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BoP Lab / Indianapolis Motor Speedway

FC vs GT3 vs FX pace at Indianapolis Motor Speedway

Class · click a class to switch, + to compare alongside (up to 4)
AS+B-Spec+EP+F5+FA+FB+FC×FE+FE2+FF+FM+FP+FV+vsFX×GT1+GT2+vsGT3×GTL+HP+P1+P2+SM+SRF+SRF3+STL+STU+T1+T2+T3+T4+
Reference class · the others' laps as a share of this one's at the same event, so years compare despite weather; + a class above to measure against it

Quickest here: FC 1:36.336 Austin McCusker, Runoffs 2017 qualifying · GT3 1:44.579 Collin Jackson, Runoffs 2017 qualifying · FX 1:38.596 Vaughn Glace, Runoffs 2021 qualifying

1:361:381:401:421:441:4649 rule changes between Runoffs 2017 and Runoffs 202149 ▾FC race best at Runoffs 2017: 1:36.890 (Tim Minor)FC race best at Runoffs 2021: 1:36.980 (Simon Sikes)FC qualifying best at Runoffs 2017: 1:36.336 (Austin McCusker)FC qualifying best at Runoffs 2021: 1:36.787 (Trent Walko)GT3 race best at Runoffs 2017: 1:46.330 (Collin Jackson)GT3 race best at Runoffs 2021: 1:46.694 (Troy Ermish)GT3 qualifying best at Runoffs 2017: 1:44.579 (Collin Jackson)GT3 qualifying best at Runoffs 2021: 1:44.758 (Troy Ermish)FX race best at Runoffs 2021: 1:38.833 (Vaughn Glace)FX qualifying best at Runoffs 2021: 1:38.596 (Vaughn Glace)Runoffs 20172017Runoffs 20212021
FCGT3FXsolid race · dashed qualifying · slower is lower
100%102%104%106%108%110%49 rule changes between Runoffs 2017 and Runoffs 202149 ▾FC race best at Runoffs 2017: 100.0% of FC's (Tim Minor)FC race best at Runoffs 2021: 100.0% of FC's (Simon Sikes)FC qualifying best at Runoffs 2017: 100.0% of FC's (Austin McCusker)FC qualifying best at Runoffs 2021: 100.0% of FC's (Trent Walko)GT3 race best at Runoffs 2017: 109.7% of FC's (Collin Jackson)GT3 race best at Runoffs 2021: 110.0% of FC's (Troy Ermish)GT3 qualifying best at Runoffs 2017: 108.6% of FC's (Collin Jackson)GT3 qualifying best at Runoffs 2021: 108.2% of FC's (Troy Ermish)FX race best at Runoffs 2021: 101.9% of FC's (Vaughn Glace)FX qualifying best at Runoffs 2021: 101.9% of FC's (Vaughn Glace)Runoffs 20172017Runoffs 20212021
FCGT3FXsolid 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, higher is quicker
EventFCGT3FX
Qual bestRace bestTrapQual bestRace bestTrapvs FC% of FCQual bestRace bestTrapvs FC% of FC
Runoffs 2021 ROFF212021-09-251:36.787Trent 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 Minor1:44.758Troy Ermish · fastest of 14 · top 5 within 4.6s+0.179s (+0.17%)1:46.694Troy Ermish · fastest of 13 · top 5 within 4.1s+0.364s (+0.34%)145.8Stacy Wilson+9.714squal +7.971s110.0%qual 108.2%1:38.596Vaughn 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%
49 rule changes (FC: 7, GT3: 31, FX: 11)16 cars added · 10 induction · 4 weight · 2 engine · 1 aero · 1 tyres & wheels · 14 wording · 1 other · FX USF2000 Tube Frame allows Hoosier radials 20.5x7.0x13 front and 22.5x8.0x13 rear, FC-compliant shocks, Wilwood brakes, Bosch spark plugs. · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix. · GT3 now permits current FP spec line cars to compete while maintaining their full FP rule set. · FX USF2000 Tube Frame now allows any Hoosier radial tire 20.5x7.0x13 front, 22.5x8.0x13 rear. · FX adds 2000-2009 Formula Renault 2.0 / Fran-Am 2000 classified at 1250 lbs with sealed 2.0L Renault F4R 832 engine. · GT3 Mazda MZR 2.0L fuel induction restrictor increases from 31 to 32 mm. · GT3 Mazda Renesis and 13B Bridgeport choke reduced from 44mm to 42mm. · FC Pinto engine loses 10 lbs to 1190; Pinto aluminum head loses 10 lbs to 1190; Zetec loses 10 lbs to 1210. · Formula Renault 2.0 (2010–2017) newly classified in FX, must comply with Table 1 notes. · FX FormulaSPEED FS2.0 specification requirements updated; World Speed Inc. deadline removed, compliance now per SCCA website. · GT3 Mazda MZR and MZR/L5-VE fuel induction sizing changes from 31 to 32. · GT3 Honda