BoP Lab / Classes / P2

P2 vs STU vs EP pace at every track

Lap times across years say as much about the weather as the class. % of P2 is each class's best lap as a share of P2'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 +vsEP ×FA +FC +FE2 +FF +FP +FV +FX +GT1 +GT2 +GTX +HP +P +P2×SM +SMX +SRF3 +STL +vsSTU ×T1 +T2 +T3 +T4 +Show 51 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: P2 100.0% of P2 Jeff Shafer, Daytona International Speedway Runoffs 2015 race · STU 89.2% of P2 Franklin Church, Sonoma Raceway Runoffs 2018 qualifying · EP 110.3% of P2 Jesse Prather, Virginia International Raceway Runoffs 2019 race

% of P2Lap times

P2STUEPsolid race · dashed qualifying · slower is lower

P2STUEPsolid race · dashed qualifying · each class's best lap as a share of P2's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	P2			STU					EP
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs P2	% of P2	Qual best	Race best	Trap	vs P2	% of P2
	Road America Runoffs 20262026-09-28	2:10.606Greg Gyann · fastest of 11 · top 5 within 5.3s+3.201s (+2.51%)	2:09.441Mike Reupert · fastest of 11 · top 5 within 4.2s+1.119s (+0.87%)	155.0Matt Strand+2.4 mph (+1.6%)	2:24.912Richard Astacio · fastest of 17 · top 5 within 2.6s+1.829s (+1.28%)	2:26.416Richard Astacio · fastest of 16 · top 5 within 1.5s+1.919s (+1.33%)	145.1Hugh Stewart+0.8 mph (+0.5%)	+16.975squal +14.306s	113.1%qual 111.0%	2:29.239Jon Brakke · fastest of 15 · top 5 within 5.2s+1.946s (+1.32%)	2:27.869Jon Brakke · fastest of 15 · top 5 within 5.2s-0.887s (-0.60%)	137.0Jon Brakke-3.8 mph (-2.7%)	+18.428squal +18.633s	114.2%qual 114.3%
36 rule changes (STU: 15, EP: 21)13 weight · 9 induction · 5 engine · 4 tyres & wheels · 1 suspension & brakes · 3 wording · 1 othershowhide 2026-09-01 STU Wheel and tire requirements for GT3U #40679tyres & wheels 2026-08-01 EP Mini Cooper Compression Ratio #40517engine 2026-07-01 EP 1996-2000 Honda Civic (CX, DX, VP, LX) with Engine Code D16Y7 #40322engine 2026-07-01 EP 1275 Midget/Sprit Alternate intake manifold E/O #40370induction 2026-07-01 EP HP Honda Civic (92-95) #40464weight -70 lbs 2026-07-01 STU 9” Wheels #40433tyres & wheels 2026-07-01 STU Weight adjustment to former GT3U cars #40474weight 2026-06-01 EP Honda S2000 Hardtop #40138other 2026-06-01 STU Request to allow BMW M50B20TU engine in STU #40202engine 2026-06-01 STU Calculating Weight #40224weight 2026-05-01 EP Miata track width - errors and omissions #39976wording 2026-05-01 EP Triumph GT6 Spec Change. #40098induction 2026-05-01 STU Turbo Restrictor Size Increase Request #40008induction 2026-05-01 STU GT86 Cups Car in STU #40028weight 2026-04-01 STU Mazda Rx-8 Renesis - Streetported Variant & Added Weight #39785weight 2026-04-01 STU Eliminate 33 and 34 mm TIRs #39872weight 2026-03-01 STU Fab 9 Racing Intake Manifold in STU #39767induction 2026-01-01 EP Request to Update E30 BMW Throttle Body Diameter Verbiage #39363induction 2026-01-01 STU Request for Permission on Aftermarket Turbo Kit and Intake #39529induction 2025-12-01 EP TR2 Notes E&O #39180weight 2025-12-01 EP Balance of Power #39187weight +50 lbs 2025-12-01 STU Turbo Inlet Restrictor Table #38961induction 2025-12-01 STU 275 Tire Rule #38983tyres & wheels 2025-12-01 STU STU Honda Engine weight penalty #39375weight 2025-11-01 EP Please Lower Weight of 280Z #38871weight -160 lbs 2025-11-01 EP Miata Weight Adjustment Follow Up #38949weight -25 lbs 2025-11-01 EP Weight Break for 1098 