BoP Lab / Classes / P2

P2 vs T1 vs SMX 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 +EP +FA +FC +FE2 +FF +FP +FV +FX +GT1 +GT2 +GTX +HP +P +P2×SM +vsSMX ×SRF3 +STL +STU +vsT1 ×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 · T1 100.2% of P2 Andrew Aquilante, Virginia International Raceway Runoffs 2022 race · SMX 119.8% of P2 Skyler Cottrell, Road America Runoffs 2026 qualifying

% of P2Lap times

P2T1SMXsolid race · dashed qualifying · slower is lower

P2T1SMXsolid 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			T1					SMX
	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%)						2:36.472Skyler Cottrell · fastest of 21 · top 5 within 0.4s+0.240s (+0.15%)	2:36.414Cam Ebben · fastest of 21 · top 5 within 1.1s-0.677s (-0.43%)	128.4Christian Hoagland-0.6 mph (-0.5%)	+26.973squal +25.866s	120.8%qual 119.8%
14 rule changes (T1: 12, SMX: 2)3 induction · 3 weight · 2 tyres & wheels · 1 removed · 1 wording · 4 othershowhide 2026-07-01 SMX Rear Toe Link #40271other 2026-07-01 T1 Tire Equality #40342tyres & wheels 2026-06-01 T1 Trunk Lid Wording #40177tyres & wheels 2026-05-01 T1 Clarification on Request #39716 T1 (Spec Line #1139) #39924induction 2026-05-01 T1 Mistake in Line 1430 #39958other 2026-04-01 SMX Part Number Change Request #39914wording 2026-04-01 T1 Spec line #1139 Restrictor Change Request #39922induction 2026-03-01 T1 Replace OEM Heat Exchanger (Intercooler) With Aftermarket #39542other 2026-02-01 T1 LS1 into Corvette C6 Spec Line Request #39716weight 2026-01-01 T1 additional T1 adjustment #39520induction 2025-12-01 T1 Keep S2000 Classification #39344other 2025-12-01 T1 Correcting and updating T1 GT4 spec lines #39394weight 2025-12-01 T1 BOP adjustments to non GT4 T1 cars #39406weight +100 lbs 2025-12-01 T1 Remove T1 Spec Line #39407removed
	Road America Runoffs 20252025-09-29				2:20.677James Candelaria · fastest of 5 · top 5 within 5.9s+4.099s (+3.00%)	2:21.612Drew Delmonico · fastest of 5 · top 5 within 11.8s+5.481s (+4.03%)	163.6Drew Delmonico+5.7 mph (+3.6%)			2:36.232Cam Ebben · fastest of 20 · top 5 within 0.2s+0.581s (+0.37%)	2:37.091Michael Tinis · fastest of 19 · top 5 within 0.3s+0.813s (+0.52%)	129.1Camden Gruber-0.4 mph (-0.3%)
25 rule changes (P2: 1, T1: 19, SMX: 5)8 weight · 4 cars added · 4 tyres & wheels · 3 engine · 1 induction · 1 wording · 4 othershowhide 2025-06-01 SMX SMX Data Submission - Penalties #38248other 2025-06-01 SMX SMX Penaly Clarification updated language #38337wording 2025-05-01 SMX Clarify Tire Marking Regs #38004tyres & wheels 2025-05-01 SMX SMX Data Submission Timeframe #38039other 2025-05-01 T1 Acceptance of Porsche 981 GT4 Clubsport into T1 #36664cars added 2025-05-01 T1 Request to Restore T1 Honda S2000 to Proper Weights #37644weight -50 lbs 2025-05-01 T1 DCT Transmission in E46 #37964other 2025-05-01 T1 Reduce E92 M3 Minimum Weight to 3050 #38092weight 2025-05-01 T1 Finalize Spec Line for T1 Darkhorse #38106weight 2025-04-01 T1 Cadillac CT4-V Blackwing #38003cars added 2025-03-01 T1 Correct and make new T1 BOP adjustments. #37737weight +75 lbs 2025-02-01 T1 T1 Parity Compared to GT4 #37170weight +125 lbs 2025-02-01 T1 Clarification of Request Approval #37273 #37399engine 2025-02-01 T1 C8 Corvette Facts #37400weight -100 lbs 2025-02-01 T1 Camaro Gen 5 Competitive