OnGrid Time Attack Rules 2024
GENERAL RULES
General Rules applying to all classes. Rules may be changed or updated at any time.
1 CLASSING
Any competitor is subject to approval, and the club reserves the right to disqualify any competitor or vehicle for any reason.
Any modification to a competitor’s vehicle must be allowed within the said class and the rule book along with the CCR. If you have any questions, please email race@ongridtrack.com.
1 Driver is allowed per car.
The same car may not be used for multiple entries.
Times from vehicles not registered for OnGrid Time Attack will not be counted.
Times must be set in designated sessions.
All drivers must follow the rules found in the OnGrid CCR.
OnGrid Race Steward may re-class any vehicle if the vehicle greatly exceeds its class’s intended performance capability.
If a class has fewer than three competitors, OnGrid staff may reclassify those cars to the closest performance class at their discretion. (New for 2025)
Certain vehicles are assigned a starting base class. Please refer to the attached vehicle classing guide for details. (New for 2025)
2 CHASSIS / AERO
Low volume production cars, open wheel vehicles, club racers and race cars that are made street legal are allowed in RACE class. (BAC Mono, Ultima GTR, Factory 5 818, Radical RXC, ETC)
3 ENGINE / DRIVETRAIN
One internal combustion engine is allowed per vehicle.
Electric vehicle’s base class is TUNER.
Hybrid vehicle’s base class is RACE. (New for 2025)
4 SUSPENSION / TIRES
Any competitor’s tire must be readily available to other racers for purchase. If the tire is not readily available, the competitor is disqualified.
Top portion of the tire must fit underneath the fenders and not be viewable from directly above
5 INTERIOR / SAFETY/ MISC
4 point harness must be Anti-SubMarining (ASM). ex: Schroth Rallye 4 ASM
Vehicles equipped with 5 or 6 point harnesses must have a 4 point roll bar at minimum.
Brake lights must be fully operational in all classes. Center 3rd brake light may be removed.
Sunroof may be removed or replaced with alternate material in all classes.
OEM dash may be replaced with an alternative dash if OEM isn’t readily available. Replacement dash must be the same as OEM, but may be of alternate material.
Head and neck restraints are highly recommended for everyone.
Vehicles are recommended to have a 2.5 pound, or greater, fire extinguisher within the driver's reach or fire suppression system.
OnGrid Race Stewards may inspect competitors’ vehicles at any time to ensure vehicle complies to the rules and safety standards.
All vehicles must have a front tow hook, strap, or accessible tow point.
Tow Point = an area on your car that can be used to tow your car.
Competitors must run any and all decals required by OnGrid organizers.
6 POINTS
Drivers must compete in a minimum of 3 rounds of competition for points to count towards the season.
After every round, driver points will be given, distributed as follows:
o 1st place = 25 points
o 2nd place = 18 points
o 3rd place = 15 points
o 4th place = 12 points
o 5th place = 10 points
o 6th place = 8 points
o 7th place = 6 points
o 8th place = 4 points
o 9th place = 2 points
o 10th place = 1 point
7 SEASON PRIZES
Competition Format: The season will comprise four rounds, with no drops; all points will count towards the season standings.
Season Competitor Criteria: To qualify as a season competitor, participants must compete in at least three rounds. Additionally, there must be a minimum of five season finishers.
Tiebreaker: In the event of a tie, the winner will be determined by the most 1st place finishes. If those are equal, 2nd place finishes will be used. If still tied, 3rd place finishes will decide the outcome.
Prizes:
1st Place Prize: The winner of each of the six classes will receive a "2025 Grid Pass," providing complimentary access to any public OnGrid event in 2025.
Bonus Prize: A "2025 Regional Grid Pass" will be awarded at random to one participant per class who qualifies as a season competitor. This pass grants free entry to any 2025 public OnGrid event in the region where the Time Attack series was contested. The winner will be chosen randomly from all qualifying season competitors, ensuring that even participants who finish 5th in the season have a chance to win.
We are introducing this Bonus Prize to foster participation and ensure competitors remain motivated, regardless of their standing. This initiative aims to encourage continued involvement by offering the opportunity to win a valuable prize, irrespective of final placement.
The 2025 Grid Pass and 2025 Regional Grid Pass are non-transferrable and entitles the winner to participate in one run group of their choosing, subject to OnGrid rules, at any public OnGrid event in 2025. The Winner’s Pass may be revoked by OnGrid at any time due to failure to comply with any OnGrid rules and/or policies. This is not a coupon book.
SPORT
ENGINE / DRIVETRAIN
Engines allowed:
Naturally Aspirated: 2.0L Max
Honda K swaps are prohibited
Honda F series engines prohibited.
