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BoP Lab / Classes / FX

FX vs FF vs SM 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.

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AS+B-Spec+EP+FA+FC+FE2+vsFF×FP+FV+FX×GT1+GT2+GTX+HP+P+P2+vsSM×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 · FF 104.3% of FX Simon Sikes, Road America Runoffs 2020 qualifying · SM 108.1% of FX Travis Wiley, Virginia International Raceway Runoffs 2022 race

1:402:002:202:407 rule changes between Runoffs 2018 and Runoffs 20197 ▾12 rule changes between Runoffs 2019 and Runoffs 202012 ▾9 rule changes between Runoffs 2020 and Runoffs 20219 ▾10 rule changes between Runoffs 2021 and Runoffs 202210 ▾5 rule changes between Runoffs 2022 and Runoffs 20235 ▾10 rule changes between Runoffs 2023 and Runoffs 202410 ▾9 rule changes between Runoffs 2024 and Runoffs 20259 ▾5 rule changes between Runoffs 2025 and Runoffs 20265 ▾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)FF race best at Runoffs 2015: 2:03.383 (Rick Payne)Off the chart: FF race best at Runoffs 2016: 1:30.133 (Neil Verhagen)FF race best at Runoffs 2017: 1:44.524 (Jonathon Kotyk)FF race best at Runoffs 2018: 1:42.049 (Jonathon Kotyk)FF race best at Runoffs 2019: 2:20.474 (Jonathan Kotyk)FF race best at Runoffs 2020: 2:24.268 (Jeffrey Bartz)FF race best at Runoffs 2021: 1:55.676 (Jonathan Kotyk)FF race best at Runoffs 2022: 2:18.358 (Jonathan Kotyk)FF race best at Runoffs 2023: 2:00.583 (Jonathan Kotyk)FF race best at Runoffs 2024: 2:22.057 (Sebastian Mateo Naranjo)FF race best at Runoffs 2025: 2:25.541 (Calvin Kautz)FF race best at Runoffs 2026: 2:23.686 (Nathan Down)FF qualifying best at Runoffs 2015: 2:02.489 (Tim Kautz)Off the chart: FF qualifying best at Runoffs 2016: 1:29.213 (Neil Verhagen)FF qualifying best at Runoffs 2017: 1:44.601 (Zach Holden)FF qualifying best at Runoffs 2018: 1:41.612 (Jonathon Kotyk)FF qualifying best at Runoffs 2019: 1:59.563 (Tyler O'Connor)FF qualifying best at Runoffs 2020: 2:22.916 (Simon Sikes)FF qualifying best at Runoffs 2021: 1:44.359 (Jonathan Kotyk)FF qualifying best at Runoffs 2022: 1:59.215 (Jonathan Kotyk)FF qualifying best at Runoffs 2023: 1:59.249 (Nolan Allaer)FF qualifying best at Runoffs 2024: 2:22.552 (Calvin Kautz)FF qualifying best at Runoffs 2025: 2:24.905 (Jonathan Kotyk)FF qualifying best at Runoffs 2026: 2:23.047 (David Ybarra)SM race best at Runoffs 2015: 2:24.067 (Todd Lamb)SM race best at Runoffs 2016: 1:40.764 (Michael Carter)SM race best at Runoffs 2017: 1:59.100 (Michael Gagliardo)SM race best at Runoffs 2018: 1:55.278 (Michael Carter)SM race best at Runoffs 2019: 2:16.459 (Elivan Goulart)SM race best at Runoffs 2020: 2:43.748 (Preston Pardus)SM race best at Runoffs 2021: 1:58.837 (Brian Henderson)SM race best at Runoffs 2022: 2:19.107 (Travis Wiley)SM race best at Runoffs 2023: 2:16.229 (Julian DaCosta)SM race best at Runoffs 2024: 2:41.486 (Brett Kowalski)SM race best at Runoffs 2025: 2:44.430 (Kyle Greenhill)SM race best at Runoffs 2026: 2:42.725 (Francisco Barroso)SM qualifying best at Runoffs 2015: 2:18.661 (Andrew Carbonell)SM qualifying best at Runoffs 2016: 1:40.514 (Justin Hille)SM qualifying best at Runoffs 2017: 1:58.306 (Chris Haldeman)SM qualifying best at Runoffs 2018: 1:54.355 (Ken Sutherland)SM qualifying best at Runoffs 2019: 2:14.552 (Todd Buras)SM qualifying best at Runoffs 2020: 2:42.209 (Kyle Greenhill)SM qualifying best at Runoffs 2021: 1:57.695 (Brian Henderson)SM qualifying best at Runoffs 2022: 2:14.664 (Danny Steyn)SM qualifying best at Runoffs 2023: 2:14.986 (Danny Steyn)SM qualifying best at Runoffs 2024: 2:41.106 (Ethan Goulart)SM qualifying best at Runoffs 2025: 2:43.111 (Bobby Gossett)SM qualifying best at Runoffs 2026: 2:42.173 (Brett Kowalski)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
