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FX vs P 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+FE2+FF+FP+FV+FX×GT1+GT2+GTX+HP+vsP×P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+Show 51 inactive classes
Series
Reference · what % is measured against
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Closest to the field: FX 100.0% of FX Jacob Loomis, Road America Runoffs 2020 race

1:401:502:002:102:205 rule changes between Runoffs 2020 and Runoffs 20215 ▾9 rule changes between Runoffs 2021 and Runoffs 20229 ▾15 rule changes between Runoffs 2022 and Runoffs 202515 ▾2 rule changes between Runoffs 2025 and Runoffs 20262 ▾FX race best at Runoffs 2020: 2:17.553 (Jacob Loomis)FX race best at Runoffs 2021: 1:38.833 (Vaughn Glace)FX race best at Runoffs 2022: 2:08.711 (Dimitrios Tsesmetzis)FX qualifying best at Runoffs 2020: 2:16.968 (Jacob Loomis)FX qualifying best at Runoffs 2021: 1:38.596 (Vaughn Glace)FX qualifying best at Runoffs 2022: 1:51.480 (Trevor A Russell)P race best at Runoffs 2025: 2:02.122 (Bart Wolf)P race best at Runoffs 2026: 2:03.283 (Lawrence Loshak)P qualifying best at Runoffs 2025: 2:01.180 (Lee Alexander)P qualifying best at Runoffs 2026: 2:02.281 (Perry Richardson)Road America · Runoffs 2020Runoffs2020Indianapolis Motor Speedway · Runoffs 2021Runoffs2021Virginia International Raceway · Runoffs 2022Runoffs2022Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
FXPsolid race · dashed qualifying · slower is lower
100%5 rule changes between Runoffs 2020 and Runoffs 20215 ▾9 rule changes between Runoffs 2021 and Runoffs 20229 ▾15 rule changes between Runoffs 2022 and Runoffs 202515 ▾2 rule changes between Runoffs 2025 and Runoffs 20262 ▾FX race best at Runoffs 2020: 100.0% of FX's (Jacob Loomis)FX race best at Runoffs 2021: 100.0% of FX's (Vaughn Glace)FX race best at Runoffs 2022: 100.0% of FX's (Dimitrios Tsesmetzis)FX qualifying best at Runoffs 2020: 100.0% of FX's (Jacob Loomis)FX qualifying best at Runoffs 2021: 100.0% of FX's (Vaughn Glace)FX qualifying best at Runoffs 2022: 100.0% of FX's (Trevor A Russell)Road America · Runoffs 2020Runoffs2020Indianapolis Motor Speedway · Runoffs 2021Runoffs2021Virginia International Raceway · Runoffs 2022Runoffs2022Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
FXPsolid 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
EventFXP
Qual best Race best Trap Qual best Race best Trap vs FX % of FX 
Road America Runoffs 20262026-09-282:02.281Perry Richardson · fastest of 10 · top 5 within 1.3s+1.101s (+0.91%)2:03.283Lawrence Loshak · fastest of 10 · top 5 within 0.8s+1.161s (+0.95%)165.6Jason Miller+0.7 mph (+0.4%)
2 rule changes (FX: 1, P: 1)1 engine · 1 suspension & brakesshowhide
  • FX Update sealed engine teardown section #40622engine
  • P Request to Continue to Allow Carbon Brakes #39476suspension & brakes
Road America Runoffs 20252025-09-292:01.180Lee Alexander · fastest of 14 · top 5 within 1.5s2:02.122Bart Wolf · fastest of 13 · top 5 within 2.1s165.0Jason Miller
15 rule changes (FX: 8, P: 7)6 weight · 2 induction · 2 tyres & wheels · 1 engine · 4 othershowhide
  • P 13B Rotary Engine Rules Change Request #38856induction
  • P Add Radical Cup series Radical SR3 spec line to Table 1 #38916other
  • P Clarify spec line cars language #38943weight
  • P RM 25-05 - Prototype Engine Table A, 2 Cycle Restrictor Change #38929induction
  • P Add missing punctuation marks #38150weight
  • P Correct text in engine table notes #37606engine
  • P Update Prototype class designation #37653tyres & wheels
  • FX Request to Change to Weight for Ligier JS F422 #37124weight -15 lbs
  • FX Adjust minimum weights to align with pro F4 rules #36221weight -15 lbs
  • FX Add Classification for 2nd Gen Ligier JS F422 #35844other
  • FX Clarify Formula 4 Rules in FX #35700tyres & wheels
  • FX FM Rules Update #34841other
  • FX USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC #34329weight
  • FX E&O - Remove references to FB and FM in GCR section 1.4.2.D #33725other
  • FX Reclassify 2010-2017 Formula Renault 2.0 as a spec line car in FA #33395weight
Virginia International Raceway Runoffs 20222022-09-241:51.480Trevor A Russell · fastest of 5 · top 5 within 9.7s2:08.711Dimitrios Tsesmetzis · fastest of 4 · top 4 within 6.8s137.2Trevor A Russell
9 rule changes (FX: 9)4 tyres & wheels · 2 engine · 2 weight · 1 inductionshowhide
  • FX Pro Formula F2000/USF2000 Transmission E&O #32823weight
  • FX Formula Mazda Minimum Weight #33010weight
  • FX Formula Mazda Spec Line E&O Corrections #33011engine
  • FX Formula Renault 2.0 (10-17) Intake Restrictor #32745induction
  • FX Allow Performance Electronics PE3-8400 for USF2000 MZR #32767engine
  • FX FM Rule Set Clarification #31881tyres & wheels
  • FX E&O F4 Tires #31940tyres & wheels
  • FX E&O USF2000 Tube Frame #31951tyres & wheels
  • FX URGENT - FX- Formula Renault Tire #32058tyres & wheels
Indianapolis Motor Speedway Runoffs 20212021-09-251:38.596Vaughn Glace · fastest of 15 · top 5 within 4.1s1:38.833Vaughn Glace · fastest of 15 · top 5 within 4.3s138.6Vaughn Glace
5 rule changes (FX: 5)2 cars added · 2 tyres & wheels · 1 inductionshowhide
  • FX Rules Adjustment #30950tyres & wheels
  • FX FX/FRP Tire Rule #30723tyres & wheels
  • FX Classify the 2000-2009 Formula Renault 2.0 / Fran-Am 2000 #30460cars added
  • FX Request for Car Classification to Compete in Formula X #29933cars added
  • FX Update specifications for FormulaSPEED cars #29674induction
Road America Runoffs 20202020-10-022:16.968Jacob Loomis · fastest of 12 · top 5 within 2.7s2:17.553Jacob Loomis · fastest of 11 · top 5 within 3.5s139.3Brad Drew
6 earlier rule changes on record, in force before Runoffs 2020 (from 2020)3 cars added · 1 induction · 1 tyres & wheels · 1 othershowhide
  • FX Follow up to to Letter#28991 Request for FX classification #29281cars added
  • FX Request to be added to FX group #28991other
  • FX Request to classify FSV in FX #28057cars added
  • FX Classify FormulaSPEED in FX #28715cars added
  • FX Request to remove tire marking language from FM #28415tyres & wheels
  • FX Change to FX Table 1 #28322induction

By track

TrackEvents Typical % of FX Best Latest 
Road America3100.0%1 of 3 with FX100.0%Runoffs 2020100.0%Runoffs 2020
Indianapolis Motor Speedway1100.0%100.0%Runoffs 2021100.0%Runoffs 2021
Virginia International Raceway1100.0%100.0%Runoffs 2022100.0%Runoffs 2022
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.