BoP Lab / Classes / FX

FX vs FE2 vs EP pace at every track

Lap times across years say as much about the weather as the class. % of FX is each class's best lap as a share of FX'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 +vsFE2 ×FF +FP +FV +FX×GT1 +GT2 +GTX +HP +P +P2 +SM +SMX +SRF3 +STL +STU +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: FX 100.0% of FX Jacob Loomis, Road America Runoffs 2020 race · FE2 96.9% of FX Owen McAllister, Road America Runoffs 2020 race · EP 107.6% of FX Jesse Prather, Road America Runoffs 2020 qualifying

% of FXLap times

FXFE2EPsolid race · dashed qualifying · slower is lower

FXFE2EPsolid race · dashed qualifying · each class's best lap as a share of FX's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	FX			FE2					EP
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs FX	% of FX	Qual best	Race best	Trap	vs FX	% of FX
	Road America Runoffs 20262026-09-28				2:12.326Franklin Futrelle · fastest of 8 · top 5 within 1.9s-0.149s (-0.11%)	2:11.881Franklin Futrelle · fastest of 8 · top 5 within 1.6s-1.458s (-1.09%)	143.5Steve Whitston-5.5 mph (-3.7%)			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%)
23 rule changes (FX: 1, FE2: 1, EP: 21)6 weight · 5 engine · 5 induction · 1 suspension & brakes · 1 tyres & wheels · 3 wording · 2 othershowhide 2026-08-01 EP Mini Cooper Compression Ratio #40517engine 2026-08-01 FX Update sealed engine teardown section #40622engine 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 2026-06-01 EP Honda S2000 Hardtop #40138other 2026-05-01 EP Miata track width - errors and omissions #39976wording 2026-05-01 EP Triumph GT6 Spec Change. #40098induction 2026-01-01 EP Request to Update E30 BMW Throttle Body Diameter Verbiage #39363induction 2025-12-01 EP TR2 Notes E&O #39180weight 2025-12-01 EP Balance of Power #39187weight +50 lbs 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 2025-10-01 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 2025-10-01 FE2 FE & FE2 Bubble Tail #38978other
	Road America Runoffs 20252025-09-29				2:12.475Franklin Futrelle · fastest of 11 · top 5 within 1.4s+0.969s (+0.74%)	2:13.339Franklin Futrelle · fastest of 10 · top 5 within 0.6s+0.591s (+0.45%)	149.0Steve Whitston+3.7 mph (+2.6%)			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%)
16 rule changes (FX: 1, FE2: 1, EP: 14)8 weight · 3 induction · 1 cars added · 1 wording · 3 othershowhide 2025-07-01 EP BMW Z4 update #38490induction 2025-07-01 EP EP Fiat 124 Spider Competition Adjustment Request #38498weight -50 lbs 2025-06-01 EP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -50 lbs 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 2025-04-01 FE2 Driver Safety & Comfort #37965other 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 2025-02-21 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 2024-12-01 EP Triumph GT6 Adjustments #37112weight 2024-12-01 FX Request to Change to Weight for Ligier JS F422 #37124weight -15 lbs 2024-11-01 EP 1275 HP Spridget Level 2 Only #36518other 2024-11-01 EP NA Miata Track Width Correction #36902wording
	Road America Runoffs 20242024-10-01				2:11.506Porter Aiken · fastest of 18 · top 5 within 0.5s-1.300s (-0.98%)	2:12.748Porter Aiken · fastest of 17 · top 5 within 2.0s-0.523s (-0.39%)	145.3Porter Aiken+1.9 mph (+1.3%)			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%)
18 rule changes (FX: 4, EP: 14)8 weight · 2 cars added · 2 engine · 1 induction · 1 tyres & wheels · 1 wording · 3 othershowhide 2024-08-01 EP Errant entry in HP production line item #36231other 2024-07-01 FX Adjust minimum weights to align with pro F4 rules #36221weight -15 lbs 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 2024-04-01 FX Add Classification for 2nd Gen Ligier JS F422 #35844other 2024-03-01 EP GCR Correction - Redundant HP Spec Lines #35623engine 2024-03-01 FX Clarify Formula 4 Rules in FX #35700tyres & wheels 2024-02-01 EP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weight 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 2023-12-01 EP Porsche 944/924S Rule Change Request #35002weight 2023-12-01 EP Triumph GT6 Adjustments #35054weight -30 lbs 2023-11-01 FX FM Rules Update #34841other
