STU at Indianapolis Motor Speedway

2019-01-01 STU Request to Equalize Direct Injected Turbo Cars

#24890 from Kevin Koelemeyer · Rule change · TB 19-01 (2019-01 Fastrack)

In STU, Table A, add engine as follows:
STU Maximum
Displacement (cc’s) Minimum Weight Notes
Honda
K20C1
Turbo I4
1996 CC 3025 36mm TIR Required.

2019-03-01 STU Request to Class Assignment for 2017 Civic

#24287 from Frank Woody · Rule change · TB 19-03 (2019-03 Fastrack)

In STU, classify the Honda Civic Si (2017-) as follows:

A specification table follows in the original; it is not shown here.

2019-03-01 STU Request to run E46 3246cc in STU

#25126 from Joshua Lion · Rule change · TB 19-03 (2019-03 Fastrack)

A specification table follows in the original; it is not shown here.

2019-03-01 STU Engine Classification for Rotary

#25564 from Luis Rivera · Rule change · TB 19-03 (2019-03 Fastrack)

In STU, table B, Mazda 13B, add to the notes as follows:
“May use 13B RE or REW housings and intake with turbo removed.”
In STU, table B, Mazda 13B Bridge Port, add to the notes as follows:
“May use 13B RE or REW housings and intake with turbo removed.”

2019-03-01 STU K24/K20 Head Swap Clarification/Amendment

#25899 from Evan Consolazio · Rule change · TB 19-03 (2019-03 Fastrack)

In STU, Honda K24, table B, add to the notes as follows:
“May use intake part #s 17100-RRB-A00, or 17100-PRB-A10.”

2019-03-01 STU Request to Classify 12a Bridge Ported Rotary Engine

#25985 from Christopher Harris · Rule change · TB 19-03 (2019-03 Fastrack)

In STU, add Mazda 12 A Bridge port to table B as follows:

A specification table follows in the original; it is not shown here.

2019-03-01 STU World Challenge Car Eligibility

#26387 from Super Touring Committee · Rule change · TB 19-03 (2019-03 Fastrack)

In STU, GCR section 9.1.4.B.2.c, strike the wording as follows:
“Weight will be set at the greater of the World Challenge weight plus 5% or the STU rules
weight plus 5%.”

2019-03-01 STU Request a phone call for discussion regarding weight

#26398 from Angelica Sprehe · Rule change · TB 19-03 (2019-03 Fastrack)

In STU, 9.1.4.1.H.6., strike the wording in the table as follows:
“AWD/ RWD cars must reduce restrictor 1 mm from this table.”

2019-03-01 STU Advanced Aero E&O

#26413 from Super Touring Committee · Rule change · TB 19-03 (2019-03 Fastrack)

In STU, 9.1.4.1.A.3.b., add the wording as follows:
“A wing no wider than the widest part of the body (Not including the mirrors), with a maximum
cord length of 12”, and end plates that do not exceed 72.0 square inches each. The wing may
be no higher than roof height.”

2019-04-01 STU Request to Use Japanese Mazda 13b Intake Manifold

#25790 from Luis Rivera · Rule change · TB 19-04 (2019-04 Fastrack)

In GCR section 9.1.4.1 Table B, add to notes as follows:
STU Maximum
Displacement (cc’s)
Minimum
Weight Notes
Mazda 13B
NA 2300
Street porting allowed, contact SCCA Technical

2019-04-01 STU Request Alternate Intake for Mazda MZR In a Rear Wheel Drive App.

#26352 from John Weisb · Rule change · TB 19-04 (2019-04 Fastrack)

In GCR section 9.1.4.1, Table A, Mazda MZR (LF, L3, L5), add to notes as follows:
“May use Goodwin Part # 61-2510 Intake manifold. Must use stock throttle body or Acura part
number 16400-PND-A17.”

2019-04-01 STU E&O Suspension

#26424 from Super Touring Committee · Rule change · TB 19-04 (2019-04 Fastrack)

In GCR section 9.1.4.1.E, remove wording as follows:
“7. Alternate suspension components including spindle, knuckle, hubs, etc. sourced from the
same manufacture are permitted.”
In GCR section 9.1.4.1.D, add wording as follows:
“7. Alternate suspension components including spindle, knuckle, hubs, etc. sourced from the
same manufacture are permitted.”

