BoP Lab / Indianapolis Motor Speedway

FC vs GT1 vs FE pace at Indianapolis Motor Speedway

Quickest here: FC 1:36.336 Austin McCusker, Runoffs 2017 qualifying · GT1 1:35.279 Michael Lewis, Runoffs 2021 qualifying · FE 1:39.177 Elliot Finlayson, Runoffs 2017 qualifying

Lap times% of FC

FCGT1FEsolid race · dashed qualifying · slower is lower

FCGT1FEsolid 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

	Event	FC			GT1					FE
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs FC	% of FC	Qual best	Race best	Trap	vs FC	% of FC
	Runoffs 2021 ROFF212021-09-25	1:36.787Trent 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 Minor	1:35.279Michael Lewis · fastest of 20 · top 5 within 0.6s-0.729s (-0.76%)	1:53.220David Pintaric · fastest of 14 · top 5 within 3.8s+17.033s (+17.71%)	180.2Tom Smith	+16.240squal -1.508s	116.7%qual 98.4%
40 rule changes (FC: 7, GT1: 19, FE: 14)8 cars added · 6 weight · 3 tyres & wheels · 1 aero · 1 engine · 1 induction · 1 suspension & brakes · 19 wording · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix. · FE removes tire marking and qualifying session requirements for wet race starts; rain tire rules simplified. · FE radiator screens clarified: may not protrude more than ¼ inch in front of sidepods. · FE radiator screens allowed and recommended, positioned no more than ¼ inch from sidepod front vertical plane. · FC Pinto engine loses 10 lbs to 1190; Pinto aluminum head loses 10 lbs to 1190; Zetec loses 10 lbs to 1210. · FE front springs increase to 800 lbs ±25 lbs, rear springs decrease to 900 lbs ±25 lbs, Hypercoil parts required. · FC: Pectel T2 and Performance PE-3 ECU maps clarified; SCCA Club or 2013 Pro map required. · FE Gurney flap specs clarified: front wing secondary elements limited to .500" ± .030", wing elements to .250" ± .030". · 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. · GT1 adds Trans Am spec engines: Chevrolet R07, Ford FR9, Dodge R7, each with 50 lbs. weight penalty. · 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. · GT1 Gurney flap wicker clarification: terminology standardized from lips/tabs/wicker to flaps throughout specifications. · GT classes clarify Gurney flap wording, replacing wickerbill/tab terminology with flap; specifications unchanged. · FE Gurney flap wording clarified: permitted on front wing secondary elements only, not main plane. · FE spring rule update effective date moved from June 1 to November 1, 2020. · GT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications. · FE2 class created for 2.0L MZR engine at 1250 lbs minimum; FE 2.3L becomes Regional only through 2019 Runoffs. · GT2/ST Ford 5.0L Coyote 3rd Gen OEM added at 3200 lbs with Boss intake manifold permitted. · Factory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs. · GT1 sequential shifting transmission weight penalty reduced from 75 to 50 lbs. · GT1 non-18-inch-wheel cars now get 18-inch wheels with 50 lb penalty, down from 100 lb. · GT1 Spec Lines allows 5 Star NASCAR Camaro 2018+ body for General Motors Corporation. · 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. · FE and FE2 minimum weight increased to 1270 lbs including driver; spring options and tire warmer ban added. · FE wet tire rear width increases from 7.5 to 8.0 inches, Hoosier 44196 W3. · GT1 Porsche 944/968 classified: 2981cc twin turbo, 2585 lbs minimum weight. · FE removes American Racer tires, mandates Hoosier dry 22.0 x 8.0-13 FE front and 22.0 x 10.0-13 FE rear. · GT1 allows Trans Am rear wing, 12" chord, 72" span, 1/2" wicker, 100 sq in endplates, no weight penalty. · FE anti-roll bars may run disconnected; one link removable front, rear, or both for safety. · FE and FE2 Enterprise bubble tail P/N WM138014 newly allowed for both classes. · 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. · 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. · FE wet tires updated: front Hoosier 44195 W3 and rear 44217 W3, WET designation removed. · 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 2021-08-01 GT1 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. 2021-07-01 FE FE Tire Rule Changes #30754tyres & wheelsneutralFE removes tire marking and qualifying session requirements for wet race starts; rain tire rules simplified. 2021-07-01 FE Radiator Screens Clarification #30792wordingneutralFE radiator screens clarified: may not protrude more than ¼ inch in front of sidepods. 2021-06-01 FE FE Radiator Screens #30575wordingneutralFE radiator screens allowed and recommended, positioned no more than ¼ inch from sidepod front vertical plane. 2021-03-01 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. 2020-12-01 FE FE / FE2 Spring Updates #29689suspension & brakesneutralFE front springs increase to 800 lbs ±25 lbs, rear springs decrease to 900 lbs ±25 lbs, Hypercoil parts required. 2020-10-01 FC Urgent: SCCA PE3 map unsuitable #29475wordingneutralFC: Pectel T2 and Performance PE-3 ECU maps clarified; SCCA Club or 2013 Pro map required. 2020-10-01 FE FE Gurney Flap Spec Update #29445wordingneutralFE Gurney flap specs clarified: front wing secondary elements limited to .500" ± .030", wing elements to .250" ± .030". 2020-09-01 GT1 GT Category Wording #29193wordingunclearGT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. 