	Virginia International Raceway Runoffs 20232023-09-23				1:50.665Charles Russell Turner · fastest of 26 · top 5 within 2.3s-0.188s (-0.17%)	1:51.098Franklin Futrelle · fastest of 19 · top 5 within 1.4s-20.947s (-15.86%)	141.3Franklin Futrelle-0.6 mph (-0.4%)			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%)
16 rule changes (FX: 3, EP: 13)4 weight · 3 engine · 3 induction · 2 suspension & brakes · 1 wording · 3 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 2023-06-01 EP 914-6 Valve Size Correction #34185engine 2023-06-01 FX USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC #34329weight 2023-04-01 EP Investigate Parity of Z3 #33343induction 2023-02-01 FX E&O - Remove references to FB and FM in GCR section 1.4.2.D #33725other 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 2022-12-01 FX Reclassify 2010-2017 Formula Renault 2.0 as a spec line car in FA #33395weight
	Virginia International Raceway Runoffs 20222022-09-24	1:51.480Trevor A Russell · fastest of 5 · top 5 within 9.7s	2:08.711Dimitrios Tsesmetzis · fastest of 4 · top 4 within 6.8s	137.2Trevor A Russell	1:50.853Charles Russell Turner · fastest of 25 · top 5 within 1.1s-0.209s (-0.19%)	2:12.045Jason Conzo · fastest of 22 · top 5 within 1.8s+19.891s (+17.74%)	141.9Eric Cruz-0.6 mph (-0.5%)	+3.334squal -0.627s	102.6%qual 99.4%	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%)	+22.144squal +10.846s	117.2%qual 109.7%
30 rule changes (FX: 9, EP: 21)7 induction · 6 engine · 6 tyres & wheels · 5 weight · 3 cars added · 1 wording · 2 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 FX Pro Formula F2000/USF2000 Transmission E&O #32823weight 2022-08-01 FX Formula Mazda Minimum Weight #33010weight 2022-08-01 FX Formula Mazda Spec Line E&O Corrections #33011engine 2022-07-01 FX Formula Renault 2.0 (10-17) Intake Restrictor #32745induction 2022-07-01 FX Allow Performance Electronics PE3-8400 for USF2000 MZR #32767engine 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 2022-04-01 EP Mazda RX8 with 13b Rotary #32170induction 2022-04-01 EP Request Idle control valve clarification #32178engine 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 2022-02-01 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 FX FM Rule Set Clarification #31881tyres & wheels 2022-02-01 FX E&O F4 Tires #31940tyres & wheels 2022-02-01 FX E&O USF2000 Tube Frame #31951tyres & wheels 2022-02-01 FX URGENT - FX- Formula Renault Tire #32058tyres & wheels 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 2021-12-01 EP 944S2 Restrictor #31396induction 2021-12-01 EP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars added 2021-10-01 EP E&O; MR2 Track #31120wording
	Indianapolis Motor Speedway Runoffs 20212021-09-25	1:38.596Vaughn Glace · fastest of 15 · top 5 within 4.1s	1:38.833Vaughn Glace · fastest of 15 · top 5 within 4.3s	138.6Vaughn Glace	1:36.395Max Grau · fastest of 28 · top 5 within 0.7s	1:36.655Max Grau · fastest of 28 · top 5 within 0.7s	146.2Gray Fowler	-2.178squal -2.201s	97.8%qual 97.8%	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	+11.095squal +9.585s	111.2%qual 109.7%
19 rule changes (FX: 5, EP: 14)5 cars added · 5 weight · 2 engine · 2 induction · 2 suspension & brakes · 2 tyres & wheels · 1 wordingshowhide 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 FX Rules Adjustment #30950tyres & wheels 2021-07-01 EP Lotus/Caterham 7 America Request #30392engine 2021-07-01 EP Reclassify Daimler SP 250 #30721cars added 2021-06-01 EP Clarify Application of Percentage Based Weight Penalties #30669weight 2021-06-01 FX FX/FRP Tire Rule #30723tyres & wheels 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 FX Classify the 2000-2009 Formula Renault 2.0 / Fran-Am 2000 #30460cars added 2021-04-01 EP Please Classify Mazda3 in FP #30165cars added 2021-01-01 EP Alternate Front Brake Rotors and Calipers for EP AH 3000 #29893suspension & brakes 2021-01-01 FX Request for Car Classification to Compete in Formula X #29933cars 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 FX Update specifications for FormulaSPEED cars #29674induction