Prelude 1992-1997 classified, 2dr FWD, 104 inch wheelbase. · FC: Pectel T2 and Performance PE-3 ECU maps clarified; SCCA Club or 2013 Pro map required. · Formula Ireland / Formula FX added to FX classification under Table 1 with compliance notes. · GT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. · FC Zetec engine minimum weight increases 20 lbs to 1220 lbs. · Formula Ireland/Formula FX car addition to FX Table 1 pending specification submission; not recommended. · GT3 Mazda 12A Peripheral Port added to rule set, 2300 cc, 2292 lbs. · TA2 Gurney flap wording clarified: terminology standardized to 'Gurney flap', height limits and thickness specifications remain 0.50 inch / 0.625 inch or 0.375 inch / 0.0625 inch depending on configuration. · STO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules. · GT classes clarify Gurney flap wording, replacing wickerbill/tab terminology with flap; specifications unchanged. · GT3 4v SIR 4-cylinder engines across multiple brands increase fuel induction from 31 to 32. · GT3 and STU add Borg-Warner EFR6258 to approved turbocharger list. · GT3 Nissan KA24E loses permission to use 32mm chokes at 2280 lbs for 2011-2012 only. · Ex-Pro Formula Super Vee classified in FX with 1190 lbs minimum weight, 1600cc or 1835cc VW engine, 6in front and 8in rear wheels. · FormulaSPEED reclassified from FA to FX with 2.0L Mazda MZR engine, 1350 lbs minimum weight, sealed ECU and dampers. · FX Formula Mazda no longer requires tire marking; must comply with December 2019 GCR rules. · GT3 Mazda MZR L5-VE gets 31mm SIR restrictor, weight up from 1950 to 2195 lbs, direct injection banned. · Pro Formula F 2000 Tube Frame engine now must follow current FC rules with restricted ECU map, cams, and air restrictor required. · GT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications. · Factory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs. · GT3 Mazda 13B Bridgeport restrictor reduced from 44mm to 42mm. · GT3 Alfa Romeo 4C classified with 1742cc engine, 33mm TIR restrictor, 2325 lbs minimum weight. · GT3 Mazda MZR/L5-VE gets unrestricted induction, drops 245 lbs to 1950, limited to GT2 prep. · GT3 Honda K20C1 turbocharged engine added with 33 mm TIR restrictor, 2350 lbs minimum weight. · GT3 wing end plates change from 11.00 by 4.00 inches rectangle to maximum 64 square inches. · FC Zetec connecting rods now allow Eagle #CRS5483F3D in addition to original Ford. · FC adds Mahle #930169439 piston as alternate option to existing Ford, Sealed Power, and United Engine choices. · GT3 Nissan adds SR16VE engine, 1596cc, 1690 lbs, unrestricted induction. · GT3 Mazda 12A Bridgeport gains optional 42mm choke at 2010 lbs minimum weight. · FC Wiseco piston and Crower connecting rod part numbers updated; minimum weight 976 grams. · GTX tube frame cars gain fuel injection with 90mm maximum throttle body size. · Ligier JS2 R classified in GTX, no performance parameters specified in filing. · GT3 Mazda 13B and Renesis engines reclassified with new weight specs ranging 2080–2350 lbs. · GT1 and GT2/GT3/LITE ride height requirements removed from GCR sections 9.1.2.D.5.a.1 and 9.1.2.F.7.b. · GT3 13B and Renesis rotaries gain 200 lbs minimum weight; 13B Peripheral Port to 2400, Bridge Port to 2400, Renesis Peripheral Port to 2450, Bridge Port to 2450. · GT3 adds Mitsubishi 4G69 SOHC 2378cc engine, 2195 lbs minimum weight, 31mm SIR. · FC Wiseco piston and Crower connecting rod assembly minimum weight increases from 555 to 976 grams. · GTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified.showhide
  • FX Rules Adjustment #30950otherneutralFX USF2000 Tube Frame allows Hoosier radials 20.5x7.0x13 front and 22.5x8.0x13 rear, FC-compliant shocks, Wilwood brakes, Bosch spark plugs.
  • GT3 Request to Update GTA Obsolete Part Numbers #30615wordingneutralGTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix.
