#35041 AppK and AppK.1

before 1985 are eligible (e.g., if a model was produced in 1983-1988, the 1983 and 1984 cars are eligible). The SCCA does not guarantee
the competitiveness of any car.
Alternate allowances may be approved on a case-by-case basis for individual vehicles that do not meet these parameters; see “Alternate
Vehicle Allowances” tables. Engines components from these approved vehicle allowances may not be installed in other chassis without
specific line-item approval (e.g., the STU 3.8L Mustang engine may not be installed into a Ford Focus).
Vehicle modifications are limited to those listed herein. Unless a particular modification or part is approved in these rules, the vehicle and
all of its relevant parts and assemblies shall be stock for the correct make and model of car. Some amount of latitude will be considered to
facilitate engine installations, however if exten- sive modifications are required it is recom-mended to seek clarification from the Club
Racing Board.
Replacement parts may be obtained from sources other than the manufacturer provided they are the exact equivalent of the original
parts. The intent of this rule is to allow the competitor to obtain replacement parts from standard industry outlets, e.g., auto-parts
distributors, rather than from the manufacturer. It is not intended to allow parts that do not meet all dimensional and material specifications
of new parts from the manufacturer, unless otherwise allowed in the Super Touring category or class rules.
Each class will have a baseline target power-to-weight ratio. Weights may be adjusted or cars may be subject to changes in intake
restrictors to meet these targets. Cars may be required to carry data acquisition equip- ment for review of perfor-mance.
B. Eligibility
Vehicles meeting one of the following criteria may compete in the Super Touring category:
1.
1985 and newer cars built specifically under these ST rules
2.
World Challenge GT cars, with a VTS sheet dated 2009 or earlier, are eligible for classification under the following criteria:
a.Cars will be approved on a case-by-case basis with supporting World Challenge VTS documentation
b. Competitors must have the VTS sheet, as approved, available for scrutineers when requested.
c. Weight will be set at the greater of the World Challenge weight plus 5% or the STO rules weight plus 5%.
d. Cars approved to run in accordance with their World Challenge VTS must adhere to those specifications and are
not permitted to adopt general STU specifications.
e. See 9.1.4.2.I, table of Approved World Challenge Cars.
f. Cars must meet tire rule 9.1.4.P.1
Note: World Challenge VTS cars are subject to adjustments (i.e., weight, restrictor) as necessary.
C. Bodywork
1. Standard body appearance must be strictly maintained. Standard body appearance includes the OEM
grille and
badge. A photographic replica is not sufficient.
2.
Body and frame seams and joints may be welded. The OEM radiator supports may be replaced or reinforced to
make repairs easier. The radiator supports shall not reinforce the rest of the chassis or diminish the OEM crush
zones.3.
Bumper brackets may be modified, but bumpers must remain in OEM locations.
4.
Non-essential body items and trim may be removed including attaching brackets and supporting struc- ture. Any
holes in bodywork exposed by the removal of these items shall be covered or filled.
5.
All of the vehicle’s doors must be able to be opened from both inside and outside the vehicle. Latches and hinges for
the doors may be modified, but must remain in working order. Aftermarket latches and hinges may be used but shall
not protrude beyond outer surface of bodywork. The stock side impact beams may be removed when NASCAR style
door bars are installed.
6.
Hood and trunk pins, clips, or positive action external latches are permitted. Stock hood and trunk latches and hinges
may be disabled or removed; if so, a positive action external fastening method shall be used. Engine compartment
insulation may be removed.
7.
Openings in the bodywork may be temporarily covered, wholly or partially, with tape for the purpose of regulating
airflow. Bodywork openings may be closed off using close-out panels mounted behind body openings. Bodywork
seams may not be taped except to temporarily secure it after contact.
8.
All bodywork and windows shall be sufficiently rigid, adequately supported and properly secured such that it does
not noticeably flutter, move, or deform while vehicle is in motion.
9.
Aftermarket OEM style hardtops are allowed. Aftermarket carbon fiber hardtops are not allowed.
10. Fenders and wheel openings shall remain unmodified. OEM base model fenders may be flared to allow for tire
clearance up to 2”. They must maintain the OEM profile and appearance, seamlessly around the wheel arch. It is
permitted to roll under or flatten any interior lip on the wheel opening for tire clearance. Cars with plastic/composite
fenders may remove any interior wheel opening lip, but the resulting material edge shall be no thinner than the basic
fender material thickness. Non-metallic inner fender liners may be removed.
11.
OEM non-metallic composite body panels (i.e., plastic fascias, fiberglass hoods, etc.) may be replaced with
panels of any type composite, provided that the panel maintains the OEM profiles. All cars may replace the hood,
hatch, and/ or trunk/deck lid with nonmetallic composite parts. The hood may have heat exhaust vents installed in it.
Hood inlets (scoops) are not allowed. The vents shall not expose the mechanical components of the car when looking
down from above. The permitted transmission and differential coolers may vent through rear license plate frame.