Disadvantage #37440induction 2025-02-01 T1 Tire Changes in the Rules for GT4 #37497tyres & wheels 2024-12-01 P2 2000 cc Pinto Engine Car Weight #37187weight 2024-12-01 SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other 2024-12-01 T1 Changes to T1 Tires for GT4 and Other Cars #35383tyres & wheels 2024-12-01 T1 G82 M4 GT4 inclusion in T1 #35864cars added 2024-12-01 T1 Alt. Clutch Allowance #36606engine 2024-12-01 T1 BOP Changes Need Updates #36667weight -150 lbs 2024-12-01 T1 Request Ford Performance Darkhorse R in T1 #37136cars added 2024-12-01 T1 Car Mods for T1 Corvette under line item 1150 #37173tyres & wheels 2024-12-01 T1 Increased Bore Throttle Bodies for E46 M3 S54 Engine #37273engine
	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%)	2:16.578Andrew Aquilante · fastest of 8 · top 5 within 4.8s-1.068s (-0.78%)	2:16.131Andrew Aquilante · fastest of 7 · top 5 within 4.0s-2.570s (-1.85%)	157.9Andrew Aquilante-0.8 mph (-0.5%)	+7.809squal +9.173s	106.1%qual 107.2%	2:35.651Ethan Lampe · fastest of 23 · top 5 within 0.7s	2:36.278Ethan Jacobs · fastest of 22 · top 5 within 0.7s	129.5Michael Borden	+27.956squal +28.246s	121.8%qual 122.2%
22 rule changes (P2: 5, T1: 13, SMX: 4)6 cars added · 6 engine · 2 induction · 2 weight · 1 suspension & brakes · 1 tyres & wheels · 1 wording · 3 othershowhide 2024-09-01 SMX SMX Camera Rule Correction #36496wording 2024-09-01 SMX AIM ECU Protocol #36556engine 2024-09-01 SMX OE versus OEM Definitons #36608other 2024-09-01 SMX Shifter Bushing #36611suspension & brakes 2024-05-01 P2 CN Spec ECU #35835engine 2024-05-01 P2 E&O - Correct FIA Group CN spec line notes #35900tyres & wheels 2024-05-01 T1 Please Expedite classing the C63 Mercedes #35987cars added 2024-04-01 T1 Honda S2000 #35582cars added 2024-03-01 T1 9.1.9.1 T1 new category item/ line 26 rule to expire Jan 1 2023 #35411cars added 2024-02-01 T1 C8 Corvette T1 Restrictor Plate Request #35213induction 2024-02-01 T1 The Cars Have Expired #35379induction 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 2024-01-01 T1 GT4 batch adjustment in T1 #35162weight -85 lbs 2024-01-01 T1 Remove T1 spec lines #35192other 2023-12-01 P2 Correct Table 1 for Engine Date Range Specifications #35182engine 2023-12-01 T1 New T1 add spec line for C5 corvette LS2 engines (Copy from C6) #33764engine 2023-12-01 T1 C7 Corvette Rule Change Request #34897cars added 2023-12-01 T1 Camaro Gen 5 Weight Reduction Due to Competitive Disadvantage #35092weight -75 lbs 2023-12-01 T1 Addendum to Letter #35022: Drivetrain Rule #35105other 2023-12-01 T1 2004 - 2006 Pontiac GTO Re-Integration Back Into T1 #34403cars added 2023-12-01 T1 Request to Classify Porsche 997-1 GT3 Cup #34561cars added
	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%)	1:54.520Andrew Aquilante · fastest of 12 · top 5 within 3.7s-0.370s (-0.32%)	1:55.488Andrew Aquilante · fastest of 12 · top 5 within 2.7s-20.579s (-15.12%)	159.2James Candelaria+1.6 mph (+1.0%)	+6.659squal +5.930s	106.1%qual 105.5%	2:11.435Nathan Nicholson · fastest of 18 · top 5 within 0.6s	2:12.616Noah Harmon · fastest of 16 · top 5 within 0.1s	127.8Noah Harmon	+23.787squal +22.845s	121.9%qual 121.0%