  • GT3 Request to Permit FP cars in GT3 #30611cars addedneutralGT3 now permits current FP spec line cars to compete while maintaining their full FP rule set.
  • FX FX/FRP Tire Rule #30723tyres & wheelsneutralFX USF2000 Tube Frame now allows any Hoosier radial tire 20.5x7.0x13 front, 22.5x8.0x13 rear.
  • FX Classify the 2000-2009 Formula Renault 2.0 / Fran-Am 2000 #30460cars addedneutralFX adds 2000-2009 Formula Renault 2.0 / Fran-Am 2000 classified at 1250 lbs with sealed 2.0L Renault F4R 832 engine.
  • GT3 Mazda MZR 2.0L Engine #30455inductionfasterGT3 Mazda MZR 2.0L fuel induction restrictor increases from 31 to 32 mm.
  • GT3 Disfranchised GT3 Mazda, correct choke size #30570inductionslowerGT3 Mazda Renesis and 13B Bridgeport choke reduced from 44mm to 42mm.
  • FC Request for FC Weight Change #30171weightfasterFC 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 addedneutralFormula Renault 2.0 (2010–2017) newly classified in FX, must comply with Table 1 notes.
  • FX Update specifications for FormulaSPEED cars #29674wordingneutralFX FormulaSPEED FS2.0 specification requirements updated; World Speed Inc. deadline removed, compliance now per SCCA website.
  • GT3 Mazda MZR SIR Sizing #29555inductionfasterGT3 Mazda MZR and MZR/L5-VE fuel induction sizing changes from 31 to 32.
  • GT3 Request to Classify 1992-1997 Honda Prelude #29687cars addedneutralGT3 Honda Prelude 1992-1997 classified, 2dr FWD, 104 inch wheelbase.
  • FC Urgent: SCCA PE3 map unsuitable #29475wordingneutralFC: Pectel T2 and Performance PE-3 ECU maps clarified; SCCA Club or 2013 Pro map required.
  • FX Follow up to to Letter#28991 Request for FX classification #29281cars addedneutralFormula Ireland / Formula FX added to FX classification under Table 1 with compliance notes.
  • GT3 GT Category Wording #29193wordingunclearGT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line.
  • FC Request for weight adjustments to equalize FC competition. #28888weightslowerFC Zetec engine minimum weight increases 20 lbs to 1220 lbs.
  • FX Request to be added to FX group #28991cars addedneutralFormula Ireland/Formula FX car addition to FX Table 1 pending specification submission; not recommended.
  • GT3 Request to add Mazda 12A Peripheral Port to GT3 rule set #28842cars addedneutralGT3 Mazda 12A Peripheral Port added to rule set, 2300 cc, 2292 lbs.
  • GT3 TA2 Gurney flap wicker clarification #28874wordingneutralTA2 Gurney flap wording clarified: terminology standardized to 'Gurney flap', height limits and thickness specifications remain 0.50 inch / 0.625 inch or 0.375 inch / 0.0625 inch depending on configuration.
  • GT3 STO Gurney flap wicker clarification #28883wordingneutralSTO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules.
  • GT3 GT Gurney flap wicker clarification #28909wordingneutralGT classes clarify Gurney flap wording, replacing wickerbill/tab terminology with flap; specifications unchanged.
  • GT3 GT3 4v SIR size increase. #28931inductionfasterGT3 4v SIR 4-cylinder engines across multiple brands increase fuel induction from 31 to 32.
  • GT3 Request for Addition to GT3 Approved Turbo List #27576wordingneutralGT3 and STU add Borg-Warner EFR6258 to approved turbocharger list.
  • GT3 Request Nissan KA24E specifications #28808inductionslowerGT3 Nissan KA24E loses permission to use 32mm chokes at 2280 lbs for 2011-2012 only.
  • FX Request to classify FSV in FX #28057cars addedneutralEx-Pro Formula Super Vee classified in FX with 1190 lbs minimum weight, 1600cc or 1835cc VW engine, 6in front and 8in rear wheels.
  • FX Classify FormulaSPEED in FX #28715cars addedneutralFormulaSPEED reclassified from FA to FX with 2.0L Mazda MZR engine, 1350 lbs minimum weight, sealed ECU and dampers.
  • FX Request to remove tire marking language from FM #28415wordingneutralFX Formula Mazda no longer requires tire marking; must comply with December 2019 GCR rules.
  • GT3 Error Regarding Mazda Engine Listing #28119induction +245 lbsslowerGT3 Mazda MZR L5-VE gets 31mm SIR restrictor, weight up from 1950 to 2195 lbs, direct injection banned.
