tuner category full rules

TUNER CATEGORY

These are the vehicle preparation rules for the Tuner Category of SCCA National Time Trials Competition. As with Sport Category, they are broken down into an Overview and then the "Authorized Modifications" (i.e., what you can do to your car and have it stay in Tuner Category).

1. Overview

1. Philosophy

The Tuner Category is meant for street-driven cars with bolt-on modifications that offer a degree of adjustability. Vehicle modifications are meant to fit between the current Sport and Max Categories, providing a natural competition outlet for auto enthusiasts using sports cars and sedans equipped with common suspension and engine modifications compatible with street use.

Modifications must still be bolt-on modifications; in most cases bolting to the OE locations, but different from Sport Category these parts may be more "tunable." Items like adjustable ride-height coilovers, more complex sway bars and, for some cars, ECU hardware changes are allowed. Suspension geometry-altering items like bump-steer correction or roll-center correction kits will not be allowed. As this is a street car, aftermarket aero items such as wings, splitters, spoilers and diffusers will not be allowed.

Tuner Category is a restricted ruleset. If a modification is not specifically authorized in these Rules, it is not allowed. (If it doesn’t say you can, you can’t.)

2. Safety

1. Vehicles running in Sport, Tuner and Max Categories must meet Safety Level 1 Standards.

A. Roll bars, cages, racing harnesses and other safety equipment may be added, and must meet manufacturers' guidelines for installation. It is highly recommended that they at least meet the minimum for Safety Level 2 or Safety Level 3 Standards.

B. Nothing in the rules prevents you from adding safety equipment; the minimum amount of modification to install safety equipment is allowed.

C. To facilitate safety, vehicles that have an added roll bar (4-points) may remove carpet, seats and trim (including convertible tops) behind the front seats. Vehicles that have an added roll cage (6-points) may remove carpet, seats and trim (including convertible tops) other than the dash.

2. Fuel cells may be used in cars with the following restrictions and allowances:

A. Any replacement fuel cell should be constructed and installed to racing standards. (E.g., FIA/SFI approval, fuel cell enclosure, bladder, and foam baffling.)  

B. OE lines may be replaced in conjunction with a fuel cell provided they are shielded.

C. Any fuel lines—including gauge and vent lines—that pass into or through the driver/passenger compartment, shall be of steel tube or metal braided hoses or bulkheaded.

D. Drivers of cars with modified or replaced OE fuel lines or tanks must wear a suit, shoes, gloves and underwear as specified in SCCA Time Trials Safety Level 2 Standards.

E. Vehicles with modified or replaced OE fuel lines or tanks must have an on-board fire suppression (fire bottle or system) meeting SCCA Time Trials Safety Level 2 Standards.

F. Participants are cautioned that this is not an allowance to maximize fuel delivery by installing higher-performance parts than authorized by category rules. (E.g., installing an upgraded fuel pump if it's not otherwise allowed.)

3. Vehicle Eligibility

1. To be eligible for Sport Category:

A. A minimum of 1,000 of that model must have been produced that model year for road use.

B. The vehicle must be capable of being licensed for normal road use in North America and delivered through the manufacturer's North American retail sales outlets.

4. General Modification Rules

The following items are guidelines for general repair and modifications in Sport and Tuner Categories:

A. Other than when necessary for safety enhancements, an authorized addition, modification, substitution or removal may not perform a prohibited function nor does it permit the addition, modification, substitution or removal of any other component unless it is specifically authorized.

B. Any part which becomes partially or completely detached during on-track sessions must be fixed and inspected by officials before that vehicle can return to the track. If the part is an aerodynamic addition, the part shall be completely removed for the remainder of the competition.

C. Parts (other than brakes and fluids) are not permitted to be replaced or changed after the car has passed tech inspection unless an Event Official has determined the part to be unsafe or broken badly enough that not changing it would keep the participant from the event.

D. Expendable replacement parts (e.g., bearings, seals, gaskets, filters, belts, bolts, bulbs, batteries, clutch discs, pressure plates, suspension bushings, drivetrain mounts, fenders, trim pieces, fuel filler caps, electrical sensors, etc.) may be used provided they are essentially identical to the standard parts (e.g., have the same type, size, hardness, weight, material, specifications, etc.), are used in the same location, and provide no performance benefit. These allowances are strictly to allow components to be replaced from alternate sources other than the original manufacturer. They should not be construed as an allowance to replace components with those which could be considered a “higher performance” alternative.

E. Any repairs must comply with factory-authorized methods and procedures, or industry standard methods, as follows: If the OE does not provide an appropriate method of repair, industry standard methods and procedures may be used. Such repairs may not result in a part or combination of parts that provides a competitive advantage (e.g., significant change to weight, suspension control, power, etc.) as compared to the standard part(s). Competitors are strongly cautioned to use this allowance to make common-sense repairs only. It is not permitted to use non-compliant parts even if they have been set to OE specifications.

F. Items which do not require the modification or replacement of existing parts and do not increase the peak performance of the vehicle are permitted. (E.g., a turbo or alternator blanket.)

G. Except for authorized modifications, other modifications or equipment will place the car in higher levels as appropriate. Configurations involving damaged parts (e.g., blown fuses) are not typically authorized by the manufacturer and hence are not allowed.

H. Vehicles may be street-driven cars, and SCCA does not encourage or condone the breaking of laws governing pollution control systems or the alteration of street-driven vehicles contrary to state and Federal laws regarding their use. It continues to be the responsibility of the individual to comply with such state and federal laws.

2. Interior and Bodywork

1. Interior

1. A hole may be added through the bodywork to route a remote reservoir for shocks/struts and hose to a remote mounting location. Such holes may serve no other purpose.

2. 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. An alternate wheel is not required to have a horn button.

3. Any shift linkage may be used.

2. Bodywork

1. Front hoods, engine covers, trunk lids and hatches not containing glass, front fenders, rear fenders not part of chassis structure (unibody), front and rear bodywork, and side skirts may be replaced with factory parts or exact duplicates in order to facilitate allowed modifications.

