BoP Lab / Classes / F5

F5 vs FM vs HP pace at every track

Lap times across years say as much about the weather as the class. % of F5 is each class's best lap as a share of F5'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 +F5×FA +FC +FE2 +FF +vsFM ×FP +FV +FX +GT1 +GT2 +GTX +vsHP ×P +P2 +SM +SMX +SRF3 +STL +STU +T1 +T2 +T3 +T4 +Show 49 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 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

Closest to the field: F5 100.0% of F5 Matthew Strand, Daytona International Speedway Runoffs 2015 race · FM 95.5% of F5 Bryce Cornet, Sonoma Raceway Runoffs 2018 race · HP 92.9% of F5 Vesa Silegren, Virginia International Raceway Runoffs 2022 race

% of F5Lap times

F5FMHPsolid race · dashed qualifying · slower is lower

F5FMHPsolid race · dashed qualifying · each class's best lap as a share of F5's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	F5			FM					HP
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs F5	% of F5	Qual best	Race best	Trap	vs F5	% of F5
	Road America Runoffs 20262026-09-28									2:39.406Chris Schaafsma · fastest of 15 · top 5 within 7.7s+0.621s (+0.39%)	2:38.036Steve Sargis · fastest of 11 · top 5 within 4.6s-0.234s (-0.15%)	122.7Jesse Prather-2.2 mph (-1.8%)
29 rule changes (HP: 29)7 engine · 7 weight · 4 induction · 3 cars added · 3 tyres & wheels · 1 suspension & brakes · 3 wording · 1 othershowhide 2026-08-01 HP Mini Cooper Compression Ratio #40517engine 2026-07-01 HP 1996-2000 Honda Civic (CX, DX, VP, LX) with Engine Code D16Y7 #40322engine 2026-07-01 HP 1275 Midget/Sprit Alternate intake manifold E/O #40370induction 2026-07-01 HP HP Honda Civic (92-95) #40464weight -70 lbs 2026-06-01 HP Austin Healy Sprite/ MG Midget 1275 Induction Change Request #40213weight 2026-05-01 HP Miata track width - errors and omissions #39976wording 2026-05-01 HP Triumph GT6 Spec Change. #40098induction 2026-05-01 HP Request to Classify BMW E21 320i #40110cars added 2026-05-01 HP BMW 318is 84-85 engine displacement correction #40116engine 2026-03-01 HP Clarification On Oil Cooler Ducting #39604tyres & wheels 2026-03-01 HP Honda Fit 2015-19 Error in Engine Classification #39853engine 2026-02-01 HP Triumph Spitfire 1296cc Compression Ratio Increase to 12:1 #39589engine 2026-01-01 HP E/O: Improve Consistency of the Spec Lines #39500other 2026-01-01 HP Request to Reclassify BMW 2002 Into H Production #39567cars added 2025-12-01 HP Request to Re-Classsify Datsun SPL-311 to HP from FP #39116cars added 2025-12-01 HP TR2 Notes E&O #39180weight 2025-12-01 HP Balance of Power #39187weight +50 lbs 2025-12-01 HP Alternative BOP Request for 84-87 Honda CRX/Civic #39223tyres & wheels 2025-11-01 HP Please Lower Weight of 280Z #38871weight -160 lbs 2025-11-01 HP Miata Weight Adjustment Follow Up #38949weight -25 lbs 2025-11-01 HP Weight Break for 1098 Midget / Sprite #38970weight -80 lbs 2025-11-01 HP HP Volvo 142 spec omission #38994engine 2025-11-01 HP HP Mini DOHC 1.6 #38996engine 2025-11-01 HP Add to Rabbit description #39019wording 2025-11-01 HP Clean-up 9.1.5.E.7e #39025suspension & brakes 2025-11-01 HP Add TB size to Ford Mustang (94-98) Spec Line #39130induction 2025-10-01 HP HP Plymouth Arrow spec omission #38995wording 2025-10-01 HP Add Wheel Diameter to Appendix G #39008tyres & wheels 2025-10-01 HP Add TB ID tolerance to general Prod rules #39009induction