Midget / Sprite #38970weight -80 lbs 2025-11-01 EP HP Volvo 142 spec omission #38994engine 2025-11-01 EP HP Mini DOHC 1.6 #38996engine 2025-11-01 EP Add to Rabbit description #39019wording 2025-11-01 EP Clean-up 9.1.5.E.7e #39025suspension & brakes 2025-11-01 EP Add TB size to Ford Mustang (94-98) Spec Line #39130induction 2025-11-01 STU Non-Homologated Engine Swaps - Specifically K24A2 w/ Honda CRZ #38746weight 2025-10-01 EP HP Plymouth Arrow spec omission #38995wording 2025-10-01 EP Add Wheel Diameter to Appendix G #39008tyres & wheels 2025-10-01 EP Add TB ID tolerance to general Prod rules #39009induction
	Road America Runoffs 20252025-09-29				2:23.083Peter Cunningham · fastest of 16 · top 5 within 2.6s-3.144s (-2.15%)	2:24.497Chip Herr · fastest of 15 · top 5 within 3.8s-1.327s (-0.91%)	144.3Chip Herr-1.0 mph (-0.7%)			2:27.293Jon Brakke · fastest of 21 · top 5 within 2.1s+0.490s (+0.33%)	2:28.756Tyler Ladd · fastest of 19 · top 5 within 1.9s+0.887s (+0.60%)	140.8Jon Brakke+0.1 mph (+0.1%)
33 rule changes (P2: 1, STU: 18, EP: 14)15 weight · 4 induction · 3 engine · 3 tyres & wheels · 2 cars added · 2 wording · 4 othershowhide 2025-09-01 STU Lotus Weight Reduction E&O #38919weight 2025-08-01 STU STU-TCR Adjustments #38723weight 2025-08-01 STU Lotus Weight Reduction #38772weight -50 lbs 2025-07-01 EP BMW Z4 update #38490induction 2025-07-01 EP EP Fiat 124 Spider Competition Adjustment Request #38498weight -50 lbs 2025-07-01 STU 2.8-3.2L N/A Engine Allowances #38007engine 2025-07-01 STU 2006-2015 Mazda Miata Intake Manifold #38422induction 2025-07-01 STU Requesting Approval of the JDM Honda h23a #38489cars added 2025-06-01 EP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -50 lbs 2025-05-01 STU Wheel Size Inconsistency #38018tyres & wheels 2025-05-01 STU Table C: STU-GT3U Clarification #38268weight 2025-04-01 EP Request for Classification of Chevrolet Spark #37755cars added 2025-04-01 EP Request to Lower Ford Festiva Minimum Weight to 1600 LBS #37939weight -100 lbs 2025-03-01 EP Request Competition Adjustment to BMW Z3 2.5L #37120induction 2025-03-01 EP Interpretation of Production Rules on Mirrors #37235other 2025-03-01 EP Weight Reduction for Honda S2000 #37466weight 2025-03-01 EP Mazda 1999 Miata 1.8L #37488weight -50 lbs 2025-03-01 STU BMW N54/N55 Engine Allowance Follow Up #37447engine 2025-03-01 STU STU Mini Cooper pulley size clarification re: letter #36980 #37717wording 2025-03-01 STU Question About a Weight Modifier #37782weight 2025-03-01 STU Increase Minimum Weight #37919weight +100 lbs 2025-02-21 EP Effective date for Jan 2025 GCR updates #37654induction 2025-01-01 EP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbs 2025-01-01 STU Audi 1.8t Wagon STU Table B #36685weight 2025-01-01 STU Merger GT3 to STU #37486other 2025-01-01 STU GT3 TCR Tire allowance #37494tyres & wheels 2024-12-01 EP Triumph GT6 Adjustments #37112weight 2024-12-01 P2 2000 cc Pinto Engine Car Weight #37187weight 2024-12-01 STU Request to Remove Miata Hubs from General category #37138tyres & wheels 2024-12-01 STU BMW N54/N55 Engine Allowance #37146engine 2024-11-01 EP 1275 HP Spridget Level 2 Only #36518other 2024-11-01 EP NA Miata Track Width Correction #36902wording 2024-11-01 STU R53 15% Pulley Request #36980other