2. Vehicles with removable hardtops may use an exact replica hard top including one made of of alternate materials. Replacement pieces must be able to use OE hinges and latching mechanisms as standard.

3. Factory rub strips may be removed.

4. OE “pop-up” headlights may be replaced with static headlights, provided the replacement units are intended for automobile use on public roads as a primary means of illumination, and retain high and low beams as originally provided by the manufacturer. Minor repositioning of the headlights can accommodate the alternate headlight, but the unit may not be relocated, and the repositioning may serve no other purpose. All associated hardware may be removed, replaced or modified.

5. Fenders may be rolled but not flared, but no material may be added or removed, pinch-welds may not be expanded, nor may the general shape and contour of the fender be modified.

6. Commercially available bodywork cladding, molding, trim, accessories, lights and other appearance modifications including flexible “chin lips,” which have little or no effect on performance and/or handling and do not materially reduce the weight of the car are permitted. The addition of small holes for attachment hardware for cosmetic modifications is implicit (e.g., holes for fasteners to mount side skirts).

This allowance seemingly grey for any SCCA traditionalists – is to encompass exactly what it says. Cosmetic items. This is intended to allow mass-produced aftermarket items which resemble what a factory accessory catalog or auto-parts store accessory isle might have. Meaning, this allowance is for items which may look like performance parts but do not change anything which could affect warranties by increasing stress/improving performance.

3. Wheels and Tires

1. Wheels

1. Any width or diameter wheel and wheel spacers may be used provided it complies with the following:

A. Non-metallic wheels must be certified/approved from an appropriate, recognized standards organization. (e.g., FIA, SFI, SAE, TUV, etc.)

B. Wheel spacers are permitted.

C. Wheel studs, lug nuts, valve stems (including pressure-relief types) and/or bolt length may be changed. Wheel bolts may be replaced with studs and nuts, but the number of fasteners may not be changed.

D. Tire pressure monitoring sensors may be removed.

E. Centerlock/spline drive/knock-off type hubs may be converted to lug-type hubs.

2. There are no wheel weight restrictions in Tuner Category.

2. Tires

1. Tires must meet the eligibility and use requirements of the Sport Category, but do not have to meet Sport Category width limits.

2. Tuner Tire Width Limits

Tires shall have a section width up to and including the following (mm):

CLASS

DRIVE

WIDTH LIMIT (In MM)

Tuner 1 (T1)

2-Wheel Drive

355

 

All-Wheel-Drive

335

Tuner 2 (T2)

2-Wheel Drive

315

 

All-Wheel Drive

305

Tuner 3 (T3)

2-Wheel Drive

285

 

All-Wheel Drive

265

Tuner 4 (T4)

2-Wheel Drive

265

 

All-Wheel Drive

245

Tuner 5 (T5)

2-Wheel Drive

245

 

All-Wheel Drive

225

3. Cars in Tuner Classes 2–5 and are otherwise legal for Tuner Category may bump up classes based on tire size. Cars in Tuner 1 with oversized tires will go into their appropriate Prepped or Max Category class.

4. Brakes

1. Brakes

1. Non-standard brake rotors may be used provided they are of equal or larger dimensions. Nominal reductions in rotor thickness or diameter in common big brake kits are permitted.

2. Aluminum rotor hats are allowed.

3. Cars originally equipped with solid (non-vented) rotors may utilize vented rotors.

4. Brake calipers and mounting brackets may be replaced provided they bolt to the standard locations and the number of or surface area of pistons is equal to or greater than standard. A functioning emergency brake of the same type, operation, and actuation as OE must be present. Drum brakes may be replaced with disc brakes of a diameter equal to or greater than the inside diameter of the standard drum. Such conversions must be bolted, not welded, to the axle/trailing arm/upright and must include an integral, redundant emergency brake. Changes to backing plates/dust shields/brake lines to accommodate these changes are permitted but may serve no other purpose.

5. Air ducts may be fitted to the brakes and changes may be made in the body/structure for their use. Ducts or holes may serve no other purpose. Backing plates and dirt shields may be modified or removed.

6. A single brake master cylinder brace may be added provided it is bolt-on and serves no other purpose.

5. Steering and Suspension

1. Steering

Steering rack bushings may be replaced but must attach in the factory location(s) without additional modification or changes. Steering rack position may not be changed. The amount of metal in a replacement bushing may not be increased relative to the amount of metal found in a standard bushing for the particular application. Solid metal bushings are specifically prohibited. This does not allow shimming or otherwise relocating the steering rack.

2. Shocks and Struts

1. Shocks and Strut Replacement Allowances:

A. Any shock absorbers may be used.

B. Shock absorber mounting brackets which serve no other purpose may be altered, added, or replaced, provided that the attachment points on the body/frame/subframe/chassis/suspension member are not altered. This installation may incorporate an alternate upper spring perch/seat and/or mounting block (bearing mount). The system of attachment may be changed.

C. The number of shock absorbers shall be the same as standard.

D. No shock absorber may be capable of adjustment while the car is in motion, unless fitted as original equipment.

E. MacPherson strut equipped cars may substitute struts and/or may use any insert. This does not allow unauthorized changes in suspension geometry or changes in attachment points (e.g., affecting the position of the lower ball joint or spindle). It is intended to allow the strut length changes needed to accommodate permitted modifications which affect ride height and suspension travel.

2. The following additional allowances apply to cars originally equipped with separate spring and shock absorber assemblies.

A. Coil springs may be relocated so they encircle the body of the shock absorber in a “coilover” configuration.

B. Coil spring perches may be modified, added, or replaced and their position may be adjustable.

C. Additional bolt holes may be drilled for coilover assembly mounting brackets. This does not permit any modifications to the frame or unibody beyond the allowed mounting holes.

3. Springs

Springs must be of the same type as the original (e.g., coil, leaf, torsion bar, bellows) and except as noted herein, must use the original spring attachment points. This permits multiple springs, if they use the original mount locations. Coil spring perches originally attached to struts or shock absorber bodies may be changed or altered and their position may be adjustable. Spacers are allowed above or below the spring. Coil springs may incorporate spring rubbers. Suspension bump stops may be altered or removed. For cars originally equipped with transverse leaf springs, spring type may be changed to a coil spring. Spring perches may be added to shock absorbers for mounting coil springs in a “coilover” configuration.