There shall be a screen, painted the same color as the surrounding bodywork, covering the vent opening. Any OEM
non-functional, decorative vents/ducts may be made to be functional provided the exterior body appearance is not
modified.
12.
A close-out panel may be mounted behind the grille.
13.
OEM side skirts may be used if they were available on the car from the dealer provided they meet the
minimum ride height rule.14.
Aftermarket side skirts may be used provided they meet the minimum ride height rule, have no openings/ducts
in them other than for jacking insert(s), are no wider than the approved fascias, do not extend any higher than the
bottom of the door and do not reinforce the chassis.
15.
Canards or dive planes are not permitted unless part of the OEM bodywork.
D. Aerodynamic Devices
1.
Front Air Dam
a. A front spoiler/air dam may be added. It shall not protrude beyond the overall outline of the body when viewed
from above perpendicular to the ground, or aft of the forward most part of the front fender opening.
b. The spoiler/air dam shall be mounted to the body, and may extend no higher than four (4) inches above the
hori-zontal centerline of the front wheel hubs. The air dam shall have no support or rein- forcement extending aft
of the forward most part of the front fender wheel opening.
c. The minimum ride height of the air dam is 3.0 inches.
d. Openings are permitted for the purposes of ducting air to the brakes, cooler(s), and radiator(s).
2.
Undertray
a. An undertray may be added. The undertray may close out the underbody from the leading edge of the approved
bodywork (including air dam) back to the centerline of the front axle.
b. The minimum ride height of the undertray is 3.0 inches.
3.
Splitter
a. Definition: A horizontal, single-plane aerodynamic device attached to the lower 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.
b. A front splitter may be added. A maximum of 4 rods or cables may be used to support the front and/or sides of
the splitter. No other material(s) may be used external to the body to support the splitter.
c. The front splitter must not extend more than 2.0 inches past the original or approved bodywork as viewed from
above for the entire profile of the splitter.
d. No part of the splitter shall extend laterally any further than the widest point of the outside sidewall of the front
tires with the wheels pointed straight ahead.
e. The splitter shall not extend laterally any further than the widest point of the outside sidewall of the front tires with
the wheels pointed straight ahead. The splitter may not extend more than 2.0 inches beyond the bodywork, regard-
less of where the outside edges of the front tires are.
f. The splitter may have vertical deviations, fences, etc., only if they are part of the production body- work for street
use.
g. The minimum ride height of the front splitter is 3.0 inches.
4.
Rear Winga.
The wing shall be mounted to the trunk/deck lid with 2 mounting brackets. Each mounting bracket shall attach to the wing
at a point that is at least 2.0 inches inboard of endplates. The wing, and the portion of the mounting brackets located exter-
nally to the trunk/deck lid, may only be rein- forced by a diagonal strut having no aerodynamic effect, and/or by affixing the
external parts of the brackets to internal parts of the brackets within the trunk/cargo area. The internal parts of the brackets
may protrude through the trunk/deck lid to allow the two parts of each bracket to be fastened together.
b.
Factory wings, and spoilers, and roof vortex generators are permitted, but must be removed if an approved aftermarket
wing is installed. OEM aerodynamic devices do not need to adhere to the height rule
c.
Wings shall be a single element with a maximum chord length of 12.00 inches, including any Gurney flap.
d.
The entire wing assembly may be no wider than the widest part of the car, not including fender flares/lips and mirrors,
or a maximum width of 72.0 inches, whichever is the lesser.
e.
The entire rear wing assembly, including the end plates and any Gurney flap, shall be mounted level with, or below, the
peak of the roof. OEM aerodynamic devices do not need to adhere to the height rule.
f. The trailing edge of the rear wing may be mounted no further rearward than the center of the rear- most part of the
approved bodywork.
g. Wing end plates must not exceed 144.0 square inches each.
h. APR performance wing GTC-500 part #AS-1070xx, variable cord length 12.75” Inner/9” Outer), is permitted.
E. Interior
1. The following items must be removed: tool kit, spare tire, supplemental restraint systems (SRS) and passive
restraint systems.
2. The following items may also be removed:
Headliner, sun visor, carpeting, carpet pad and/or insulation, soundproofing, OEM seats, all trim except the dashboard, heating
and air conditioning systems, window winding mechanisms, central locking systems, audio system, and any other systems
fitted to the original car solely for the comfort of the driver and/or passengers.
3.
4.
The following items may be installed:
Safety equipment/structures, seat, controls necessary for driving, instrumentation, electronic equip- ment, radio, camera, battery, driver
cooling system, driver ventilation system, replacement door panels/ interior trim, anti-sway bar controls (not within reach of driver). None
of the above items may hinder driver exit from the car.5.
The above components shall be attached to/contained in the chassis in such a way as to be able to withstand 25g decel-
eration. Any sharp edges shall be covered, padded, protected, etc. to prevent injury to driver, crew, course workers,
and officials.
6.