27 rule changes (P2: 8, T1: 19)6 weight · 4 cars added · 4 engine · 3 tyres & wheels · 2 induction · 1 aero · 1 removed · 3 wording · 3 othershowhide 2023-08-01 T1 Why no Camaro? #34421cars added 2023-08-01 T1 Request to Remove Expiration from T1 spec lines #1350 & #1370 #34470other 2023-08-01 T1 Remove #34475other 2023-08-01 T1 Error in T1 GT4 numbering scheme- #34578wording 2023-08-01 T1 C5 Approved Aero That Was Mistakenly Deleted #34374aero 2023-07-01 T1 Viper Cleanup #34107induction 2023-07-01 T1 Viper 8300 OEM FPR Size #34268induction 2023-07-01 T1 Ford Mustang S197 (05-14) Clarification #34450wording 2023-07-01 T1 Gen 5 Camaro Engine #33875engine 2023-07-01 T1 Inquiry to letter #33682 #34071engine 2023-06-01 T1 Request to reinstate T1 S197 Mustang #34048cars added 2023-05-01 P2 Clarify minimum side body height requirement #34143tyres & wheels 2023-05-01 P2 Clarify closed cockpit single seat car allowance #34144wording 2023-05-01 T1 T1 GT4 adjustments #33786other 2023-05-01 T1 Touring 1 Tire Sizes #34191tyres & wheels 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 T1 Clarification for Camaro Gen5 2010-2015 #33739cars added 2023-03-01 T1 Sequential Gearbox Limitations in T1 #33691weight 2023-03-01 T1 T1 GT4 adjustments #33786weight 2023-03-01 T1 Sunset of pre 2023 Touring 1 Rules. #33916removed 2023-02-01 T1 Corrections to T1 Spec Lines #33678tyres & wheels 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 2023-01-01 T1 GT4 section to Current T1 Rules. #33632weight
	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%)	1:54.890Andrew Aquilante · fastest of 10 · top 5 within 3.2s+0.119s (+0.10%)	2:16.067Andrew Aquilante · fastest of 8 · top 5 within 15.9s+1.654s (+1.23%)	157.5Mark Boden+1.3 mph (+0.8%)	+0.233squal +7.324s	100.2%qual 106.8%
21 rule changes (P2: 10, T1: 11)6 weight · 3 tyres & wheels · 2 cars added · 2 engine · 1 aero · 1 induction · 1 suspension & brakes · 2 wording · 3 othershowhide 2022-08-01 T1 Correct Camaro Spec Line From Letter #30791 response to 3475lbs #32824weight -25 lbs 2022-06-01 T1 Fix FP350S limited prep and Shelby 350 full prep issues #31680induction 2022-06-01 T1 Request to Classify AMG GT4 #32610cars added 2022-05-01 P2 E&O Clarification of Chassis Construction Requirements #32469tyres & wheels 2022-05-01 P2 Clean up P2 wording #32525wording 2022-04-01 P2 After Market to Aftermarket #32373other 2022-04-01 T1 Viper/Z06 Parity #31942weight -50 lbs 2022-04-01 T1 Discrepancy in T1 allowances #32293other 2022-04-01 T1 T1 RX7 classification #32352cars added 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 T1 Weight reduction E&O #30791weight -25 lbs 2022-03-01 T1 Performance Adjustment Request for Camaro #31521weight -50 lbs 2022-03-01 T1 Remove 33m Brake rotor thickness rule #31954suspension & brakes 2022-02-01 P2 E&O Engine section #31969engine 2022-01-01 P2 E&O letter #31539 – Control Area definition #31783tyres & wheels 2021-12-01 P2 BoP adjustment effective 1-1-22 #31538engine 2021-12-01 P2 E&O clarification of "Control Area" definition #31539tyres & wheels 2021-12-01 T1 Turbo Miata Help #31315weight +200 lbs 2021-12-01 T1 Fix the T1 Corvette heading #31528wording
	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	1:42.292Andrew Aquilante · fastest of 22 · top 5 within 1.3s+0.499s (+0.49%)	1:43.752Mark Boden · fastest of 22 · top 5 within 1.0s+0.881s (+0.86%)	159.2Mark Boden	+8.430squal +9.057s	108.8%qual 109.7%