Rotary Engines must be N/A 2 Rotors Max
No Forced Induction
No Electric Vehicles (EV) allowed
93 octane gasoline maximum. No other alternative fuels are allowed. No fuel additives are allowed.
Nitrous is prohibited.
Dogbox and sequential transmissions are not allowed.
Drivetrain conversions are not permitted
SUSPENSION / TIRES
Maximum tire width: 235 (average if staggered)
Tires must have a UTQG Rating of 100 or higher.
SuperCar 3R, Cup 2 R, and Vitour tires are prohibited.
Toyo RR is permitted
Maximum 2-way Shocks/Struts are allowed.
Active suspension is prohibited.
Aftermarket suspension components are permitted as long as they retain OEM geometry pick-up points and roll centers.
Bushings, swaybars, end links, ball-joints, and tie rod ends are exempt from this rule
CHASSIS
No tube-frame, open wheel, or kit car vehicles allowed.
Cars must keep stock chassis with no modifications unless to add chassis bracing, ie: e46 weld-on chassis bracing. No aftermarket tubular or carbon chassis components are allowed.
No Aftermarket subframes are permitted.
The shock tower may be modified only to allow the installation of camber/caster plates, and only as required to obtain the necessary camber and caster.
AERO / BODY
Adjustable and GT style wings are prohibited. (See image below)
Aftermarket bumpers, lips, spoilers, adjustable duckbills, and non-adjustable single-piece wings allowed.
Non-OEM front bumpers may not have a built-in lip that protrudes more than 3” when viewed from above.
Canards are prohibited.
Splitters and aftermarket 3D undertrays are prohibited.
Aftermarket rear bumpers are allowed, rear bumpers may be trimmed as long as they cover the impact bar and frame rails.
Diffusers are prohibited (cosmetic rear bumper “lip” style is allowed)
Hoods, hardtops, fenders, flares, vents and widebody panels are open.
Doors must remain OEM material
Glass may be replaced with Lexan, polycarbonate, or other alternative materials.
Flat bottom floors are prohibited.
INTERIOR / SAFETY/ MISC
Weight reduction allowed.
Anything behind the driver’s seat, carpet, headliner, and radio/speakers may be fully removed. Passenger seat is required.
OE Dashboard is required, airbags may be removed.
Door panels may be replaced by alternate materials but are required unless door bars are present.
Side windows may NOT be removed unless a cage with door bars is present.
Vehicles must have headlights and taillights.
Headlights and taillights must be in working order.
SPORT+
ENGINE / DRIVETRAIN
Engines allowed:
Naturally Aspirated: 3.0L Max
Forced Induction: 1.6L Max
Turbos and Superchargers must be OEM (Updated 5/4/24)
Rotary Engines must be N/A - 3 Rotors Max
No Electric Vehicles (EV) allowed
93 octane gasoline maximum. No other alternative fuels are allowed. No fuel additives are allowed.
Nitrous is prohibited.
Dogbox and sequential transmissions are not allowed.
Drivetrain conversions are not permitted
SUSPENSION / TIRES
Maximum tire width: 255 (average if staggered)
Tires must have a UTQG Rating of 100 or higher.
SuperCar 3R, Cup 2 R, and Vitour tires are prohibited.
Toyo RR is permitted
Maximum 2-way Shocks/Struts are allowed.
Active suspension is prohibited.
Aftermarket suspension components are permitted as long as they retain OEM geometry pick-up points and roll centers.
Bushings, swaybars, end links, ball-joints, and tie rod ends are exempt from this rule
CHASSIS
No tube-frame, open wheel, or kit car vehicles allowed.
Cars must keep stock chassis with no modifications unless to add chassis bracing ie: e46 weld-on chassis bracing. No aftermarket tubular or carbon chassis components are allowed.
No Aftermarket subframes are permitted.
The shock tower may be modified only to allow the installation of camber/caster plates and only as required to obtain the necessary camber and caster.
AERO / BODY
Adjustable and GT style wings are allowed but must be 600sqin or less.
May be no more than 3” above roofline, excluding stands and endplates.
Hatchbacks and wagons are excluded from this rule.
Aftermarket bumpers, lips, spoilers, adjustable duckbills, and non-adjustable single-piece wings allowed.
Up to 2 canards per bumper are allowed, no larger than 60 sq in each.
Front splitter allowed.
Splitter must be 2D, tunnels or diffusers are not allowed.
Splitter may not protrude more than 3” when viewed from above the bumper.
Splitters may not be used with non-oem bumpers
Aftermarket rear bumpers are allowed, rear bumpers may be trimmed as long as they cover the impact bar and frame rails.