FXFFSMsolid race · dashed qualifying · slower is lower
100%105%110%115%120%7 rule changes between Runoffs 2018 and Runoffs 20197 ▾12 rule changes between Runoffs 2019 and Runoffs 202012 ▾9 rule changes between Runoffs 2020 and Runoffs 20219 ▾10 rule changes between Runoffs 2021 and Runoffs 202210 ▾5 rule changes between Runoffs 2022 and Runoffs 20235 ▾10 rule changes between Runoffs 2023 and Runoffs 202410 ▾9 rule changes between Runoffs 2024 and Runoffs 20259 ▾5 rule changes between Runoffs 2025 and Runoffs 20265 ▾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)FF race best at Runoffs 2020: 104.9% of FX's (Jeffrey Bartz)FF race best at Runoffs 2021: 117.0% of FX's (Jonathan Kotyk)FF race best at Runoffs 2022: 107.5% of FX's (Jonathan Kotyk)FF qualifying best at Runoffs 2020: 104.3% of FX's (Simon Sikes)FF qualifying best at Runoffs 2021: 105.8% of FX's (Jonathan Kotyk)FF qualifying best at Runoffs 2022: 106.9% of FX's (Jonathan Kotyk)SM race best at Runoffs 2020: 119.0% of FX's (Preston Pardus)SM race best at Runoffs 2021: 120.2% of FX's (Brian Henderson)SM race best at Runoffs 2022: 108.1% of FX's (Travis Wiley)SM qualifying best at Runoffs 2020: 118.4% of FX's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 119.4% of FX's (Brian Henderson)SM qualifying best at Runoffs 2022: 120.8% of FX's (Danny Steyn)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
FXFFSMsolid 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
EventFXFFSM
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 20262026-09-282:23.047David Ybarra · fastest of 20 · top 5 within 1.4s-1.858s (-1.28%)2:23.686Nathan Down · fastest of 20 · top 5 within 1.6s-1.855s (-1.27%)138.9Tazio Stefanelli+0.5 mph (+0.3%)2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%)2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%)119.6Wyatt Couch+0.3 mph (+0.3%)
5 rule changes (FX: 1, FF: 2, SM: 2)2 engine · 1 tyres & wheels · 1 wording · 1 othershowhide
  • FX Update sealed engine teardown section #40622engine
  • FF Clarification in FF Kent 1600 Compression Ratio Paragraph #40293engine
  • SM Rear Toe Link #40271other
  • SM Part Number Change Request #39914wording
  • FF Formula F Alternative Tire Rule Proposed Clarifications #39281tyres & wheels
Road America Runoffs 20252025-09-292:24.905Jonathan Kotyk · fastest of 17 · top 5 within 1.1s+2.353s (+1.65%)2:25.541Calvin Kautz · fastest of 16 · top 5 within 0.5s+3.484s (+2.45%)138.4Tazio Stefanelli-2.3 mph (-1.6%)2:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%)2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%)119.3Francisco Barroso-0.6 mph (-0.5%)
9 rule changes (FX: 1, FF: 4, SM: 4)3 tyres & wheels · 3 weight · 1 wording · 2 othershowhide
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • FF Page 228, FF tire rule 9.1.1.10.e #38251tyres & wheels
