colin_koehler
Great SCOTT!
Until the PRO86 ruleset is reflected in the Conference rulebook, I am making a post here and attaching the PDF so folks can readily find it who are building to the class.
PRO86 Rule set here
- Thread starter colin_koehler
- Start date
colin_koehler
Great SCOTT!
In case some folks are having an issue with the PDF not prompting for them - here's the ruleset typed out.
Pro86 Technical Regulations
Version 1.0, 1/9/2026
1. Introduction & General Rules
● 1.1 The "Golden Rule": If a specific component or modification is not explicitly
authorized in these regulations, it is prohibited. All vehicles must remain as delivered
from the factory unless a modification is permitted herein.
● 1.2 Vehicle Eligibility: Toyota 86, Subaru BRZ, and Scion FR-S, Model Years
2013–2020 (chassis codes ZN6/ZC6) equipped with the FA20 engine.
● 1.3 Vehicle Presentation & Appearance:
○ 1.3.1 Professional Standard: All vehicles must maintain a neat, clean, and
professional appearance. Vehicles that are dirty, significantly dented,
rust-perforated, or have missing body panels may be excluded from competition
at the discretion of the Race Director.
○ 1.3.2 Paint & Finish:
■ All body panels must be fully painted or vinyl-wrapped. Mismatched body
panel colors are permitted.
■ Large areas of primer or bare Bondo/body filler are prohibited.
■ The vehicle must be clean and free of excessive dirt, mud, or oil prior to
entering the track.
○ 1.3.3 Body Damage:
■ Bodywork must remain securely attached. Tape (e.g., "racer's tape") may
be used only for temporary emergency repairs during an event, subject to
judgement of the event safety steward. Permanent use of tape to secure
body panels is prohibited.
■ Significant body damage (e.g., crushed rockers, caved-in doors, or loose
bumpers) must be repaired prior to the next event.
■ Missing bumpers, fenders, or headlights/taillights (or suitable blanking
panels) are prohibited.
○ 1.3.4 Graphics & Numbers:
■ Car numbers and class markings must be clearly legible and in good
condition. Peeling, faded, or handwritten numbers are prohibited.
1.4 Fuel
● 1.4.1 Sanctioning Body Compliance: Fuel type, octane rating, and additives must
comply with the General Competition Rules (GCR) or Supplemental Regulations of the
specific event sanctioning body (e.g., NASA, SCCA, ICSCC).
● 1.4.2 Ethanol Limit Exception: Regardless of sanctioning body allowances, the
maximum permitted Ethanol content is 20% by volume.
○ Note: E85 and ethanol blends exceeding 20% are strictly prohibited, even if the
sanctioning body permits them in other classes.
2. Safety
● 2.1 Roll Cage: Roll cages must meet ICSCC (Rule 1105.A.2) or SCCA (GCR Section
9.4.3) standards.
○ 2.1.1 6-point to 8-point cage designs are permitted.
○ 2.1.2 No cage members may protrude through the firewall.
● 2.2 Fire Suppression: A fire suppression system meeting sanctioning body general
regulations is required.
● 2.3 Driver Restraint: SFI/FIA approved harnesses and window nets are required per
sanctioning body rules.
● 2.4 Master Switch: An electrical master kill switch is required per sanctioning body
rules.
3. Weight
● 3.1 Minimum Weight: The minimum weight of the vehicle, including the driver (in full
gear) and fluids at the end of a session, is 2,750 lbs.
● 3.2 Ballast
○ 3.2.1 Ballast may be added to meet the minimum weight requirement.
○ 3.2.2 Mounting Location: Ballast must be mounted securely anywhere within
the passenger compartment.
Note: Mounting in the trunk or engine bay is prohibited.
○ 3.2.3 Hardware: To be considered "securely mounted," ballast must be fastened
using Grade 5 / Metric 8.8 (or higher) bolts with backing plates to prevent
pull-through.
● 3.3 Weight Penalties
○ 3.3.1 Wilwood 6R Wheel Weight: See Section 8.3 regarding the 18 lb minimum
wheel weight requirement for vehicles equipped with Wilwood 6R calipers.
4. Engine & Engine Bay
● 4.1 Internal Components (Strict Stock):
○ 4.1.1 The engine must remain internally stock to OEM specifications. Internal
lightening, balancing, or modification of rotating assemblies is prohibited.
○ 4.1.2 No Rebuild Policy: Engine rebuilding that involves machining is
prohibited.
■ Overboring, sleeving, or honing of cylinders to increase clearance is
prohibited.
■ Cylinders must retain the OEM standard bore size (86.0mm).
■ Replacement pistons must be standard-size OEM units only.
○ 4.1.3 Cylinder Head & Valvetrain:
■ 4.1.3.1 The cylinder head must remain an un-modified OEM casting.
Porting, polishing, extrude honing, or media blasting of intake or exhaust
ports is strictly prohibited. Casting flash must remain present.
■ 4.1.3.2 Decking/Resurfacing: Machining the cylinder head mating
surface is prohibited. If a cylinder head is warped beyond OEM
specifications, it must be replaced.
■ 4.1.3.3 Valvetrain: Camshafts, valves, valve springs, retainers, and
pivots/rockers must be OEM. Titanium valves or retainers are prohibited.
■ 4.1.3.4 Valve Job: Multi-angle valve jobs are permitted to restore sealing,
provided they are centered on the OEM valve guide. Blending the valve
seat into the port ("bowl blending") is prohibited.
■ 4.1.3.5 Head Gasket: Head gaskets must be OEM or aftermarket
replacements of OEM thickness. Thinner "high compression" head
gaskets are prohibited.
● 4.2 Induction System:
○ 4.2.1 The air intake system, including the airbox and filter housing, must remain
OEM.
○ 4.2.2 The "Sound Generator" tube and mechanism may be removed and the
firewall hole plugged.