2019-04-01 STU Revisit B20 VTEC

#26530 from Super Touring Committee · Rule change · TB 19-04 (2019-04 Fastrack)

In STU, GCR section 9.1.4.1 Table B, classify the Honda/Acura B20 as follows:
STU Maximum
Displacement
(cc’s)
Minimum
Weight Notes
Honda/Acura B20 1973 Chart May use Cylinder Head and Intake Manifold from VTEC
B16 or B18 engine. Manifold must be from same as the

2019-04-01 STU Move Flared Fenders to STU Advanced Aero

#26564 from Super Touring Committee · Rule change · TB 19-04 (2019-04 Fastrack)

In GCR section 9.1.4.C.10, remove as follows:
“OEM base model body fenders may be flared to allow for tire clearance up to 2” with a weight
penalty of 1%. They must maintain the OEM profile and appearance, seamlessly around the
wheel arch.”
In GCR section 9.1.4.1.A.3, add as follows:
“d. OEM base model body fenders may be flared to allow for tire clearance up to 2” with a
weight penalty of 1%. They must maintain the OEM profile and appearance, seamlessly
around the wheel arch.”

2019-04-01 STU TCA Civic SI E&O

#26606 from Super Touring Committee · Rule change · TB 19-04 (2019-04 Fastrack)

In GCR section 9.1.4.1, Table B, Honda Civic Si TCA (2017-), add to notes as follows:
“37mm TIR required as of 6-1-19.”

2019-04-01 STU S54 Spec line

#26620 from Super Touring Committee · Rule change · TB 19-04 (2019-04 Fastrack)

In GCR section 9.1.4.1 Table B, BMW E46 S54 OEM, make changes to the spec line as
follows:
STU Maximum
Displacement (cc’s) Minimum Weight Notes
BMW
E46 S54B32
OEM
3246 3300 Cannot use Super Touring engine allowances

2019-05-01 STU Request Ride Height Clarification

#26597 from SCCA Staff · Rule change · TB 19-05 (2019-05 Fastrack)

In GCR Appendix K.F.5, add as follows:
“Ride height will be measured without driver at the lowest point of the rocker panel, not
including the pinch weld.”
In GCR section 9.1.4.F.5, add as follows:
“Ride height will be measured without driver at the lowest point of the rocker panel, not
including the pinch weld.”

2019-05-31 STU Request to clarify afterrmarket side skirts exhaust exit

#26814 from Patrick Lipsinic · Rule change · TB 19-06 (2019-06 Fastrack)

In GCR section 9.1.4.D.6, add as follows:
"Aftermarket side skirts may be used provided they meet the minimum ride height rule of 3 inches, have no
openings/ducts in them other than for jacking insert(s), or side exit exhaust, are no wider than the approved
fascias, do not extend any higher than the bottom of the door and do not reinforce the chassis."

2019-05-31 STU Wheel Flare wording

#26872 from Super Touring Committee · Rule change · TB 19-06 (2019-06 Fastrack)

In GCR section 9.1.4.1.A.3.d, make changes as follows
"OEM base model body Each fender may be flared to allow for tire clearance up to 2” with a weight penalty of
1%. The flare must maintain the OEM profile and appearance, seamlessly around the wheel arch. Material may be
added, or removed as necessary to create flare."

2019-07-01 STU Remove -2mm penalty from SR20DET Nissan

#26982 from Super Touring Committee · Rule change · TB 19-07 (2019-07 Fastrack)

In STU, Nissan SR20DET, Table B, make changes as follows:
STU Maximum Displacement
(cc's) Minimum Weight Notes

2019-07-01 STU Request clarification for manifold and throttle in STU

#27004 from Jose De Miguel · Rule change · TB 19-07 (2019-07 Fastrack)

In STU, GCR section 9.1.4.1.B.3, make changes as follows:
"All cars shall use the installed engine’s or vehicle's stock air throttling device (e.g.,
throttle body, carburetor) and intake manifold, unless noted otherwise. Alternate intake
manifolds will be permitted on a case-by-case basis."

2019-08-31 STU Request to correct E&O advanced aerodynamics

#27290 from SCCA Staff · Rule change · TB 19-09 (2019-09 Fastrack)

In STU, GCR section 9.1.4.1..A.3.b., make changes as follows:
"A wing assembly no wider than the widest part of the body (Not including the mirrors), with a
maximum cord length of 12”, and end plates that do not exceed 72.0 square inches each. No part
of T the wing assembly may be no higher than roof height."

2019-12-01 STU Request for an electronic throttle body

#27342 from Paul Azan · Rule change · TB 19-12 (2019-12 Fastrack)

In GCR section 9.1.4.G.8, make changes as follows:
"Cars produced with an electronic throttle body may use the OEM electronic throttle body. The OEM
electronic throttle body may be converted to manual actuation and the actuation cam on a manual
throttle body may be changed to alter the opening/closing rate of the butterfly. Alternately actuated
throttle bodies may be considered on a case by case basis. Vehicle/engine combinations with manual
OEM throttle bodies may be converted to an OEM electronic throttle body of the same inner diameter as
the original OEM throttle body."