The driver’s seat shall be located in the same lateral location as the OEM seat, unless otherwise allowed on a car’s
spec line. The transmission tunnel may be modified for the purpose of installing a competition driver seat. The floor
pan must remain in its original position. The floor pan must remain in its original position. The driver’s seat shall be
located longitudinally.
7.
Original instruments/gauges may be replaced, or supplemented, with additional engine monitoring gauges.
Accessories, lights and switches may be added or removed. Box-type extensions from the dash pad may be used to
mount switches and controls, in the areas where the OEM insert panels were mounted, so that they more easily
accessible to the driver. Audio and video systems may be removed.
8.
Vertical bulkheads, and enclosures, within the cockpit shall not be any higher than the bottom of the side windows,
and shall not extend more than 18.0 inches above the floor pan. No bulkheads shall cover the rear foot wells.
a. Sedan Body (4-door) and Hatchback Body (3-door) - Any bulkheads positioned in front of the plane determined
by the OEM rear seat back shall not extend laterally from one side of the chassis to the other, but rather shall only
be large enough to cover the individual components necessary.
b. Coupe Body (2-door) - Any bulkheads positioned in front of the plane determined by the OEM rear seat back, if
appli-cable, may extend laterally from one side of the chassis to the other.
c. Dash pad modification – It is permitted to modify the dash pad in order to run the roll cage tubes through the
dash area as long as the dash pad is modified only enough for roll cage fitment. If necessary, the dash pad may be
parted to ease installation around roll cage. Any such parting shall be done in such a way as to minimize the
appearance that they have been separated once pieces of dash pad are installed. The required dash pad may be
made of any material. The dash pad shall maintain the stock profile.
F. Chassis
1.
All cars shall have the OEM rear package shelf and/or rear seat back support structure installed if applicable. As an
alterna-tive, a metallic close out panel may be installed that simulates the rear package shelf and/or the rear seat back
support structure if applicable. If a close out panel is used to clean up the appearance of the rear package shelf and/or
rear seat bulkhead in conjunction with the OEM structure, the close out panel material is free.
2.
Cables, wiring and fluid lines in the engine compartment and cabin interior may be replaced, rerouted, and/ or protected.
3.
Cars that have drive shafts shall have 2 steel, 360-degree loops of sufficient strength located as close as possible to the
front and rear universal joints to prevent the driveshaft from dropping in case of failure of either universal joint. Floor
materials, torque tubes and cross members may also be utilized to provide this protection.
4.
It is permitted to attach one or more plates, or pads, under the car to provide for jacking of the car, provided they
serve no other purpose. It is prohibited to install any kind of device, which protrudes from the rocker panel or side
of the car. However, tubes may be attached to the roll cage or chassis and extend to the inner surface of the rocker
panel or bodywork to act as a receptacle for a jacking fixture. Air jacks are permitted, but no air source may be carried
on board.
5.
Ride height will be measured without driver at the lowest point of the rocker panel, not including the pinch weld.
6.
The OEM firewall between the cockpit and engine compartment shall be intact to prevent the passage of flames from
the engine compartment to the cockpit. Any holes in the firewall must be of the minimum size for the passage of
controls and wires, and must be completely sealed.
7.
Both front windows, driver and passenger, shall be down (preferably removed) whenever the vehicle is on track. The
OEM window opening on the front doors shall not be filled in with any material, other than the material required to
mount a NACA-duct for driver cooling. If used, the NACA-duct shall be mounted in the front, lower, corner of the
window opening. The area closed off to mount the NACA-duct shall not exceed 50 square-inches. In rain conditions,
a quarter window larger than 50 square-inches may be used in the area normally used to mount the permitted NACA-
duct, in an attempt to minimize the amount of water entering the cockpit. Enough open area for the driver to exit in an
emergency shall remain open at all times.
8.
All vehicles must use a stock, OEM equivalent, safety glass windshield, or 0.25 inch minimum thickness Lexan
replace-ment, mounted in the stock location, at the stock angle and maintaining the stock profile.
9.
Windshield clips, per GCR section 9.3 Windshield Clips/Rear Window Straps, are permitted and recom- mended.
10. Side windows, not including the front door windows, and rear windows may be replaced by clear Lexan- type
plastic material having a minimum thickness of 0.125 inch, but must retain the same shape, size, and location as the
original glass. NACA-ducts may be mounted in the side windows. The rear window must be secured by 2 additional
straps 1.0 inch wide by 0.0625 inch thick minimum, bolted or riveted to the body at both the top and bottom of the rear
window. If a Lexan rear window is mounted with multiple, evenly spaced screws around each side of its perimeter,
safety straps are not required. If a DOT spec glass rear window is used in conjunction with the OEM method of
mounting, safety straps are recommended, but not required.
11. Windows may be mounted and sealed with silicone. Any silicone used to bridge the gap between the perimeter
of the window and the chassis shall be neat in appearance and uniform in thickness. Tape may only be used to seal
the windows during wet track sessions for the purpose of reducing the amount of water entering the cockpit.