● 4.3 Exhaust System:
○ 4.3.1 Exhaust manifolds (headers), catalytic converters, and cat-back exhaust
systems are unrestricted.
● 4.4 Cooling & Accessories:
○ 4.4.1 Aftermarket engine oil coolers and larger radiators are permitted.
○ 4.4.2 Oil baffles and pickup tube modifications (for reliability) are permitted.
○ 4.4.3 Plastic engine covers may be removed.
○ 4.4.4 Air conditioning components (compressor, condenser, lines, evaporator)
may be removed entirely.
○ 4.4.5 Heater core lines may be looped or plugged, but the heater core itself must
remain unless removal is required for roll cage installation.
● 4.5 Engine Management (ECU):
○ 4.5.1 The ECU hardware must remain OEM. Aftermarket standalone ECUs (e.g.,
MoTeC, Haltech) are prohibited.
○ 4.5.2 ECU software mapping ("tuning") is permitted.
○ 4.5.3 "Pedal dance" simulators or "Trac-Box" devices are permitted.
● 4.6 Engine Mounts
○ 4.6.1 Strict Stock: Engine mounts must be OEM stock rubber. Aftermarket
mounts (Polyurethane, Solid, etc.) are prohibited.
○ 4.6.2 Stiffening additives (e.g., window weld, void fillers) are prohibited.
○ 4.6.3 The location of the engine and transmission must remain in the OEM
position; lowering or relocating the drivetrain is prohibited.
● 4.7 Wiring & Electrical:
○ 4.7.1 The wiring harness must remain stock. Cutting, thinning, or removing
unused plugs/wires from the main harness to save weight is prohibited.
○ 4.7.2 The battery may be replaced with a lightweight unit (e.g., AGM, Lithium) but
must be securely mounted. If located in the cockpit, it must be in a sealed
marine-grade box.
5. Drivetrain
● 5.1 Transmission:
○ 5.1.1 OEM Manual or Automatic transmissions are permitted.
○ 5.1.2 Internal gear ratios must remain OEM standard.
○ 5.1.3 Automatic transmission software tuning is permitted.
○ 5.1.4 Transmission coolers are permitted.
○ 5.1.5 Shifter & Shifting Mechanism
■ 5.1.5.1 Short-throw shifters of the lever-replacement type are permitted
(e.g., TRD, STI, Kartboy).
■ 5.1.5.2 The shifter assembly must remain in the OEM location and utilize
the OEM mounting pattern.
■ 5.1.5.3 Prohibited: Chassis-mounted shifters (e.g., CAE, IRP,
Coolerworx) or any shifter that requires cutting the center console or
transmission tunnel are prohibited.
■ 5.1.5.4 Shifter Bushings: The rear shifter carrier bushing (stay bushing)
may be replaced with an aftermarket Polyurethane or solid metallic
bushing.
● 5.2 Differential:
○ 5.2.1 Only the OEM Torsen Limited Slip Differential is permitted. Aftermarket
mechanical LSDs (clutch-type, etc.) are prohibited.
○ 5.2.2 Final Drive Ratio: Permitted ratios are 4.10 or 4.30.
○ 5.2.3 Differential coolers and high-capacity covers are permitted.
● 5.3 Clutch & Flywheel: Aftermarket clutches and flywheels are permitted.
● 5.4 Differential & Drivetrain Mounts
○ 5.4.1 Differential bushings and transmission mounts must be OEM stock rubber.
○ 5.4.2 Differential subframe inserts (e.g., Whiteline inserts) are prohibited.
○ 5.4.3 Rear Subframe bushings must be OEM stock rubber. Solid risers or
aluminum subframe collars are prohibited.
Pro86 Technical Regulations
Version 1.0, 1/9/2026
1. Introduction & General Rules
● 1.1 The "Golden Rule": If a specific component or modification is not explicitly
authorized in these regulations, it is prohibited. All vehicles must remain as delivered
from the factory unless a modification is permitted herein.
● 1.2 Vehicle Eligibility: Toyota 86, Subaru BRZ, and Scion FR-S, Model Years
2013–2020 (chassis codes ZN6/ZC6) equipped with the FA20 engine.
● 1.3 Vehicle Presentation & Appearance:
○ 1.3.1 Professional Standard: All vehicles must maintain a neat, clean, and
professional appearance. Vehicles that are dirty, significantly dented,
rust-perforated, or have missing body panels may be excluded from competition
at the discretion of the Race Director.
○ 1.3.2 Paint & Finish:
■ All body panels must be fully painted or vinyl-wrapped. Mismatched body
panel colors are permitted.
■ Large areas of primer or bare Bondo/body filler are prohibited.
■ The vehicle must be clean and free of excessive dirt, mud, or oil prior to
entering the track.
○ 1.3.3 Body Damage:
■ Bodywork must remain securely attached. Tape (e.g., "racer's tape") may
be used only for temporary emergency repairs during an event, subject to
judgement of the event safety steward. Permanent use of tape to secure
body panels is prohibited.
■ Significant body damage (e.g., crushed rockers, caved-in doors, or loose
bumpers) must be repaired prior to the next event.
■ Missing bumpers, fenders, or headlights/taillights (or suitable blanking
panels) are prohibited.
○ 1.3.4 Graphics & Numbers:
■ Car numbers and class markings must be clearly legible and in good
condition. Peeling, faded, or handwritten numbers are prohibited.
1.4 Fuel
● 1.4.1 Sanctioning Body Compliance: Fuel type, octane rating, and additives must
comply with the General Competition Rules (GCR) or Supplemental Regulations of the
specific event sanctioning body (e.g., NASA, SCCA, ICSCC).
● 1.4.2 Ethanol Limit Exception: Regardless of sanctioning body allowances, the
maximum permitted Ethanol content is 20% by volume.
○ Note: E85 and ethanol blends exceeding 20% are strictly prohibited, even if the
sanctioning body permits them in other classes.
