STU at Virginia International Raceway

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: Michael Reece

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"

2022-01-01 STU Request to Add Honda K23 Spec Line

#30682 from David Mead · Rule change · TB 21-08 (2021-08 Fastrack)

In STU, classify Honda K23 as follows, effective 1/1/2022:
STU Maximum Displacement (cc's) Minimum Weight Notes
Honda K23 2354 Chart May use K24 block. Must maintain all K23
internals. Must use K23 cylinder head.
Maximum bore of 87mm.

2022-01-01 STU RE: Aug FT letter 30682

#31060 from David Mead · Rule change · TB 21-09 (2021-09 Fastrack)

In STU, Honda K23, change Notes as follows, effective 1/1/2022:
"Must maintain all K23 internals. use K23 crankshaft."

2022-01-01 STU Throttling Device Clarification

#31323 from Jose de Miguel · Rule change · TB 22-01 (2022-01 Fastrack)

In GCR, Section 9.1.4.1.B.4., change as follows:
"The intake and exhaust porting on piston engines is free. Porting of intake manifolds and cylinder heads is free on piston
engines."

2022-02-01 STU Request Allowance for Balance Shaft Delete in STU

#31434 from David Fiorelli · Rule change · TB 22-02 (2022-02 Fastrack)

In GCR, Section 9.1.4.G., add as follows"
"29. Any engine balance shafts and associated gears or pulleys may be removed and the resulting openings plugged (including
those in oil passages). Alternate pulleys or gears, of the same number as stock, may be installed in the location of the balance
shaft pulleys or gears if required for timing belt or chain operation; they must serve no other purpose. Any engine balance shafts
and associated gears or pulleys may be removed and the resulting openings plugged (including those in oil passages). Alternate
pulleys or gears, of the same number as stock, may be installed in the location of the balance shaft pulleys or gears if required for
timing belt or chain operation; they must serve no other purpose."

2022-02-01 STU Request Louvers in hood vents

#31916 from David Fiorelli · Rule change · TB 22-02 (2022-02 Fastrack)

In GCR, Section 9.1.4.1 A.2., add as follows:
“Louvers within the 200 sq. inch are allowed.”

2022-03-01 STU Single TB Weight Modifiers

#31449 from John Weisberg · Rule change · TB 22-03 (2022-03 Fastrack)

Effective 5.1.2022 In STU, GCR Section 9.1.4.H.1., change as follows:
"1. Minimum weights for cars with normally aspirated piston engines will be determined by 1.1 lbs/cc displacement for the
installed engine (see following table) the following table. Displacement is the stock displacement for the installed engine. For the
purpose of weight assignment, engine displacement will be rounded to the nearest 50cc (e.g., 2176cc = 2200cc and 2175cc =
2150cc)."
Factory Engine Displacement (cc) Minimum Weight (lbs)

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

2022-03-01 STU Request to Remove A4 1.8t from STU Spec Line Tables

#31465 from Chip Herr · Rule change · TB 22-03 (2022-03 Fastrack)

In STU Spec Lines, Table B, Audi A4 Turbo, change as follows:
Model: "Audi A4/VW 1.8 Turbo"
Minimum Weight: "Chart 3050"
Notes: "K04 turbocharger permitted. IHI VF30 turbo with 35mm turbo inlet restrictor permitted required."
In STU Spec Lines, Table B, Porsche 944 Max Disp. 1800, change as follows:
Minimum Weight: "Chart 3050"
Notes: "VW/Audi 1.8L 35mm turbo engine permitted inlet restrictor required."