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • FF Formula F Proposal to Invite Older Cars Via a Tire Rule Change #37802tyres & wheels
  • FX Request to Change to Weight for Ligier JS F422 #37124weight -15 lbs
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • FF Change FF/FC Weight with Sequential Gearbox #36651weight
  • FF Alternative Oversize Honda Fit Pistons #37064weight
Road America Runoffs 20242024-10-012:22.552Calvin Kautz · fastest of 13 · top 5 within 1.1s-0.364s (-0.25%)2:22.057Sebastian Mateo Naranjo · fastest of 13 · top 5 within 0.6s-2.211s (-1.53%)140.7Calvin Kautz+2.6 mph (+1.9%)2:41.106Ethan Goulart · fastest of 49 · top 5 within 0.5s-1.103s (-0.68%)2:41.486Brett Kowalski · fastest of 43 · top 5 within 0.3s-2.262s (-1.38%)119.9Alex Bertagnoli-1.4 mph (-1.2%)
10 rule changes (FX: 4, FF: 2, SM: 4)2 engine · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 1 wording · 4 othershowhide
  • FF Update to FF EGR Blanking Plate Rule #36633engine
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • 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
  • FF Honda Fit Oversize Piston Rings #35305other
  • FX FM Rules Update #34841other
Virginia International Raceway Runoffs 20232023-09-231:59.249Nolan Allaer · fastest of 8 · top 5 within 2.8s+0.034s (+0.03%)2:00.583Jonathan Kotyk · fastest of 8 · top 5 within 0.4s-17.775s (-12.85%)138.4Calvin Kautz+0.1 mph (+0.1%)2:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%)2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%)120.3Jim Drago+1.1 mph (+0.9%)
5 rule changes (FX: 3, FF: 1, SM: 1)3 weight · 1 engine · 1 othershowhide
  • FX USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC #34329weight
  • FF Add Fast Forward Part Numbers for Honda Fit Engine #33752engine
  • FX E&O - Remove references to FB and FM in GCR section 1.4.2.D #33725other
  • SM BOP for NB1 and NB2 #32309weight
  • 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 Russell1:59.215Jonathan Kotyk · fastest of 13 · top 5 within 1.2s-0.348s (-0.29%)2:18.358Jonathan Kotyk · fastest of 12 · top 5 within 2.4s-2.116s (-1.51%)138.3Tim Kautz+2.2 mph (+1.6%)+9.647squal +7.735s107.5%qual 106.9%2:14.664Danny Steyn · fastest of 60 · top 5 within 0.2s+0.112s (+0.08%)2:19.107Travis Wiley · fastest of 58 · top 5 within 0.9s+2.648s (+1.94%)119.2Jonathan Neudorf-0.6 mph (-0.5%)+10.396squal +23.184s108.1%qual 120.8%
10 rule changes (FX: 9, SM: 1)4 tyres & wheels · 2 engine · 2 weight · 1 induction · 1 suspension & brakesshowhide
  • 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
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • 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 Glace1:44.359Jonathan Kotyk · fastest of 24 · top 5 within 1.1s-0.242s (-0.23%)1:55.676Jonathan Kotyk · fastest of 23 · top 5 within 1.8s+11.152s (+10.67%)141.6Nicholas Sheppard+16.843squal +5.763s117.0%qual 105.8%1:57.695Brian Henderson · fastest of 90 · top 5 within 0.5s-0.611s (-0.52%)1:58.837Brian Henderson · fastest of 88 · top 5 within 0.3s-0.263s (-0.22%)119.8Kyle Greenhill+20.004squal +19.099s120.2%qual 119.4%
9 rule changes (FX: 5, FF: 3, SM: 1)2 cars added · 2 engine · 2 tyres & wheels · 1 induction · 1 wording · 1 othershowhide
  • 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
  • FF Kent crankshaft clarification #30426wording
