This is a summary of
important SCCA Auto-X (Solo II) rules, with a special emphasis on
classes that the 2.5 RS and the WRX can run in, listing which popular
mods are allowed in which class.
It should answer the
some common question, but it does not replace the official rule book,
which contains the full details for all the points mentioned here, plus
many more rules.
There is also a number
of links to additional valuable resources at the bottom of this page.
Hope this helps....please consult the Rule Book for details.
Classes
Which class you are
running in is decided by the car model you drive, plus a category
depending on the modifications you make to your car. With increasing
levels of modifications, a logical progression is from Stock category
(cars with no or minimal modifications) over Street Touring, Street
Prepared to Street Modified. There are categories beyond Street
Modified (Prepared, Modified) that are not within the scope of this
document.
The possible
classes for a 2.5 RS are:
Stock: GS
Street Touring: STS (STX, STU)
Street Prepared: DSP
Street Modified: SM
The possible
classes for a WRX are:
Stock: DS
Street Touring: STX (STU)
Street Prepared: ESP
Street Modified: SM
The possible
classes for an STi are:
Stock: AS
Street Touring: STU
Street Prepared: BSP
Street Modified: SM
Prepared: FP
The possible
classes for a Forester XT are:
Stock: DS
Street Touring: STU
Street Prepared: ESP
Street Modified: SM
The possible
classes for a Legacy 2.5GT are:
Stock: DS
Street Touring: STU
Street Prepared: ESP
Street Modified: SM
One essential principle
is common to all the rules: If a modification is not explicitly
authorized by the rules, it is not allowed, no matter how trivial it
seems.
Stock Rules (DS, GS)
The following
modifications are allowed in stock class:
Port installed options: rear spoiler, diff protector, armrest extension
(specifically allowed in February '03 FasTrack, the general rules allow
factory options only).
-Appearance, comfort
and convenience options, e. g. gauges, alarms, turbo timers, shift
knobs.
-Removal of spare tire,
tools and jack.
-Harness (seat belts
cannot be removed).
-Any DOT approved tires
(see rules for restrictions), including R-compounds, of any size (no
modification of fender well).
-Wheels (stock size
only, offset within 0.25" of stock).
-Wheel spacers
(resulting offset within 0.25" of stock).
-Lug nuts.
-Brake pads, speed
bleeders.
-Shocks that maintain
stock ride height, can be adjustable. See rule book for details!
-Front sway bar.
-Different alignment
using factory adjustments (no camber bolts).
-Spark plugs.
-Air filter element can
be removed or replaced.
-Cat-back exhaust.
STS Rules
All
modifications from the Stock rules are allowed, except for:
Tires only up to 225 width, and at least 140 tread wear rating.
In addition, the
following modifications are allowed:
-Remove air condition.
-Pedal covers.
-Seat (fully
upholstered seating surface, must weight at least 15 lbs).
-Removal of factory
emblems (debadging).
-Rolling of inside
fender lip.
-Addition of body kits.
-Replace rear wing and
bumper covers (wings up to 8 square feet).
-Wheels up to 7.5"
width, any diameter.
-Cross drilled and/or
slotted brake rotors (standard size).
-Brake lines, e. g.
stainless steel.
-Air ducts for brakes.
-Disabled ABS (not
removed).
-Shocks (fewer
restrictions than stock). No electronic adjustment, like Tein EDFC!
-Springs (can be height
adjustable, e. g. coilovers).
-Any suspension
bushings, non-metallic.
-Any differential mount
bushings, non-metallic.
-Any subframe mount
bushings, non-metallic.
-Adjustable camber
plates (caster adjustment allowed).
-Camber bolts.
-Adjustable front
control arms (only if no front camber plates or camber bolts are used).
Must have non-metallic bushings, spherical bearings are not allowed.
-Adjustable rear
lateral links (only if no rear camber plates or camber bolts are used).
Must have non-metallic bushings, spherical bearings are not allowed.
-Rear sway bar, mounts,
end links
-Strut bars (not
triangulated).
-Battery, relocation of
battery (to trunk).
-Air Intake.
-Headers.
-Reprogrammed ECU or
piggyback that controls ignition and fuel by modifying inputs to ECU.
-Short-throw shifter.
-Crankshaft and
accessory pulleys.
-Engine mounts
(non-metallic).
STX Rules
All
modifications from the STS rules are allowed. In addition, the
following modifications are allowed:
-Tires up to 245 width.
-Wheels up to 8.0"
width.
-Brake rotors (diameter
equal or larger than factory, ferrous or aluminum alloy).
-Brake calipers
(original attachment point).
