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FC vs FX pace at every track

Lap times across years say as much about the weather as the class. % of FC is each class's best lap as a share of FC'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+vsFX×GT1+GT2+GTX+HP+P+P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+Show 51 inactive classes
Series
Reference class · the yardstick the % column and chart are measured against
Tracks · untick to narrow

Quickest here: FC 1:21.962 John LaRue, Runoffs 2016 qualifying · FX 1:38.596 Vaughn Glace, Runoffs 2021 qualifying

1:201:402:002:202 rule changes between Runoffs 2018 and Runoffs 20192 ▾10 rule changes between Runoffs 2019 and Runoffs 202010 ▾6 rule changes between Runoffs 2020 and Runoffs 20216 ▾14 rule changes between Runoffs 2021 and Runoffs 202214 ▾6 rule changes between Runoffs 2022 and Runoffs 20236 ▾6 rule changes between Runoffs 2023 and Runoffs 20246 ▾3 rule changes between Runoffs 2024 and Runoffs 20253 ▾3 rule changes between Runoffs 2025 and Runoffs 20263 ▾FC race best at Runoffs 2015: 1:55.135 (Yufeng Luo)FC race best at Runoffs 2016: 1:22.049 (Nigel Saurino)FC race best at Runoffs 2017: 1:36.890 (Tim Minor)FC race best at Runoffs 2018: 1:34.053 (Mitch Egner)FC race best at Runoffs 2019: 1:52.174 (Robert Allaer)FC race best at Runoffs 2020: 2:13.608 (Robert Allaer)FC race best at Runoffs 2021: 1:36.980 (Simon Sikes)FC race best at Runoffs 2022: 2:07.859 (Nolan Allaer)FC race best at Runoffs 2023: 1:51.169 (Nolan Allaer)FC race best at Runoffs 2024: 2:11.534 (Michael Varacins)FC race best at Runoffs 2025: 2:12.824 (Brandon Dixon)FC race best at Runoffs 2026: 2:11.389 (Brandon Dixon)FC qualifying best at Runoffs 2015: 1:54.477 (Yufeng Luo)FC qualifying best at Runoffs 2016: 1:21.962 (John LaRue)FC qualifying best at Runoffs 2017: 1:36.336 (Austin McCusker)FC qualifying best at Runoffs 2018: 1:32.571 (Timothy de Silva)FC qualifying best at Runoffs 2019: 1:51.200 (Robert Allaer)FC qualifying best at Runoffs 2020: 2:12.644 (Robert Allaer)FC qualifying best at Runoffs 2021: 1:36.787 (Trent Walko)FC qualifying best at Runoffs 2022: 1:49.895 (Nolan Allaer)FC qualifying best at Runoffs 2023: 1:50.281 (Nolan Allaer)FC qualifying best at Runoffs 2024: 2:11.626 (Timothy Minor)FC qualifying best at Runoffs 2025: 2:11.259 (Brandon Dixon)FC qualifying best at Runoffs 2026: 2:10.686 (Brandon Dixon)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)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
FCFXsolid race · dashed qualifying · slower is lower
100%100.5%101%101.5%102%102.5%103%2 rule changes between Runoffs 2018 and Runoffs 20192 ▾10 rule changes between Runoffs 2019 and Runoffs 202010 ▾6 rule changes between Runoffs 2020 and Runoffs 20216 ▾14 rule changes between Runoffs 2021 and Runoffs 202214 ▾6 rule changes between Runoffs 2022 and Runoffs 20236 ▾6 rule changes between Runoffs 2023 and Runoffs 20246 ▾3 rule changes between Runoffs 2024 and Runoffs 20253 ▾3 rule changes between Runoffs 2025 and Runoffs 20263 ▾FC race best at Runoffs 2015: 100.0% of FC's (Yufeng Luo)FC race best at Runoffs 2016: 100.0% of FC's (Nigel Saurino)FC race best at Runoffs 2017: 100.0% of FC's (Tim Minor)FC race best at Runoffs 2018: 100.0% of FC's (Mitch Egner)FC race best at Runoffs 2019: 100.0% of FC's (Robert Allaer)FC race best at Runoffs 2020: 100.0% of FC's (Robert Allaer)FC race best at Runoffs 2021: 100.0% of FC's (Simon Sikes)FC race best at Runoffs 2022: 100.0% of FC's (Nolan Allaer)FC race best at Runoffs 2023: 100.0% of FC's (Nolan Allaer)FC race best at Runoffs 