	Road America Runoffs 20242024-10-01	2:07.405Bart Wolf · fastest of 14 · top 5 within 3.0s-1.109s (-0.86%)	2:08.322Bart Wolf · fastest of 13 · top 5 within 0.6s-1.471s (-1.13%)	152.5Lucian Pancea-0.6 mph (-0.4%)	2:26.227Thomas Noble · fastest of 18 · top 5 within 2.3s-1.656s (-1.12%)	2:25.824Thomas Noble · fastest of 17 · top 5 within 2.4s-2.586s (-1.74%)	145.3Thomas Noble+1.1 mph (+0.8%)	+17.502squal +18.822s	113.6%qual 114.8%	2:26.803Tyler Ladd · fastest of 16 · top 5 within 4.1s-0.519s (-0.35%)	2:27.869Tyler Ladd · fastest of 16 · top 5 within 3.6s-1.178s (-0.79%)	140.7Bill Miller-1.0 mph (-0.7%)	+19.547squal +19.398s	115.2%qual 115.2%
23 rule changes (P2: 5, STU: 4, EP: 14)8 weight · 6 engine · 2 cars added · 2 induction · 1 tyres & wheels · 1 wording · 3 othershowhide 2024-08-01 EP Errant entry in HP production line item #36231other 2024-08-01 STU RWD Turbo Disadvantage #36255induction 2024-06-01 EP NIssan 300ZX Z31 to EP #35830cars added 2024-06-01 EP RX7 1993 and Up Request In EP Spec Lines, classify #36031cars added 2024-06-01 EP Clean-up Multiple EP RX-8 Spec Lines In EP #36156wording 2024-05-01 P2 CN Spec ECU #35835engine 2024-05-01 P2 E&O - Correct FIA Group CN spec line notes #35900tyres & wheels 2024-03-01 EP GCR Correction - Redundant HP Spec Lines #35623engine 2024-03-01 STU Letter #35397 addendum #35453weight 2024-03-01 STU S54 Drysump #35464other 2024-02-01 EP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weight 2024-02-01 STU ST Electric-Assisted Steering Systems #35066other 2024-01-01 EP Request to Review Z3 2.5 Spec Line #35073weight +50 lbs 2024-01-01 EP Miata Alternate Head #35253weight -50 lbs 2024-01-01 EP Triumph GT6 Adjustments #35255weight 2024-01-01 EP Honda S2000 throttle body #35272induction 2024-01-01 EP Correction within Triumph TR8 Spec Line #35315engine 2024-01-01 EP Correction to EP 924S/944 Spec Line #35317weight 2024-01-01 P2 E&O - Clarify B.1 modified engine range in AMAC spec lines #35225engine 2024-01-01 P2 Replacement Engine Crankcase for 07/08 Suzuki GSX-R1000 Engines #35340engine 2023-12-01 EP Porsche 944/924S Rule Change Request #35002weight 2023-12-01 EP Triumph GT6 Adjustments #35054weight -30 lbs 2023-12-01 P2 Correct Table 1 for Engine Date Range Specifications #35182engine
	Virginia International Raceway Runoffs 20232023-09-23	1:48.590Greg Gyann · fastest of 12 · top 5 within 1.7s+1.024s (+0.95%)	1:48.829Lucian Pancea · fastest of 11 · top 5 within 0.9s-27.005s (-19.88%)	150.9Lucian Pancea-0.2 mph (-0.2%)	2:00.389Johan Schwartz · fastest of 13 · top 5 within 2.3s-0.226s (-0.19%)	2:02.302Mark Liller · fastest of 14 · top 5 within 1.6s-30.055s (-19.73%)	144.0Mark Liller+0.1 mph (+0.1%)	+13.473squal +11.799s	112.4%qual 110.9%	2:03.215John Hainsworth · fastest of 24 · top 5 within 4.3s+0.889s (+0.73%)	2:04.050Greg Ira · fastest of 22 · top 5 within 5.3s-26.805s (-17.77%)	144.6Greg Ira+3.1 mph (+2.2%)	+15.221squal +14.625s	114.0%qual 113.5%
24 rule changes (P2: 8, STU: 3, EP: 13)6 weight · 5 engine · 4 induction · 2 cars added · 2 suspension & brakes · 1 tyres & wheels · 2 wording · 2 othershowhide 2023-09-01 EP Hub Note Clean Up In EP TR8 Spec Line #34649wording 2023-09-01 EP Triumph GT6 Adjustments #34662other 2023-09-01 EP Triumph GT6 Adjustments: Brakes #34663suspension & brakes 2023-07-01 EP Correct Intake Valve Size on 1500cc Midget/Spitfire #34419induction 2023-07-01 STU 2022 Toyota GR Cup for STU #34449cars added 2023-06-01 EP 914-6 Valve Size Correction #34185engine 2023-05-01 P2 Clarify minimum side body height requirement #34143tyres & wheels 2023-05-01 P2 Clarify closed cockpit single seat car allowance #34144wording 