4. Anti-Sway (Roll) Bars

Substitution or removal of sway bars (at one or both ends of the car) and supporting hardware (brackets, end links, bushings, etc.) is permitted. Tow hooks may be removed for the instillation of sway bars.

5. Strut Braces

Strut bars are permitted with all types of suspension, subject to the following constraints:

1. A 2-point strut bar may be added, removed, modified, or substituted, but only with another 2-point strut bar.

2. A triangulated (3-point) strut bar may be removed, modified, or substituted; substitution may be with either a triangulated or a 2-point strut bar. The connection to the chassis (e.g., firewall, bulkhead) must be in the standard location.

3. Lower suspension braces must be attached to the lower suspension pickup point locations on the chassis within 2 inches (50.8mm) in any direction of the actual suspension attachment to the chassis.

4. Except for standard parts, no connections to other components are permitted. Additional holes may be drilled for mounting bolts. Only “bolt-on” attachment is permitted. Interior trim panels may be modified to allow installation of strut bars. Holes or slots may be no larger than necessary and may serve no other purpose. This does not permit any modifications to the frame or unibody beyond the allowed mounting holes.

6. Suspension

1. Ride height may only be altered by suspension adjustments, the use of spacing blocks, leaf spring shackles, torsion bar levers, or change or modification of springs or coil spring perches. This does not allow the use of spacers that alter suspension geometry, such as those between the hub carrier and lower suspension arm.

2. Suspension bushings may be replaced with bushings of any materials (except metal) if they fit in the original location. Offset bushings may be used. The use of replacement bushings with an amount of metal greater than the amount found in the standard bushing for that particular application is limited to one link or arm per corner of the vehicle, with the same link or arm being chosen on both sides of an axle. On double/unequal arm (e.g., wishbone, multi-link) suspensions located on the steering axle of the vehicle, the use of replacement bushings with an amount of metal greater than the amount found in the standard bushing for that particular application is allowed only if there are no other replacement bushings on that axle that result in changes to alignment parameters, such as offset bushings. In a replacement bushing, the amount of metal in a replacement bushing may not be increased relative to the amount of metal found in a standard bushing for the particular application. Solid metal bushings are specifically prohibited unless there is a solid metal bushing as an OE part for the specific year/make/model. This does not authorize a change in type of bushing (e.g., ball and socket replacing a cylindrical bushing) or use of a bushing with an angled hole whose direction differs from that of the original bushing. If the standard bushing accommodated multi-axis motion via compliance of the component material(s), the replacement bushing may not be changed to accommodate such motion via a change in bushing type, for example to a spherical bearing or similar component involving internal moving parts. Pins or keys may be used to prevent the rotation of alternate bushings but may serve no other purpose than that of retaining the bushing in the desired position.

3. The following allowances apply to strut-type suspensions. Adjustable camber plates may be installed at the top of the strut and the original upper mounting holes may be slotted. The drilling of holes to perform the installation is permitted. The center clearance hole may not be modified. Any type of bearing or bushing may be used in the adjustable camber plate attachment to the strut. The installation may incorporate an alternate upper spring perch/seat and/or mounting block (bearing mount). Any ride height change resulting from installation of camber plates is allowed. Caster changes resulting from the use of camber plates are permitted.

4. Camber bolts may be installed providing these parts use the original, unmodified mounting points and meet the restrictions specified in Sport Category. Caster changes resulting from the use of camber bolts are permitted.

5. Camber kits (also known as camber compensators) may be installed. These kits consist of either adjustable length arms or arm mounts (including ball joints) that provide a lateral adjustment to the effective length of a control arm. Alignment outside the factory specifications is allowed. The following restrictions apply:

A. On double/unequal arm (e.g., wishbone, multi-link) suspensions, only the upper arms OR lower arms may be adjustable, but not both. Non-integral longitudinal arms that primarily control fore/aft wheel movement (e.g., trailing arm(s) or link(s) of a multi-link suspension) may not be replaced, changed, or modified.

B. On arm-and-strut (MacPherson/Chapman) suspensions, the lower arms may be adjustable OR other methods of camber adjustment as allowed by the previous sections may be used, but NOT both.

C. The non-adjusting control arms for vehicles having integral bushing/arm assemblies may be replaced subject to the following restrictions.

a. Arm length must remain the same as OE.

b. The part may not be adjustable.

c. The replacement arms must attach to the original standard mounting points. All bushings must meet the requirements of this section. Intermediate mounting points (e.g., shock/spring mounts) may not be moved or relocated on the arm. The knuckle/bearing housing/spindle assembly cannot be modified or replaced.

d. Any allowed arm must be commonly available (or have been available) at SCCA supporting partner Tire Rack, for regular retail sales and without custom order. Parts do not have to be sourced from Tire Rack, but they must be as they would have come off the shelf there, or the part must be on a specific approval list.

e. If you believe there is a commonly available retail unit which otherwise fits the intent of these Rules but is not available at Tire Rack you may write in for specific approval of that brand and model.

6. On swing or trailing arm suspensions, the main arms may not be modified or replaced, but lateral locating links/arms may be modified or replaced.

7. Front wheel drive (FWD) cars with rear beam axles may use shims between the rear axle and hubs.

8. The replacement arms or mounts must attach to the original standard mounting points. All bushings must meet the requirements of Tuner Category Rules. Intermediate mounting points (e.g., shock/spring mounts) may not be moved or relocated on the arm, except as incidental to the camber adjustment. The knuckle/bearing housing/spindle assembly cannot be modified or replaced.

9. Changes in suspension geometry are not allowed except as incidental to the effective arm length change.

Note: Many modern suspension designs known by other names, actually function as double A–arm designs. These include the rear suspensions on 1988-on Honda Civic/Integra, Chrysler/Plymouth/Dodge Neon, BMW E36, and most “multi-link” and are covered by the double/unequal arm rule.