2024: 100.0% of FC's (Michael Varacins)FC race best at Runoffs 2025: 100.0% of FC's (Brandon Dixon)FC race best at Runoffs 2026: 100.0% of FC's (Brandon Dixon)FC qualifying best at Runoffs 2015: 100.0% of FC's (Yufeng Luo)FC qualifying best at Runoffs 2016: 100.0% of FC's (John LaRue)FC qualifying best at Runoffs 2017: 100.0% of FC's (Austin McCusker)FC qualifying best at Runoffs 2018: 100.0% of FC's (Timothy de Silva)FC qualifying best at Runoffs 2019: 100.0% of FC's (Robert Allaer)FC qualifying best at Runoffs 2020: 100.0% of FC's (Robert Allaer)FC qualifying best at Runoffs 2021: 100.0% of FC's (Trent Walko)FC qualifying best at Runoffs 2022: 100.0% of FC's (Nolan Allaer)FC qualifying best at Runoffs 2023: 100.0% of FC's (Nolan Allaer)FC qualifying best at Runoffs 2024: 100.0% of FC's (Timothy Minor)FC qualifying best at Runoffs 2025: 100.0% of FC's (Brandon Dixon)FC qualifying best at Runoffs 2026: 100.0% of FC's (Brandon Dixon)FX race best at Runoffs 2020: 103.0% of FC's (Jacob Loomis)FX race best at Runoffs 2021: 101.9% of FC's (Vaughn Glace)FX race best at Runoffs 2022: 100.7% of FC's (Dimitrios Tsesmetzis)FX qualifying best at Runoffs 2020: 103.3% of FC's (Jacob Loomis)FX qualifying best at Runoffs 2021: 101.9% of FC's (Vaughn Glace)FX qualifying best at Runoffs 2022: 101.4% of FC's (Trevor A Russell)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
FCFXsolid race · dashed qualifying · each class's best lap as a share of FC's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventFCFX
Qual bestRace bestTrapQual bestRace bestTrapvs FC% of FC
Road America Runoffs 20262026-09-282:10.686Brandon Dixon · fastest of 10 · top 5 within 4.0s-0.573s (-0.44%)2:11.389Brandon Dixon · fastest of 10 · top 5 within 2.7s-1.435s (-1.08%)143.3Dean Kiriluk-1.8 mph (-1.2%)
3 rule changes (FC: 2, FX: 1)1 weight · 1 wording · 1 other · FX sealed engines now subject to section 9.3.42 requirements instead of full inspection and reassembly costs. · FC USF2000 Tube Frame may now use Hewland LD200 4-speed H-pattern as alternative to Hewland JL-200 5-speed sequential. · FC F2000 Metrik ZF2 minimum weight reduced to 1220 lbs.showhide
  • FX Update sealed engine teardown section #40622wordingwordingFX sealed engines now subject to section 9.3.42 requirements instead of full inspection and reassembly costs.
  • FC F2000 MZR Spec Line Clarity/Revision Requested #38927otheraddedFC USF2000 Tube Frame may now use Hewland LD200 4-speed H-pattern as alternative to Hewland JL-200 5-speed sequential.
  • FC Adjust F2000 Metrik ZF2 weight #39612weight -20 lbsfaster · weightFC F2000 Metrik ZF2 minimum weight reduced to 1220 lbs.
Road America Runoffs 20252025-09-292:11.259Brandon Dixon · fastest of 10 · top 5 within 2.7s-0.367s (-0.28%)2:12.824Brandon Dixon · fastest of 9 · top 5 within 2.3s+1.290s (+0.98%)145.1Brandon Dixon+0.9 mph (+0.6%)
3 rule changes (FC: 2, FX: 1)2 weight · 1 wording · FX Ligier JS F422 minimum weight reduces to 1360 lbs from 1375 lbs. · FC tire rule clarified: four dry and four wet tires for Regionals and Majors, eight each for Runoffs; marking and declaration timing adjusted. · FF and FC sequential gearbox weight penalty reduces from 25 lbs to 10 lbs minimum weight addition.showhide
  • FX Request to Change to Weight for Ligier JS F422 #37124weight -15 lbsfaster · weightFX Ligier JS F422 minimum weight reduces to 1360 lbs from 1375 lbs.
  • FC 9.1.1.10.h. FC Tire Rule #36533wordingwordingFC tire rule clarified: four dry and four wet tires for Regionals and Majors, eight each for Runoffs; marking and declaration timing adjusted.