2020-08-01 FC Request for weight adjustments to equalize FC competition. #28888weightslowerFC Zetec engine minimum weight increases 20 lbs to 1220 lbs. 2020-08-01 GT1 Request to Allow New Trans Am Legal Engines in GT1 #29002engineslowerGT1 adds Trans Am spec engines: Chevrolet R07, Ford FR9, Dodge R7, each with 50 lbs. weight penalty. 2020-07-01 GT1 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. 2020-07-01 GT1 STO Gurney flap wicker clarification #28883wordingneutralSTO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules. 2020-07-01 GT1 GT1 Gurney flap wicker clarification #28886wordingneutralGT1 Gurney flap wicker clarification: terminology standardized from lips/tabs/wicker to flaps throughout specifications. 2020-07-01 GT1 GT Gurney flap wicker clarification #28909wordingneutralGT classes clarify Gurney flap wording, replacing wickerbill/tab terminology with flap; specifications unchanged. 2020-06-01 FE FE Gurney flap wicker clarification #28885wordingneutralFE Gurney flap wording clarified: permitted on front wing secondary elements only, not main plane. 2020-05-01 FE FE spring rule update changed to November 1, 2020 #28814wordingneutralFE spring rule update effective date moved from June 1 to November 1, 2020. 2020-02-01 GT1 Windshield Clips #27323wordingneutralGT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications. 2020-01-01 FE Request for FE / FE2 preparation rules update #27722cars addedneutralFE2 class created for 2.0L MZR engine at 1250 lbs minimum; FE 2.3L becomes Regional only through 2019 Runoffs. 2020-01-01 GT1 Request to classify the Ford Coyote 3rd Gen OEM #27146cars addedneutralGT2/ST Ford 5.0L Coyote 3rd Gen OEM added at 3200 lbs with Boss intake manifold permitted. 2020-01-01 GT1 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. 2020-01-01 GT1 Request to Adjust Transmission Penalty #27750weightfasterGT1 sequential shifting transmission weight penalty reduced from 75 to 50 lbs. 2020-01-01 GT1 Request to Reduce Additional Weight for 18 #27751weightfasterGT1 non-18-inch-wheel cars now get 18-inch wheels with 50 lb penalty, down from 100 lb. 2020-01-01 GT1 Request for Five Star Nascar Compliant Bodywork #27756cars addedneutralGT1 Spec Lines allows 5 Star NASCAR Camaro 2018+ body for General Motors Corporation. 2019-12-01 FC Request for Better Zetec Connecting Rods #27710wordingneutralFC Zetec connecting rods now allow Eagle #CRS5483F3D in addition to original Ford. 2019-12-01 FC Add Alternate Piston #27795wordingneutralFC adds Mahle #930169439 piston as alternate option to existing Ford, Sealed Power, and United Engine choices. 2019-12-01 FE FE / FE2 Update Rules #27624weightslowerFE and FE2 minimum weight increased to 1270 lbs including driver; spring options and tire warmer ban added. 2019-10-01 FE FE Wet Tire E&O #27365tyres & wheelsfasterFE wet tire rear width increases from 7.5 to 8.0 inches, Hoosier 44196 W3. 2019-08-31 GT1 Request to classify Porsche 944/968 #26242cars addedneutralGT1 Porsche 944/968 classified: 2981cc twin turbo, 2585 lbs minimum weight. 2019-07-01 FE FE Tire Update #27029tyres & wheelsunclearFE removes American Racer tires, mandates Hoosier dry 22.0 x 8.0-13 FE front and 22.0 x 10.0-13 FE rear. 2019-07-01 GT1 Clarify Trans Am Legal Bodywork and Wing #26953aerofasterGT1 allows Trans Am rear wing, 12" chord, 72" span, 1/2" wicker, 100 sq in endplates, no weight penalty. 2019-05-31 FE FE Anti-Roll Bar Clarification #26912wordingneutralFE anti-roll bars may run disconnected; one link removable front, rear, or both for safety. 2019-05-31 FE FE / FE2 Updated Bubble Tail Rule #26913cars addedneutralFE and FE2 Enterprise bubble tail P/N WM138014 newly allowed for both classes. 2019-05-01 FC E&O Wiseco piston and Crower connecting rod #26659wordingneutralFC Wiseco piston and Crower connecting rod part numbers updated; minimum weight 976 grams. 2019-05-01 GT1 Request GTX Fuel injection for previous GT-1 tube frame cars #26141inductionfasterGTX tube frame cars gain fuel injection with 90mm maximum throttle body size. 2019-05-01 GT1 Request to Classify Ligier JS2 R #26535cars addedneutralLigier JS2 R classified in GTX, no performance parameters specified in filing. 2019-04-01 GT1 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. 2019-03-01 FE Request to Update Hoosier Rain Tire Part Number for the FE cars #26235wordingneutralFE wet tires updated: front Hoosier 44195 W3 and rear 44217 W3, WET designation removed. 2019-01-01 FC Correct Wiseco piston and connecting rod #25809weightslowerFC Wiseco piston and Crower connecting rod assembly minimum weight increases from 555 to 976 grams. 2019-01-01 GT1 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 ROFF172017-09-25	1:36.336Austin McCusker · fastest of 14 · top 5 within 2.3s	1:36.890Tim Minor · fastest of 14 · top 5 within 3.8s		1:36.008David Pintaric · fastest of 17 · top 5 within 2.2s	1:36.187Cliff Ebben · fastest of 16 · top 5 within 1.5s		-0.703squal -0.328s	99.3%qual 99.7%	1:39.177Elliot Finlayson · fastest of 35 · top 5 within 1.3s	1:39.726Elliot Finlayson · fastest of 35 · top 5 within 0.8s		+2.836squal +2.841s	102.9%qual 102.9%

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.