2023-04-01 EP Investigate Parity of Z3 #33343induction 2023-04-01 P2 Remove redundant effective date language and update engine table #34012engine 2023-04-01 P2 E&O - Correct dimensional equivalents #34038weight 2023-04-01 STU Alternate OEM Miata Intake Manifold #33827induction 2023-03-01 STU E&O STU NA Weight Chart. #33737weight 2023-01-01 EP Revise 79-85 RX7 Brake Spec Line Allowance #33293suspension & brakes 2023-01-01 EP Request alternate carburetors for EP 280z #33405engine 2023-01-01 EP Fuel Injection 12a Mazda RX3 #33434engine 2023-01-01 EP Mazda RX3 - Weight Reduction #33436weight -50 lbs 2023-01-01 EP Request TR8 Dry Sump Allowance #33460other 2023-01-01 EP Review Limited Prep Port Matching Rules #33600induction 2023-01-01 EP 280ZX Classification Request #33611weight 2023-01-01 P2 Request to Classify Sebeco NP01 #33378cars added 2023-01-01 P2 Radical spec line clarifications #33485weight 2023-01-01 P2 E&O original class intent #33519weight 2023-01-01 P2 Update Engine Table Spec Line B.1 #33608engine
	Virginia International Raceway Runoffs 20222022-09-24	1:47.566Tim Day Jr · fastest of 12 · top 5 within 3.0s-1.545s (-1.42%)	2:15.834Greg Gyann · fastest of 12 · top 5 within 10.1s+25.576s (+23.20%)	151.1Robert Iversen+1.8 mph (+1.2%)	2:00.615Johan Schwartz · fastest of 21 · top 5 within 2.6s+0.667s (+0.56%)	2:32.357Mark Liller · fastest of 19 · top 5 within 4.3s+31.874s (+26.46%)	143.9Johan Schwartz+0.1 mph (+0.1%)	+16.523squal +13.049s	112.2%qual 112.1%	2:02.326Jesse Prather · fastest of 17 · top 5 within 3.2s+1.339s (+1.11%)	2:30.855Jesse Prather · fastest of 15 · top 5 within 2.5s+29.224s (+24.03%)	141.5Jesse Prather-6.0 mph (-4.1%)	+15.021squal +14.760s	111.1%qual 113.7%
52 rule changes (P2: 10, STU: 21, EP: 21)12 weight · 10 engine · 8 induction · 6 tyres & wheels · 5 cars added · 2 aero · 2 wording · 7 othershowhide 2022-09-01 EP Request to classify VW New Beetle 2.5L in EP #32725cars added 2022-09-01 EP Request Rotary Injection on Dual Y manifold #32775engine 2022-09-01 EP Request for Corrado Stroke & Displacement Correction #32985engine 2022-08-01 STU Request Mazda 13 B turbo #32668induction 2022-08-01 STU Hood Vents and Intercooler Scoops #32733other 2022-08-01 STU Non 4 valve weight reduction removed #32808weight 2022-07-01 STU Error in new minimum weight table when combined with other text #32711weight 2022-07-01 STU Redundant Language in May GCR #32713engine 2022-06-01 EP Subaru BRZ Model Years #32500other 2022-05-01 EP EP MX-5 Global Cup Car #32218weight 2022-05-01 EP Please Class BMW 128i in EP #32370cars added 2022-05-01 EP Inconsistency in Body Work Descriptions #32396other 2022-05-01 P2 E&O Clarification of Chassis Construction Requirements #32469tyres & wheels 2022-05-01 P2 Clean up P2 wording #32525wording 2022-05-01 STU Opposed to the Proposed STU Weight Chart #32381weight 2022-05-01 STU Clarification request for GCR 9.1.4.D.3.a Splitter Definition #32414aero 2022-04-01 EP Mazda RX8 with 13b Rotary #32170induction 2022-04-01 EP Request Idle control valve clarification #32178engine 2022-04-01 P2 After Market to Aftermarket #32373other 2022-04-01 STU Request Adjustment to Min Weight for STU BMW E36 M3 (95-99) #31535weight -90 lbs 2022-04-01 STU BMW E36 M3 Canadian (North American) S50B32 engine #31866engine 2022-04-01 STU Engine Swap Origin Country #32209engine 2022-04-01 STU CRX/Civic Del Sol #32214cars added 2022-04-01 STU Error correction #32383weight 2022-04-01 STU