10. On strut-equipped cars, the strut’s lower integral mounting bracket, for attachment to the upright or spindle, is unrestricted provided it attaches to the standard location. Any resulting change to the position of the strut centerline is allowed. Such brackets shall serve no other purpose. This does not allow for changes to the integral steering arm on cars that have the steering arm integrated with the strut body.

11. Changes in alignment parameters that result directly from the use of the allowed components are permitted. For example, the dimensional changes resulting from the use of a cylindrical offset bushing that meets the restrictions of Tuner Category Rules are allowed, including those resulting from a change in the pivoting action to:

A. About the mounting bolt, or

B. About the bushing itself.

12. Subframe mount bushings may be replaced but must attach in the standard location(s) without additional modification or changes. Subframe position may not be changed. The amount of metal in a replacement bushing may not be increased relative to the amount of metal found in a standard bushing for the particular application. Solid metal bushings are specifically prohibited unless there is a solid metal bushing as an OE part for the specific year/make/model on a trim level classed in Tuner Category.

13. The following list is Solid Axle Rear Wheel Drive (RWD) Suspension Allowances:

A. Addition or replacement of suspension stabilizers (linkage connecting the axle housing or De Deion to the chassis, which controls lateral suspension location) is permitted.

B. Traction bars or torque arms may be added or replaced.

C. A Panhard rod may be added or replaced.

D. The upper arm(s) may be removed, replaced, or modified and the upper pickup points on the rear axle housing may be relocated.

E. The lower arms may be replaced or modified and the lower pickup points on the rear axle housing may be relocated.

F. Differential covers and attaching hardware may be replaced.

G. Methods of attachment and attachment points are unrestricted but may serve no other purpose (e.g., chassis stiffening). This does not authorize removal of a welded-on part of a subframe to accommodate the installation.

The following non-adjustable control arms not available at Tire Rack are allowed in SCCA Time Trials Tuner Category:

There are no models listed at this time.

7. Sub Frame Connectors

Longitudinal (fore-aft) subframe connectors (SFCs) are permitted with the following restrictions:

1. They must only connect previously unconnected boxed frame rails on unibody vehicles.

2. Each SFC must attach at no more than three (3) points on the unibody (e.g., front, rear, and one point in between such as a seat mount brace or rocker box brace).

3. SFCs must be bolted in place and not welded.

4. No cutting of OE subframes or floorpan stampings is permitted. Drilling is permitted for mounting bolts only.

5. No cross-car/lateral/triangulated connections directly between the driver’s side and passenger’s side SFCs are permitted. Connections to OE components such as tunnel braces or closure panels via bolts are allowed and count as the third point of attachment. No alteration to the OE components is permitted.

6. SFCs may not be used to attach other components (including but not limited to torque arm front mounts or driveshaft loops) and may serve no other purpose.

6. Electrical

1. Electrical

Except for those with electric and hybrid powertrains, Tuner Category vehicles may do everything allowed in Sport Category plus the list below.

1. OE traction control systems may be electrically disabled, but not removed or altered in any other way.

2. The make, model number and size of the battery may be changed, but not its voltage.

3. Relocation of the battery or batteries is permitted but not into the passenger compartment. If the battery is relocated and the original battery tray can be removed by simply unbolting it, the tray may be removed or relocated with the battery. Holes may be drilled for mounting or passage of cables. Longer or shorter cables may be substituted to permit relocation.

4. The number of battery or batteries may not be changed from standard. The area behind the rearmost seat is not considered to be within the passenger compartment. The area under the rearmost seat is within the passenger compartment.

5. Holes may be drilled in the firewall to permit passage of electrical wiring. It should be no larger than necessary to facilitate allowed modifications in this section and shall serve no other purpose.

6. Any starter, generator or alternator may be used in the original position. An alternator or generator must have an electrical output (including amperage) equal to or greater than the original equipment unit. Any generator or alternator pulley and belt of the same type as standard may be used.

7. Electrically driven fans are allowed. Flex fans are not allowed.

7. Engine and Drivetrain

1. Engine Control/ECU/Electronics

In addition to the Sport Category allowed modifications, the following modifications may be made to Tuner Category ECU/engine controls:

1. For all model years, the following allowances apply:

A. The standard PCM/ECU may be re-programmed without restriction.

B. Fuel pressure regulator(s) may be replaced in lieu of electronic hardware or software alterations. It is not permitted to mechanically alter the fuel pressure regulation AND make other hardware or software changes to engine operation.

C. Ignition timing may be set at any point on factory-adjustable distributor ignition systems.

D. Alternate computer control modules may be used whenever an equivalent change to the conventional system is allowed. For example, alternate computer module control of ignition settings or fuel injection is allowed.

2. 1995 and older vehicles, in addition, may replace the standard PCM/ECU without restriction.
3. Boost may be controlled through a mechanical boost controller.

2. Intake

In addition to the Sport Category allowed modifications, the following modifications may be made to Tuner Category vehicle intakes:

1. Intercoolers
As utilized only on engines originally equipped with forced induction, induction charge heat exchangers (also known as “intercoolers” or “charge air coolers” [CACs]) are unrestricted in size and configuration and are subject to the following restrictions: 

1. Air-to-air CACs and radiators for air-to-liquid CACs must be cooled only by the atmosphere except for standard parts.

2. Body panels, fascias, or structural members may not be cut or altered to facilitate CAC installation.

2. Charge Pipes
Charge pipes may be modified or replaced. Replacement charge pipes may delete or block off factory pipes designed to enhance intake sounds (“noisemakers”). Modification or deletion of vehicle components (e.g. plastic shrouds, wheel well liners) to permit routing of alternate charge pipes is not allowed.

3. Compressor Bypass Valves
Compressor Bypass Valves (CBVs), blow-off valves, and pop-off valves may be replaced or modified.

3. Cooling System

1. Engine cooling radiators may be replaced or added with alternate parts subject to the following restrictions:

A. Radiator core dimensions (width, height, thickness) cannot be smaller than the standard part.

B. Radiator must mount to OE radiator mounts.

C. Fluid capacity and dry weight of the radiator must be no less than that of the standard part. Installation of an alternate radiator may serve no other purpose (e.g., to allow a cold air intake passage).