12.
OEM side window framework shall be intact.
13.
Acrylic or glass removable/moveable roof panels may be replaced with the same material as the surrounding
roof. All brackets, mounts, and moldings must be removed. Fabric tops are not permitted and shall be removed along
with all associated hardware. It may be replaced with an OEM hardtop if one is available.
14.
15.
Unused mounting tabs and brackets that are non-structural, excluding the rear seat back support and
package tray, may be removed.
16.
The OEM “rain gutter/tray” at the base of the windshield shall be intact and in the OEM location.
17.
The floor pan may be modified to provide clearance for the exhaust system and allowed alternate
transmission/trans-axle.18.
Inner fender panels may be modified or replaced.
19.
Convertible model cars may compete with a hardtop or as an open car.
20.
Fasteners are free. Fasteners may be replaced with adhesives.
21.
Rounded coverings may be used at the rear of the front window openings to bridge gap between the leading
edge of b-pillar and inner edge of main roll hoop. The material and design of these coverings is free, but shall be neat
in appear-ance and securely fastened.
22.
A third (3rd) tube on each side may extend through the firewall to the chassis in the engine compartment. These
tubes shall not extend forward of the shock towers.
23.
An underbody close-out panel(s) may be used in the area behind the rear axle. These panels shall not alter the
external appearance of the car when looking from the rear and sides of the car (i.e. we want to have to lay on the
ground to see them). If the production car uses underbody trim pieces, the OEM trim pieces may be removed or
replaced, but any close-out panel(s) used may not visually hide any more of the mechanical components, when looking
from the rear and sides of the car, than the OEM trim pieces do. The close-out panels shall not completely bridge the
gap between the rear floor pan area and the rear axle centerline. On rear engine cars, any close-out panels shall not
extend any further forward than the rear axle centerline. Cars with a fuel cell, engine, etc. that extend down into external
visual range shall fit the close-out panel(s) around the component in such a way that it does not alter the external
appearance of the car.
24.
Minimum ride height is 3.0 inches.
G. Engine
1.
Alternate engines may be used, if the manufacturer of the vehicleand engine are the same (e.g., an Acura engine
installed into a Honda car) and was available in a car delivered in the United States. Vehicles deliv- ered with engines
from other manufacturers (e.g. Morgan, Panoz, etc) may only use the originally installed engine, or another engine
manufactured by the chassis manufacturer (e.g. Lotus Elise may use the Toyota ZZ engine, or any other Lotus
manufactured engine that complies with the class rules, however a Lotus Esprit may not install a Toyota ZZ engine).
The chosen engine must retain its original cylinder head and intake manifold. Competitors must have in their possession a copy
of the factory shop manual for both the drivetrain and chassis for use by scrutineers. If an engine from a front wheel drive vehicle
is installed in a rear wheel drive vehicle, alternate OEM intake manifolds may be considered. The long block assembly of the alternate
engine must remain within the engine compartment with no modifications, however the firewall may be modified to provide
clearance for intake manifolds and/or engine accessories. It is permitted to use the OEM intake and throttle body for either the
chassis or the installed engine. If needed to allow the intake manifold fit on the engine, an adapter plate between the engine and
manifold is permitted. This adapter plate must be no more than
1.0 inch thick and must be made of the same material as either the head or intake manifold.
Engines from vehicles not available in a car delivered in 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 to the CRB a Vehicle Technical Specifications (VTS)
sheet with all engine parameters filled out. Copies of the appro- priate factory shop manual are also useful for this consideration.
Any deviations from the STCS that will be required for installation (e.g., trans adapter plate, alternate intake manifold, etc) must
be noted in the “Requested Non-Stock Allowances” section, otherwise they will not be allowed. Once this information is received
and considered, any approved engines will be noted in a separate table within the STCS.
1. The crankshaft shall be a stock OEM part or an aftermarket part as long as it is of identical dimensions and material
as the OEM part for the specific engine. The crankshaft may be balanced. The maximum weight reduction allowance
for balancing of the crankshaft is 0.5 lbs. The maximum weight reduction allowance for the balancing of the
reciprocating assembly is 15 grams. Alternate connecting rods are permitted, but must be ferrous unless OEM
supplied.
2. Blocks may be sleeved to repair cylinder walls. Engines may be bored to a maximum of .040 inch over standard bore size.
3. Rocker arm, lifter, follower, pushrod, valve spring, keeper, retainer, guide, seat, and valve materials are free; Titanium
is not permitted, except for retainers or OEM parts. The head may be machined to fit valve train
components.Alternate camshafts are allowed. Camshaft timing is free.
4. Cars produced with an electronic throttle body may use the OEM electronic throttle body. The OEM elec- tronic
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.
5. The ignition system is unrestricted.
6. A programmable ECU is permitted. Engine calibration (spark and fuel) is free.
7. Fuel injectors and fuel rails must maintain the original number and mounting locations, but are otherwise free. Fuel
pumps and fuel filters are free in type, size and number.