  • FX Change to FX Table 1 #28322engineslowerPro Formula F 2000 Tube Frame engine now must follow current FC rules with restricted ECU map, cams, and air restrictor required.
  • GT3 Windshield Clips #27323wordingneutralGT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications.
  • GT3 Request Factory Five Daytona coupe classification #26308cars addedneutralFactory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs.
  • GT3 Request restrictor size change request #26958inductionslowerGT3 Mazda 13B Bridgeport restrictor reduced from 44mm to 42mm.
  • GT3 Request to Classify Alfa Romeo 4C #27322cars addedneutralGT3 Alfa Romeo 4C classified with 1742cc engine, 33mm TIR restrictor, 2325 lbs minimum weight.
  • GT3 Request for Mazda 2.5l MZR/L5-VE #27570induction -245 lbsfasterGT3 Mazda MZR/L5-VE gets unrestricted induction, drops 245 lbs to 1950, limited to GT2 prep.
  • GT3 GT3 turbo engines add Honda #28033cars addedneutralGT3 Honda K20C1 turbocharged engine added with 33 mm TIR restrictor, 2350 lbs minimum weight.
  • GT3 GT3 wing end plate #28035aerounclearGT3 wing end plates change from 11.00 by 4.00 inches rectangle to maximum 64 square inches.
  • FC Request for Better Zetec Connecting Rods #27710wordingneutralFC Zetec connecting rods now allow Eagle #CRS5483F3D in addition to original Ford.
  • FC Add Alternate Piston #27795wordingneutralFC adds Mahle #930169439 piston as alternate option to existing Ford, Sealed Power, and United Engine choices.
  • GT3 Request to Add SR16VE to GT-3 Spec Lines #27357cars addedneutralGT3 Nissan adds SR16VE engine, 1596cc, 1690 lbs, unrestricted induction.
  • GT3 Requesting Increase in Choke Diameter for Mazda 12A Bridgeport #27043inductionfasterGT3 Mazda 12A Bridgeport gains optional 42mm choke at 2010 lbs minimum weight.
  • FC E&O Wiseco piston and Crower connecting rod #26659wordingneutralFC Wiseco piston and Crower connecting rod part numbers updated; minimum weight 976 grams.
  • GT3 Request GTX Fuel injection for previous GT-1 tube frame cars #26141inductionfasterGTX tube frame cars gain fuel injection with 90mm maximum throttle body size.
  • GT3 Request to Classify Ligier JS2 R #26535cars addedneutralLigier JS2 R classified in GTX, no performance parameters specified in filing.
  • GT3 26076 revised Spec line chart #26528engineunclearGT3 Mazda 13B and Renesis engines reclassified with new weight specs ranging 2080–2350 lbs.
  • GT3 Request Ride Height Clarification #26600wordingneutralGT1 and GT2/GT3/LITE ride height requirements removed from GCR sections 9.1.2.D.5.a.1 and 9.1.2.F.7.b.
  • GT3 Request clarification on bridge porting for rotary #26076weightslowerGT3 13B and Renesis rotaries gain 200 lbs minimum weight; 13B Peripheral Port to 2400, Bridge Port to 2400, Renesis Peripheral Port to 2450, Bridge Port to 2450.
  • GT3 Request to add 4G69 Mitsubishi #26154cars addedneutralGT3 adds Mitsubishi 4G69 SOHC 2378cc engine, 2195 lbs minimum weight, 31mm SIR.
  • FC Correct Wiseco piston and connecting rod #25809weightslowerFC Wiseco piston and Crower connecting rod assembly minimum weight increases from 555 to 976 grams.
  • GT3 GTX Homologation table update #26034cars addedneutralGTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified.
Runoffs 2017 ROFF172017-09-251:36.336Austin McCusker · fastest of 14 · top 5 within 2.3s1:36.890Tim Minor · fastest of 14 · top 5 within 3.8s1:44.579Collin Jackson · fastest of 17 · top 5 within 5.0s1:46.330Collin Jackson · fastest of 15 · top 5 within 3.1s+9.440squal +8.243s109.7%qual 108.6%

Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it, how many cars set a time that session and how close the top five were; a best from fewer than three cars is greyed. With two or more classes, "vs" is the gap of each class's best to the first class's at the same event. "% of FC" is the class's best as a share of FC's best at the same event (100% is level, less is quicker): weather and track condition move every class together, so this compares across years where the raw times do not. It still breaks when FC's own field changes or one session was wet and another dry. Newest event first. The coloured figure under each value is the change from the previous event that has one (green is quicker, red slower). Whole laps only, so events with different sector layouts still compare. Weather and track condition are not accounted for.