2. Safety
● 2.1 Roll Cage: Roll cages must meet ICSCC (Rule 1105.A.2) or SCCA (GCR Section
9.4.3) standards.
○ 2.1.1 6-point to 8-point cage designs are permitted.
○ 2.1.2 No cage members may protrude through the firewall.
● 2.2 Fire Suppression: A fire suppression system meeting sanctioning body general
regulations is required.
● 2.3 Driver Restraint: SFI/FIA approved harnesses and window nets are required per
sanctioning body rules.
● 2.4 Master Switch: An electrical master kill switch is required per sanctioning body
rules.
3. Weight
● 3.1 Minimum Weight: The minimum weight of the vehicle, including the driver (in full
gear) and fluids at the end of a session, is 2,750 lbs.
● 3.2 Ballast
○ 3.2.1 Ballast may be added to meet the minimum weight requirement.
○ 3.2.2 Mounting Location: Ballast must be mounted securely anywhere within
the passenger compartment.
Note: Mounting in the trunk or engine bay is prohibited.
○ 3.2.3 Hardware: To be considered "securely mounted," ballast must be fastened
using Grade 5 / Metric 8.8 (or higher) bolts with backing plates to prevent
pull-through.
● 3.3 Weight Penalties
○ 3.3.1 Wilwood 6R Wheel Weight: See Section 8.3 regarding the 18 lb minimum
wheel weight requirement for vehicles equipped with Wilwood 6R calipers.
4. Engine & Engine Bay
● 4.1 Internal Components (Strict Stock):
○ 4.1.1 The engine must remain internally stock to OEM specifications. Internal
lightening, balancing, or modification of rotating assemblies is prohibited.
○ 4.1.2 No Rebuild Policy: Engine rebuilding that involves machining is
prohibited.
■ Overboring, sleeving, or honing of cylinders to increase clearance is
prohibited.
■ Cylinders must retain the OEM standard bore size (86.0mm).
■ Replacement pistons must be standard-size OEM units only.
○ 4.1.3 Cylinder Head & Valvetrain:
■ 4.1.3.1 The cylinder head must remain an un-modified OEM casting.
Porting, polishing, extrude honing, or media blasting of intake or exhaust
ports is strictly prohibited. Casting flash must remain present.
■ 4.1.3.2 Decking/Resurfacing: Machining the cylinder head mating
surface is prohibited. If a cylinder head is warped beyond OEM
specifications, it must be replaced.
■ 4.1.3.3 Valvetrain: Camshafts, valves, valve springs, retainers, and
pivots/rockers must be OEM. Titanium valves or retainers are prohibited.
■ 4.1.3.4 Valve Job: Multi-angle valve jobs are permitted to restore sealing,
provided they are centered on the OEM valve guide. Blending the valve
seat into the port ("bowl blending") is prohibited.
■ 4.1.3.5 Head Gasket: Head gaskets must be OEM or aftermarket
replacements of OEM thickness. Thinner "high compression" head
gaskets are prohibited.
● 4.2 Induction System:
○ 4.2.1 The air intake system, including the airbox and filter housing, must remain
OEM.
○ 4.2.2 The "Sound Generator" tube and mechanism may be removed and the
firewall hole plugged.
● 4.3 Exhaust System:
○ 4.3.1 Exhaust manifolds (headers), catalytic converters, and cat-back exhaust
systems are unrestricted.
● 4.4 Cooling & Accessories:
○ 4.4.1 Aftermarket engine oil coolers and larger radiators are permitted.
○ 4.4.2 Oil baffles and pickup tube modifications (for reliability) are permitted.
○ 4.4.3 Plastic engine covers may be removed.
○ 4.4.4 Air conditioning components (compressor, condenser, lines, evaporator)
may be removed entirely.
○ 4.4.5 Heater core lines may be looped or plugged, but the heater core itself must
remain unless removal is required for roll cage installation.
● 4.5 Engine Management (ECU):
○ 4.5.1 The ECU hardware must remain OEM. Aftermarket standalone ECUs (e.g.,
MoTeC, Haltech) are prohibited.
○ 4.5.2 ECU software mapping ("tuning") is permitted.
○ 4.5.3 "Pedal dance" simulators or "Trac-Box" devices are permitted.
● 4.6 Engine Mounts
○ 4.6.1 Strict Stock: Engine mounts must be OEM stock rubber. Aftermarket
mounts (Polyurethane, Solid, etc.) are prohibited.
○ 4.6.2 Stiffening additives (e.g., window weld, void fillers) are prohibited.
○ 4.6.3 The location of the engine and transmission must remain in the OEM
position; lowering or relocating the drivetrain is prohibited.
● 4.7 Wiring & Electrical:
○ 4.7.1 The wiring harness must remain stock. Cutting, thinning, or removing
unused plugs/wires from the main harness to save weight is prohibited.
○ 4.7.2 The battery may be replaced with a lightweight unit (e.g., AGM, Lithium) but
must be securely mounted. If located in the cockpit, it must be in a sealed
marine-grade box.
5. Drivetrain
● 5.1 Transmission:
○ 5.1.1 OEM Manual or Automatic transmissions are permitted.
○ 5.1.2 Internal gear ratios must remain OEM standard.
○ 5.1.3 Automatic transmission software tuning is permitted.
○ 5.1.4 Transmission coolers are permitted.
○ 5.1.5 Shifter & Shifting Mechanism
■ 5.1.5.1 Short-throw shifters of the lever-replacement type are permitted
(e.g., TRD, STI, Kartboy).
■ 5.1.5.2 The shifter assembly must remain in the OEM location and utilize
the OEM mounting pattern.
■ 5.1.5.3 Prohibited: Chassis-mounted shifters (e.g., CAE, IRP,
Coolerworx) or any shifter that requires cutting the center console or
transmission tunnel are prohibited.