8. The location and type of the fuel pressure regulators are free provided they are mounted within the engine
compartment or the OEM location.
9. The oil pan and oil pickup may be baffled, modified, or replaced. The OEM oil pump may be modified, or replaced
with an OEM-style oil pump. Cars using a wet-sump oil system shall safety wire or in some other way secure the oil
drain plug.
10. Vents, breathers, and oil filters may be added, or substituted. All emission control devices may be removed
and the resulting holes plugged. It is recommended that cars using a wet-sump oil system safety wire or in some
other way secure the oil drain plug.
11.
12. Replacement gaskets and seals are free, including head gaskets. Replacement gaskets and seals must be made
out of material(s) designed to seal the parts of an engine. Replacement gaskets and seals may not perform any other
functions. Head gaskets may be used to adjust compression ratio.
13. The intake manifold on piston engines may be port matched to the head(s), provided no material is removed further
than one inch in from the manifold to head mounting surface(s).
14. Variable cam timing (VTEC, VANOS, etc.) and variable length intake manifolds may be partially, or wholly,
disabled. Variable cam timing systems that use multiple cam lobes for each valve(s) may remove lobes from the
camshaft(s) that are not being used. For 13B Rotary Engines the 5th and 6th intake port actuators and valves may be
removed or disabled.
15. To increase the compression ratio, the bottom of the head may be machined. Alternate pistons are permitted
and/or the pistons may be machined.
16. 17 Cars utilizing forced induction may not have a boost controller within reach of the driver. A car must enter pit
lane to have the boost level changed by the crew if necessary. Competitors must be prepared to demonstrate the
boost adjustment process to officials.
17. Engine parts, including, but not limited to, heads, intake manifolds and carburetors, may be cleaned using usual
methods (e.g., bead blasting, soda blasting, Scotch Brite pads) as long as part dimensions are not altered.
18. All cars shall use the installed engine’s stock air throttling devices (e.g., throttle body, carburetor) and intake
manifold, unless noted otherwise. Components upstream of the throttling devices are free.
19. Unless otherwise noted, the follow restrictions apply to turbochargers. The inlet restrictor (if required) shall be
posi-tioned in the compressor inlet housing. Turbochargers may be added to engines that did not originally come
equipped with one on a case by case basis. Swapping of turbochargers between engine makes and models is
prohibited. Super-charged cars may be approved on a case-by-case basis. Contact the Road Racing Technical Office
for details (contact info at the front of this book).
20. Alternate water pump, alternator, crankshaft dampers, and/or power steering pulleys are unrestricted. Crankshaft
pulley is unrestricted for all non-supercharged engines; supercharged engines must use OEM crankshaft and
supercharger pulleys.
21. Intake Requirements: All cars shall use the stock or approved air throttling device (e.g., carburetor, throttle body)
and intake manifold for the installed engine, unless noted otherwise.
22. All cars may fit the approved carburetor and manifold. The approved manifold may be ported and polished,
but its design and configuration shall not be altered in any other way. The lowering of or boring of holes in the center
divider is prohibited. Removal or obliteration of the manifold part number is prohibited.
a. The approved carburetor shall be a maximum of 650 cfm and 4 barrels. The approved optional insu- lator (Holley
#108- 12), and manifold (Edlebrock Performer RPM #7101-General Motors / #7121- Ford/Mercury) shall be fitted to
cars.
b. Except as permitted in these rules, the carburetor shall not be modified in any way. Any carburetor jets, accelerator
pump, pump cam, and accelerator pump nozzles may be used. Power valves, metering blocks, and floats may be
altered or replaced. No venturi (including secondary or auxil- iary) shall be modified in any way, but they may
be aligned. Idle holes may be drilled in the throttle plates (butterflies). Carburetors may be modified to allow “four
corner” idle adjustment.
c. The external throttle linkage to the carburetor may be modified or changed. Choke mechanisms, plates, rods, and
actuating cables, wires, or hoses may be removed. No removal or alteration of the carburetor air horn is permitted.
d. All air entering the intake tract shall pass through the carburetor air inlet.
24. Cars may modify, or replace, motor and gearbox mounts provided that the engine is located in the speci- fied location. This
includes the use of “torque plates”. All engines will be mounted in the stock position unless otherwise specified. Where
an engine setback is allowed, the OEM firewall may be modified only enough to accommodate the engine set back.
a. The following cars may set the engine rearward a maximum of 4.0 inches and may lower the engine a
maximum of 1.5 inches:
1. Cadillac CTS-V (04-07)
2. Pontiac GTO (04-08)
3. Ford Mustang (85-06)
4. GM F-Body (93-02)
25. The intake and exhaust ports on piston engines may be ported at a 1% weight penalty. The valve guide may be
machined as part of this porting.
26. Compression ratio is limited to 12.0:1.
27. Valve lift is limited to .600 inches.
28. Dry sump systems are allowed. The dry-sump system is limited to 5 stages. It shall consist of 1 pres- sure stage and a
maximum of 4 scavenge stages. If the OEM style pressure pump is used it shall count as the one permitted pressure stage.
