BoP Lab / Classes / FX

FX vs FE2 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 +EP +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 Barber Motorsports Park Buttonwillow Raceway Park Circuit of the Americas Hallett Motor Racing Circuit Indianapolis Motor Speedway Laguna Seca Michelin Raceway Road Atlanta Mid-Ohio Sports Car Course NOLA Motorsports Park Pittsburgh International Race Complex Portland International Raceway Road America Sebring International Raceway Sonoma Raceway Virginia International Raceway Watkins Glen International 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

% of FXLap times

FXFE2solid race · dashed qualifying · slower is lower

FXFE2solid 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
	Event	Qual best	Race best	Trap	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 rule changes (FX: 1, FE2: 1)1 engine · 1 othershowhide 2026-08-01 FX Update sealed engine teardown section #40622engine 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 rule changes (FX: 1, FE2: 1)1 weight · 1 othershowhide 2025-04-01 FE2 Driver Safety & Comfort #37965other 2024-12-01 FX Request to Change to Weight for Ligier JS F422 #37124weight -15 lbs
	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%)
4 rule changes (FX: 4)1 tyres & wheels · 1 weight · 2 othershowhide 2024-07-01 FX Adjust minimum weights to align with pro F4 rules #36221weight -15 lbs 2024-04-01 FX Add Classification for 2nd Gen Ligier JS F422 #35844other 2024-03-01 FX Clarify Formula 4 Rules in FX #35700tyres & wheels 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%)
3 rule changes (FX: 3)2 weight · 1 othershowhide 2023-06-01 FX USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC #34329weight 2023-02-01 FX E&O - Remove references to FB and FM in GCR section 1.4.2.D #33725other 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%
9 rule changes (FX: 9)4 tyres & wheels · 2 engine · 2 weight · 1 inductionshowhide 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 2022-02-01 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
	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%
5 rule changes (FX: 5)2 cars added · 2 tyres & wheels · 1 inductionshowhide 2021-08-01 FX Rules Adjustment #30950tyres & wheels 2021-06-01 FX FX/FRP Tire Rule #30723tyres & wheels 2021-05-01 FX Classify the 2000-2009 Formula Renault 2.0 / Fran-Am 2000 #30460cars added 2021-01-01 FX Request for Car Classification to Compete in Formula X #29933cars added 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%
8 rule changes (FX: 6, FE2: 2)3 cars added · 1 induction · 1 tyres & wheels · 1 weight · 1 wording · 1 othershowhide 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 2020-07-01 FX Request to be added to FX group #28991other 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 FX Request to remove tire marking language from FM #28415tyres & wheels 2020-02-01 FX Change to FX Table 1 #28322induction 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
No rule changes on record between these events
	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

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	1	100.0%	100.0%Runoffs 2021	100.0%Runoffs 2021
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.