Applies to Audi A4 on this page: Chip Herr

2022-03-01 STU Improved Touring Tires

#32063 from Greg Amy · Rule change · TB 22-03 (2022-03 Fastrack)

In STU Table B, Improved Touring Vehicles (1985-), change Notes as follows:
"Must completely conform to ITCS requirements. Tires must conform to 9.1.4, Tires & Wheels"
In STL Table B, ITA-spec and ITS-spec RX7, change Notes as follows:
"Must completely conform to ITCS requirements. Tires must conform to 9.1.4, Tires & Wheels"
In STL Table B, ITS, ITA, ITB, or ITC vehicles (1985- ), change Notes as follows:
"Must completely conform to ITCS requirements. Tires must conform to 9.1.4, Tires & Wheels"

2022-04-01 STU Request Adjustment to Min Weight for STU BMW E36 M3 (95-99)

#31535 from Griffin Gamcsik-Uly · Rule change · TB 22-04 (2022-04 Fastrack)

In STU Spec Lines, BMW E36 M3 (95-99), change as follows:
Car: "BMW E36 M3 (95-99) S52B32"
Maximum Displacement: "3200 3152"
Weight: "3200 3110"
Notes: "Engines are permitted 0.040 overbore, 0.5 point increase in compression. Engines must use the OEM
camshaft lift and stock intake plenum. "

Applies to BMW M3 on this page: Michal Kuna

2022-04-01 STU BMW E36 M3 Canadian (North American) S50B32 engine

#31866 from Ryan Hameetman · Rule change · TB 22-04 (2022-04 Fastrack)

In STU Spec Lines, BMW S50B32 Euro, classify as follows:
STU Maximum Displacement (cc's) Minimum Weight Notes
BMW S50B32 Euro 3201 3300 Engines are permitted 0.040 overbore, 0.5
point increase in compression. Engines
must use the OEM camshaft. Engine must
use stock intake plenum.

2022-04-01 STU Engine Swap Origin Country

#32209 from Jon McLendon · Rule change · TB 22-04 (2022-04 Fastrack)

In ST, GCR Section 9.1.41.G.2., change as follows:
Engines from vehicles not available in a car delivered in North America the United States will be considered and approved on a
case-by-case basis for use in ST. For an engine to be considered, a member must submit a classification request to the CRB with
the following information:

2022-04-01 STU CRX/Civic Del Sol

#32214 from Stephen Wheeler · Rule change · TB 22-04 (2022-04 Fastrack)

In STU, classify Honda CRX (84-91) as follows:
STU Maximum Displacement (cc's) Minimum Weight Notes
Honda CRX (84-91) Chart Ineligible for front wheel drive weight
reductions.
In STU, classify Honda Civic Del Sol (93-97) as follows:
STU Maximum Displacement (cc's) Minimum Weight Notes
Honda Civic Del Sol
(93-97)

2022-04-01 STU Error correction

#32383 from Super Touring Committee · Rule change · TB 22-04 (2022-04 Fastrack)

In STU, GCR Section 9.1.4.1.F.1, change as follows:
"Wheels may not exceed 18 inches in diameter and 8.0 inches in width for vehicles under 2950 lbs. base weight. Vehicles over
2951 with base weight equal to or over 2950 may use a 9 inch wide wheel."

2022-04-01 STU Single TB Weight Modifiers Add to Chart

#32393 from Club Racing Board · Rule change · TB 22-04 (2022-04 Fastrack)

Effective 5.1.2022 In STU, GCR Section 9.1.4.H.1., add to chart as follows:
Factory Engine Displacement (cc) Minimum Weight (lbs)
2450 2695 2596
2500 2750 2635
2550 2665 2675

2022-05-01 STU Opposed to the Proposed STU Weight Chart

#32381 from Edwin Soto-Quinones · Rule change · TB 22-05 (2022-04 Fastrack)

In STU, GCR Section 9.1.4.1.H, add the following after weight chart:
"Any STU car that qualified to run 9 inch wheels in 2021, may continue to run 9 inch wheels thru 2022 only."

2022-05-01 STU Clarification request for GCR 9.1.4.D.3.a Splitter Definition

#32414 from Bill Damron · Rule change · TB 22-05 (2022-04 Fastrack)

In ST Category Specifications, GCR Section 9.1.4.D.3.a, change as follows:
"Definition: A horizontal, single-plane aerodynamic device attached to the lower est point of the front of the vehicle, protruding
forward. It is intended to divert air and produce downforce through vertical pressure differential. A splitter shall have no vertical
deviations."

