BoP Lab / Classes / CF

CF vs ITR vs GTX vs FF pace at every track

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ASB-SpecCF×EPFAFCFE2vsFF ×FPFVFXGT1GT2vsGTX ×HPvsITR ×PP2SMSMXSRF3STLSTUT1T2T3T4Show 49 inactive classes

Series Runoffs Super Tour Both

Reference · what % is measured against, 12 events

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

CFITRGTXFFsolid race · dashed qualifying · slower is lower

	Event	CF			ITR				GTX				FF
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs CF	Qual best	Race best	Trap	vs CF	Qual best	Race best	Trap	vs CF
	Road America Runoffs 20262026-09-28												2:23.047David Ybarra · fastest of 20 · top 5 within 1.4s-1.858s (-1.28%)	2:23.686Nathan Down · fastest of 20 · top 5 within 1.6s-1.855s (-1.27%)	138.9Tazio Stefanelli+0.5 mph (+0.3%)
8 rule changes (ITR: 3, GTX: 3, FF: 2)2 cars added · 2 weight · 1 engine · 1 induction · 1 removed · 1 tyres & wheelsshowhide 2026-07-01 FF Clarification in FF Kent 1600 Compression Ratio Paragraph #40293engine 2026-04-01 GTX Ferrari 296 GT3 Classification Request #39873cars added 2026-03-01 GTX Remove GT3U from GCR as it is now in STU #39862removed 2026-02-01 ITR E&O: Turbo Cars in IT #39691induction 2026-01-01 FF Formula F Alternative Tire Rule Proposed Clarifications #39281tyres & wheels 2026-01-01 GTX Please Consider Adding a Spec Line to GTX Table 4 for the RCR T70 #39470cars added 2026-01-01 ITR Correct Response to Letter 38971 in October Tech Bulletin #39105weight 2025-10-01 ITR NASA Spec3 to ITR #38971weight
	Road America Runoffs 20252025-09-29												2:24.905Jonathan Kotyk · fastest of 17 · top 5 within 1.1s+2.353s (+1.65%)	2:25.541Calvin Kautz · fastest of 16 · top 5 within 0.5s+3.484s (+2.45%)	138.4Tazio Stefanelli-2.3 mph (-1.6%)
8 rule changes (ITR: 1, GTX: 3, FF: 4)2 tyres & wheels · 2 weight · 1 aero · 1 cars added · 1 engine · 1 othershowhide 2025-06-01 GTX Ligier P3 LS Swap #38164engine 2025-05-01 FF Page 228, FF tire rule 9.1.1.10.e #38251tyres & wheels 2025-05-01 GTX Request to Classify Porsche GT2 RS Clubsport #37972cars added 2025-03-01 FF Formula F Proposal to Invite Older Cars Via a Tire Rule Change #37802tyres & wheels 2025-02-01 ITR Combine RX8 Spec Lines in ITR #37383other 2025-01-01 GTX Correct language regarding OEM Areo Devices #37137aero 2024-11-01 FF Change FF/FC Weight with Sequential Gearbox #36651weight 2024-11-01 FF Alternative Oversize Honda Fit Pistons #37064weight
	Road America Runoffs 20242024-10-01												2:22.552Calvin Kautz · fastest of 13 · top 5 within 1.1s-0.364s (-0.25%)	2:22.057Sebastian Mateo Naranjo · fastest of 13 · top 5 within 0.6s-2.211s (-1.53%)	140.7Calvin Kautz+2.6 mph (+1.9%)
13 rule changes (ITR: 5, GTX: 6, FF: 2)4 weight · 3 cars added · 3 engine · 1 aero · 1 induction · 1 othershowhide 2024-10-01 FF Update to FF EGR Blanking Plate Rule #36633engine 2024-05-01 GTX Request for Spec Line 1010 Reconsideration #35009weight +300 lbs 2024-04-01 ITR Battery Change #35854weight 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 FF Honda Fit Oversize Piston Rings #35305other 2024-01-01 GTX KTM X Bow GTX #34956cars added 2024-01-01 ITR Request to classify BMW 325XIT #33889cars added 2024-01-01 ITR car classification #35263cars added 2024-01-01 ITR ADJUST WEIGHTS ON ITR CARS #35334weight -122 lbs 2023-12-01 GTX Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight 2023-11-01 ITR TIR for Turbo cars in TIR #33856induction
	Virginia International Raceway Runoffs 20232023-09-23												1:59.249Nolan Allaer · fastest of 8 · top 5 within 2.8s+0.034s (+0.03%)	2:00.583Jonathan Kotyk · fastest of 8 · top 5 within 0.4s-17.775s (-12.85%)	138.4Calvin Kautz+0.1 mph (+0.1%)
5 rule changes (GTX: 4, FF: 1)3 cars added · 1 engine · 1 inductionshowhide 2023-07-01 GTX Request Ligier LMP3 Classification #34043cars added 2023-07-01 GTX Ligier JSP4 Request #34173cars added 2023-05-01 GTX Please classify Fields Cardinal V8 #33784cars added 2023-03-01 FF Add Fast Forward Part Numbers for Honda Fit Engine #33752engine 2022-12-01 GTX GT2 (TA2)/GTA Part Number Update #33315induction
	Virginia International Raceway Runoffs 20222022-09-24												1:59.215Jonathan Kotyk · fastest of 13 · top 5 within 1.2s-0.348s (-0.29%)	2:18.358Jonathan Kotyk · fastest of 12 · top 5 within 2.4s-2.116s (-1.51%)	138.3Tim Kautz+2.2 mph (+1.6%)