  • FC Change FF/FC Weight with Sequential Gearbox #36651weightfaster · weightFF and FC sequential gearbox weight penalty reduces from 25 lbs to 10 lbs minimum weight addition.
Road America Runoffs 20242024-10-012:11.626Timothy Minor · fastest of 10 · top 5 within 1.3s-1.018s (-0.77%)2:11.534Michael Varacins · fastest of 9 · top 5 within 1.8s-2.074s (-1.55%)144.2Michael Varacins+1.8 mph (+1.2%)
6 rule changes (FC: 2, FX: 4)2 cars added · 2 weight · 1 wording · 1 other · FX Ligier JS F4 1st Gen minimum weight drops 15 lbs to 1405; 2nd Gen rises 31 lbs to 1375. · FC F2000 Metrik ZF2 added as spec line car with Brembo 4-piston calipers and vented rotors permitted. · FX adds Ligier JS F422 second generation classification, new car permitted. · FX Formula 4 removed reference to FIA Technical Regulations 2015 and subsequent safety requirements; tire choice remains unrestricted. · FX Formula Mazda specifications updated; attached table not provided.showhide
  • FX Adjust minimum weights to align with pro F4 rules #36221weight -15 lbsfaster · weightFX Ligier JS F4 1st Gen minimum weight drops 15 lbs to 1405; 2nd Gen rises 31 lbs to 1375.
  • FC Four Pot Calipers #35481cars addedaddedFC F2000 Metrik ZF2 added as spec line car with Brembo 4-piston calipers and vented rotors permitted.
  • FX Add Classification for 2nd Gen Ligier JS F422 #35844cars addedaddedFX adds Ligier JS F422 second generation classification, new car permitted.
  • FX Clarify Formula 4 Rules in FX #35700wordingunclearFX Formula 4 removed reference to FIA Technical Regulations 2015 and subsequent safety requirements; tire choice remains unrestricted.
  • FC Please correct omitted punctuation #34890weight
  • FX FM Rules Update #34841otherunclearFX Formula Mazda specifications updated; attached table not provided.
Virginia International Raceway Runoffs 20232023-09-231:50.281Nolan Allaer · fastest of 11 · top 5 within 2.3s+0.386s (+0.35%)1:51.169Nolan Allaer · fastest of 11 · top 5 within 2.5s-16.690s (-13.05%)143.5Robert Allaer+2.3 mph (+1.7%)
6 rule changes (FC: 3, FX: 3)2 cars added · 1 weight · 3 wording · FC tire marking rule clarified: four dry and four wet tires for Regional/Major/Super Tour, eight each for Runoffs; undeclared tire penalty removed. · USF2000 Van Diemen with Mazda MZR LF-DE 2.0L added to FC as spec line car; removed from FX. · USF2000 Van Diemen with Mazda MZR LF-DE 2.0L added to FC as spec line car; removed from FX. · FX: Remove FB and FM from combined-class preferences in GCR 1.4.2.D. · FC/FF PE3-8400 ECU tune-file firmware version changes from V3.04.50 to V3.04.35. · Formula Renault 2.0 (10-17) reclassified from FX to FA spec line; minimum weight reduced 1300 to 1280 lbs, restrictor removed.showhide
  • FC Review FC Runoffs Tire Marking Rule #34274wordingwordingFC tire marking rule clarified: four dry and four wet tires for Regional/Major/Super Tour, eight each for Runoffs; undeclared tire penalty removed.
  • FC USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC #34329cars addedaddedUSF2000 Van Diemen with Mazda MZR LF-DE 2.0L added to FC as spec line car; removed from FX.
  • FX USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC #34329cars addedaddedUSF2000 Van Diemen with Mazda MZR LF-DE 2.0L added to FC as spec line car; removed from FX.
  • FX E&O - Remove references to FB and FM in GCR section 1.4.2.D #33725wordingwordingFX: Remove FB and FM from combined-class preferences in GCR 1.4.2.D.
  • FC E&O 9.1.1.B.16.j #33634wordingwordingFC/FF PE3-8400 ECU tune-file firmware version changes from V3.04.50 to V3.04.35.
  • FX Reclassify 2010-2017 Formula Renault 2.0 as a spec line car in FA #33395weightfaster · weightFormula Renault 2.0 (10-17) reclassified from FX to FA spec line; minimum weight reduced 1300 to 1280 lbs, restrictor removed.