■ 5.1.5.4 Shifter Bushings: The rear shifter carrier bushing (stay bushing)
may be replaced with an aftermarket Polyurethane or solid metallic
bushing.
● 5.2 Differential:
○ 5.2.1 Only the OEM Torsen Limited Slip Differential is permitted. Aftermarket
mechanical LSDs (clutch-type, etc.) are prohibited.
○ 5.2.2 Final Drive Ratio: Permitted ratios are 4.10 or 4.30.
○ 5.2.3 Differential coolers and high-capacity covers are permitted.
● 5.3 Clutch & Flywheel: Aftermarket clutches and flywheels are permitted.
● 5.4 Differential & Drivetrain Mounts
○ 5.4.1 Differential bushings and transmission mounts must be OEM stock rubber.
○ 5.4.2 Differential subframe inserts (e.g., Whiteline inserts) are prohibited.
○ 5.4.3 Rear Subframe bushings must be OEM stock rubber. Solid risers or
aluminum subframe collars are prohibited.
colin_koehler
Great SCOTT!
6. Suspension
● 6.1 Shock Absorbers & Springs (Current Regulations: 2026–2027)
○ 6.1.1 Permitted Shocks: Shock absorbers may be replaced with off-the-shelf
(OTS) units meeting the following criteria:
■ Must be Single-Adjustable (1-way) or Non-Adjustable.
■ Remote reservoirs are prohibited.
■ Must utilize OEM attachment points.
■ Must have a published catalog number and be generally available (annual
sales >100 units).
○ 6.1.2 Permitted Shock Examples: Koni GTS, Bilstein B14, Bilstein B16
(single-way), Ohlins Road & Track (single-way), MCS 1-Way (Motion Control
Suspension), RCE Super Street 1.
○ 6.1.3 Prohibited Shock Examples: RCE Tarmac 2 (2-way adjustable).
○ 6.1.4 Springs (2026–2027):
■ Spring rates, lengths, and manufacturers are Unrestricted (Open).
■ Helper/tender springs are permitted.
■ Coilover conversions are permitted provided they adhere to the shock
rules in 6.1.1.
● 6.2 Future Regulation (Effective Jan 1, 2028)
○ 6.2.1 Spec Shock Kit: Effective January 1, 2028, the only permitted shock
absorber kits will be the Bilstein B14 (PSS) or Bilstein B16 (PSS10). All other
dampers will be prohibited.
○ 6.2.2 Permitted Part Numbers:
■ Bilstein B14 (PSS): Part #47-228337 OR #47-330733.
■ Bilstein B16 (PSS10): Part #48-228299 OR #48-330725.
○ 6.2.3 Mandated Springs:
■ Competitors must utilize the specific springs supplied by Bilstein within
the permitted kits listed in 6.2.2. Substitution of springs (e.g., swapping for
Swift or Hyperco linear springs) is strictly prohibited.
■ Required Bilstein Spring Specifications:
● Front: Progressive Rate, main spring rate 257 lbs/in.
● Rear: Progressive Rate, main spring rate 378 lbs/in.
● 6.3 Ride Height:
○ 6.3.1 Minimum ride height is 4.0 inches, measured from the lowest point of the
rocker panel or frame rail to the ground with the driver seated.
● 6.4 Bushings
○ 6.4.1 Stock Requirement: All suspension, steering, and subframe bushings
must remain OEM stock rubber.
○ 6.4.2 Prohibitions: Polyurethane, Delrin, solid metal, or spherical bearing
bushings are prohibited.
○ 6.4.3 Exceptions:
■ (A) Aftermarket Arms: Non-OEM bushings/bearings are permitted ONLY
if they are integral components of the specific aftermarket control arms or
camber plates explicitly authorized in Sections 6.5 and 6.6.
■ (B) Sway Bars: Sway bar bushings may be OEM or the specific
polyurethane bushings supplied within the permitted Eibach Anti-Roll Kit
(See 6.7).
● 6.5 Camber Plates & Upper Mounts:
○ 6.5.1 Front camber plates and top hats are unrestricted provided no modification
to the chassis mounting points is required.
○ 6.5.2 Permitted Examples: OEM stock, Pedders offset mounts, Verus
Adjustable.
● 6.6 Control Arms & Alignment Hardware:
○ 6.6.1 Front Camber: Camber bolts (OEM or Whiteline eccentric) are permitted.
○ 6.6.2 Rear Camber: Rear camber adjustment may be achieved via ONE of the
following methods (not both):
■ (A) Aftermarket threaded Rear Upper Control Arms (RUCA).
■ (B) Aftermarket adjustable Rear Lower Control Arms (LCA) listed in 6.6.3.
○ 6.6.3 Permitted Adjustable LCA Models:
■ SPC Performance: Part #67660 (Quantity: 2 required).
■ Whiteline: Part #KTA216A (Supplied as a complete pair).
Note: The Whiteline "Motorsport" arm (Part #KTA139A) is prohibited to
ensure parity with the stamped-steel SPC arm.
○ 6.6.4 Rear Toe: Aftermarket adjustable rear toe links are permitted to allow for
precise alignment.
■ Permitted Models:
● SPC Performance: Part #67655.
● SPL Parts: Part #SPL RTAEL FRS (Titanium Series Rear Toe
Arms with Eccentric Lockout).
Note regarding SPL: Competitors should use the EL
(Eccentric Lockout) version to prevent alignment slip.
○ 6.6.5 Front Control Arms: The front lower control arms must remain OEM.
■ 6.6.5.1 Aftermarket replacement arms, extended ball joints, or roll-center
correction kits are prohibited.
■ 6.6.5.2 Bushings must remain OEM rubber (per Section 6.4.1).
● 6.7 Anti-Roll Bars (Sway Bars):
○ 6.7.1 Permitted bars include any OEM sway bar from an eligible model year, or
Eibach aftermarket bars.