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • FX Request for Car Classification to Compete in Formula X #29933cars added
  • FF Allow Optional Coolant Bleed Line to Correct a Known Problem #29673engine
  • FF Clarification regarding Honda LC1 ECU implementation date #29684engine
  • 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 Drew2:22.916Simon Sikes · fastest of 14 · top 5 within 1.6s2:24.268Jeffrey Bartz · fastest of 14 · top 5 within 0.4s138.1Jeffrey Bartz+6.715squal +5.948s104.9%qual 104.3%2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill+26.195squal +25.241s119.0%qual 118.4%
12 rule changes (FX: 6, FF: 4, SM: 2)4 engine · 3 cars added · 2 tyres & wheels · 1 induction · 1 suspension & brakes · 1 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • FX Follow up to to Letter#28991 Request for FX classification #29281cars added
  • FF Clarification regarding Honda LC1 ECU implementation #29135engine
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • FX Request to be added to FX group #28991other
  • FF E&O FF Kent Engine alternator language #28204engine
  • FX Request to classify FSV in FX #28057cars added
  • FX Classify FormulaSPEED in FX #28715cars added
  • FF Honda Racing HPD low cost ECU proposal #27563engine
  • FF Update rain tire designation #28443tyres & wheels
  • FX Request to remove tire marking language from FM #28415tyres & wheels
  • FX Change to FX Table 1 #28322induction
Virginia International Raceway Runoffs 20192019-10-051:59.563Tyler O'Connor · fastest of 14 · top 5 within 1.4s2:20.474Jonathan Kotyk · fastest of 14 · top 5 within 6.3s136.2Derek Ketchie2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago
7 rule changes (FF: 3, SM: 4)3 engine · 1 induction · 1 tyres & wheels · 1 weight · 1 wordingshowhide
  • SM Request to allow aftermarket fuel filters. #26370wording
  • FF Request for Oversize Honda Fit Pistons #25810engine
  • FF Heat Shield - Fit Intake #26102induction
  • FF Request catch cans/tanks clarification #26158engine
  • SM Request 99-00 replacement Wire harnesses #25602engine
  • SM Organize and Clarify 9.1.7.C.1.o. #25913weight
  • SM Strike Tire Tread Language #26123tyres & wheels
Sonoma Raceway Runoffs 20182018-10-101:41.612Jonathon Kotyk · fastest of 22 · top 5 within 1.7s1:42.049Jonathon Kotyk · fastest of 22 · top 5 within 1.3s115.7Denny Renfrow1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:44.601Zach Holden · fastest of 36 · top 5 within 1.2s1:44.524Jonathon Kotyk · fastest of 36 · top 5 within 0.5s1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:29.213Neil Verhagen · fastest of 14 · top 5 within 2.1s1:30.133Neil Verhagen · fastest of 14 · top 5 within 1.4s1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:02.489Tim Kautz · fastest of 25 · top 5 within 1.1s2:03.383Rick Payne · fastest of 22 · top 5 within 0.8s2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s

By track

TrackEvents Typical % of FX Best Latest 
Road America4100.0%1 of 4 with FX100.0%Runoffs 2020100.0%Runoffs 2020
Virginia International Raceway3100.0%1 of 3 with FX100.0%Runoffs 2022100.0%Runoffs 2022
Indianapolis Motor Speedway2100.0%1 of 2 with FX100.0%Runoffs 2021100.0%Runoffs 2021
Daytona International Speedway10 of 1 with FX
Mid-Ohio Sports Car Course10 of 1 with FX
Sonoma Raceway10 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.