	Road America Runoffs 20252025-09-29									2:38.785Steve Sargis · fastest of 17 · top 5 within 1.9s+0.340s (+0.21%)	2:38.270Steve Sargis · fastest of 14 · top 5 within 2.4s+0.539s (+0.34%)	124.9Chris Schaafsma+2.1 mph (+1.7%)
17 rule changes (HP: 17)8 weight · 3 induction · 2 cars added · 1 engine · 1 suspension & brakes · 2 othershowhide 2025-07-01 HP BMW Z4 update #38490induction 2025-07-01 HP EP Fiat 124 Spider Competition Adjustment Request #38498weight -50 lbs 2025-06-01 HP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -50 lbs 2025-04-01 HP Request for Classification of Chevrolet Spark #37755cars added 2025-04-01 HP Request to Lower Ford Festiva Minimum Weight to 1600 LBS #37939weight -100 lbs 2025-03-01 HP Request Competition Adjustment to BMW Z3 2.5L #37120induction 2025-03-01 HP HP Class Adjustments #37459weight +50 lbs 2025-03-01 HP Interpretation of Production Rules on Mirrors #37235other 2025-03-01 HP Weight Reduction for Honda S2000 #37466weight 2025-03-01 HP Mazda 1999 Miata 1.8L #37488weight -50 lbs 2025-03-01 HP MINI Cooper (07-13) Spec Line Correction: Errors and Omissions #37560engine 2025-02-21 HP Effective date for Jan 2025 GCR updates #37654induction 2025-01-01 HP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbs 2025-01-01 HP Request to Update 1988-1991 Civic to Match 1988-1991 CRX #37444weight -70 lbs 2024-12-01 HP MINI Cooper Spec Line Correction - Rear Brake Rotor Diameter #37176suspension & brakes 2024-11-01 HP 1275 HP Spridget Level 2 Only #36518other 2024-11-01 HP Request for Classification of 1989-1994 Suzuki Swift GT 16V Twin #36858cars added
	Road America Runoffs 20242024-10-01									2:38.445Chuck Mathis · fastest of 20 · top 5 within 3.4s-1.250s (-0.78%)	2:37.731Chuck Mathis · fastest of 19 · top 5 within 2.3s-9.713s (-5.80%)	122.8William Trainer-0.3 mph (-0.2%)
22 rule changes (HP: 22)11 weight · 4 engine · 2 cars added · 1 induction · 1 wording · 3 othershowhide 2024-08-01 HP Errant entry in HP production line item #36231other 2024-06-01 HP NIssan 300ZX Z31 to EP #35830cars added 2024-06-01 HP RX7 1993 and Up Request In EP Spec Lines, classify #36031cars added 2024-06-01 HP Clean-up Multiple EP RX-8 Spec Lines In EP #36156wording 2024-05-01 HP Replace plastic panels #35875other 2024-03-01 HP GCR Correction - Redundant HP Spec Lines #35623engine 2024-02-01 HP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weight 2024-01-01 HP Request to Review Z3 2.5 Spec Line #35073weight +50 lbs 2024-01-01 HP Parity in HP #35138other 2024-01-01 HP Spitfire classification #35224engine 2024-01-01 HP Miata Alternate Head #35253weight -50 lbs 2024-01-01 HP Triumph GT6 Adjustments #35255weight 2024-01-01 HP Honda S2000 throttle body #35272induction 2024-01-01 HP Front Header/Nose Panel Alternate Material For 84-87 CRX #35301engine 2024-01-01 HP