Virginia International Raceway Runoffs 20222022-09-241:49.895Nolan Allaer · fastest of 12 · top 5 within 1.5s-1.305s (-1.17%)2:07.859Nolan Allaer · fastest of 13 · top 5 within 3.8s+15.685s (+13.98%)141.2Tim Minor-0.6 mph (-0.4%)1:51.480Trevor A Russell · fastest of 5 · top 5 within 9.7s2:08.711Dimitrios Tsesmetzis · fastest of 4 · top 4 within 6.8s137.2Trevor A Russell+0.852squal +1.585s100.7%qual 101.4%
14 rule changes (FC: 5, FX: 9)3 tyres & wheels · 2 cars added · 1 engine · 1 induction · 1 weight · 6 wording · Pro Formula F2000 tube frame transmission cut to 4 forward gears; sequential carries 25 lb. weight penalty. · FX Formula Mazda minimum weight set to 1270 lb. · FX Formula Mazda drops four-port Renesis engine option; weight minimum now per notes. · FC Zetec ECU: Performance Electronics model designation changed from PE-3 to PE3-8400; monitor firmware updated to V3.04.50. · Formula Renault 2.0 (10-17) now requires 45mm Flat Plate Intake Restrictor; fairings before or after prohibited. · USF2000 Tube Frame adds Performance Electronics PE3-8400 ECU as alternative to Pectel T2. · Formula Mazda FX rule reference updated to current specifications document; tire marking no longer required. · FX Formula 4 tire choice unrestricted; must provide FIA certification rules upon request. · FX USF2000 Tube Frame front tyre changes from Hoosier radial 20.5 x 7.0 x 13 to any Hoosier 20.5 x 7.0 x 13. · FX Formula Renault 2.0 (00-09) and (10-17) tire choice unrestricted; no other component alterations except repairs. · FC chassis/frame section cleaned up: panels between main tubes must prevent cockpit intrusion; suspension cannot mount to exterior panels; engine/gearbox exempt from load-bearing restrictions. · FC Zetec ECU requirements clarified: Pectel T2 or PE-3 required with specified communications ports and SCCA tune-file/map from official website. · FC composite anti-intrusion panels of non-uniform thickness limited to eight fasteners per side. · FC tire marking requirements clarified: competitor must ensure tires declared, marked, and logged by Tech before qualifying or race use.showhide
  • FX Pro Formula F2000/USF2000 Transmission E&O #32823engineslower · enginePro Formula F2000 tube frame transmission cut to 4 forward gears; sequential carries 25 lb. weight penalty.
  • FX Formula Mazda Minimum Weight #33010weightslower · weightFX Formula Mazda minimum weight set to 1270 lb.
  • FX Formula Mazda Spec Line E&O Corrections #33011cars addedremoved · cars addedFX Formula Mazda drops four-port Renesis engine option; weight minimum now per notes.
  • FC Add Specification to Performance Electronics ECU for Ford Zetec #32761wordingwordingFC Zetec ECU: Performance Electronics model designation changed from PE-3 to PE3-8400; monitor firmware updated to V3.04.50.
  • FX Formula Renault 2.0 (10-17) Intake Restrictor #32745inductionslower · inductionFormula Renault 2.0 (10-17) now requires 45mm Flat Plate Intake Restrictor; fairings before or after prohibited.
  • FX Allow Performance Electronics PE3-8400 for USF2000 MZR #32767cars addedaddedUSF2000 Tube Frame adds Performance Electronics PE3-8400 ECU as alternative to Pectel T2.
  • FX FM Rule Set Clarification #31881wordingwordingFormula Mazda FX rule reference updated to current specifications document; tire marking no longer required.
  • FX E&O F4 Tires #31940tyres & wheelsadded · tyres & wheelsFX Formula 4 tire choice unrestricted; must provide FIA certification rules upon request.
  • FX E&O USF2000 Tube Frame #31951tyres & wheelstyres & wheelsFX USF2000 Tube Frame front tyre changes from Hoosier radial 20.5 x 7.0 x 13 to any Hoosier 20.5 x 7.0 x 13.
  • FX URGENT - FX- Formula Renault Tire #32058tyres & wheelsadded · tyres & wheelsFX Formula Renault 2.0 (00-09) and (10-17) tire choice unrestricted; no other component alterations except repairs.
  • FC Clean up Chassis/Frame section #31867wordingwordingFC chassis/frame section cleaned up: panels between main tubes must prevent cockpit intrusion; suspension cannot mount to exterior panels; engine/gearbox exempt from load-bearing restrictions.
  • FC Clarify Zetec ECU requirements #31554wordingwordingFC Zetec ECU requirements clarified: Pectel T2 or PE-3 required with specified communications ports and SCCA tune-file/map from official website.