○ 6.7.2 Disconnecting sway bar end links is permitted.
○ 6.7.3 Eibach Part Reference:
■ Eibach Anti-Roll Kit (Front/Rear): Part #82105.320
■ Eibach Front Bar Only (25mm): Part #82105.310
■ Eibach Rear Bar Only (19mm): Part #82105.312
7. Tires & Wheels
● 7.1 Spec Dry Tire
○ 7.1.1 The exclusive dry tire permitted for competition is the Hankook Ventus
RS4.
○ 7.1.2 Spec Dry tires may be used in wet or rain conditions at the competitor's
discretion, unless the Race Director has declared a 'Wet' session and explicitly
mandated the use of Rain Tires for safety.
○ 7.1.3 Tire shaving is permitted.
● 7.2 Tire Size: Maximum tire width is 245mm.
● 7.3 Wheels:
○ 7.3.1 Diameter: 17 inches.
○ 7.3.2 Maximum Width: 9 inches.
○ 7.3.3 Minimum Weight: 14 lbs per wheel (See 8.3 for Brake Penalty Exception).
○ 7.3.4 Wheels must have a public catalog number.
● 7.4 Spec Rain Tire
○ 7.4.1 The exclusive tire permitted for use as a dedicated rain tire is the
Continental ExtremeContact Sport 02.
○ 7.4.2 Rain tires may be used at the competitor's discretion during any session, or
as mandated by the Race Director during "Wet" declared sessions.
○ 7.4.3 Tire shaving or cutting of tread on rain tires is prohibited.
● 6.1 Shock Absorbers & Springs (Current Regulations: 2026–2027)
○ 6.1.1 Permitted Shocks: Shock absorbers may be replaced with off-the-shelf
(OTS) units meeting the following criteria:
■ Must be Single-Adjustable (1-way) or Non-Adjustable.
■ Remote reservoirs are prohibited.
■ Must utilize OEM attachment points.
■ Must have a published catalog number and be generally available (annual
sales >100 units).
○ 6.1.2 Permitted Shock Examples: Koni GTS, Bilstein B14, Bilstein B16
(single-way), Ohlins Road & Track (single-way), MCS 1-Way (Motion Control
Suspension), RCE Super Street 1.
○ 6.1.3 Prohibited Shock Examples: RCE Tarmac 2 (2-way adjustable).
○ 6.1.4 Springs (2026–2027):
■ Spring rates, lengths, and manufacturers are Unrestricted (Open).
■ Helper/tender springs are permitted.
■ Coilover conversions are permitted provided they adhere to the shock
rules in 6.1.1.
● 6.2 Future Regulation (Effective Jan 1, 2028)
○ 6.2.1 Spec Shock Kit: Effective January 1, 2028, the only permitted shock
absorber kits will be the Bilstein B14 (PSS) or Bilstein B16 (PSS10). All other
dampers will be prohibited.
○ 6.2.2 Permitted Part Numbers:
■ Bilstein B14 (PSS): Part #47-228337 OR #47-330733.
■ Bilstein B16 (PSS10): Part #48-228299 OR #48-330725.
○ 6.2.3 Mandated Springs:
■ Competitors must utilize the specific springs supplied by Bilstein within
the permitted kits listed in 6.2.2. Substitution of springs (e.g., swapping for
Swift or Hyperco linear springs) is strictly prohibited.
■ Required Bilstein Spring Specifications:
● Front: Progressive Rate, main spring rate 257 lbs/in.
● Rear: Progressive Rate, main spring rate 378 lbs/in.
● 6.3 Ride Height:
○ 6.3.1 Minimum ride height is 4.0 inches, measured from the lowest point of the
rocker panel or frame rail to the ground with the driver seated.
● 6.4 Bushings
○ 6.4.1 Stock Requirement: All suspension, steering, and subframe bushings
must remain OEM stock rubber.
○ 6.4.2 Prohibitions: Polyurethane, Delrin, solid metal, or spherical bearing
bushings are prohibited.
○ 6.4.3 Exceptions:
■ (A) Aftermarket Arms: Non-OEM bushings/bearings are permitted ONLY
if they are integral components of the specific aftermarket control arms or
camber plates explicitly authorized in Sections 6.5 and 6.6.
■ (B) Sway Bars: Sway bar bushings may be OEM or the specific
polyurethane bushings supplied within the permitted Eibach Anti-Roll Kit
(See 6.7).
● 6.5 Camber Plates & Upper Mounts:
○ 6.5.1 Front camber plates and top hats are unrestricted provided no modification
to the chassis mounting points is required.
○ 6.5.2 Permitted Examples: OEM stock, Pedders offset mounts, Verus
Adjustable.
● 6.6 Control Arms & Alignment Hardware:
○ 6.6.1 Front Camber: Camber bolts (OEM or Whiteline eccentric) are permitted.
○ 6.6.2 Rear Camber: Rear camber adjustment may be achieved via ONE of the
following methods (not both):
■ (A) Aftermarket threaded Rear Upper Control Arms (RUCA).
■ (B) Aftermarket adjustable Rear Lower Control Arms (LCA) listed in 6.6.3.
○ 6.6.3 Permitted Adjustable LCA Models:
■ SPC Performance: Part #67660 (Quantity: 2 required).
■ Whiteline: Part #KTA216A (Supplied as a complete pair).
Note: The Whiteline "Motorsport" arm (Part #KTA139A) is prohibited to
ensure parity with the stamped-steel SPC arm.
○ 6.6.4 Rear Toe: Aftermarket adjustable rear toe links are permitted to allow for
precise alignment.
■ Permitted Models:
● SPC Performance: Part #67655.
● SPL Parts: Part #SPL RTAEL FRS (Titanium Series Rear Toe
Arms with Eccentric Lockout).
Note regarding SPL: Competitors should use the EL
(Eccentric Lockout) version to prevent alignment slip.