Correction within Triumph TR8 Spec Line #35315engine 2024-01-01 HP Correction to EP 924S/944 Spec Line #35317weight 2024-01-01 HP Review Classification of HP Mazda 2 #35318weight +75 lbs 2023-12-01 HP Request to Adjust Weight of 1988-1991 CRX/Civic #35115weight -70 lbs 2023-12-01 HP Porsche 944/924S Rule Change Request #35002weight 2023-12-01 HP FP and HP Toyota Corolla #35030weight -43 lbs 2023-12-01 HP Weight Reduction for Mazda 626 #35031weight -100 lbs 2023-12-01 HP Triumph GT6 Adjustments #35054weight -30 lbs
	Virginia International Raceway Runoffs 20232023-09-23									2:14.029Chris Schaafsma · fastest of 25 · top 5 within 2.7s+0.077s (+0.06%)	2:14.681Chris Schaafsma · fastest of 24 · top 5 within 2.5s+2.878s (+2.18%)	119.4William Trainer-0.8 mph (-0.7%)
7 rule changes (HP: 7)3 induction · 2 weight · 1 cars added · 1 othershowhide 2023-09-01 HP Larger chokes #34681induction 2023-07-01 HP Correct Intake Valve Size on 1500cc Midget/Spitfire #34419induction 2023-07-01 HP ITC to FP? #34286other 2023-06-01 HP Request to Classify Sonic and Fiesta in HP #34264cars added 2023-01-01 HP MGB HP Weight Break and/or Hybrid 1/2 Prep in HP #33127weight 2023-01-01 HP Datsun 510 Help #33568weight -50 lbs 2023-01-01 HP Review Limited Prep Port Matching Rules #33600induction
	Virginia International Raceway Runoffs 20222022-09-24	1:57.689James Weida · fastest of 11 · top 5 within 3.9s+0.328s (+0.28%)	2:21.862Sven de Vries · fastest of 10 · top 5 within 14.3s+24.290s (+20.66%)	142.9Calvin Stewart+0.1 mph (+0.1%)						2:13.952Steve Sargis · fastest of 23 · top 5 within 3.9s-0.870s (-0.65%)	2:11.803Vesa Silegren · fastest of 21 · top 5 within 6.3s-3.259s (-2.41%)	120.2Chris Schaafsma-4.7 mph (-3.8%)	-10.059squal +16.263s	92.9%qual 113.8%
31 rule changes (F5: 6, HP: 25)8 induction · 6 engine · 5 cars added · 5 weight · 2 tyres & wheels · 1 wording · 4 othershowhide 2022-09-01 F5 Intake Boots Correction #33028induction 2022-09-01 HP Request to classify VW New Beetle 2.5L in EP #32725cars added 2022-09-01 HP Request Rotary Injection on Dual Y manifold #32775engine 2022-09-01 HP Request for Corrado Stroke & Displacement Correction #32985engine 2022-08-01 F5 Ensure availability of ECU for Rotax engines #32695engine 2022-07-01 F5 Clarify stepped exhaust header references #32743engine 2022-06-01 F5 593 carb boot availability and oil pump clarification #32527induction 2022-06-01 HP Subaru BRZ Model Years #32500other 2022-05-01 HP EP MX-5 Global Cup Car #32218weight 2022-05-01 HP Please Class BMW 128i in EP #32370cars added 2022-05-01 HP Inconsistency in Body Work Descriptions #32396other 2022-04-01 HP Mazda RX8 with 13b Rotary #32170induction 2022-04-01 HP Request Idle control valve clarification #32178engine 2022-04-01 HP Classify VW New Beetle in HP. #32241cars added 2022-03-01 F5 E&O class name #32194other 2022-03-01 HP Weight Change for Competition Adjustment #31182weight +45 lbs 2022-03-01 HP EP Adjustments #31858induction 2022-03-01 HP 1999 3.8L Ford Mustang to EP? #31635weight 2022-03-01 HP Improved Touring Tires #32064tyres & wheels 2022-02-01 HP Throttle Body and