  • FC Clarify composite anti-intrusion panel language #31426wordingwordingFC composite anti-intrusion panels of non-uniform thickness limited to eight fasteners per side.
  • FC Clarify tire marking requirements #31455wordingwordingFC tire marking requirements clarified: competitor must ensure tires declared, marked, and logged by Tech before qualifying or race use.
Indianapolis Motor Speedway Runoffs 20212021-09-251:36.787Trent Walko · fastest of 31 · top 5 within 1.7s+0.451s (+0.47%)1:36.980Simon Sikes · fastest of 31 · top 5 within 2.0s+0.090s (+0.09%)141.6Tim Minor1:38.596Vaughn Glace · fastest of 15 · top 5 within 4.1s1:38.833Vaughn Glace · fastest of 15 · top 5 within 4.3s138.6Vaughn Glace+1.853squal +1.809s101.9%qual 101.9%
6 rule changes (FC: 1, FX: 5)2 cars added · 1 tyres & wheels · 1 weight · 1 wording · 1 other · FX USF2000 Tube Frame gains Hoosier radial tyre option, FC-compliant shocks, Wilwood brakes, and Bosch spark plugs. · FX USF2000 Tube Frame now allows any Hoosier radial tire 20.5×7.0×13 front, 22.5×8.0×13 rear. · Formula Renault 2.0 / Fran-Am 2000 added to FX class at 1250 lbs with 8-inch front, 10-inch rear wheels, sealed engine. · FC Pinto engine loses 10 lbs to 1190; Pinto aluminum head loses 10 lbs to 1190; Zetec loses 10 lbs to 1210. · FX adds 2010–2017 Formula Renault 2.0, must comply with Table 1 notes. · FX FormulaSPEED FS2.0 now references online specifications instead of requiring World Speed Inc. documentation by April 2020.showhide
  • FX Rules Adjustment #30950otheraddedFX USF2000 Tube Frame gains Hoosier radial tyre option, FC-compliant shocks, Wilwood brakes, and Bosch spark plugs.
  • FX FX/FRP Tire Rule #30723tyres & wheelsadded · tyres & wheelsFX USF2000 Tube Frame now allows any Hoosier radial tire 20.5×7.0×13 front, 22.5×8.0×13 rear.
  • FX Classify the 2000-2009 Formula Renault 2.0 / Fran-Am 2000 #30460cars addedaddedFormula Renault 2.0 / Fran-Am 2000 added to FX class at 1250 lbs with 8-inch front, 10-inch rear wheels, sealed engine.
  • FC Request for FC Weight Change #30171weightfaster · weightFC Pinto engine loses 10 lbs to 1190; Pinto aluminum head loses 10 lbs to 1190; Zetec loses 10 lbs to 1210.
  • FX Request for Car Classification to Compete in Formula X #29933cars addedaddedFX adds 2010–2017 Formula Renault 2.0, must comply with Table 1 notes.
  • FX Update specifications for FormulaSPEED cars #29674wordingwordingFX FormulaSPEED FS2.0 now references online specifications instead of requiring World Speed Inc. documentation by April 2020.
Road America Runoffs 20202020-10-022:12.644Robert Allaer · fastest of 13 · top 5 within 2.1s2:13.608Robert Allaer · fastest of 11 · top 5 within 1.2s142.4Robert Allaer2:16.968Jacob Loomis · fastest of 12 · top 5 within 2.7s2:17.553Jacob Loomis · fastest of 11 · top 5 within 3.5s139.3Brad Drew+3.945squal +4.324s103.0%qual 103.3%
10 rule changes (FC: 4, FX: 6)4 cars added · 2 engine · 1 weight · 3 wording · FC ECU maps clarified: SCCA Club or 2013 Pro map required, available on SCCA website; 1.340 restrictor reminder. · Formula Ireland / Formula FX added to FX class, must comply with Table 1 notes. · FC Zetec engine minimum weight increases 20 lbs to 1220 lbs. · Formula Ireland/Formula FX cars pending specification submission for possible FX table addition. · Ex-Pro Formula Super Vee added to FX with 1600cc VW engine, 1190 lb minimum weight, 6-inch front and 8-inch rear wheels. · FormulaSPEED with 2.0L Mazda MZR engine, 8in front/10in rear wheels, adjustable dual rear planes, 1350 lbs moves from FA to FX. · FX Formula Mazda no longer requires tire marking; must comply with December 2019 GCR rules. · Pro Formula F 2000 and USF2000 Tube Frame engine and car rules simplified; FC rules and FRP MAZDA MZR F2000 specs now apply directly. · FC allows Eagle #CRS5483F3D connecting rods alongside original Ford; crankshaft replacement clarified to original Ford only. · FC allows Mahle #930169439 piston as new option alongside Ford original, Sealed Power #H872cp, United Engine and Machine #SO2763.showhide
  • FC Urgent: SCCA PE3 map unsuitable #29475wordingwordingFC ECU maps clarified: SCCA Club or 2013 Pro map required, available on SCCA website; 1.340 restrictor reminder.