D. The installation of water expansion tanks is allowed. A water expansion tank is the container which catches overflow coolant.

E. Thermostats may be added or substituted. A thermostat is a device which controls the passage of water.

F. Modifications necessary for additional radiators must be the minimum required for installation.

4. Engine Rebuilds/Service Limits

1. Engine Service Limits

A. Engines may be rebored to the manufacturer’s first standard overbore, not to exceed 0.020 inch (0.508 mm). Sleeving is allowed to repair to the standard bore. Only OE-type standard or first overbore pistons of the same configuration and of the same or greater weights are permitted. No interchange between cast and forged pistons is allowed.

B. Valve seats and guides in older engines originally designed for leaded fuel may be only substituted with alternate components if the dimensions are the same as those of the standard components.

5. Transmissions/Differentials/Transfer Cases

1. Limited Slip Differentials (LSD): Any mechanical LSD unit is permitted. Final drive ring and pinion gears may be replaced with alternate parts, provided the final drive does not change.

2. Any mechanical shift linkage may be used.

3. Any clutch disc and pressure plate of stock diameter and design may be used, provided that they can be bolted directly to an unmodified stock flywheel.

4. Alternate flywheels are permitted. Flywheel material shall be the same type as OE and the ring gear diameter must be the same as the OE flywheel.

5. Any transmission mount is allowed provided it attaches only to the original mounting points, does not relocate the transmission (other than incidental to changes in compliance material), and weighs no less than the OE mount. The amount of metal in a replacement bushing may not be increased relative to the amount of metal found in a standard bushing for the particular application. Solid metal bushings are specifically prohibited. All components between the transmission and the mounting structure are considered to be part of the mount assembly.

6. Differential mount bushings may be replaced but must attach in the standard location(s) without additional modification or changes. Differential position may not be changed. The amount of metal in a replacement bushing may not be increased relative to the amount of metal found in a standard bushing for the particular application. Solid metal bushings are specifically prohibited.

7. Electronic Transmission/Differential Control

1. The Transmission Control Unit (TCU) may be re-programmed. This allowance only applies to modification of transmission behaviors and does not extend to re-programming any other components.

2. Electronic differentials may be re-programmed. This allowance only applies to changing differential behaviors and does not extend to re-programming any other components.

6. Exhaust

1. Exhaust manifolds, headers, downpipes, and associated EGR tubes may be replaced with alternate units. Exhaust exit may be relocated provided it meets safety requirements. Relocation of the oxygen sensor on the header is permitted. Exhaust heat shields which cover only, and attach solely to, these parts may also be replaced, removed, or modified. All other exhaust heat shields may be modified the minimum amount necessary to accommodate allowed alternate exhaust components. Mounting brackets/hardware which serve no other purpose are considered part of the exhaust components.

2. Catalytic converters – Any catalytic converters are allowed, provided they meet the following restrictions.

A. Catalytic converters must attach within 18” (457.2 mm) of the original unit.

B. Multiple catalytic converters may be replaced by a single unit.

C. The inlet of the single replacement converter may be located no further downstream than 18” (457.2 mm) along the piping flow path from the original exit of the final OE converter.

D. The extents of an OE converter are defined by the expansion chamber in which the catalyst is contained, regardless of placement within larger exhaust sections.

E. Replacement converters must have a minimum catalyst density of 100 cells per inch and minimum substrate length of 3” (76.2 mm).

Note: The SCCA does not encourage or condone the breaking of laws governing pollution control systems or the alteration of street-driven vehicles contrary to state and Federal laws regarding their use. It continues to be the responsibility of the individual to comply with such state and federal laws.

7. Oil/Lubrication

1. Oil pans, oil-pan baffles, windage trays, oil pickups and differential covers may be modified or substituted with the following restrictions:

A. Addition or modification of crankshaft scrapers is not allowed.

2. Engine oil, transmission fluid, differential fluid and power steering fluid coolers may be added or substituted (including oil to coolant heat exchangers), but may not serve any additional purpose.

3. Oil accumulators and associated hardware may be installed given it serves no other purpose. If any portion of the oiling system is inside the driver compartment, the vehicle and driver must meet safety level 2 standards at a minimum.

8. Engine Accessories

The following external engine components may be changed or replaced, with the listed restrictions:

1. Any accessory pulleys and belts of the same type (e.g., V-belt, serpentine) as standard may be used. This allowance applies to accessory pulleys only (e.g., alternator, water pump, power steering pump and crankshaft drive pulleys). It does not allow replacement, modification, or substitution of pulleys, cogs, gears or belts which are part of cam, layshaft, or ignition drive or timing systems, etc. Any crankshaft damper or pulley may be used. SFI-rated dampers are recommended. Supercharged cars may not change the effective diameter of any pulley which drives the supercharger.

2. Any engine mount is allowed provided it attaches only to the original mounting points, does not relocate the engine (other than incidental to changes in compliance material), and weighs no less than the OE mount. The amount of metal in a replacement bushing may not be increased relative to the amount of metal found in a standard bushing for the particular application. Solid metal bushings are specifically prohibited. All components between the engine and the mounting structure are considered to be part of the mount assembly.

8. Other

1. Out of Production Cars

Where a car is out of production and the manufacturer is either out of business, stocks no parts or no longer has a required part, a part of any origin but as similar as possible to the original may be substituted.

1. The entrant must be prepared to show documentary evidence that one of the three circumstances above applies and that the substituted part is as similar as possible under the circumstances.

2. Substitute parts which provide improvements in performance (e.g., superior gearing, lighter weight, better camshaft profile, etc.) are not permitted under this allowance.

9. Fuel

1. Allowed Fuel

1. Sport and Tuner Category vehicles will use fuel which is “Federally approved for use on public highways.” This does not allow racing-type fuels which are available at service station pumps.

2. Fuels comprised of more than 15% ethanol may only be used when specified by the manufacturer for regular road use (e.g., in the owner’s manual for flex-fuel vehicles, not including emergency situations).