Idle Air #31800induction 2022-02-01 HP Incorrect Valve Size Changes in Jan 2022 GCR for FIAT X1/9 #31990engine 2022-01-01 F5 Data Box Mounting Plate #31638other 2022-01-01 HP Porsche 968 Engine Questions #31478induction 2022-01-01 HP PCS E. 2. n. 4. Add Axle Shaft to Allow FWD the Same Freedom #31592tyres & wheels 2022-01-01 HP Weight Adjustment To Fiat X1/9 Spec Lines, H-Production #31653weight -50 lbs 2022-01-01 HP 1500 Midget #31665cars added 2022-01-01 HP BMW Z3 2.5L Spec Line #31724induction 2022-01-01 HP Request weight requirement for 1500 MG Midget #31802weight 2021-12-01 HP 944S2 Restrictor #31396induction 2021-12-01 HP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars added 2021-10-01 HP E&O; MR2 Track #31120wording
	Indianapolis Motor Speedway Runoffs 20212021-09-25	1:42.619Ryan Mayfield · fastest of 22 · top 5 within 1.6s-0.517s (-0.50%)	1:43.140Sven de Vries · fastest of 20 · top 5 within 1.7s+0.280s (+0.27%)	144.4James Weida						1:54.417Steve Sargis · fastest of 42 · top 5 within 3.7s-3.004s (-2.56%)	1:56.188Steve Sargis · fastest of 42 · top 5 within 2.9s-1.381s (-1.17%)	122.0William Trainer	+13.048squal +11.798s	112.7%qual 111.5%
24 rule changes (F5: 3, HP: 21)8 cars added · 5 weight · 3 engine · 3 suspension & brakes · 2 induction · 1 tyres & wheels · 2 wordingshowhide 2021-08-01 F5 Clarify allowable assisted shifting systems #30871wording 2021-08-01 F5 Request to correct terminology #30976tyres & wheels 2021-08-01 HP Request to Allow F22c Engine for 2000-2003 Honda S2000 #30548engine 2021-08-01 HP Request a review of the S14 240SX in EP. #30873weight -200 lbs 2021-07-01 HP Lotus/Caterham 7 America Request #30392engine 2021-07-01 HP Request to classify ITC Plymouth Arrow #30588cars added 2021-07-01 HP Reclassification of the 1984/85 BMW 318i from FP to HP #30661cars added 2021-07-01 HP Reclassify Daimler SP 250 #30721cars added 2021-06-01 F5 Request to Allow Rotax 593 HO Engine #30712engine 2021-06-01 HP 924 Brakes- and Thank You. #30614suspension & brakes 2021-06-01 HP Clarify Application of Percentage Based Weight Penalties #30669weight 2021-06-01 HP Correct Induction Error on new HP Mazda 626 Spec Line #30702induction 2021-05-01 HP Volvo 142 spec line complete. #29479cars added 2021-05-01 HP Request to Classify 93-98 Volkswagen Golf to HP #29790cars added 2021-05-01 HP Appeal of Request to Move Porsche 924 to HP #30132cars added 2021-05-01 HP Change Classification of 84-87 Mazda 626 from FP to HP #30350cars added 2021-05-01 HP Fiat X1/9 brake rotors #30423suspension & brakes 2021-04-01 HP Request to Classify 2012-2015 MINI Cooper Coupe in HP #30167cars added 2021-04-01 HP Request clarification on VW 1.8 Rabbit GTI Spec Line #30368wording 2021-01-01 HP Alternate Front Brake Rotors and Calipers for EP AH 3000 #29893suspension & brakes 2020-12-01 HP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines #29195weight -50 lbs 2020-12-01 HP Correct Wording for Level 1 and Level 2 Induction Systems #29406induction 2020-12-01 HP Weight Reduction for Datsun Roadster #29409weight -75 lbs 2020-12-01 HP EP TR8 Adjustment #29512weight -100 lbs