26 rule changes (P2: 8, T1: 18)6 engine · 4 cars added · 3 weight · 2 induction · 1 aero · 1 suspension & brakes · 1 tyres & wheels · 1 wording · 7 othershowhide 2021-09-01 P2 P2 CN Engine Rebuild Clarification #31000engine 2021-08-01 P2 F5 P2 Conversion #30856other 2021-08-01 P2 Clarify minimum body width requirement #30859tyres & wheels 2021-08-01 T1 T1 E46 BOP E&O for Letter # 29970 #30934weight +100 lbs 2021-07-01 T1 Request BoP for the Viper in 1 LP #29968other 2021-07-01 T1 LS6 Alternative Head Question #30074engine 2021-06-01 T1 T1-LP - Add Performance Pack, Bullet, Mach 1 to 18+ Mustang #29849induction 2021-06-01 T1 Request BoP for the Viper in 1 LP #29968other 2021-06-01 T1 Request to classify C7 and 13Viper in T1 LP #29969cars added 2021-06-01 T1 Request LP Z06 steel chassis #30589other 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 T1 Request For Reduction in Weight/Penalties for Camaro #30443weight 2021-05-01 T1 Fix dry sump Contradictions in T1-LP vs T2 #30596suspension & brakes 2021-03-01 P2 Add a new spec line for a 2-cycle, 3-cylinder engine up to 820cc #30272engine 2021-03-01 T1 T1 LP Aero adjustments #30196aero 2021-02-01 T1 Request to Clarify Miller Mustang Classification #28728engine 2021-02-01 T1 BMW E46 Carbon Dash #29806engine 2021-02-01 T1 Request to Update T1 Mustang Spec Line #30001other 2021-02-01 T1 Dodge Viper 8400 OEM??? #30174cars added 2021-02-01 T1 Class BMW M2CS Club Sport #30195cars added 2021-02-01 T1 997.1 GT3 Cup #30229cars added 2021-01-01 T1 Correct T1 Limited Prep Years #29708wording 2020-12-01 P2 Balance of Performance adjustments effective 01-01-2021 #29822induction 2020-12-01 T1 Changes to Corvette C8 #29898weight -100 lbs
	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	2:17.646Andrew Aquilante · fastest of 15 · top 5 within 3.7s	2:18.701Mark Boden · fastest of 14 · top 5 within 3.0s	158.8James Candelaria	+8.908squal +9.132s	106.9%qual 107.1%
19 rule changes (P2: 6, T1: 13)4 aero · 3 engine · 3 induction · 3 suspension & brakes · 2 cars added · 2 weight · 1 tyres & wheels · 1 wordingshowhide 2020-09-01 P2 E&O clarification of P2 rear wing requirements #29205aero 2020-08-01 T1 Touring Gurney flap wicker clarification #29013aero 2020-06-01 P2 Classify Elan NP01 in P2 Table 1 #28812cars added 2020-06-01 T1 Consider coil spring conversion Corvette in T2 #28824suspension & brakes 2020-05-01 P2 SCCA Enterprises ESR / P2 engine restrictor testing #28669induction 2020-05-01 T1 Additional Clarification on 996 Cup in T1 From Letter #28040 #28060wording 2020-05-01 T1 Request SPEC Corvette Rear Spolier #28182aero 2020-05-01 T1 T1 Rear Brake Rotor Size Exemption for Gen 5 Camaro #28402suspension & brakes 2020-04-01 P2 Add ESR inlet restrictor #27869induction 2020-04-01 T1 Request 996 GT3 Trunk for Wing Allowance. #28153aero 2020-04-01 T1 All Touring, Change DOT Tire Language 9.1.9.1, 9.3.45 #28452tyres & wheels 2020-03-01 P2 Request for Fly by Wire Rule Wording Change #28247engine 2020-03-01 T1 Request for E46 wagon with S54 engine in T1 #27427engine 2020-02-01 T1 Request to include Subaru WRX/STI 02-18 in T1 #24916induction 2020-02-01 T1 Request Ford Mustang FP350S T1-LP weight and restrictor change #26662weight +100 lbs 2020-02-01 T1 Request to classify Ford Coyote 3rd Gen OEM #27145cars added 2020-02-01 T1 Request alternate dashboard #27276weight 2020-02-01 T1 Request for Allowance of Coil Springs on Limited Prep C6 Corvette #27713suspension & brakes 2020-01-01 P2 Request for addition of BMW Engine in P2 Engine Table #27821engine