There may be a maximum of 2 two-port scavenge stages, or a maximum of 4 single-port scavenge stages, or any combina-
tion such that oil is not being scavenged from more than a maximum of 4 locations.
H. Cooling Systems
1.
WaterCooling - Provided that the stock method of cooling is retained, the cooling system is free, including cooling
fans, but the water radiator must remain in the approximate OEM location. The mounting angle may be changed.
2.
Engine Oil Cooling- Coolers for the engine oil are free in number, type and location.
3.
Intake Air Cooling- Cars utilizing forced induction may install intercoolers. The number, type, and location of
intercoolers are free.
4.
Water Spray Systems- Water may not be sprayed on any intercoolers, radiators, etc. Water spray systems may only
be used to inject water into the brake ducts.
I. Fluid Piping & Fuel Tank
1.
Fuel Cells/Tanks- The use of a fuel cell is required unless the stock fuel tank is located between the axle centerlines
and within the main chassis structure (i.e., frame rails, etc.). All fuel cells must comply with GCR 9.3. Proper bracing
to protect the fuel cell in the event of a rear-end crash is required. If a fuel cell is installed in the rear hatch/rear trunk
area, the OEM floor pan in that area may be replaced with metal in order to make it easier to mount the fuel cell and
close out the area around the fuel cell.
2.
There must be a metal bulkhead completely separating the cockpit from the compartment containing the fuel cell.
This does not negate the requirement that the fuel cell bladder be contained in a metal container.
3.
No line containing engine coolant may pass through the cockpit. No hydraulic fluid lines may have remov- able
connectors inside the cockpit.
4.
All fluid hoses, lines, reservoirs, and tanks that are in the cockpit, or cargo area that is open to the driver, shall be sepa-
rated from the driver by rigid metallic and/or non-metallic enclosures and/or deflection shields to prevent fluid from
spraying on the driver in case of a leak. Magnesium is prohibited. Waterproof flexible wraps may also be used to
prevent fluid from spraying on the driver. The floor of these enclosures, or the area under the deflection shields, shall
be designed to prevent the accumulation of fluids.
5.
No fuel cooling devices are permitted in the car.
J. Oil System
If oil storage tanks are not located in the original position they must be surrounded by a 10 mm thick crushable structure.
Provided that the oil tank is not located in close proximity to the outer surface of the bodywork, and there is some of the structure
of the vehicle between the oil tank and the bodywork, the car’s structure will meet the 10mm crushable structure rule.
6. If the oil tank is located in the cockpit area, or a trunk area that is open to the driver, it must be sepa- rated from the
driver by a metal enclosure made up of .036 inch steel, or .059 inch aluminum. This is in addition to the 10mm thick
crushable structure that is required in section 9.1.4.I.2. The floor of the enclosure must be designed to prevent accu-
mulation of fluids.
7. Accusump-type systems may be used.
K. Exhaust System1.
The exhaust system may be modified, or replaced.
2.
Outlets must be located rearward of the midpoint of the wheelbase.
3.
The exhaust pipe may not protrude more than 3.0 inches at the point where it exits the bodywork. If the exhaust pipe(s)
exit the bodywork at the widest part of the body such that any extension of the exhaust pipe(s) beyond the body would
make pipe(s) the widest point, the exhaust pipe(s) must be trimmed flush (+/- 0.5 inch) with the bodywork at the
point that they exit the body. Minor body modifications are permitted to accommodate exhaust systems. Modifications
shall serve no other purpose. The underbody rocker panels may be modified for the installation of the exhaust system,
but these modifications may only serve to provide clearance for the exhaust system. The exhaust system must be
adequately isolated from the driver’s compartment.
4.
If the exhaust system is routed in such a way that damage to it could cause hot exhaust to contact any part of the fuel
system, there shall be a metallic heat shield protecting the fuel system components. This heat shield shall be located
at least 3.0 inches away from the exhaust system, and there shall be at least 3.0 inches between the heat shield and
the fuel system components.
L. Electrical System
1.
The electrical system is free provided that:
2.
Batteries are free, subject to GCR 9.3. Batteries.
3.
Standard headlights, headlight operating ancillaries, and parking light assemblies may be removed and replaced
with a plate of identical shape and size of the lens. Standard headlight assemblies may be replaced with aftermarket
units of equal dimension. Vehicles with pop-up and/or hidden headlights may modify and/or remove the headlight
assemblies as long as the headlight cover and any other external hardware are properly secured in the stock closed
location.
4.
Fog/driving lights, parking lights and associated attaching hardware may be removed. The resulting openings may be
used to duct air, or may be filled/covered. No ducting may extend beyond the outer surface of the bodywork.
5. Each car must be fitted with at least one effective windshield wiper assembly, which must be in working order
throughout the event. Wiper blades, arms and associated hardware may be substituted freely. Other windshield wiper
assemblies may be removed.