-Brake dust shield
modifications to accomodate alternate rotors and calipers.
-Uppipe (can be
catless).
-Turbo-back exhaust.
Must contain at least one (high-flow) cat placed not more than 6" after
the original exit of the last factory cat.
-ECU reprogramming. Map
must have unaltered factory boost maps.
-Piggyback, see STS. No
changes to boost control are permitted. Examples of allowed devices:
Vishnu Unichip, Cobb Unichip without Boost Control Unit, Apexi S-AFC.
Examples of illegal devices: TurboXS Unichip (controls boost), UTEC
(acts as a standalone for timing control).
STU Rules
All
modifications from the STX rules are allowed. In addition, the
following modifications are allowed:
Wheels of any width (tire width still limited to 245 for AWD vehicles).
Street Prepared Rules
(DSP/ESP)
All
modifications from the STU rules are allowed, except for:
-Removal of factory
emblems (debadging).
-Body kits (only front
and rear spoiler allowed).
-Non-standard brake
rotors and calipers.
-Front control arms and
rear lateral links.
In addition,
the following modifications are allowed:
-Some
updating/backdating with parts from different model years, see rule
book for details.
Modification (e. g. rolling, cutting) of fenders for tire clearance.
Adding of fender flares.
-Seat (fully
upholstered seating surface).
-Remove seatbelt for
replacement with harness that meets safety restrictions.
-Any steering wheel.
-Front spoiler.
-Rear spoiler.
-Removal of
radio/stereo.
-Any DOT approved tires
(see rules for restrictions), including R-compounds, of any size.
-Wheels of any size and
offset.
-Cross drilled and/or
slotted brake rotors (ferrous, standard size, no two-piece).
-Brake cylinder.
-Fuel injectors and
pump.
-Intercooler (including
hoses).
-Intake water injection.
-Turbo-back exhaust (no
cats required).
-Clutch (metal).
-Flywheel (metal).
-Shifter and shift
linkage, e. g. short throw shifter.
-Transmission mounts
(non-metallic).
-Differentials.
-Standalone engine
management for non-turbo car (?).
-Port matching (see
rule book).
Street Modified
Consult the rule book
for details of the Street Modified rules. Street Modified inherits all
allowances from Street Touring and Street Prepared. The following does
not attempt to list all additional modifications that are legal in this
class, it just lists a few popular mods that are common in Street
Modified, but not allowed in Stock, Street Touring or Street Prepared:
-Certain replaced body
parts: e. g. carbon fiber hood, fenders.
-Larger hood scoop,
hood scoop splitter.
-Removed rear seats.
-Suspension control
arms, lateral and trailing links.
-Metal bushings,
subframe bushings.
-Different/updated
turbo.
-Blow-off valve.
-Intercooler water
spray (?).
-Any kind of boost
control (MBC, EBC).
-Any other changes to
boost control, like the popular resistor mod.
-Engine management
systems that modify boost, e. g. Unichip with boost control unit, as
sold by TurboXS and Cobb, UTEC, or reflashed ECU with altered boost
maps.
-Standalone engine
management.
-Internal engine
modifications.
-Engine transplant with
different Subaru engine.
-Different/updated
transmission.
-Steering rack.
Beyond Street Modified
Consult the rule book
for Prepared and Modified categories. The following list is just a
reminder of a few popular mods that are not allowed in Stock, Street
Touring, Street Prepared or Street Modified, they will put you into
Prepared/Modified classes where you will be competing with race cars:
-Replaced body parts
not allowed in SM: e. g. trunk lid, STi bumper beams (?).
-Weight reduction not
explicitly allowed in SM: e. g. gutted interior, removed heater,
wipers, lights.
-Tires that are not DOT
approved (racing slicks).
-Anti-Lift Kit
(relocates suspension mounting points).
-Braces other than
strut tower braces: triangulated braces (V-braces), lower arm braces.
Not Allowed In Any Class
The following are not
allowed in any class:
-Nitrous (bottles not
allowed on event sites for safety reasons).
Uncertain Mods
No clear rules are
currently available for the following popular mods:
-Ground wire mod.
Common
Questions
-Can I run 17" wheels
in Stock on my WRX? They are a factory option!
-No, the 17" wheels are
a dealer installed option, and are not allowed in Stock.
-Why is my XYZ mod
illegal? I ran with it all year, and tech never said anything!
-Tech inspection is
only responsible for checking if your car is safe. Properly classing
your car is your own responsibility. Unless somebody files a protest,
nobody will check if you have illegal mods for your class. Even if
nobody ever protests, many people think that running with illegal mods
is unfair and shows a lack of respect for your fellow competitors.
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