tour Mar 20212021-03-19	1:29.991Jacek Mucha · only car	1:28.432Jacek Mucha · only car	171.7Jacek Mucha											1:30.449Ben Johnston · only car	1:30.784Ben Johnston · only car	157.6Ben Johnston	+2.352squal +0.458s	102.7%qual 100.5%
No rule changes on record between these events
	Buttonwillow Raceway Park Super Tour Feb 20212021-02-19		1:53.181Robert Yallen · only car	133.5Robert Yallen	2:15.802Thomas Lepper · fastest of 3 · top 3 within 3.8s	2:15.276Thomas Lepper · fastest of 3 · top 3 within 2.4s	95.8Fritz Wilke	+22.095s	119.5%
1 rule change (GTX: 1)1 inductionshowhide 2020-09-01 GTX GT Category Wording #29193induction
	Pittsburgh International Race Complex Super Tour Aug 20202020-08-28														1:59.522Andrew Wickline · only car		120.9Andrew Wickline
2 rule changes (GTX: 2)2 cars addedshowhide 2020-08-01 GTX Request Car classification #28935cars added 2020-08-01 GTX X-Bow GT4 #29088cars added
	Mid-Ohio Sports Car Course Super Tour Jul 20202020-07-17														1:35.444Colin Cohen · only car+1.284s (+1.36%)	1:36.051Colin Cohen · only car+1.954s (+2.08%)	141.9Colin Cohen-0.5 mph (-0.3%)
3 rule changes (GTX: 3)3 aeroshowhide 2020-07-01 GTX TA2 Gurney flap wicker clarification #28874aero 2020-07-01 GTX STO Gurney flap wicker clarification #28883aero 2020-07-01 GTX GT Gurney flap wicker clarification #28909aero
	Road America June Sprints 20202020-06-12	2:08.515Judd Miller · fastest of 2	2:10.496Judd Miller · fastest of 2	166.2Conrad Park											2:35.469Tyler Gonzalez · fastest of 4 · top 4 within 3.2s	2:35.712Luke Lange · fastest of 3 · top 3 within 2.6s	127.4Luke Lange	+25.216squal +26.954s	119.3%qual 121.0%
2 rule changes (GTX: 2)2 cars addedshowhide 2020-06-01 GTX Request to Re-classify SP Stock car to GTX #28333cars added 2020-05-01 GTX Request to Classify Lotus Evora GTS #27057cars added
	Circuit of the Americas Super Tour Feb 20202020-02-07	2:11.851Judd Miller · only car	2:08.836Judd Miller · only car	162.9Judd Miller											2:21.714Derek Beitzel · fastest of 8 · top 5 within 10.3s	2:22.280Derek Beitzel · fastest of 8 · top 5 within 9.7s	156.4Sean Young	+13.444squal +9.863s	110.4%qual 107.5%
1 rule change (GTX: 1)1 othershowhide 2020-02-01 GTX Windshield Clips #27323other
	Sebring International Raceway Super Tour Jan 20202020-01-10	2:11.545Jacek Mucha · only car	2:11.901Jacek Mucha · only car	155.9Jacek Mucha											2:15.401Dean Copeland · only car+1.780s (+1.33%)	2:16.022Dean Copeland · only car+1.400s (+1.04%)	129.8Dean Copeland-11.5 mph (-8.2%)	+4.121squal +3.856s	103.1%qual 102.9%
1 rule change (GTX: 1)1 cars addedshowhide 2020-01-01 GTX Request Factory Five Daytona coupe classification #26308cars added
	Mid-Ohio Sports Car Course Super Tour May 20192019-05-31														1:34.160Larry Funk · only car	1:34.097Larry Funk · only car	142.4Larry Funk
4 rule changes (GTX: 4)1 cars added · 1 engine · 1 suspension & brakes · 1 othershowhide 2019-05-01 GTX Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine 2019-05-01 GTX Request to Classify Ligier JS2 R #26535cars added 2019-04-01 GTX Request Ride Height Clarification #26600suspension & brakes 2019-03-01 GTX Replace FIA references with SRO #26427other
	Sebring International Raceway Super Tour Jan 20192019-01-11														2:13.621Brian Kleeman · fastest of 3 · top 3 within 5.4s	2:14.622Ben Johnson · fastest of 3 · top 3 within 4.3s	141.3Ben Johnson
1 earlier rule change on record, in force before Super Tour Jan 2019 (from 2019)1 cars addedshowhide 2019-01-01 GTX GTX Homologation table update #26034cars added

By track

Track	Events	Typical % of PX	Best	Latest
Road America	7	100.0%2 of 7 with PX	100.0%June Sprints 2020	100.0%June Sprints 2021
Buttonwillow Raceway Park	5	100.0%2 of 5 with PX	100.0%Super Tour Feb 2021	100.0%Super Tour Feb 2022
Michelin Raceway Road Atlanta	5	100.0%1 of 5 with PX	100.0%Super Tour Mar 2021	100.0%Super Tour Mar 2021
Sebring International Raceway	4	100.0%1 of 4 with PX	100.0%Super Tour Jan 2020	100.0%Super Tour Jan 2020
Virginia International Raceway	4	100.0%1 of 4 with PX	100.0%Super Tour Apr 2021	100.0%Super Tour Apr 2021
Watkins Glen International	3	0 of 3 with PX
Mid-Ohio Sports Car Course	2	0 of 2 with PX
Barber Motorsports Park	1	0 of 1 with PX
Circuit of the Americas	1	100.0%	100.0%Super Tour Feb 2020	100.0%Super Tour Feb 2020
Pittsburgh International Race Complex	1	0 of 1 with PX

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 PX'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.