2022-07-01 STU Error in new minimum weight table when combined with other text

#32711 from Super Touring Committee · Rule change · TB 22-07 (2022-07 Fastrack)

In STU Specifications, GCR Section 9.1.4.1.H., eliminate the following in its entirety and renumber:
"2. Normally-aspirated engines with stock displacement 2976cc-3200cc that breathe through a single throttle body may reduce
base engine weight 10%."

2022-07-01 STU Redundant Language in May GCR

#32713 from Super Touring Committee · Rule change · TB 22-07 (2022-07 Fastrack)

In ST, GCR Section 9.1.4.G.29, change as follows:
"Any engine balance shafts and associated gears or pulleys may be removed and the resulting openings plugged (including those
in oil passages). Alternate pulleys or gears, of the same number as stock, may be installed in the location of the balance shaft
pulleys or gears if required for timing belt or chain operation; they must serve no other purpose. Any engine balance shafts and
associated gears or pulleys may be removed and the resulting openings plugged (including those in oil passages). Alternate
pulleys or gears, of the same number as stock, may be installed in the location of the balance shaft pulleys or gears if required
for timing belt or chain operation; they must serve no other purpose."

2022-08-01 STU Request Mazda 13 B turbo

#32668 from Raymond Philibert · Rule change · TB 22-08 (2022-08 Fastrack)

In STU Spec Lines, Table B: Alternate Vehicle and Engine Allowance, classify Mazda 13 B Turbo as follows:
STU Maximum Displacement (cc's) Minimum Weight Notes
Mazda 13B Turbo N/A Chart Limited to Streetport only. Stock turbos are
not allowed; only alternative turbos listed
in the STU rules are allowed.

2022-08-01 STU Hood Vents and Intercooler Scoops

#32733 from Patrick Lipsinic · Rule change · TB 22-08 (2022-08 Fastrack)

In STU, GCR section 9.1.4.1.A.2., add as follows:
"Louver vents that are OEM do not count in the number of vents allowed or 200 square inch allowance."

2022-08-01 STU Non 4 valve weight reduction removed

#32808 from Bjorn Stange · Rule change · TB 22-08 (2022-08 Fastrack)

In STU Specifications, GCR Section 9.1.4.1.H.1., change Chart as follows:
"Factory Engine Displacement (cc) - 2400
Minimum Weight (lbs) - 2596 2595"
In STU Specifications, GCR Section 9.1.4.1.H.1., add the following:
"Normally-aspirated engines of fewer than 4 valves per cylinder may reduce base engine weight 9%."
In STU Specifications, GCR Section 9.1.4.1.H., remove the following and renumber:
"4. All Direct Injected (DI) Turbocharged engines will be limited in preparation. DI Turbo engines must use OEM compression
ratios, OEM camshaft lift, and may not port the cylinder head."

2023-03-01 STU E&O STU NA Weight Chart.

#33737 from Eric Heinrich · Rule change · TB 23-03 (2023-03 Fastrack)

In STU, GCR Section 9.1.4.1.H.1. chart, Factory Engine Displacement (cc) Minimum Weight (lbs), change as follows:
"2450 2596 2595"
"2600 2860 2710"

2023-04-01 STU Alternate OEM Miata Intake Manifold

#33827 from Brandon Steinhauer · Rule change · TB 23-04 (2023-04 Fastrack)

In STU Spec lines, classify Mazda BP5A as follows:
STU Maximum Displacement (cc's) Minimum Weight Notes
Mazda BP5A 1839 Chart May use engine in its entirety or specific
components from the engine.

2023-07-01 STU 2022 Toyota GR Cup for STU

#34449 from Club Racing Board · Rule change · TB 23-06 (2023-05 Fastrack)

In STU Spec Lines, Toyota GR Cup (2022-), classify as follows:

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