  • FX Follow up to to Letter#28991 Request for FX classification #29281cars addedaddedFormula Ireland / Formula FX added to FX class, must comply with Table 1 notes.
  • FC Request for weight adjustments to equalize FC competition. #28888weightslower · weightFC Zetec engine minimum weight increases 20 lbs to 1220 lbs.
  • FX Request to be added to FX group #28991cars addedaddedFormula Ireland/Formula FX cars pending specification submission for possible FX table addition.
  • FX Request to classify FSV in FX #28057cars addedaddedEx-Pro Formula Super Vee added to FX with 1600cc VW engine, 1190 lb minimum weight, 6-inch front and 8-inch rear wheels.
  • FX Classify FormulaSPEED in FX #28715cars addedaddedFormulaSPEED with 2.0L Mazda MZR engine, 8in front/10in rear wheels, adjustable dual rear planes, 1350 lbs moves from FA to FX.
  • FX Request to remove tire marking language from FM #28415wordingwordingFX Formula Mazda no longer requires tire marking; must comply with December 2019 GCR rules.
  • FX Change to FX Table 1 #28322wordingunclearPro Formula F 2000 and USF2000 Tube Frame engine and car rules simplified; FC rules and FRP MAZDA MZR F2000 specs now apply directly.
  • FC Request for Better Zetec Connecting Rods #27710engineadded · engineFC allows Eagle #CRS5483F3D connecting rods alongside original Ford; crankshaft replacement clarified to original Ford only.
  • FC Add Alternate Piston #27795engineadded · engineFC allows Mahle #930169439 piston as new option alongside Ford original, Sealed Power #H872cp, United Engine and Machine #SO2763.
Virginia International Raceway Runoffs 20192019-10-051:51.200Robert Allaer · fastest of 10 · top 5 within 3.1s1:52.174Robert Allaer · fastest of 9 · top 5 within 2.7s141.8Robert Allaer
2 rule changes (FC: 2)2 wording · FC Wiseco piston and Crower rod part numbers updated; minimum weight unchanged at 976 grams. · FC Wiseco piston and connecting rod minimum weight corrected to 976 grams.showhide
  • FC E&O Wiseco piston and Crower connecting rod #26659wordingwordingFC Wiseco piston and Crower rod part numbers updated; minimum weight unchanged at 976 grams.
  • FC Correct Wiseco piston and connecting rod #25809wordingwordingFC Wiseco piston and connecting rod minimum weight corrected to 976 grams.
Sonoma Raceway Runoffs 20182018-10-101:32.571Timothy de Silva · fastest of 16 · top 5 within 1.8s1:34.053Mitch Egner · fastest of 12 · top 5 within 1.6s133.1Robert Armington
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:36.336Austin McCusker · fastest of 14 · top 5 within 2.3s1:36.890Tim Minor · fastest of 14 · top 5 within 3.8s
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:21.962John LaRue · fastest of 7 · top 5 within 2.6s1:22.049Nigel Saurino · fastest of 7 · top 5 within 3.0s
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-211:54.477Yufeng Luo · fastest of 11 · top 5 within 2.5s1:55.135Yufeng Luo · fastest of 10 · top 5 within 2.1s

By track

TrackEventsTypical % of FCBestLatest
Road America4100.0%100.0%Runoffs 2020100.0%Runoffs 2026
Virginia International Raceway3100.0%100.0%Runoffs 2019100.0%Runoffs 2023
Indianapolis Motor Speedway2100.0%100.0%Runoffs 2017100.0%Runoffs 2021
Daytona International Speedway1100.0%100.0%Runoffs 2015100.0%Runoffs 2015
Mid-Ohio Sports Car Course1100.0%100.0%Runoffs 2016100.0%Runoffs 2016
Sonoma Raceway1100.0%100.0%Runoffs 2018100.0%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 FC's best on the same day: the weather, the track and its configuration cancel out, so one figure compares across tracks and years where lap times cannot. 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.