	Road America Runoffs 20202020-10-02	2:16.968Jacob Loomis · fastest of 12 · top 5 within 2.7s	2:17.553Jacob Loomis · fastest of 11 · top 5 within 3.5s	139.3Brad Drew	2:12.806Scott Rettich · fastest of 25 · top 5 within 0.6s	2:13.271Owen McAllister · fastest of 23 · top 5 within 0.7s	143.4Owen McAllister	-4.282squal -4.162s	96.9%qual 97.0%	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	+11.494squal +10.354s	108.4%qual 107.6%
22 rule changes (FX: 6, FE2: 2, EP: 14)6 induction · 5 cars added · 4 engine · 2 tyres & wheels · 1 suspension & brakes · 1 weight · 2 wording · 1 othershowhide 2020-10-01 EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheels 2020-09-01 FE2 FE/FE2 Oil Cooler #29293wording 2020-09-01 FX Follow up to to Letter#28991 Request for FX classification #29281cars added 2020-08-01 EP EP BMW Z3 Rule Clarification #28998engine 2020-07-01 EP Request to Classify Porsche 911 2.0L #28456cars added 2020-07-01 FX Request to be added to FX group #28991other 2020-06-01 EP BMW Cylinder Head Casting and Part Numbers #28708engine 2020-05-01 EP Request to Classify 1990-1994 Mazda Protege #28381cars added 2020-05-01 EP Error in Mini Cooper Spec Line #28713wording 2020-04-01 EP Caterham 7 Spec Line #28498engine 2020-04-01 FX Request to classify FSV in FX #28057cars added 2020-04-01 FX Classify FormulaSPEED in FX #28715cars added 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 FX Request to remove tire marking language from FM #28415tyres & wheels 2020-02-01 EP Request for Help for Datsun 1200 #27934induction 2020-02-01 FX Change to FX Table 1 #28322induction 2020-01-01 EP Request to List Mazda Miata Throttle Body Size #27907induction 2019-12-01 EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661engine 2019-12-01 FE2 FE / FE2 Update Rules #27624weight
	Virginia International Raceway Runoffs 20192019-10-05				1:51.062Liam Snyder · fastest of 20 · top 5 within 1.3s	1:52.154Liam Snyder · fastest of 19 · top 5 within 0.7s	142.6Robert Vanman			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
10 rule changes (EP: 10)2 induction · 1 cars added · 1 engine · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 1 wording · 2 othershowhide 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 2019-08-01 EP Request Miata Eligibility - 2003 #27121other 2019-05-01 EP Allow Firewall Modification for Fitment of 13B into RX8 #26726engine 2019-04-01 EP Rollcenter Correction Clarification #25873tyres & wheels 2019-04-01 EP Hardtops #26476wording 2019-03-01 EP Request for Competition Adjustment for 2nd Generation RX7 #25935weight -50 lbs
	Sonoma Raceway Runoffs 20182018-10-10				1:35.040Flinn Lazier · fastest of 9 · top 5 within 1.5s	1:35.563Flinn Lazier · fastest of 9 · top 5 within 1.7s	126.8Scott Rettich			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
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25									1:49.597Matt Reynolds · fastest of 44 · top 5 within 1.2s	1:50.396Matt Reynolds · fastest of 45 · top 5 within 0.5s
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19									1:33.847Michael Galati · fastest of 25 · top 5 within 0.8s	1:34.266Michael Galati · fastest of 23 · top 5 within 1.3s
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21									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

By track

Track	Events	Typical % of FX	Best	Latest
Road America	4	100.0%1 of 4 with FX	100.0%Runoffs 2020	100.0%Runoffs 2020
Virginia International Raceway	3	100.0%1 of 3 with FX	100.0%Runoffs 2022	100.0%Runoffs 2022
Indianapolis Motor Speedway	2	100.0%1 of 2 with FX	100.0%Runoffs 2021	100.0%Runoffs 2021
Daytona International Speedway	1	0 of 1 with FX
Mid-Ohio Sports Car Course	1	0 of 1 with FX
Sonoma Raceway	1	0 of 1 with FX

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 FX'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.