Single TB Weight Modifiers Add to Chart #32393weight 2022-03-01 EP EP Adjustments #31858induction 2022-03-01 EP 1999 3.8L Ford Mustang to EP? #31635weight 2022-03-01 EP Improved Touring Tires #32064tyres & wheels 2022-03-01 P2 Add spec line for Beasley B2 #32147weight 2022-03-01 P2 E&O Table 1 spec line wing terminology #32148aero 2022-03-01 P2 E&O class name #32196other 2022-03-01 STU Single TB Weight Modifiers #31449weight 2022-03-01 STU Request to Remove A4 1.8t from STU Spec Line Tables #31465weight 2022-03-01 STU Improved Touring Tires #32063tyres & wheels 2022-02-01 EP Throttle Body and Idle Air #31800induction 2022-02-01 EP Porsche 968 Engine Questions #31831engine 2022-02-01 EP Request weight reduction for 1979-1985 Mazda RX-7 #31833weight 2022-02-01 P2 E&O Engine section #31969engine 2022-02-01 STU Request Allowance for Balance Shaft Delete in STU #31434engine 2022-02-01 STU Request Louvers in hood vents #31916other 2022-01-01 EP Porsche 968 Engine Questions #31478induction 2022-01-01 EP PCS E. 2. n. 4. Add Axle Shaft to Allow FWD the Same Freedom #31592tyres & wheels 2022-01-01 EP BMW Z3 2.5L Spec Line #31724induction 2022-01-01 P2 E&O letter #31539 – Control Area definition #31783tyres & wheels 2022-01-01 STU Request to Add Honda K23 Spec Line #30682cars added 2022-01-01 STU RE: Aug FT letter 30682 #31060other 2022-01-01 STU Throttling Device Clarification #31323induction 2021-12-01 EP 944S2 Restrictor #31396induction 2021-12-01 EP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars added 2021-12-01 P2 BoP adjustment effective 1-1-22 #31538engine 2021-12-01 P2 E&O clarification of "Control Area" definition #31539tyres & wheels 2021-10-01 EP E&O; MR2 Track #31120wording
	Indianapolis Motor Speedway Runoffs 20212021-09-25	1:33.235Tim Day Jr · fastest of 16 · top 5 within 3.3s+1.409s (+1.53%)	1:35.322Tim Day Jr · fastest of 10 · top 5 within 4.8s+2.841s (+3.07%)	150.3Robert Iversen	1:47.078Joe Moser · fastest of 30 · top 5 within 2.0s-1.843s (-1.69%)	1:47.441Joe Moser · fastest of 28 · top 5 within 1.8s-1.946s (-1.78%)	146.9Kip VanSteenburg	+12.119squal +13.843s	112.7%qual 114.8%	1:48.181Jesse Prather · fastest of 31 · top 5 within 3.2s-1.416s (-1.29%)	1:49.928Jesse Prather · fastest of 27 · top 5 within 0.9s-0.468s (-0.42%)	143.4Jon Brakke	+14.606squal +14.946s	115.3%qual 116.0%
34 rule changes (P2: 8, STU: 12, EP: 14)9 weight · 6 engine · 4 cars added · 3 suspension & brakes · 3 tyres & wheels · 2 induction · 1 aero · 2 wording · 4 othershowhide 2021-09-01 P2 P2 CN Engine Rebuild Clarification #31000engine 2021-08-01 EP Request to Allow F22c Engine for 2000-2003 Honda S2000 #30548engine 2021-08-01 EP Request a review of the S14 240SX in EP. #30873weight -200 lbs 2021-08-01 P2 F5 P2 Conversion #30856other 2021-08-01 P2 Clarify minimum body width requirement #30859tyres & wheels 2021-07-01 EP Lotus/Caterham 7 America Request #30392engine 2021-07-01 EP Reclassify Daimler SP 250 #30721cars added 2021-07-01 STU STU Fender flares #30696tyres & wheels 2021-07-01 STU Request weight reduction for 12A bridgeport motor in Miata #30751weight -200 lbs 2021-06-01 EP Clarify Application of Percentage Based Weight Penalties #30669weight 2021-05-01 EP Change Classification of 84-87 Mazda 626 from FP to HP #30350cars added 2021-05-01 EP Fiat X1/9 brake rotors #30423suspension & brakes 2021-05-01 EP NC MX-5 year range correction E&O #30503wording 2021-05-01 P2 E&O tonneau cover provision in cockpit