6. Each car must have an effective defogging/demisting system that is capable of keeping the windshield clear during
wet sessions. Anti-fog films meet this requirement.
M. Drivetrain
1.
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.
Differen-tials 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. Drive shafts may be replaced by one piece drive shafts, and
conversely.
2.
After market replacement differential housings are permitted as long as they are an exact equivalent.
3.
Vent and/or breather lines may be added to the transmission and/or differential. 1 transmission cooler and 1 differential
cooler are permitted.
4.
Alternate flywheels and clutches are permitted. Flywheel material shall be ferrous or aluminum and the ring gear diameter
must be the same as the OEM flywheel. Clutch and pressure plate design is free. Carbon clutches are permitted.
5.
Transmissions and ratios are free. Forward gears are limited to six speeds. Cars with aftermarket sequential shift
transmissions shall increase the required minimum weight by 100 lbs.
6.
Traction Control/Launch Control is permitted, but must operate solely through the engine managements system (i.e., spark
and fuel control) and may not interface with, or affect, the braking system or throttle control.
N. Suspension and Steering
1.
All suspension members must be made from ferrous and/or aluminum materials. Chromium plating of suspension
members is prohibited.
2.
Suspension springs are free. Coil-over units may be added to supplement or replace OEM springs. Attaching points may
be reinforced. It is permitted to use threaded spring seats for adjustability.
3.
Shock absorbers and struts are free. Driver adjustable systems and electronically controlled shocks are not permitted.
If a reservoir/adjustment canister is used, only one may be used per shock. The shocks at each individual wheel may not
be connected in any way.
4.
Stabilizer bars are free, and may be added, removed, or substituted. Driver adjustable stabilizer bars are not
permitted. Adjustment controls for stabilizer bars may be located within the cockpit, but must be out of the reach from
the driver’s seat. Adjustments to stabilizer bars during practice, qualifying and race must be done in pit lane.
5.
Suspension components shall be the stock OEM parts, but they may be reinforced. Spherical bearings are permitted
on suspension components. Standard suspension bushings may be replaced with solid or spherical bushings. Drop
spindles are allowed.
6.
Any anti-roll bar(s) and rear axle traction bar(s), rear axle panhard rod and watts linkage can be added or substi-
tuted, provided their installation serves no other purpose. The mounts for these devices can be welded or bolted to the car.
These devices and their mounts cannot be located in the trunk or driver/passenger compartment unless fitted as stock.
Rear axle traction bar(s) used to control axle housing rotation must be solid bar or tube.
7.
When a car’s anti-roll bar also acts as a suspension locating device, the bar’s attachment points and pivot points on
the chassis and suspension control arms must remain in their stock locations.
8.
Slotted plates may be added over original shock mounts on front and rear shock towers for camber/caster adjust- ment.
One bolt-in brace may connect the front strut towers, and one bolt-in brace may connect the rear strut towers.
9.
All steering components, with the exception of the steering wheel, column and tie-rods/toe-links, must be original
equipment supplied by the manufacturer. These parts may be strengthened provided the original part can still be
identified.
10.
Cars that come with a solid rear axle or trailing arm suspension are permitted an aftermarket or fabricated rear
suspen-sion. Cars with an altered rear suspension must add 50 lbs. Cars with live axle rear wheel drive may reduce the
minimum weight by 50 lbs
11.
Original suspension pick-up points below the upper line of the wheel rim must be used within a tolerance of
1.0 inch; however, if the lower suspension pickup point is changed from the OEM location, 50 lbs. must be added to the
car. The body/frame around the pick-up points may be reinforced; this reinforce- ment shall be limited to a radius of
6.0 inches. The 1.0 inch tolerance applies to pick-up points on the chassis only.
12.
Suspension mounting points above the upper line of the wheel rim must be retained within a tolerance of 3.0
inches, however, the body/frame around the pick-up points may be reinforced; this reinforcement shall be limited to a
radius of
6.0 inches. The 3.0 inch tolerance applies to pick-up points on chassis only.
13.
The spindle and/or outer joint on the a-arm and/or strut may be moved to correct bump steer caused by
changing the vehicle ride height. These components are not limited to the 1.0 inch of movement that applies to the
suspension pick-up points located on the chassis.
14.
The steering wheel may be replaced with an aftermarket, or racing steering wheel. Wood-rimmed steering wheels
are not permitted. An all-metal quick release coupling on the steering wheel may be added.
15.
A collapsible steering column shall be used. Most recent OEM steering columns have at least 2 universal joints in
them that allow the steering column to collapse on impact. This type of design (with at least 1 universal joint) must also
be used in any steering column extension(s) that may be used to reach the driver’s competition seating position.
16.
Power steering may be modified in any of the following ways:
a. Disconnected
b. an OEM manual steering rack for that model may be fitted
c. an electric power steering pump may be fitted
d. An OEM electric-assisted steering system may be used.