3. Propane or Compressed Natural Gas (CNG) fuel may be used in any category provided that the following conditions are met:

A. The tank must be located in a safe location on the car and be firmly and securely mounted. This does not permit the cutting of vehicle sheet metal (e.g., the trunk floor) for tank installation.

B. The tank must conform to Federal and local container standards and have an emergency relief/cut-off control.

C. For use of propane or CNG as a fuel, no changes to the induction system of the engine may be made with the exception of the necessary fuel lines to the carburetor or fuel injection. There may also be no other engine parts changed.

D. The entire system must meet local ordinances covering the use and transmission of compressed gas.

E. Propane or CNG may not be used in combination with another fuel.

10. Classing

1. Tuner Category Exclusion List

Even more awesome cars we considered, and ultimately decided, "This is certainly a dream car, and Max Category is the place for dream cars, whether it's the car you dream to build, or the car you dream to buy." And as awesome as all of the cars on this list are, they are automatically placed in Max 1!

Acura
  NSX 2016+
 
BMW
  M3 GTS 2010
  M3 LTW 1995
  M4 GTS 2016
 
Chevrolet
Corvette Z06, ZR1 2015+
Corvette ZR1, 2006-2014

Corvette Z51, 2020+

Dodge
Viper GTS-R or ACR
Hellcat Redeye Widebody 2019
Challenger SRT Super Stock 2021+
Charger Hellcat Widebody
Ford
GT500 2020+
Honda
S2000 CR
Lamborghini
Gallardo All 2004-2013
Mercedes Benz
AMG GT GTS 2015-2023
McLaren
720 S
MP4-12C
Porsche
  911 GTS 2017-2019
  GT4 RS
  GT3 RS 2015+
  GT3 2006+
  911 Turbo, Turbo S 2013-2015

2. Tuner Category - Alternate Motorsports Series Classing

This is where we're going to put cars that might not quite meet the rules, but we think they can go in this category anyway. Only one Alternate Motorsport Allowance can be used at a time! Your car must be built specifically for one of the series mentioned below vs running another Alternate Motorsport Series allowance to compete there. Example: Spec e46 cannot use the SCCA Road Racing T3 allowance to then run in Tuner.

1. Cars listed as eligible in and prepared to the SCCA Road Race National Touring 2, 3 and 4 Rules are permitted to compete in their respective Time Trials Tuner Class provided they run on Time Trials legal tires. Vehicles with this allowance are not permitted to interchange preparation rules otherwise.

2. Cars listed as eligible in and prepared to the SCCA Road Race National Spec Miata Rules are permitted to compete in Time Trials Tuner Class 5 (T5) provided they run on Time Trials legal tires. Vehicles with this allowance are not permitted to interchange preparation rules otherwise.

3. Cars listed as eligible in and prepared to the SCCA Solo Street Touring Rules are permitted to compete in their respective Time Trials Tuner Class. Vehicles with this allowance are not permitted to interchange preparation rules otherwise.

Note: SCCA Solo Street Prepared has been rejected for Tuner Category inclusion because a full-tilt Street Prepared car is an engine-swapped, intake-manifold customized Frankenstein creation which is awesome, but doesn't belong in Tuner Category.

3. Tuner 1 (T1)

Model Trim Years
Alfa Romeo
Guilia Quadrifoglio 2016-2022
Audi
R8 V10, standard All
RS5 Sportback 2019+
RS6 2021+
BMW
M2 All 2023+
M3 2020+
M4 2021+
M3 Competition (xDrive included) 2021+
M4 Competition (xDrive included) 2022+
M5 Competition  2023
M6 F06/F12/F13 2012-2018
Cadillac
ATS-V 2016-2019
CTS-V 2009-2015
CT4 V Blackwing 2022+
CT5 V Blackwing 2022+
Chevrolet
Camaro ZL1 All 2018-2023
Corvette Naturally Aspirated 2014-2019
Corvette non-Z06 2020-2022
Corvette Z06 2006-2013
Dodge
Viper 2003-2006
Ferrari
550 Maranello 1996-2001
Ford
Mustang Shelby GT500 2010-2015
Mustang Shelby GT350R All
Lotus
Emira Supercharged V6 2022+
Evora GT 2020-2021
Exige  S 2006-2008
Exige S240 2008-2011
Mercedes
C63/C63S Twin Turbo 2015-2021
Nissan
GT-R Base & Nismo 2009+
Porsche
718 Spyder (Non-RS) 2019-2023
911 Carrera Base 2020+
911 Carrera T 2017-2023
911 Carrera S Chronosport 2011-2019
911 Carrera GTS 2014-2021
911 GT3 1999-2005
Boxster Spyder 2016-2019
Cayman S, GTS 2017-2022
Cayman GT4 3.8L 2016-2019
Cayman GT4 4.0 L 2020-2022
Panamera Turbo 2016-2023
Tesla
S Non-Plaid 2012+