2020-03-01 STU Please Modify the STU Wheel Size Rule for Clarity

#27694 from David Fiorelli · Rule change · TB 20-03 (2020-03 Fastrack)

In STU, GCR section 9.1.4.1.F.1., change base weight as follows:
"Vehicles over 2950 2951 base weight may use a 9 inch wide wheel."
Note: Other requests in this letter are not recommended.

2020-03-01 STU Turbo Engine Cars Base Weight

#28032 from Jose De Miguel · Rule change · TB 20-03 (2020-03 Fastrack)

In STU, GCR section 9.1.4.1.H.6., change as follows:
"All turbocharged engines shall use a turbo inlet restrictor. Vehicle minimum base weight is determined
by TIR size selected from the following table. Turbocharged engines of greater than 2.7L displacement
shall use the weight either as listed in the lbs/cc or restrictor size/lbs charts, whichever is greater.
Turbocharged engines utilizing Direct Fuel Injection (DI) shall increase their minimum base weight by
3%."

2020-04-01 STU Request to approve Honda S2000 HKS supercharger

#27281 from Matt Spicuzzi · Rule change · TB 20-04 (2020-04 Fastrack)

In STU, Honda S2000 (2000 Maximum Displacement) Spec Lines, change notes as follows:
"HKS Supercharger kit 12001-AH006 and 12001-AH010, allowed"
In STU, Honda S2000 (2157 Maximum Displacement) Spec Lines, change notes as follows:
"HKS Supercharger kit 12001-AH006 and 12001-AH010, allowed"

2020-04-01 STU Request BoP on the Lotus

#27637 from Eric Heinrich · Rule change · TB 20-04 (2020-04 Fastrack)

In STU, Lotus Elise Cup R Spec Lines, change weight as follows:
"2200 2300"
In STU, Lotus Elise SC/ LotusExige SC Spec Lines, change weights as follows:
"2200 2300"
"2400 2500"

2020-04-01 STU Turbo Inlet Restrictor On MK5 Volkswagen

#27704 from Joshua Fitzpatrick · Rule change · TB 20-04 (2020-04 Fastrack)

In STU, classify the Volkswagen GTI/GLI MK5 as follows:
"May install TIR in the OEM turbo inlet housing. Must comply with all TIR specification."
In STU, Volkswagen Jetta Mk4 Spec Lines, add to Notes as follows:
"May install TIR in the OEM turbo inlet housing. Must comply with all TIR specification."
In STU, add Spec Line, Volkswagen GTI/GLI MK5:
STU Maximum
Displacement (cc's) Minimum Weight Notes
Volkswagen

2020-04-01 STU Honda K20C1 removal

#27732 from SCCA Staff · Rule change · TB 20-04 (2020-04 Fastrack)

In STU, Honda K20C1 Turbo I4 Table A, change Notes as follows:
"36 35mm"

2020-04-01 STU Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0

#27884 from David Mead · Rule change · TB 20-04 (2020-04 Fastrack)

In STU, GM Ecotech LNF Spec Lines, add to Notes as follows:
“LNF Engine Permitted with turbocharger removed. LNF Engine short block with LE5 cylinder head and
intake manifold permitted. Must meet all other STL specifications.”

2020-04-01 STU Alternate Engine for Porsche 944

#28259 from Tim Pitts · Rule change · TB 20-04 (2020-04 Fastrack)

In STU, classify the Porsche 944 as follows:
STU Maximum Displacement
(cc's) Minimum Weight Notes
Porsche 944 1800 Chart VW/Audi 1.8L turbo engine
permitted.
Porsche 944 2000 Chart VW/Audi 2.0L turbo engine
permitted.

2020-06-01 STU Rotary Help

#27833 from Nick Leverone · Rule change · TB 20-06 (2020-06 Fastrack)

In STU, Mazda 13B Bridge Port, add Spec Line as follows:

A specification table follows in the original; it is not shown here.

2020-07-01 STU Request for Alternate Intake Manifold

#26514 from Jon McLendon · Rule change · TB 20-07 (2020-08 Fastrack)

Thank you for your letter. This change is not recommended.