	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	1:54.771Andrew Aquilante · fastest of 19 · top 5 within 3.1s	2:14.413Andrew Aquilante · fastest of 15 · top 5 within 4.8s	156.2Mark Boden	+24.155squal +5.660s	121.9%qual 105.2%
28 rule changes (P2: 9, T1: 19)8 weight · 6 cars added · 4 engine · 3 induction · 2 suspension & brakes · 2 tyres & wheels · 1 aero · 1 wording · 1 othershowhide 2019-10-01 P2 Update Engine Table Line E notes #27414engine 2019-08-31 P2 Update P2 Engine Table spec lines to reflect 3/1/2019 #27254engine 2019-08-31 T1 T1 LP 2016 Camaro and Later #27198weight -100 lbs 2019-08-01 T1 Request to return Ford Mustang Challenge Car to T1 #26751cars added 2019-08-01 T1 Correct years in T1 FP Corvette spec #27023wording 2019-07-01 P2 E&O Transmissions #27006tyres & wheels 2019-07-01 T1 Request BoP Baten - T1 Camaro - Follow up to Letter # 26145 #26900induction 2019-06-01 P2 Request to restrict all cars #26246weight 2019-05-31 T1 Clarify DOT tires touring #26556tyres & wheels 2019-05-01 T1 Request to Classify EcoBoost Mustang #25841cars added 2019-05-01 T1 Request Corvette aerodynamic aids #26265aero 2019-05-01 T1 Audi TTRS VTS Documentation Revision #26578other 2019-05-01 T1 Request Ride Height Clarification #26599suspension & brakes 2019-05-01 T1 Opposes Unfair weight and throttle restrictor #26719weight -300 lbs 2019-04-01 T1 Request to classify the Porsche 928GTS/S4 in Touring 1 #26315cars added 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 T1 Request Mustang GT Limited Prep 2018 Classification #24431cars added 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 T1 Class 2015+ Mustang GT350(R) #21466weight 2019-01-01 T1 Request to Classify Ford FP350S in T1-LP #25341cars added 2019-01-01 T1 Amendment to Request #25555 #25556suspension & brakes 2019-01-01 T1 Request to balance 996 v 997 T1 weight #25658weight 2019-01-01 T1 Request to Add PDK Transmission to 997 Porsche Spec Line #25668cars added 2019-01-01 T1 T1 World Challenge/Grand AM Spec Cars #25687weight 2019-01-01 T1 Add Clarification to Spec Car Classifications Vehicle Spec #25774weight
	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	1:39.970Kristofer Olson · fastest of 16 · top 5 within 3.8s	1:41.125Kristofer Olson · fastest of 15 · top 5 within 3.0s	108.6Brad McCall	+9.054squal +11.186s	109.8%qual 112.6%
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		1:41.793Andrew Aquilante · fastest of 22 · top 5 within 2.9s	1:42.871Andrew Aquilante · fastest of 21 · top 5 within 2.9s		+10.390squal +9.967s	111.2%qual 110.9%
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		1:28.656Ross Murray · fastest of 17 · top 5 within 1.4s	1:29.309Ross Murray · fastest of 15 · top 5 within 1.1s		+8.405squal +8.468s	110.4%qual 110.6%
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		1:53.562Andrew Aquilante · fastest of 12 · top 5 within 2.5s	1:55.494Andrew Aquilante · fastest of 12 · top 5 within 2.1s		+3.139squal +1.737s	102.8%qual 101.6%

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.