17. Cars that come with a solid rear axle or trailing arm suspension are permitted an aftermarket or fabricated rear
suspen-sion. Cars with an altered rear suspension must add 50 lbs.
Cars with live axle rear wheel drive may reduce the minimum weight by 50 lbs
18.
Original suspension pick-up points below the upper line of the wheel rim must be used within a tolerance of 1.0
inch; however, if the lower suspension pickup point is changed from the OEM location, 50 lbs. must be added to the car.
The body/frame around the pick-up points may be reinforced; this reinforce- ment shall be limited to a radius of 6.0
inches. The 1.0 inch tolerance applies to pick-up points on the chassis only.
19.
Suspension mounting points above the upper line of the wheel rim must be retained within a tolerance of 3.0 inches,
however, the body/frame around the pick-up points may be reinforced; this reinforcement shall be limited to a radius
of
6.0 inches. The 3.0 inch tolerance applies to pick-up points on chassis only.
20.
The spindle and/or outer joint on the a-arm and/or strut may be moved to correct bump steer caused by
changing the vehicle ride height. These components are not limited to the 1.0 inch of movement that applies to the
suspension pick-up points located on the chassis.
21.
Alternate control arms permitted.
O. Brakes
1.
Brake lines may be relocated, and rubber lines may be replaced with stainless steel braided brake lines. Hand brake
assem-blies may be removed. Brake proportioning valves may be used provided that they are of the in line, pressure
limiting type. Non-pressurized brake fluid lines and master cylinders need not be metal, metal shielded, or bulkheaded.
Pressur-ized brake fluid lines must be metal, metal shielded, or bulkheaded.
2.
Brake proportioning valves may be used provided that they are of the in line, pressure limiting type. Brake pad
friction material is free.3.
Hand brake assemblies may be removed. Backing plates and dust shields may be modified, ventilated, or removed.
4.
Brake duct inlets incorporated in the front spoiler as standard, or in light openings, other than head- lights, may be
used to duct air to the front brakes. Additionally, brake ducts may be fitted into the intermediate mounting surface
of a permitted splitter.5.
Water spray cooling systems are permitted. The amount of water carried for injection into the brake duct is free.
Water-cooled calipers are forbidden.
6.
Wheel fans are not permitted.
7.
When any allowed alternate calipers are used, calipers must be mounted in the same location and orientation as the
OEM calipers. OE caliper mounting tabs may be modified or removed to facilitate installation.
8.
Titanium piston inserts are permitted.
9.
Rotors- 1 or 2 piece ferrous rotors that do not exceed 355mm in diameter or 33mm in thickness are permitted.
Maximum brake rotor diameter of 380mm is permitted at a 100 pound penalty.
10.
Calipers- The standard production calipers or any caliper with 6 or less pistons may be used. 4-piston calipers
may use a maximum of 4 pads per caliper. 6-piston calipers are limited to 2 pads per caliper.
11.
Original equipment master cylinders and pedals may be replaced.
12.
Power assisted braking systems are permitted.
13.
The balance of braking forces between the two wheels on an axle shall be equal and non-adjustable.
14.
The balance of braking forces between the front and rear axles may only be adjusted by the driver through:
a. Direct intervention on the position of the center of the joint, on the linkage lever of the hydraulic pumps of the
front and rear circuits.
b. Direct intervention on a proportioning valve in which the intake pressure is adjusted through a pre- loaded spring.
P. Tires & Wheels
1.
Tires must conform to 9.3. Tires. GT1/ST tire make/size is free, DOT tires are not required. DOT tires per 9.3. Tires
are required for GT2/ST cars. Slicks allowed on all GT2/ST cars with a 100-pound weight penalty.
2.
Wheels / Hubs- The standard wheels may be replaced with direct, bolt-on racing/aftermarket wheels under the
following provisions:
a. Loose wheel spacers of any type are not recommended.
b. All cars must run the same size wheel on the same axle, unless otherwise specified.
c. As viewed from above at the centerline of the wheel; the fender shall completely cover the “tread” portion of the
tire. Only the tire sidewalls may be visible.
d. The wheel material is free, but they must be constructed of metallic material(s). No modifications (including
grinding) are permitted on a vendor-supplied wheel.
e. Valve stems and caps are free.
f. Approved slicks (competition wets) with 100 lb. penalty.
3.
Wheel Attachment
a. Center-locking type hubs and wheels may be used if vehicle is supplied with them from the manu- facturer. If
vehicle is not supplied with center-locking type wheels they may be used in conjunction with an adapter that
bolts onto the OEM, or approved, hub.
b. If a single wheel nut is used, a safety spring must be in place on the nut whenever the car is running and must
be replaced after each wheel change. These springs must be painted Day-Glo red or orange. Alternatively,
another method of retaining the wheels may be used provided it has been approved by FIA.
4.
Rear wheels may not exceed 18.0 inches in diameter and 13.0 inches in width. Front wheels may not exceed 18.0 inches
in diameter and 11.0 inches in width.