2020-07-01 STU Request for Addition to GT3 Approved Turbo List

#27576 from Chris Edens · Rule change · TB 20-07 (2020-08 Fastrack)

In GT3, GCR section 9.1.2.F.7.h.6., add turbocharger as follows:
"d. Borg-Warner EFR6258"
In STU, GCR section 9.1.4.1.H.5, add turbocharger as follows:
"- Borg-Warner EFR6258"

2020-07-01 STU Request BoP for my Car

#29004 from Peter Federlin · Rule change · TB 20-07 (2020-08 Fastrack)

Thank you for the letter. Given the rule set for STU large displacement turbo engines are limited by the
turbos allowed in the GCR. We are forced to adhere to this turbo list to maintain parody in the smaller
displacement turbo engines. This engine may be more competitive prepared in non-turbo trim in STU or
inquire with T1 committee about running turbo trim.

2020-07-01 STU Sequential Shifters in STU

#29031 from Jeff Starkweather · Rule change · TB 20-07 (2020-08 Fastrack)

Thank you for your letter. The Club Racing Board is monitoring performance and adjusting as needed.
Recommended Items
The following subjects will be referred to the Board of Directors for approval. Address all comments,
both for and against, to the Club Racing Board. It is the BoD’s policy to withhold voting on a rules change
until there has been input from the membership on the presented rules. Member input is suggested and
encouraged. Please send your comments via the form at www.clubracingboard.com.

2020-08-01 STU Minimum Weight Determination

#27695 from David Fiorelli · Rule change · TB 20-08 (2020-08 Fastrack)

In STU, GCR section 9.1.4.10., add the following:
"All weight adjustments for engines shall be applied first, then that total is to be used as the baseline for
any chassis-related weight adjustments. Chassis related adjustment that are percentage based are
performed by adding specified percent first and subtracting specified percentage second if necessary.
Final step is addition or subtraction of specified weight in pounds."
In STL, GCR Section 9.1.4.4., add the following:
"All weight adjustments for engines shall be applied first, then that total is to be used as the baseline for
any chassis-related weight adjustments. Chassis related adjustment that are percentage based are

2020-08-01 STU ST Gurney flap Wicker clarification

#29012 from SCCA Staff · Rule change · TB 20-08 (2020-08 Fastrack)

In GCR section 9.1.4.D.4, clarify wording as follows:
"d. Wings shall be a single element with a maximum chord length of 8.50 inches, including
any wicker Gurney flap."
"f. The entire rear wing assembly, including the end plates and any wicker Gurney flap, shall be mounted
a minimum of 6.0 inches below the peak of the roof or roll cage main hoop whichever is higher,
measured at the highest point. Cars with a wagonback/notchback/hatchback style body may have the
rear wing assembly, including the end plates and any wicker Gurney flap, mounted a maximum of
4.0inches above the highest point of the roof."

2020-09-01 STU Request for Advanced Aero Rule Wording Clarification.

#29124 from David Mead · Rule change · TB 20-09 (2020-09 Fastrack)

In GCR, Section 9.1.4.1., remove d.:
"d. Each fender may be flared to allow for tire clearance up to 2” with a weight penalty of 1%. The flare must maintain the OEM
profile and appearance, seamlessly around the wheel arch. Material may be added or removed as necessary to create flare."
In GCR, Section 9.1.4.1., add 4. as follows:
"4. Fender Flare
Fenders may be flared up to 2" per corner with a total weight penalty of 1%. The flare must maintain the OEM profile and
appearance, seamlessly around the wheel arch. Material may be added or removed as necessary to create flare."

2020-12-01 STU Request clarification on wing measurement

#29640 from Jose De Miguel · Rule change · TB 20-12 (2020-12 Fastrack)

IN ST, GCR Section 9.1.4.D.4.e, add the following:
"Unless otherwise specified in the applicable rules the measurement of aero dynamic devices and reference areas shall include
end plates but not include fasteners as long as the fasteners serve no other purpose. Fasteners may protrude no more than 1/2”
from the mounting surface."

2021-01-01 STU 13B Rules Adjustment

#29333 from Nick Leverone · Rule change · TB 21-01 (2021-01 Fastrack)

In STU, remove Spec Line in entirety, Mazda 13B, weight 2300.
In STU, remove Spec Line in entirety, Mazda 13B Bridge Port, weight 2600.
In STU, classify Mazda 13B Street Port as follows:
STU Maximum Displacement (cc's) Minimum Weight Notes
Mazda 13B Street Port N/A 2400 Allow any dual throttle
body/bodies. Chokes must be
located within 4” of the throttle
butterfly. Auto-type 2bbl choke(s)

2021-02-01 STU Brake Component Relocation

#29990 from Christopher Childs · Rule change · TB 21-02 (2021-02 Fastrack)

In ST, Section 9.1.4.N.1., add the following:
"ABS actuation hardware and wiring may be relocated anywhere within the engine compartment."