	Road America Runoffs 20202020-10-02	2:20.954Calvin Stewart · fastest of 16 · top 5 within 1.8s	2:21.391James Weida · fastest of 14 · top 5 within 1.5s	143.2Aaron Ellis						2:39.695Daniel Meller · fastest of 19 · top 5 within 3.3s	2:47.444Steve Sargis · fastest of 15 · top 5 within 6.1s	123.1William Trainer	+26.053squal +18.741s	118.4%qual 113.3%
27 rule changes (F5: 6, HP: 21)7 engine · 5 induction · 3 cars added · 2 weight · 1 suspension & brakes · 1 tyres & wheels · 2 wording · 6 othershowhide 2020-10-01 F5 Request to Update Suzuki Engine Years for F500 #29453engine 2020-10-01 HP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheels 2020-08-01 HP EP BMW Z3 Rule Clarification #28998engine 2020-07-01 F5 Request for Cockpit Adjustment of External Jetting Devices #28359other 2020-07-01 F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine 2020-07-01 F5 Re letter requesting driver adjustable carb mixture #28840other 2020-07-01 F5 #28359 WDYT Request for Cockpit Adjustment #28875other 2020-07-01 HP Request to Classify Porsche 911 2.0L #28456cars added 2020-07-01 HP Request Dual Carbs for 1.8 VW GTI Mk1 #28922engine 2020-06-01 HP BMW Cylinder Head Casting and Part Numbers #28708engine 2020-05-01 HP Request to Classify 1990-1994 Mazda Protege #28381cars added 2020-05-01 HP Error in Mini Cooper Spec Line #28713wording 2020-04-01 HP Caterham 7 Spec Line #28498engine 2020-03-01 HP Letter #27917 #28085induction 2020-03-01 HP Request to Classify 2007 - 2013 Mini Cooper Convertible #28111cars added 2020-03-01 HP Allow HP Datsun 510 Under Level 2 to Utilize Datsun Z Brakes #28121suspension & brakes 2020-03-01 HP Request to allow 40 DCOE carb for the Datsun 510 #28195induction 2020-03-01 HP Request Ford Fiesta Weight Adjustment #28337weight 2020-02-01 HP Request for Help for Datsun 1200 #27934induction 2020-01-01 F5 Change 600cc restrictor size #27883induction 2020-01-01 HP Update years for the Mazda2, Honda Fit, & Mini #27782other 2020-01-01 HP Allow Dry Sump, Limited Prep Porsche 914 #27814other 2020-01-01 HP Please Allow Alternate Rear Axle Housing for RWD Toyota Corolla #27854other 2020-01-01 HP Request to List Mazda Miata Throttle Body Size #27907induction 2020-01-01 HP HP VW Rabbit Convertible 1.6L #1922 and 32mm chokes #27917weight 2019-12-01 HP Request to Correct Track of 1988-91 Honda Civic #27487wording 2019-12-01 HP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661engine
	Virginia International Raceway Runoffs 20192019-10-05	1:57.361Wiley Mcmahan · fastest of 15 · top 5 within 3.8s	1:57.572Wiley Mcmahan · fastest of 15 · top 5 within 4.0s	142.8Eric McRee	1:55.124Bryce Cornet · fastest of 8 · top 5 within 2.3s	2:15.816Bryce Cornet · fastest of 8 · top 5 within 4.9s	135.7Bryce Cornet	+18.244squal -2.237s	115.5%qual 98.1%	2:14.822Steve Sargis · fastest of 29 · top 5 within 1.1s	2:15.062Ron Bartell · fastest of 28 · top 5 within 1.2s	124.9William Trainer	+17.490squal +17.461s	114.9%qual 114.9%