○ 6.6.5 Front Control Arms: The front lower control arms must remain OEM.
■ 6.6.5.1 Aftermarket replacement arms, extended ball joints, or roll-center
correction kits are prohibited.
■ 6.6.5.2 Bushings must remain OEM rubber (per Section 6.4.1).
● 6.7 Anti-Roll Bars (Sway Bars):
○ 6.7.1 Permitted bars include any OEM sway bar from an eligible model year, or
Eibach aftermarket bars.
○ 6.7.2 Disconnecting sway bar end links is permitted.
○ 6.7.3 Eibach Part Reference:
■ Eibach Anti-Roll Kit (Front/Rear): Part #82105.320
■ Eibach Front Bar Only (25mm): Part #82105.310
■ Eibach Rear Bar Only (19mm): Part #82105.312
7. Tires & Wheels
● 7.1 Spec Dry Tire
○ 7.1.1 The exclusive dry tire permitted for competition is the Hankook Ventus
RS4.
○ 7.1.2 Spec Dry tires may be used in wet or rain conditions at the competitor's
discretion, unless the Race Director has declared a 'Wet' session and explicitly
mandated the use of Rain Tires for safety.
○ 7.1.3 Tire shaving is permitted.
● 7.2 Tire Size: Maximum tire width is 245mm.
● 7.3 Wheels:
○ 7.3.1 Diameter: 17 inches.
○ 7.3.2 Maximum Width: 9 inches.
○ 7.3.3 Minimum Weight: 14 lbs per wheel (See 8.3 for Brake Penalty Exception).
○ 7.3.4 Wheels must have a public catalog number.
● 7.4 Spec Rain Tire
○ 7.4.1 The exclusive tire permitted for use as a dedicated rain tire is the
Continental ExtremeContact Sport 02.
○ 7.4.2 Rain tires may be used at the competitor's discretion during any session, or
as mandated by the Race Director during "Wet" declared sessions.
○ 7.4.3 Tire shaving or cutting of tread on rain tires is prohibited.
colin_koehler
Great SCOTT!
8. Brakes
● 8.1 Calipers
○ 8.1.1 Permitted Calipers:
■ OEM Stock sliding calipers.
■ OEM "Performance Pack" Brembo calipers.
■ Aftermarket 4-piston calipers (e.g., AP Racing, Wilwood).
○ 8.1.2 Calipers with more than 4 pistons are prohibited, with the exception noted
in 8.3.
● 8.2 Rotors & Pads
○ 8.2.1 Maximum Rotor Diameter: The maximum rotor diameter is 300mm, with
the following specific exceptions:
■ (A) OEM "Performance Pack" Brembo: Vehicles equipped with the
OEM Brembo calipers may utilize the corresponding OEM-sized rotors
(326mm Front / 316mm Rear).
■ (B) Wilwood 6R Kit: Vehicles equipped with the permitted Wilwood 6R
calipers may utilize the rotors supplied specifically for that kit (up to
328mm/12.9").
○ 8.2.2 Brake pads and fluid (DOT 4/5.1) are unrestricted.
○ 8.2.3 Brake lines are unrestricted provided the OEM ABS system, booster, and
master cylinder remain unchanged.
● 8.3 Exceptions & Wilwood 6R Wheel Weight Penalty
○ 8.3.1 OEM Exception (No Penalty): Competitors utilizing OEM Brembo
(Performance Pack) calipers are exempt from any wheel weight penalty and may
adhere to the standard 14 lb minimum wheel weight.
○ 8.3.2 Wilwood 6R Penalty: Competitors utilizing Wilwood 6R calipers are
permitted, subject to a mandatory Wheel Weight Penalty.
○ 8.3.3 Penalty Specification: If utilizing Wilwood 6R calipers, the minimum wheel
weight is increased to 18 lbs per wheel.
● 8.4 Brake Cooling
○ 8.4.1 Brake ducting systems are permitted for the front brakes only.
○ 8.4.2 Backing Plates: OEM dust shields may be removed or replaced with
aftermarket vented backing plates (e.g., Verus, APR) to accept duct hoses.
○ 8.4.3 Routing: Flexible high-temperature hoses may be used to channel air from
the front of the vehicle to the brake rotors.
○ 8.4.4 In-Line Fans: Electric in-line blowers (bilge pumps) are prohibited. Cooling
must be passive.
9. Body & Aero
● 9.1 Bodywork:
○ 9.1.1 Body panels must remain OEM steel/aluminum. Lightweight replacement
panels (carbon fiber hoods, fiberglass doors) are prohibited.
○ 9.1.2 Fenders may be rolled inside for tire clearance, but the outer profile of the
fender must remain unchanged. Widebody kits and fender flares are prohibited.
○ 9.1.3 Plastic fender liners and splash guards may be removed.
○ 9.1.4 Seam welding of the chassis is prohibited.
○ 9.1.5 Fog Lights & DRLs
■ 9.1.5.1 Fog light assemblies and Daytime Running Lights (DRLs) located
in the front bumper may be removed to facilitate brake cooling intakes.
■ 9.1.5.2 Integrated Assemblies (2017+ Models): For 2017–2020 models
(Toyota 86 & Subaru BRZ), the entire integrated Fog Light/DRL housing
and/or the black plastic bumper bezel (including the "triangular" 86 bezel)
may be removed.
■ 9.1.5.3 The resulting holes may be used as air intakes for brake ducting
hoses.
■ 9.1.5.4 Cutting of the main bumper skin, grille, or lower splitter area to
create new air inlets is prohibited. Air must be sourced from the grille area
or the factory fog light/DRL locations.
■ 9.1.5.5 FR-S Specific Note (2013–2016): On Scion FR-S models, the
front turn signal is located within the bumper cover. When removing fog
light components for brake ducting, the turn signal assembly must
remain installed and functional. Removing the turn signal housing to
increase airflow is prohibited.