2021-02-01 STU Porsche PDK

#30081 from Michael Kamalian · Rule change · TB 21-02 (2021-02 Fastrack)

In STU, GCR Section 9.1.4.1.C.2., change as follows:
"Transmission and ratios are free. Forward gears are limited to 6 speeds. Cars equipped with automatic transmissions using a
torque converter a re limited to 8 forward speeds. Cars with sequential shift transmissions including factory DCT-type systems
shall increase the required minimum weight by 3.5%."

2021-02-01 STU Reference Letter #29333 Proposed STU 13B Spec Line Changes

#30086 from Scott Peterson · Rule change · TB 21-02 (2021-02 Fastrack)

In STU, Spec Lines, Mazda 13B Street Port 2400 Min Weight, change Notes as follows:
"Allow any dual throttle body/bodies. Chokes must be located within 4” of the throttle butterfly. Auto-type 2bbl choke(s) with
any dual-Y manifold. Unrestricted"

2021-02-01 STU Drive Shaft Request

#30087 from Scott Peterson · Rule change · TB 21-02 (2021-02 Fastrack)

In GCR, Section 9.1.4.L.1., change as follows:
"Alternate differential housings are permitted from the same model of vehicle. Differential may be open, locked, or of a limited-
slip type. The internals of limited-slip type differentials may be modified to change the amount of slip limiting. Differentials with
external, or electric, adjustability are prohibited. Driveshaft and half-shafts may be aftermarket, but shall be the OEM-type and
use the same types of materials as stock steel or aluminum. Drive shafts may be replaced by one piece drive shafts, and
conversely."

2021-03-01 STU Super Touring Alternate Miata Hubs

#30345 from Club Racing Board · Rule change · TB 21-03 (2021-03 Fastrack)

In ST, GCR section 9.1.4.M, add alternate front wheel hubs as follows:
"18. Allow alternate front wheel front hubs for the 90-05 Mazda Miata:
Mazda Motorsports Development Part #0000-04-5HUB-S1"

2021-04-01 STU Provision for Interchangeable Engine Components Already Allowed

#30342 from Justin Taylor · Rule change · TB 21-04 (2021-04 Fastrack)

In STU Spec Lines, Honda S2000, add to Notes as follows:
"F20/F22 K24 Crank Shaft allowed, must use chart weight for achieved displacement."

Applies to Honda S2000 on this page: Rob Huffmaster, Kevin Lachance, Greg Goss, Seth Huntley

2021-04-01 STU ST Oil Coolers E&O Correction to 9.1.4.2.H

#30388 from Philip Royle · Rule change · TB 21-04 (2021-04 Fastrack)

In ST, section 9.1.4.G.14, change as follows:
"Vents, breathers, and oil filters and oil coolers may be added, or substituted. All emission control devices may be removed and
the resulting holes plugged."

2021-05-01 STU Request for Fender Flare Clarification

#30375 from David Mead · Rule change · TB 21-05 (2021-05 Fastrack)

In STU, section 9.1.4.1.A.4., change as follows:
"The exterior contour of all wheel openings Fenders may be flared up to a maximum of 2” per corner with a total 1% weight
penalty of 1%. The flare must maintain the OEM profile and appearance, seamlessly around the wheel arch. Material may be
added or removed as necessary to create flare. The fender/wheel opening or any other part of the body forming the wheel
opening, when viewed from the top perpendicular to the ground, must cover the portion of the tire that contacts the ground
while the car is at rest. The flaring of the exterior contour of any wheel openings may not alter the basic body configuration or
change the wheel opening size, location or shape when viewed from the side."

2021-07-01 STU STU Fender flares

#30696 from Patrick Lipsinic · Rule change · TB 21-07 (2021-07 Fastrack)

In STU, Section 9.1.4.1.A.4., change as follows:
"The flaring e of the exterior contour of any wheel openings may not change the wheel opening size, location or shape when
viewed from the side. The overall vehicle width may not exceed the manufacture's published width, plus 4"."

2021-07-01 STU Request weight reduction for 12A bridgeport motor in Miata

#30751 from christopher harris · Rule change · TB 21-07 (2021-07 Fastrack)

In STU Spec Lines Table B, Mazda 12A Street Port, change Notes as follows
"Induction: 1 Nikki 4 barrel carburetor with primary chokes bored to match secondary chokes on a stock manifold, or 1 Auto-
type 2 barrel carburetor with 42mm chokes on a "dual-y" manifold."
In STU Spec Lines Table B, Mazda 12A Bridge Port, change weight as follows:
"2550 2350"