opening section #30459other 2021-05-01 P2 Remove effective dates in Table 1 #30468other 2021-05-01 P2 E&O Maximum Valves Per Cylinder #30560engine 2021-05-01 STU Request for Fender Flare Clarification #30375weight 2021-04-01 EP Please Classify Mazda3 in FP #30165cars added 2021-04-01 STU Provision for Interchangeable Engine Components Already Allowed #30342engine 2021-04-01 STU ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording 2021-03-01 P2 Add a new spec line for a 2-cycle, 3-cylinder engine up to 820cc #30272engine 2021-03-01 STU Super Touring Alternate Miata Hubs #30345tyres & wheels 2021-02-01 STU Brake Component Relocation #29990suspension & brakes 2021-02-01 STU Porsche PDK #30081weight 2021-02-01 STU Reference Letter #29333 Proposed STU 13B Spec Line Changes #30086weight 2021-02-01 STU Drive Shaft Request #30087other 2021-01-01 EP Alternate Front Brake Rotors and Calipers for EP AH 3000 #29893suspension & brakes 2021-01-01 STU 13B Rules Adjustment #29333cars added 2020-12-01 EP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines #29195weight -50 lbs 2020-12-01 EP Correct Wording for Level 1 and Level 2 Induction Systems #29406induction 2020-12-01 EP Weight Reduction for Datsun Roadster #29409weight -75 lbs 2020-12-01 EP EP TR8 Adjustment #29512weight -100 lbs 2020-12-01 P2 Balance of Performance adjustments effective 01-01-2021 #29822induction 2020-12-01 STU Request clarification on wing measurement #29640aero
	Road America Runoffs 20202020-10-02	2:08.514Robert Iversen · fastest of 12 · top 5 within 3.0s	2:09.793Robert Iversen · fastest of 12 · top 5 within 3.9s	153.1Robert Iversen	2:27.883David Fiorelli · fastest of 14 · top 5 within 4.1s	2:28.410Anthony Geraci · fastest of 14 · top 5 within 3.1s	144.2David Fiorelli	+18.617squal +19.369s	114.3%qual 115.1%	2:27.322Jesse Prather · fastest of 20 · top 5 within 2.5s	2:29.047Jesse Prather · fastest of 20 · top 5 within 2.8s	141.7Jesse Prather	+19.254squal +18.808s	114.8%qual 114.6%
37 rule changes (P2: 6, STU: 17, EP: 14)13 induction · 9 engine · 5 weight · 3 aero · 3 cars added · 1 suspension & brakes · 1 tyres & wheels · 1 wording · 1 othershowhide 2020-10-01 EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheels 2020-09-01 P2 E&O clarification of P2 rear wing requirements #29205aero 2020-09-01 STU Request for Advanced Aero Rule Wording Clarification. #29124aero 2020-08-01 EP EP BMW Z3 Rule Clarification #28998engine 2020-08-01 STU Minimum Weight Determination #27695weight 2020-08-01 STU ST Gurney flap Wicker clarification #29012aero 2020-07-01 EP Request to Classify Porsche 911 2.0L #28456cars added 2020-07-01 STU Request for Alternate Intake Manifold #26514induction 2020-07-01 STU Request for Addition to GT3 Approved Turbo List #27576induction 2020-07-01 STU Request BoP for my Car #29004induction 2020-07-01 STU Sequential Shifters in STU #29031other 2020-06-01 EP BMW Cylinder Head Casting and Part Numbers #28708engine 2020-06-01 P2 Classify Elan NP01 in P2 Table 1 #28812cars added 2020-06-01 STU Rotary Help #27833weight 2020-05-01 EP Request to Classify 1990-1994 Mazda Protege #28381cars added 2020-05-01 EP Error in Mini Cooper Spec Line #28713wording 2020-05-01 P2 SCCA Enterprises ESR / P2 engine restrictor testing #28669induction 2020-04-01 EP Caterham 7 Spec Line #28498engine 2020-04-01 P2 Add ESR inlet restrictor #27869induction 2020-04-01 STU Request to approve Honda S2000 HKS supercharger #27281engine 