● 9.2 Hood & Trunk:
○ 9.2.1 The OEM hood latch system must remain functional, OR it may be replaced
with hood pins. If the stock latch is removed, hood pins are mandatory.
○ 9.2.2 Trunk latches must remain functional or be replaced with pins/springs.
● 9.3 Towing:
○ 9.3.1 Tow eyes or straps are mandatory front and rear.
○ 9.3.2 Tow points must be accessible without removing bodywork and capable of
towing the car's full weight.
● 9.4 Aerodynamics:
○ 9.4.1 Aftermarket aerodynamic aids (wings, splitters, canards, diffusers) are
prohibited.
○ 9.4.2 Front lips are prohibited.
○ 9.4.3 OEM or OEM-style trunk cosmetic spoilers are permitted.
○ 9.4.4 The OEM Subaru tS Carbon Fiber wing is prohibited.
○ 9.4.5 Hood vents are permitted only if blocked/sealed on both sides.
● 9.5 Glass:
○ 9.5.1 Windshield and windows must be OEM glass or equivalent.
○ 9.5.2 Lexan front windshield is permitted if 1/4" minimum thickness.
○ 9.5.3 Side door glass may be removed entirely. If retained, the glass must be
OEM or equivalent and must remain functional (can be rolled up/down) or be
permanently fixed in the closed position.
10. Interior
● 10.1 Dashboard & Trim:
○ 10.1.1 The upper dashboard shell must remain installed and securely mounted.
○ 10.1.2 Lower dash panels, glovebox, center console, headliner, carpet,
soundproofing, and rear seats may be removed.
○ 10.1.3 Driver and passenger door cards may be removed only if necessary to fit
roll cage door bars. If removed, sharp metal edges must be covered/protected.
● 10.2 Driver Controls:
○ 10.2.1 The steering wheel is unrestricted. Quick-release adapters are permitted.
○ 10.2.2 Steering Column Lock:
● 10.2.2.1 The steering column lock mechanism is permitted to remain
installed.
● 10.2.2.2 It is the sole responsibility of the competitor to ensure the
steering lock does not engage while the vehicle is in motion or being
towed.
● 10.2.2.3 Push-Button Start Advisory: Competitors with Push-Button
Start (Keyless Access) are advised to mechanically disable the steering
lock mechanism (e.g., removal of the locking assembly or pin). In the
event of a battery failure or Master Switch activation, the electronic
steering lock cannot be disengaged, which may result in significant
vehicle damage during towing/recovery.
○ 10.2.3 Pedal covers are unrestricted.
○ 10.2.4 A driver's side dead pedal/footrest is permitted.
● 10.3 Electronics & Data:
○ 10.3.1 Aftermarket gauges (oil pressure, water temp, etc.) are permitted.
○ 10.3.2 Data acquisition systems (Aim, Garmin, etc.) are permitted provided they
are standalone and do not interfere with vehicle management systems.
● 10.4 Safety:
○ 10.4.1 Airbags must be removed. Airbag wiring and sensors may be retained.
○ 10.4.2 Unused bracketry (e.g., rear seat brackets) may be removed only if it does
not compromise chassis structural integrity.
11. Fuel System
● 11.1 Fuel pumps may be replaced but must not exceed OEM flow specifications.
● 11.2 Extended capacity fuel cells are permitted (refer to SCCA specifications).
● 11.3 Anti-starvation modifications (hydramats, surge tanks) are permitted subject to rules
11.4.
● 11.4 Fuel Starvation & Surge Tanks:
○ 11.4.1 Anti-Starvation: Passive in-tank solutions (e.g., Verus/Velox fuel door,
Holley HydraMat) are permitted.
○ 11.4.2 Surge Tank Allowance: Aftermarket external fuel surge tanks are
permitted, provided they are separated from the driver's compartment by a metal
firewall or sealed enclosure.
○ 11.4.3 Fuel Pumps: Secondary external lift pumps are permitted only if utilized in
conjunction with a permitted surge tank.
● 8.1 Calipers
○ 8.1.1 Permitted Calipers:
■ OEM Stock sliding calipers.
■ OEM "Performance Pack" Brembo calipers.
■ Aftermarket 4-piston calipers (e.g., AP Racing, Wilwood).
○ 8.1.2 Calipers with more than 4 pistons are prohibited, with the exception noted
in 8.3.
● 8.2 Rotors & Pads
○ 8.2.1 Maximum Rotor Diameter: The maximum rotor diameter is 300mm, with
the following specific exceptions:
■ (A) OEM "Performance Pack" Brembo: Vehicles equipped with the
OEM Brembo calipers may utilize the corresponding OEM-sized rotors
(326mm Front / 316mm Rear).
■ (B) Wilwood 6R Kit: Vehicles equipped with the permitted Wilwood 6R
calipers may utilize the rotors supplied specifically for that kit (up to
328mm/12.9").
○ 8.2.2 Brake pads and fluid (DOT 4/5.1) are unrestricted.
○ 8.2.3 Brake lines are unrestricted provided the OEM ABS system, booster, and
master cylinder remain unchanged.
● 8.3 Exceptions & Wilwood 6R Wheel Weight Penalty
○ 8.3.1 OEM Exception (No Penalty): Competitors utilizing OEM Brembo
(Performance Pack) calipers are exempt from any wheel weight penalty and may
adhere to the standard 14 lb minimum wheel weight.
○ 8.3.2 Wilwood 6R Penalty: Competitors utilizing Wilwood 6R calipers are
permitted, subject to a mandatory Wheel Weight Penalty.
○ 8.3.3 Penalty Specification: If utilizing Wilwood 6R calipers, the minimum wheel
weight is increased to 18 lbs per wheel.
● 8.4 Brake Cooling
○ 8.4.1 Brake ducting systems are permitted for the front brakes only.