4. Tuner 2 (T2)

Model Trim Years
Acura
Integra Type S 2024
NSX 1990-2005
TLX Type S 2023+
Alfa Romeo
4C 2014-2020
Audi
RS3 2017-2020
RS5 2012-2015
R8 V8 4.2 2006-2015
S4 2016-2019
TT RS 2012-2021
BMW
135i 2008-2013
M235i 2014-2016
M240i 2016-2021
340i M Sport 2016-2018
i4 eDrive40 2021-2024
M440i xDrive 2021-2022
1M 2011-2012
M2 Base 2016-2021
M2 Competition 2019-2021
M3 2007-2019
M4 2015-2021
M3 Competition 2011-2012
M4 Competition 2017-2020
M6 2005-2010
X3 M Competition 2016-2020
Cadillac
CT4 V 2022+
CTS  VSPORT (TT V6) 2014-2019
Chevrolet
Camaro LT1 2020+
Camaro SS    2010+
Camaro SS 1LE 2017-2022
Camaro Z28 2014-2015
Corvette All-Not Otherwise Classed or Excluded 1984-2013
Corvette Non-Z06 2005-2013
Corvette Z06 2001-2004
Corvette  ZR1 1990-1995
Chrysler
Crossfire SRT6 2004-2008
Dodge
Challenger Scat Pack 2014+
Challenger SRT8 2008+
Charger Scat Pack, Widebody 2020-2023
Stealth R/T Turbo All
Viper 1991-2002
Ford
Mustang Dark Horse (All) 2024
Mustang  GT, GT Perf Pkg 2015-2023
Mustang Mach 1 2021-2023
Mustang GT350 2016-2020
Mustang  Boss 302 2012-2013
Genesis
G70 Design Edition 3.3T 2019-2022
Honda
Civic Type R 2023+
Hyundai
Ioniq 5 N 2025
Infinity
Q50 Red Sport 400  2016-2022
Jaguar
F-Type 400 Sport 2018
XKR 2010-2015
Lexus
GS-F 2016+
IS-F 2008-2014
RC-F (Non-Fuji Edition) 2015+
Lotus
Elise 2005-2011
Evora Non-Supercharged 2010-2014
Exige S 2006-2008
Maserati
Gran Turismo Base 2007-2019
Gran Turismo Sport 2012-2019
Gran Turismo MC Sportline 2009-2019
Mercedes
C63 AMG 507 (Non SC) 2008-2015
CL63 AMG (V8) 2007-2014
CLA45 AMG 2020-2023
GLA45 AMG 2015-2019
Nissan
Z Base + Nismo 2023+
Porsche
Boxster  S 2013-2016
Cayman Base 2.0 2017-2024
Cayman  S 2013-2016
Cayman R 2011-2012
Cayman GTS 2014-2016
911 Turbo 1997-2004
911 Carrera S  2006-2012
911 Carrera 4S 2006-2012
911 Carrera 2012-2015
911 Carrera S non-Power Kit 2012-2014
911 Carrera 4S non-Power Kit 2012-2014
Tesla
Model 3 Long range RWD 2017-2019
Model 3 SR+ 2019-2020
Model 3 Performance 2018-2022
Toyota
Supra Turbo 1993-1998
Supra GR (3.0) 2020+
Supra 2.0 2021+
VW
Golf R 2022+

5. Tuner 3 (T3)

Model Trim Years
Acura
Integra Type R 1997-2001
Integra Type S 2023+
RDX All 2019+
TLX 4cy Technology 2015-2020
Alfa Romeo
Giulia Ti 2016+
Audi
A3 2.0T All 2015-2018
S3 2013-2020
S3 Quattro Wagon 2006-2013
S4 2009-2016
S5 3.0T FSI 2008-2017
TT S 2009-2018
BMW
228i 2013+
230i All 2017+
330i  xDrive Sport Wagon 2017-2019
335D 2006-2011
335i All 2006-2015
430i xDrive 2014-2020
440i xDrive 2014-2020
535i RWD 2004-2010
540i 1996-2003
650i Base 2005-2010
M3 1986-1991
M3 2001-2006
M5 1998-2003
Z3 1996-2002
Z4  3.0i 2003-2008
Z4 M 2006-2008
Z4 35i M 2009-2016
Z4 35is M 2009-2016
Buick
Regal GS 2012-2017
Cadillac
ATS 3.6L V6 2013-2015
CTS V 2004-2007
Chevrolet
Camaro 4cyl Turbo 2016+
Camaro IROC Z 1988-1992
Camaro SS 1998-2002
Camaro V6 2010+
Camaro  Z28 (All) 1993-1997
Cobalt SS (FI) 2005-2010
Corvette Z07 1984-1991
Corvette Base 1968-1997
Corvette Non-Z06 1997-2004
SS 2014-2017
Chrysler
Crossfire SRT6 2004-2008
Dodge
Charger R/T 2001+
Neon SRT-4 All
Ford
Focus RS 2016-2018
Mustang Cobra 1994-1996
Mustang Cobra SVT 1996-1998
Mustang Ecoboost 2015-2023
Mustang GT 1964-1968
Mustang V6 2011-2015
Mustang V8 1978-2014
Taurus SHO 2010-2018
Honda
Civic  Type R 2016-2022
Hyundai
Elantra N 2022
Genesis 2.0T & 3.8 (incl. Track) All
Sonata SE Turbo 2011-2013
Veloster N 2019-2022
Veloster Turbo RSpec 2014-2017
Infiniti
G35 2002-2007
G37 2002-2015
Q50 3.0T 2016+
Kia
K5
GT
2021-2023
Stinger GT 2018-2023
Stinger
GT2
2018-2023
Lexus
GS300 V8 1997-2005
GS350
FSport 2016-2020
IS300 2014-2020
IS300 FSport 2014-2020
RC200T FSport 2015+
Lotus
Evora Base - NA 2010-2014
Mazda
MazdaSpeed6 All
RX-7 1992-1995
Mercedes
C450 AMG 4MATIC 2015-2016
C55 AMG 2004-2007
CLK55 AMG 2003-2006
SL550 All 2007-2013
SLK250 All 2011-2019
SLK55 AMG 2005-2011
Mini
Cooper S JCW All
Mitsubishi
Lancer Evolution All
Nissan
350/370 Z Naturally Aspirated All
300ZX Twin Turbo 1990-1996
Polestar
2 Dual Motor, Performance Pack 2020-2024
Pontiac
Firebird  Firehawk/Formula/TransAm 1993-2002
GTO 2004-2006
Solstice GXP 2007-2009
Porsche
Boxster Base 2005-2016
Boxster S 1999-2012
Cayman Base 2005-2016
Cayman S 2005-2012
Macan S 2014+
911 Carrera 2, 4 1999-2008
944 Turbo All
Saturn
Sky Redline All
Subaru
BRZ Base/Premium/tS 2022+
Legacy GT 2003-2009
WRX All All
Toyota
Camry TRD 2018+
Camry XLE/XSE V6 2018+
Corolla
GR 2023+
GR86   2022+
MR2 Turbo 1989-1995
Volkswagen
Golf R 2015-2021
Volvo
S60 R 2004-2007
V60 Polestar 2016

