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Autox Rules: Read this first, then ask questions.
Quick Categories Reference List:
Stock Evo X: B Street
Lightly modded: STU
Engine modifications: ASP or SM
*Disclaimer* This is not a guarantee for each car.
This is a summary of important SCCA Autox (Solo) rules, listing which popular mods are allowed in each category. It should answer the most common questions, but it does not replace the Official rule book, which contains the full details for all the points mentioned here, plus many more rules.
Categories
With increasing levels of modifications, a logical progression is from Street category (cars with no or minimal modifications) to Street Touring, Street Prepared, then Street Modified. There are categories beyond Street Modified (Prepared, Modified) that are not within the scope of this document.
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.
B Street Rules
• Tires: Must be UTQG treadwear 200 minimum rating
•Wheels: Any type wheel may be used provided it complies with the following:
A. It is the same width as standard and as installed it does not have an offset more than ±¼” (±6.35mm) from a standard wheel for the car. The resultant change in track dimensions is allowed.
B. Wheel (rim) diameter may be increased or decreased 1” from the standard part.
• Appearance, comfort and convenience options
• Removal of spare tire, tools and jack.
• Harness (seat belts cannot be removed), must be DOT approved.
• Lug nuts.
• Brake pads, speed bleeders.
• Shock absorbers, struts and strut housings that maintain stock ride height, can be adjustable. See 13.5 in the rule book for details!
• Front or rear sway bar, but not both.
• Different alignment using factory adjustments (no camber bolts).
• Spark plugs.
• Air filter element can be removed or replaced.
• Cat-back exhaust.
STU Rules
All Solo® Rules Street Category allowances, plus all allowances contained in Section 14. In addition, the following modifications are allowed:
• Wheels of any width (tire width limited to 265 for AWD vehicles and with a treadwear rating of 200 or higher).
Interior
• Pedal covers.
•The driver and front passenger seats may be replaced with the following restrictions. The seating surface must be fully upholstered. The top of the seat, or an attached headrest, may not be below the center of the driver’s head. The seat, including mounting hardware, must weigh at least 25 pounds and must be attached using the OE body mounting holes/studs. Additional mounting points may be added.
•Any steering wheel may be used. An alternate steering wheel assembly, including all mounting hardware, which replaces an airbag-equipped wheel is not required to have an airbag but must weigh at least as much as the standard assembly. An alternate wheel is not required to have a horn button.
Exterior
• Debadging
• Rolling of inside fender lip.
• Addition of spoilers, splitters, rear wings, bumper covers, valances, side skirts, and non-functional scoops/vents is allowed provided that either:
1. It is a production part which is standard or optional equipment of a US model of the vehicle. (“Model” is defined in Section 12.3.)
2. It is listed in the vehicle manufacturer’s US accessory catalog for that vehicle for normal highway use. This does not allow for parts sold through a manufacturer’s performance catalog.
Brakes
• Cross drilled and/or slotted brake rotors (standard size).
• Brake lines may be substituted with alternate DOT-approved flexible brake lines.
• Air ducts for brakes.
• Disabled ABS (not removed).
• Brake rotors (diameter equal or larger than factory, ferrous material).
• Brake calipers (original attachment point).
• Brake dust shield modifications to accommodate alternate rotors and calipers.
Suspension
• Shocks (fewer restrictions than stock).
• Springs including coilovers.
• Any suspension bushings, non-metallic.
• Any differential or mount bushings, non-metallic.
• Any subframe mount bushings, non-metallic.
• Adjustable camber plates (caster adjustment allowed).
• Camber bolts.
• Adjustable front control arms and rear lateral links (only if no front camber plates or camber bolts are used). Must have non-metallic bushings, spherical bearings are not allowed.
• Strut bars (not triangulated).
• Limited Slip Differentials
STU – Only standard (as defined in Section 12.4) limited slip differentials (LSD) are allowed on AWD vehicles. For AWD vehicles that did not come with any type of limited slip differential (including center differential or transfer case), a single aftermarket mechanical LSD may be added.
Power
• Uppipe (can be catless).
• Air Intake.
• Headers.
• Short-throw shifter.
• Crankshaft and accessory pulleys.
• Engine mounts (non-metallic).
• Any high flow catalytic converter(s) are allowed, and multiple catalytic converters may be replaced by a single unit. The inlet of the single replacement converter may be located no further downstream than 6" along the piping flow path from the original exit of the final OE converter.
• ECU reprogramming. Map must have unaltered factory boost maps.
• No changes to boost control are permitted.
ASP Rules
Cars listed as eligible in and prepared to the current Street Touring® category rules are permitted to compete in their respective Street Prepared classes, with the additional allowance that they may use any tire which meets the requirements of 15.3 and fits on the Street Touring® compliant wheels and within the Street Touring® compliant bodywork.