10 rule changes (ITR: 2, GTX: 8)5 cars added · 2 induction · 1 suspension & brakes · 1 weight · 1 othershowhide 2022-09-01 GTX Tail lights on all GT category race cars. #32799suspension & brakes 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 2022-03-01 GTX McLaren 720s GT3 #31955cars added 2022-03-01 ITR Request to classify 93 Talon TSI AWD #31727cars added 2022-02-01 GTX Remove restrictions from GTX-FIA GT3 #32039induction 2021-10-01 GTX Request car classification #31032cars added 2021-10-01 ITR Class Turbo Cars #29774induction
	Indianapolis Motor Speedway Runoffs 20212021-09-25												1:44.359Jonathan Kotyk · fastest of 24 · top 5 within 1.1s-0.242s (-0.23%)	1:55.676Jonathan Kotyk · fastest of 23 · top 5 within 1.8s+11.152s (+10.67%)	141.6Nicholas Sheppard
8 rule changes (ITR: 1, GTX: 4, FF: 3)4 cars added · 2 engine · 2 wordingshowhide 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 2021-04-01 FF Kent crankshaft clarification #30426wording 2020-12-01 FF Allow Optional Coolant Bleed Line to Correct a Known Problem #29673engine 2020-12-01 FF Clarification regarding Honda LC1 ECU implementation date #29684engine 2020-12-01 ITR Request to classify a 2003 Honda Accord #28898cars added
	Road America Runoffs 20202020-10-02												2:22.916Simon Sikes · fastest of 14 · top 5 within 1.6s	2:24.268Jeffrey Bartz · fastest of 14 · top 5 within 0.4s	138.1Jeffrey Bartz
15 rule changes (ITR: 1, GTX: 10, FF: 4)5 cars added · 3 aero · 3 engine · 2 tyres & wheels · 1 induction · 1 othershowhide 2020-09-01 GTX GT Category Wording #29193induction 2020-08-01 FF Clarification regarding Honda LC1 ECU implementation #29135engine 2020-08-01 GTX Request Car classification #28935cars added 2020-08-01 GTX X-Bow GT4 #29088cars added 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 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 2020-05-01 ITR Cleanup 4.f Traction control #28609tyres & wheels 2020-04-01 FF E&O FF Kent Engine alternator language #28204engine 2020-03-01 FF Honda Racing HPD low cost ECU proposal #27563engine 2020-03-01 FF Update rain tire designation #28443tyres & wheels 2020-02-01 GTX Windshield Clips #27323other 2020-01-01 GTX Request Factory Five Daytona coupe classification #26308cars added
	Virginia International Raceway Runoffs 20192019-10-05												1:59.563Tyler O'Connor · fastest of 14 · top 5 within 1.4s	2:20.474Jonathan Kotyk · fastest of 14 · top 5 within 6.3s	136.2Derek Ketchie
13 rule changes (ITR: 5, GTX: 5, FF: 3)4 cars added · 3 engine · 2 induction · 2 weight · 1 suspension & brakes · 1 othershowhide 2019-08-31 ITR Request to Classify 2008-2013 BMW 128i #26724cars added 2019-08-31 ITR Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs 2019-08-31 ITR Please Classify the '13-'14 Subaru BRZ/ Scion FRS in IT #27242cars added 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 2019-05-01 ITR Request Reduction of Minimum weight for 2000-2003 Honda S2000 #26096weight +20 lbs 2019-05-01 ITR Request clarification on 9.1.3 D1.A.2 #26237induction 2019-04-01 GTX Request Ride Height Clarification #26600suspension & brakes 2019-03-01 GTX Replace FIA references with SRO #26427other 2019-02-01 FF Request for Oversize Honda Fit Pistons #25810engine 2019-02-01 FF Heat Shield - Fit Intake #26102induction 2019-02-01 FF Request catch cans/tanks clarification #26158engine 2019-01-01 GTX GTX Homologation table update #26034cars added
	Sonoma Raceway Runoffs 20182018-10-10												1:41.612Jonathon Kotyk · fastest of 22 · top 5 within 1.7s	1:42.049Jonathon Kotyk · fastest of 22 · top 5 within 1.3s	115.7Denny Renfrow
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25												1:44.601Zach Holden · fastest of 36 · top 5 within 1.2s	1:44.524Jonathon Kotyk · fastest of 36 · top 5 within 0.5s
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19												1:29.213Neil Verhagen · fastest of 14 · top 5 within 2.1s	1:30.133Neil Verhagen · fastest of 14 · top 5 within 1.4s
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21												2:02.489Tim Kautz · fastest of 25 · top 5 within 1.1s	2:03.383Rick Payne · fastest of 22 · top 5 within 0.8s

By track

Track	Events
Road America	4
Virginia International Raceway	3
Indianapolis Motor Speedway	2
Daytona International Speedway	1
Mid-Ohio Sports Car Course	1
Sonoma Raceway	1

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 reference class'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.