6. Tuner 4 (T4)

Model Trim Years
Acura
CL Type S 2000-2003
Integra 1986-2001
RSX All
TSX 2004-2014
Audi
A3 2006-2013
A4 1.8T 2001-2006
A4 2.0T 2004-2013
TT 1.8T Quattro 1998-2006
TT VR6 (All) 2003-2010
BMW
128i 2008-2013
3-series e36, 6cyl Non-LTW 1992-2000
3-series e46, non-M3 1999-2005
325i 2006-2013
328i 2007-2013
330i 2019-2024
528i 1995-2001
Z3 6cyl, Non-M All
Z4 2.5i  2003-2008
Cadillac
CTS V6 2004-2007
Chevrolet
Bolt  2017+
Camaro V6 1993-2002
Cobalt Naturally Aspirated 2005-2010
Cruz LT 2014+
Impala LT 6cyl 2014-2020
Volt 2016+
Chrysler
Conquest TSi 1987-1989
Crossfire Base 2004-2008
Dodge
Dart SXT (1.4T) All
Omni GLH & GLH-S 1984-1986
Fiat
500 Abarth 2008+
Ford
Crown Vic 1997-2007
Fiesta ST  All
Focus ST All
Focus ZX3 2004-2011
Fusion SE AWD 2.0T 2017-2020
Fusion Sport (3.5L) 2010-2012
Mustang SVO 1984-1986
Mustang V6 1999-2010
Taurus SHO 1989-1999
Thunderbird LX 1994-1997
Honda
Accord EX V6 2002-2007
Civic
Si
1995-2021
Civic  Sport Hatchback 2016-2021
S2000 Non-CR All
Hyundai
Elantra  Sport 2017-2020
Elantra GT Sport 2018-2020
Kona N 2022+
Veloster Turbo 2013-2017
Kia
Forte GT 2018-2023
Lexus
GS300 Non-V8  1997-2005
IS300 2000-2004
IS350 2006-2013
SC300 Base 1992-2000
Mazda
3 Touring & Sport 2013-2018
MazdaSpeed 3 All
MazdaSpeed Miata All
MazdaSpeed Protegé All
Miata/MX-5 2006+
RX-7 Turbo II All
RX-8 All
Mercedes
E350 Sport 2010-2016
SL500 Sport 1989-2001
MINI
Cooper S 2007+
Mitsubishi
Starion ESI-R 1987-1989
Nissan
300ZX Turbo 1983-1989
300ZX Non-Turbo 1990-1996
Sentra 2013+
Sentra Nismo 2017+
SE-R All (Incl. Spec-V) 2004-2006
Pontiac
Solstice 2006-2010
Porsche
Boxster 986, Non-S 1996-2004
911 Carrera 3.2 1984-1989
911 (964) C2, C4 1989-1994
944 1982-1991
944 S2 1989-1999
968 1992-1995
Saab
9-3 2.8T All
9-3 2.0T All
Saturn
Sky Non-Redline All
Scion
FR-S All
Subaru
BRZ Limited/Premium 2013-2021
Forester XT 2004-2008
SVX 1991-1996
Toyota
86
  2013-2021
Camry 4cyl 2018+
Celica GTS 1999-2006
Prius ALL 2022+
Volkswagen
Golf 2.5 2009-2012
Golf GTI 2003+
Golf R 2012-2013
Golf Sportwagen 2012-2019
Golf VR6 1997-2003
Jetta GLI 2011+
Jetta S 2011-2019
Jetta VR6 1999-2005
Passat W8 4 Motion 2001-2004
Rabbit 2.5S  2006+
Volvo
C30 T5 2008-2013
V70 R 1997-1999

7. Tuner 5 (T5)

Model Trim Years
Alfa Romeo
Milano Gold 1987-1989
Milano Verde 1987-1989
BMW
2002 Base 1968-1975
3-Series E30, Non-M All
318is 1992-1998
318ti 1995-1999
Z3 1.9L All
Chevrolet
Impala LT 4cyl 2014-2020
Impala ZL1 All
Sonic All 2012-2020
Datsun
240/260/280z 1970-1978
521 1966-1972
Dodge
Charger 1982-1987
Dart SXT (2.4L) All
Neon Naturally Asp 1995-1999
Ford
Contour SVT 1998-2000
Escort ZX2 All
Festiva L 1988-1993
Fiesta 2008-2012
Focus SE 2011-2018
Probe GT 1989-1992
GMC
Sonoma 2.2L 1994-2004
Honda
Accord 1990-1993
Accord EX V6 1994-1997
Accord Sport 2013-2017
Civic 1972-1991
Civic EX 1992-2005
Civic EX 2015-2021
Civic LX 2011-2017
CRX All
Del Sol All
Fit 2007+
Prelude All
Hyundai
Tiburon GS 2007-2008
Veloster Gamma 1.6 GDi 2012+
Jensen
Healey All
Kia
Optima EX 2011-2015
Soul X-Line 2019+
Mazda
2 All
3 Naturally Asp 2004-2013
Protegé 1998-2003
Miata/MX-5 Naturally Asp 1990-2005
RX-7 Not Otherwise Classed 1979-1991
Spec Miata
Mercedes      
190E All
M320
1995-2002
Mercury      
Tracer LTS 1993-1996
MG
MGB 1962-1980
MGB GT 1962-1980
Mini
Cooper Naturally Asp All
Mitsubishi
Mirage All
Nissan
240sx All
Sentra SE-R 1990-1994
Pontiac
Fiero GT 1985-1988
Porsche
914 1.8L 1974-1975
924 1986-1988
924 S 1986-1988
Scion
tC All
Subaru
Forester Sport 2019-2022
Impreza   1992-2001
Impreza
2.5L 2001-2007
Impreza Sport 2012-2016
Legacy L FWD 1995-1999
Suzuki
Swift GT 1989-1994
Toyota
Celica Supra 1982-1986
Corolla XSE Hatchback 2019-2022
MR2 Naturally Asp ALL
Yaris 2006-2013
Triumph
Spitfire 1974-1980
Volkswagen
CC Sport 2.0T and 3.6 VR6 2008-2016
Corrado G60 1989-1993
New Beetle TDI 1998-2006
Passat 1.8T FWD 1997-2000
Volvo
240/242/244/245 1975-1993