In addition, the following modifications are allowed:
• Some updating/backdating with parts from different model years, see rule book for details.
• Modification of fenders for tire clearance. Adding of fender flares.
Weight reduction/transfer
• Air conditioning systems may be removed in whole or in part. This rule should not be interpreted to allow modification of the heater system.
• The driver and front passenger seats may be replaced with the following restrictions: Seats must be securely mounted per Section 3.3.3.B.2. Any replacement seat must be a full back, bucket-type automobile seat incorporating a functional headrest. Kart seats, low-back dune buggy seats, and other similar types of seat are expressly prohibited. Cars may have no fewer than the standard number of seats. The seat tracks are considered part of the seat and may be substituted. The standard seat belts may be removed to facilitate the installation of alternate restraints complying with safety requirements. An alternate seat which replaces an airbag-equipped seat is not required to have an airbag.
• Any steering wheel may be used. An alternate wheel which replaces an airbag-equipped wheel is not required to have an airbag. An alternate wheel is not required to have a horn button.
• Airbags may be electrically disabled but not removed unless explicitly allowed
• Both spoilers
• Removal of stereo
• Any DOT approved tires (see rules for restrictions), including R-compounds, of any size
• Brake cylinder
• Fuel injectors and pump
• Intercooler
• Intake water injection
• Turbo-back exhaust (no cats required)
• Clutch (metal)
• Flywheel (metal)
• Transmission mounts (non-metallic)
• Differentials
• Standalone engine management for non-turbo car.
• Boost controls may be used, but hardware must be stock
• Port matching (see rule book)
Street Modified (SM) Rules
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 Street, Street Touring or Street Prepared:
• Certain replaced body parts: e. g. carbon fiber hood, fenders
• 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
• Standalone engine management
• Internal engine modifications
• Engine transplant with different Mitsubishi 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 Street, 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; including CF trunk
• Weight reduction not explicitly allowed in SM: e. g. gutted interior, removed heater, wipers, lights
• Tires that are not DOT approved (racing slicks)
• 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)
OK, so once you’ve done your research, and still don’t know the answer to a question, ask it here. I may have left things out, and there probably are errors, so please let me know if you see anything and I will change it.
Again, if a modification is not explicitly authorized by the rules, IT IS NOT ALLOWED, no matter how trivial it seems.
Additional Resources
DRAFT 2016 Rule Book
FasTrack (official SCCA publication containing latest rule changes)
Solo information on SCCA web site
SCCA Forums (message boards)
Quick Categories Reference List:
Stock Evo X: B Street
Lightly modded: STU
Engine modifications: ASP or SM
*Disclaimer* This is not a guarantee for each car.
This is a summary of important SCCA Autox (Solo) rules, listing which popular mods are allowed in each category. It should answer the most common questions, but it does not replace the Official rule book, which contains the full details for all the points mentioned here, plus many more rules.
Categories
With increasing levels of modifications, a logical progression is from Street category (cars with no or minimal modifications) to Street Touring, Street Prepared, then Street Modified. There are categories beyond Street Modified (Prepared, Modified) that are not within the scope of this document.
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.
B Street Rules
• Tires: Must be UTQG treadwear 200 minimum rating
•Wheels: Any type wheel may be used provided it complies with the following:
A. It is the same width as standard and as installed it does not have an offset more than ±¼” (±6.35mm) from a standard wheel for the car. The resultant change in track dimensions is allowed.
B. Wheel (rim) diameter may be increased or decreased 1” from the standard part.
• Appearance, comfort and convenience options
• Removal of spare tire, tools and jack.
• Harness (seat belts cannot be removed), must be DOT approved.
• Lug nuts.
• Brake pads, speed bleeders.
• Shock absorbers, struts and strut housings that maintain stock ride height, can be adjustable. See 13.5 in the rule book for details!
• Front or rear sway bar, but not both.
• Different alignment using factory adjustments (no camber bolts).
• Spark plugs.
• Air filter element can be removed or replaced.
• Cat-back exhaust.
STU Rules
All Solo® Rules Street Category allowances, plus all allowances contained in Section 14. In addition, the following modifications are allowed:
• Wheels of any width (tire width limited to 265 for AWD vehicles and with a treadwear rating of 200 or higher).
Interior
• Pedal covers.
•The driver and front passenger seats may be replaced with the following restrictions. The seating surface must be fully upholstered. The top of the seat, or an attached headrest, may not be below the center of the driver’s head. The seat, including mounting hardware, must weigh at least 25 pounds and must be attached using the OE body mounting holes/studs. Additional mounting points may be added.
•Any steering wheel may be used. An alternate steering wheel assembly, including all mounting hardware, which replaces an airbag-equipped wheel is not required to have an airbag but must weigh at least as much as the standard assembly. An alternate wheel is not required to have a horn button.
Exterior
• Debadging
• Rolling of inside fender lip.