2020-04-01 STU Request BoP on the Lotus #27637weight +100 lbs 2020-04-01 STU Turbo Inlet Restrictor On MK5 Volkswagen #27704induction 2020-04-01 STU Honda K20C1 removal #27732induction 2020-04-01 STU Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine 2020-04-01 STU Alternate Engine for Porsche 944 #28259engine 2020-03-01 EP Request to Review Horsepower Parity #27662induction 2020-03-01 EP E36 (92-95) Brakes Errors and Omissions #28058suspension & brakes 2020-03-01 EP Request to allow 40 DCOE carb for the Datsun 510 #28195induction 2020-03-01 EP Add Throttle Body Size these EP BMW Spec Lines #28422induction 2020-03-01 P2 Request for Fly by Wire Rule Wording Change #28247engine 2020-03-01 STU Please Modify the STU Wheel Size Rule for Clarity #27694weight 2020-03-01 STU Turbo Engine Cars Base Weight #28032weight 2020-02-01 EP Request for Help for Datsun 1200 #27934induction 2020-01-01 EP Request to List Mazda Miata Throttle Body Size #27907induction 2020-01-01 P2 Request for addition of BMW Engine in P2 Engine Table #27821engine 2019-12-01 EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661engine 2019-12-01 STU Request for an electronic throttle body #27342induction
	Virginia International Raceway Runoffs 20192019-10-05	1:49.111Robert Iversen · fastest of 14 · top 5 within 0.8s	1:50.258Greg Gyann · fastest of 13 · top 5 within 0.4s	149.4Robert Iversen	1:59.948Kevin Boehm · fastest of 25 · top 5 within 3.5s	2:00.483Kevin Boehm · fastest of 25 · top 5 within 2.5s	143.8Kevin Boehm	+10.225squal +10.837s	109.3%qual 109.9%	2:00.987Jesse Prather · fastest of 29 · top 5 within 2.2s	2:01.631Jesse Prather · fastest of 24 · top 5 within 1.4s	147.5Kip Van Steenburg	+11.373squal +11.876s	110.3%qual 110.9%
41 rule changes (P2: 9, STU: 22, EP: 10)10 induction · 8 weight · 6 engine · 4 cars added · 3 aero · 3 suspension & brakes · 3 tyres & wheels · 2 wording · 2 othershowhide 2019-10-01 P2 Update Engine Table Line E notes #27414engine 2019-08-31 EP Request bodywork for Austin Healey Bugeye Sprite MK1 #27106other 2019-08-31 EP Request to classify the GMX5 2019 #27263cars added 2019-08-31 EP level one susp. component rule #27270suspension & brakes 2019-08-31 EP Clarification of Carb Rules - Prep 1 #27300induction 2019-08-31 EP Clarification of Carb Rules - Prep 2 #27301induction 2019-08-31 P2 Update P2 Engine Table spec lines to reflect 3/1/2019 #27254engine 2019-08-31 STU Request to correct E&O advanced aerodynamics #27290aero 2019-08-01 EP Request Miata Eligibility - 2003 #27121other 2019-07-01 P2 E&O Transmissions #27006tyres & wheels 2019-07-01 STU Remove -2mm penalty from SR20DET Nissan #26982weight 2019-07-01 STU Request clarification for manifold and throttle in STU #27004induction 2019-06-01 P2 Request to restrict all cars #26246weight 2019-05-31 STU Request to clarify afterrmarket side skirts exhaust exit #26814suspension & brakes 2019-05-31 STU Wheel Flare wording #26872tyres & wheels 2019-05-01 EP Allow Firewall Modification for Fitment of 13B into RX8 #26726engine 2019-05-01 STU Request Ride Height Clarification #26597suspension & brakes 2019-04-01 EP Rollcenter Correction Clarification #25873tyres & wheels 2019-04-01 EP Hardtops #26476wording 2019-04-01 STU Request to Use Japanese Mazda 13b Intake Manifold #25790induction 2019-04-01 STU Request Alternate Intake for Mazda MZR In a Rear Wheel Drive App. #26352induction 2019-04-01 STU E&O Suspension #26424wording 2019-04-01 STU Revisit B20 VTEC #26530cars added 2019-04-01 STU Move Flared Fenders to STU Advanced Aero #26564aero 2019-04-01 STU TCA Civic SI E&O #26606induction 2019-04-01 STU S54 Spec line #26620weight 2019-03-01 EP Request for Competition Adjustment for 2nd Generation RX7 #25935weight -50 lbs 2019-03-01 P2 Change Engine Table Lines B.1 & B.5 #25777engine 2019-03-01 P2 Change Line A.1 restrictor size #26429induction 2019-03-01 STU Request to Class Assignment for 2017 Civic #24287cars added 2019-03-01 STU Request to run E46 3246cc in STU #25126weight 2019-03-01 STU Engine Classification for Rotary #25564engine 2019-03-01 STU K24/K20 Head Swap Clarification/Amendment #25899induction 2019-03-01 STU Request to Classify 12a Bridge Ported Rotary Engine #25985cars added 2019-03-01 STU World Challenge Car Eligibility #26387weight 2019-03-01 STU Request a phone call for discussion regarding weight #26398weight 2019-03-01 STU Advanced Aero E&O #26413aero 2019-01-01 P2 Request to Allow 1345cc Hayabusa Engines for Spec Line P2 Cars #25595engine 2019-01-01 P2 Change CN inlet restrictor implementation date #25816induction 2019-01-01 P2 Clarify Honda K20A-FD2 parts requirement #25950weight 2019-01-01 STU Request to Equalize Direct Injected Turbo Cars #24890induction
	Sonoma Raceway Runoffs 20182018-10-10	1:28.784Tim Day Jr · fastest of 17 · top 5 within 5.0s	1:32.071Chuck Bona · fastest of 18 · top 5 within 0.9s	144.4Tim Day Jr	1:19.234Franklin Church · fastest of 10 · top 5 within 21.5s	1:46.514Kevin Boehm · fastest of 9 · top 5 within 7.4s	103.0Franklin Church	+14.443squal -9.550s	115.7%qual 89.2%	1:45.828Glen McCready · fastest of 18 · top 5 within 4.3s	1:46.518Glen McCready · fastest of 16 · top 5 within 2.8s	106.5Aaron Downey	+14.447squal +17.044s	115.7%qual 119.2%
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25	1:31.826Jeff Shafer · fastest of 26 · top 5 within 4.9s	1:32.481Jeff Shafer · fastest of 24 · top 5 within 3.8s		1:48.921Rob Huffmaster · fastest of 34 · top 5 within 2.0s	1:49.387Rob Huffmaster · fastest of 31 · top 5 within 2.4s		+16.906squal +17.095s	118.3%qual 118.6%	1:49.597Matt Reynolds · fastest of 44 · top 5 within 1.2s	1:50.396Matt Reynolds · fastest of 45 · top 5 within 0.5s		+17.915squal +17.771s	119.4%qual 119.4%
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19	1:20.188Jeff Shafer · fastest of 18 · top 5 within 4.0s	1:20.904Jeff Shafer · fastest of 16 · top 5 within 2.2s		1:32.738Joe Moser · fastest of 16 · top 5 within 2.5s	1:34.597Cameron Maugeri · fastest of 16 · top 5 within 0.8s		+13.693squal +12.550s	116.9%qual 115.7%	1:33.847Michael Galati · fastest of 25 · top 5 within 0.8s	1:34.266Michael Galati · fastest of 23 · top 5 within 1.3s		+13.362squal +13.659s	116.5%qual 117.0%
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21	1:51.825Chris Farrell · fastest of 17 · top 5 within 3.6s	1:52.355Jeff Shafer · fastest of 17 · top 5 within 2.8s		2:05.494Eric Heinrich · fastest of 18 · top 5 within 4.6s	2:06.756Eric Heinrich · fastest of 17 · top 5 within 3.5s		+14.401squal +13.669s	112.8%qual 112.2%	2:03.794Kip Van Steenburg · fastest of 29 · top 5 within 3.2s	2:05.109Kip Van Steenburg · fastest of 28 · top 5 within 3.3s		+12.754squal +11.969s	111.4%qual 110.7%

By track

Track	Events	Typical % of P2	Best	Latest
Road America	4	100.0%3 of 4 with P2	100.0%Runoffs 2020	100.0%Runoffs 2026
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 P2'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.