11 rule changes (F5: 1, HP: 10)2 induction · 2 tyres & wheels · 2 weight · 1 cars added · 1 suspension & brakes · 1 wording · 2 othershowhide 2019-08-31 F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbs 2019-08-31 HP Request bodywork for Austin Healey Bugeye Sprite MK1 #27106other 2019-08-31 HP Request to classify the GMX5 2019 #27263cars added 2019-08-31 HP level one susp. component rule #27270suspension & brakes 2019-08-31 HP Clarification of Carb Rules - Prep 1 #27300induction 2019-08-31 HP Clarification of Carb Rules - Prep 2 #27301induction 2019-08-01 HP Request Miata Eligibility - 2003 #27121other 2019-04-01 HP Rollcenter Correction Clarification #25873tyres & wheels 2019-04-01 HP Hardtops #26476wording 2019-03-01 HP Do Something About the Toyota Yaris In H Production #25834weight +130 lbs 2019-03-01 HP Request to Allow 2011+ Fiesta to Change Bolt Pattern on Wheels #25929tyres & wheels
	Sonoma Raceway Runoffs 20182018-10-10	1:41.807Jeff Jorgenson · fastest of 5 · top 5 within 6.6s	1:42.491David Lapham · fastest of 5 · top 5 within 9.5s	113.3David Lapham	1:37.598Bryce Cornet · fastest of 13 · top 5 within 0.9s	1:37.909Bryce Cornet · fastest of 12 · top 5 within 1.3s	124.1Melvin David Kemper Jr	-4.582squal -4.209s	95.5%qual 95.9%	1:54.070Brian Linn · fastest of 16 · top 5 within 2.8s	1:54.434Jason Isley · fastest of 16 · top 5 within 3.3s	109.3Michael H Miller	+11.943squal +12.263s	111.7%qual 112.0%
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25	1:43.136Wiley Clinton McMahan · fastest of 38 · top 5 within 1.4s	1:42.860Wiley Clinton McMahan · fastest of 37 · top 5 within 1.6s		1:41.231Jarret Voorhies · fastest of 16 · top 5 within 1.7s	1:41.146Jarret Voorhies · fastest of 16 · top 5 within 1.2s		-1.714squal -1.905s	98.3%qual 98.2%	1:57.421Jason Isley · fastest of 46 · top 5 within 0.9s	1:57.569Vesa Silegren · fastest of 40 · top 5 within 1.1s		+14.709squal +14.285s	114.3%qual 113.9%
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19	1:28.528Calvin Stewart · fastest of 14 · top 5 within 3.9s	1:29.853Steven Thompson · fastest of 12 · top 5 within 4.5s		1:26.043Jacob Loomis · fastest of 8 · top 5 within 3.1s	1:27.922Jacob Loomis · fastest of 8 · top 5 within 2.7s		-1.931squal -2.485s	97.9%qual 97.2%	1:39.954Jason Isley · fastest of 34 · top 5 within 1.5s	1:40.442Jason Isley · fastest of 34 · top 5 within 0.4s		+10.589squal +11.426s	111.8%qual 112.9%
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21	2:01.824W. Clint McMahan · fastest of 16 · top 5 within 3.0s	2:03.298Matthew Strand · fastest of 15 · top 5 within 4.9s		1:57.804Joseph Burton-Harris · fastest of 10 · top 5 within 2.3s	1:58.029Joseph Burton-Harris · fastest of 10 · top 5 within 1.7s		-5.269squal -4.020s	95.7%qual 96.7%	2:17.369Jason Isley · fastest of 18 · top 5 within 2.5s	2:17.981Alan (Aj) Hulse · fastest of 17 · top 5 within 1.1s		+14.683squal +15.545s	111.9%qual 112.8%

By track

Track	Events	Typical % of F5	Best	Latest
Road America	4	100.0%1 of 4 with F5	100.0%Runoffs 2020	100.0%Runoffs 2020
Virginia International Raceway	3	100.0%2 of 3 with F5	100.0%Runoffs 2019	100.0%Runoffs 2022
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 F5'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.