• Addition of spoilers, splitters, rear wings, bumper covers, valances, side skirts, and non-functional scoops/vents is allowed provided that either:
1. It is a production part which is standard or optional equipment of a US model of the vehicle. (“Model” is defined in Section 12.3.)
2. It is listed in the vehicle manufacturer’s US accessory catalog for that vehicle for normal highway use. This does not allow for parts sold through a manufacturer’s performance catalog.
Brakes
• Cross drilled and/or slotted brake rotors (standard size).
• Brake lines may be substituted with alternate DOT-approved flexible brake lines.
• Air ducts for brakes.
• Disabled ABS (not removed).
• Brake rotors (diameter equal or larger than factory, ferrous material).
• Brake calipers (original attachment point).
• Brake dust shield modifications to accommodate alternate rotors and calipers.
Suspension
• Shocks (fewer restrictions than stock).
• Springs including coilovers.
• Any suspension bushings, non-metallic.
• Any differential or mount bushings, non-metallic.
• Any subframe mount bushings, non-metallic.
• Adjustable camber plates (caster adjustment allowed).
• Camber bolts.
• Adjustable front control arms and rear lateral links (only if no front camber plates or camber bolts are used). Must have non-metallic bushings, spherical bearings are not allowed.
• Strut bars (not triangulated).
• Limited Slip Differentials
STU – Only standard (as defined in Section 12.4) limited slip differentials (LSD) are allowed on AWD vehicles. For AWD vehicles that did not come with any type of limited slip differential (including center differential or transfer case), a single aftermarket mechanical LSD may be added.
Power
• Uppipe (can be catless).
• Air Intake.
• Headers.
• Short-throw shifter.
• Crankshaft and accessory pulleys.
• Engine mounts (non-metallic).
• Any high flow catalytic converter(s) are allowed, and multiple catalytic converters may be replaced by a single unit. The inlet of the single replacement converter may be located no further downstream than 6" along the piping flow path from the original exit of the final OE converter.
• ECU reprogramming. Map must have unaltered factory boost maps.
• No changes to boost control are permitted.
ASP Rules
Cars listed as eligible in and prepared to the current Street Touring® category rules are permitted to compete in their respective Street Prepared classes, with the additional allowance that they may use any tire which meets the requirements of 15.3 and fits on the Street Touring® compliant wheels and within the Street Touring® compliant bodywork.
In addition, the following modifications are allowed:
• Some updating/backdating with parts from different model years, see rule book for details.
• Modification of fenders for tire clearance. Adding of fender flares.
Weight reduction/transfer
• Air conditioning systems may be removed in whole or in part. This rule should not be interpreted to allow modification of the heater system.
• The driver and front passenger seats may be replaced with the following restrictions: Seats must be securely mounted per Section 3.3.3.B.2. Any replacement seat must be a full back, bucket-type automobile seat incorporating a functional headrest. Kart seats, low-back dune buggy seats, and other similar types of seat are expressly prohibited. Cars may have no fewer than the standard number of seats. The seat tracks are considered part of the seat and may be substituted. The standard seat belts may be removed to facilitate the installation of alternate restraints complying with safety requirements. An alternate seat which replaces an airbag-equipped seat is not required to have an airbag.
• Any steering wheel may be used. An alternate wheel which replaces an airbag-equipped wheel is not required to have an airbag. An alternate wheel is not required to have a horn button.
• Airbags may be electrically disabled but not removed unless explicitly allowed
• Both spoilers
• Removal of stereo
• Any DOT approved tires (see rules for restrictions), including R-compounds, of any size
• Brake cylinder
• Fuel injectors and pump
• Intercooler
• Intake water injection
• Turbo-back exhaust (no cats required)
• Clutch (metal)
• Flywheel (metal)
• Transmission mounts (non-metallic)
• Differentials
• Standalone engine management for non-turbo car.
• Boost controls may be used, but hardware must be stock
• Port matching (see rule book)
Street Modified (SM) Rules
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 Street, Street Touring or Street Prepared:
• Certain replaced body parts: e. g. carbon fiber hood, fenders
• 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
• Standalone engine management
• Internal engine modifications
• Engine transplant with different Mitsubishi 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 Street, 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; including CF trunk
• Weight reduction not explicitly allowed in SM: e. g. gutted interior, removed heater, wipers, lights
• Tires that are not DOT approved (racing slicks)
• 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)
OK, so once you’ve done your research, and still don’t know the answer to a question, ask it here. I may have left things out, and there probably are errors, so please let me know if you see anything and I will change it.
Again, if a modification is not explicitly authorized by the rules, IT IS NOT ALLOWED, no matter how trivial it seems.
Additional Resources
DRAFT 2016 Rule Book
FasTrack (official SCCA publication containing latest rule changes)
Solo information on SCCA web site
SCCA Forums (message boards)