○ 8.4.2 Backing Plates: OEM dust shields may be removed or replaced with
aftermarket vented backing plates (e.g., Verus, APR) to accept duct hoses.
○ 8.4.3 Routing: Flexible high-temperature hoses may be used to channel air from
the front of the vehicle to the brake rotors.
○ 8.4.4 In-Line Fans: Electric in-line blowers (bilge pumps) are prohibited. Cooling
must be passive.
9. Body & Aero
● 9.1 Bodywork:
○ 9.1.1 Body panels must remain OEM steel/aluminum. Lightweight replacement
panels (carbon fiber hoods, fiberglass doors) are prohibited.
○ 9.1.2 Fenders may be rolled inside for tire clearance, but the outer profile of the
fender must remain unchanged. Widebody kits and fender flares are prohibited.
○ 9.1.3 Plastic fender liners and splash guards may be removed.
○ 9.1.4 Seam welding of the chassis is prohibited.
○ 9.1.5 Fog Lights & DRLs
■ 9.1.5.1 Fog light assemblies and Daytime Running Lights (DRLs) located
in the front bumper may be removed to facilitate brake cooling intakes.
■ 9.1.5.2 Integrated Assemblies (2017+ Models): For 2017–2020 models
(Toyota 86 & Subaru BRZ), the entire integrated Fog Light/DRL housing
and/or the black plastic bumper bezel (including the "triangular" 86 bezel)
may be removed.
■ 9.1.5.3 The resulting holes may be used as air intakes for brake ducting
hoses.
■ 9.1.5.4 Cutting of the main bumper skin, grille, or lower splitter area to
create new air inlets is prohibited. Air must be sourced from the grille area
or the factory fog light/DRL locations.
■ 9.1.5.5 FR-S Specific Note (2013–2016): On Scion FR-S models, the
front turn signal is located within the bumper cover. When removing fog
light components for brake ducting, the turn signal assembly must
remain installed and functional. Removing the turn signal housing to
increase airflow is prohibited.
● 9.2 Hood & Trunk:
○ 9.2.1 The OEM hood latch system must remain functional, OR it may be replaced
with hood pins. If the stock latch is removed, hood pins are mandatory.
○ 9.2.2 Trunk latches must remain functional or be replaced with pins/springs.
● 9.3 Towing:
○ 9.3.1 Tow eyes or straps are mandatory front and rear.
○ 9.3.2 Tow points must be accessible without removing bodywork and capable of
towing the car's full weight.
● 9.4 Aerodynamics:
○ 9.4.1 Aftermarket aerodynamic aids (wings, splitters, canards, diffusers) are
prohibited.
○ 9.4.2 Front lips are prohibited.
○ 9.4.3 OEM or OEM-style trunk cosmetic spoilers are permitted.
○ 9.4.4 The OEM Subaru tS Carbon Fiber wing is prohibited.
○ 9.4.5 Hood vents are permitted only if blocked/sealed on both sides.
● 9.5 Glass:
○ 9.5.1 Windshield and windows must be OEM glass or equivalent.
○ 9.5.2 Lexan front windshield is permitted if 1/4" minimum thickness.
○ 9.5.3 Side door glass may be removed entirely. If retained, the glass must be
OEM or equivalent and must remain functional (can be rolled up/down) or be
permanently fixed in the closed position.
10. Interior
● 10.1 Dashboard & Trim:
○ 10.1.1 The upper dashboard shell must remain installed and securely mounted.
○ 10.1.2 Lower dash panels, glovebox, center console, headliner, carpet,
soundproofing, and rear seats may be removed.
○ 10.1.3 Driver and passenger door cards may be removed only if necessary to fit
roll cage door bars. If removed, sharp metal edges must be covered/protected.
● 10.2 Driver Controls:
○ 10.2.1 The steering wheel is unrestricted. Quick-release adapters are permitted.
○ 10.2.2 Steering Column Lock:
● 10.2.2.1 The steering column lock mechanism is permitted to remain
installed.
● 10.2.2.2 It is the sole responsibility of the competitor to ensure the
steering lock does not engage while the vehicle is in motion or being
towed.
● 10.2.2.3 Push-Button Start Advisory: Competitors with Push-Button
Start (Keyless Access) are advised to mechanically disable the steering
lock mechanism (e.g., removal of the locking assembly or pin). In the
event of a battery failure or Master Switch activation, the electronic
steering lock cannot be disengaged, which may result in significant
vehicle damage during towing/recovery.
○ 10.2.3 Pedal covers are unrestricted.
○ 10.2.4 A driver's side dead pedal/footrest is permitted.
● 10.3 Electronics & Data:
○ 10.3.1 Aftermarket gauges (oil pressure, water temp, etc.) are permitted.
○ 10.3.2 Data acquisition systems (Aim, Garmin, etc.) are permitted provided they
are standalone and do not interfere with vehicle management systems.
● 10.4 Safety:
○ 10.4.1 Airbags must be removed. Airbag wiring and sensors may be retained.
○ 10.4.2 Unused bracketry (e.g., rear seat brackets) may be removed only if it does
not compromise chassis structural integrity.
11. Fuel System
● 11.1 Fuel pumps may be replaced but must not exceed OEM flow specifications.
● 11.2 Extended capacity fuel cells are permitted (refer to SCCA specifications).
● 11.3 Anti-starvation modifications (hydramats, surge tanks) are permitted subject to rules
11.4.
● 11.4 Fuel Starvation & Surge Tanks:
○ 11.4.1 Anti-Starvation: Passive in-tank solutions (e.g., Verus/Velox fuel door,
Holley HydraMat) are permitted.
○ 11.4.2 Surge Tank Allowance: Aftermarket external fuel surge tanks are
permitted, provided they are separated from the driver's compartment by a metal
firewall or sealed enclosure.
○ 11.4.3 Fuel Pumps: Secondary external lift pumps are permitted only if utilized in
conjunction with a permitted surge tank.