Diffusers are prohibited (cosmetic rear bumper “lip” style is allowed)
Hoods, hardtops, fenders, flares, vents and widebody panels are open.
Doors must remain OEM
Glass may be replaced with Lexan, polycarbonate, or other alternative materials.
Flat bottom floors are prohibited.
INTERIOR / SAFETY/ MISC
Weight reduction allowed.
Anything behind the driver’s seat, carpet, headliner, and radio/speakers may be fully removed. Passenger seat is required.
OE Dashboard is required, airbags may be removed.
Door panels may be replaced by alternate materials but are required unless door bars are present.
Side windows may NOT be removed unless a cage with door bars is present.
Vehicles must have headlights and taillights.
Headlights and taillights must be in working order.
TUNER
ENGINE / DRIVETRAIN
Engines allowed:
Naturally Aspirated: 3.8L Max
Forced Induction: 2.5L Max
Rotary Engines: 2 Rotor F/I Max. NA is unrestricted
Single Motor (EV) allowed
Fuel
NA: 100oct or E85 Max
F/I: 93oct Max no E85
Fuel additives that increase octane levels are not allowed
Nitrous is prohibited.
Dogbox and sequential transmissions are not allowed.
Drivetrain conversions are not permitted
Turbos are limited to 68mm compressor and 58mm turbine.
Superchargers are unrestricted.
SUSPENSION / TIRES
Maximum tire width: 275 (average if staggered)
Tires must have a UTQG Rating of 100 or higher.
SuperCar 3R, Cup 2 R, and Vitour tires are prohibited.
Toyo RR is permitted
Maximum 2-way Shocks/Struts are allowed.
Active suspension is prohibited unless OEM.
Aftermarket suspension components are permitted and do not have to retain OEM geometry.
Components must be readily available and not 1 off custom components.
CHASSIS
No tube-frame, open wheel, or kit car vehicles allowed.
Cars must keep stock chassis with no modifications unless to add chassis bracing ie: e46 weld-on chassis bracing. No aftermarket tubular or carbon chassis components are allowed.
Subframes are open.
The shock tower may be modified only to allow the installation of camber/caster plates and only as required to obtain the necessary camber and caster.
AERO / BODY
Adjustable and GT style wings are allowed.
May be no wider than car, excluding mirrors
May be no more than 5” above roofline, excluding stands and endplates
Hatchbacks and wagons are excluded from this rule.
Active aero is prohibited, unless OEM. OEM active aero may not have an air-brake feature. (New for 2025)
Aftermarket bumpers, lips, spoilers, adjustable duckbills are allowed.
Aftermarket lips and Non-OEM front bumpers may not have a built-in lip that protrudes more than 5” when viewed from above.
Up to 4 canards per bumper are allowed, no larger than 60 sq in each. (New for 2025)
Splitters are allowed.
May not protrude more than 5” when viewed from above.
Splitter can have only a pair of tunnels or diffusers.
Splitter may only extend until the centerline of the front wheels.
Splitter endplates and tire spats are allowed.
Aftermarket rear bumpers are allowed, rear bumpers may be trimmed as long as they cover the impact bar and frame rails.
Diffusers are prohibited (cosmetic rear bumper “lip” style is allowed)
Hoods, hardtops, fenders, flares, vents and widebody panels are open.
Doors must remain OEM
Glass may be replaced with Lexan, polycarbonate, or other alternative materials.
Flat bottom floors are allowed, up-to the rear wheel centerline. (New for 2025)
INTERIOR / SAFETY/ MISC
Weight reduction allowed.
Anything behind the driver’s seat, carpet, headliner, and radio/speakers may be fully removed. Passenger seat is required.
OE Dashboard is required, airbags may be removed.
Door panels may be replaced by alternate materials but are required unless door bars are present.
Side windows may NOT be removed unless a cage with door bars is present.
Vehicles must have headlights and taillights.
Headlights and taillights must be in working order.
GT
ENGINE / DRIVETRAIN
Engines allowed:
Naturally Aspirated: 6.3L Max
Forced Induction: 3.8L Max (New for 2025)
Rotary Engines: No restriction
Dual Motor (EV) allowed
Fuel
NA = No restrictions
FI 2.9L Max = Unrestricted
FI 3.0L+ = 93 oct max
Nitrous is prohibited.
Dogbox and sequential transmissions are not allowed.
Drivetrain conversions are not permitted
Turbos are unrestricted.
Superchargers are unrestricted.
SUSPENSION / TIRES
Maximum tire width: 305 (average if staggered) (New for 2025)
Tires must have a UTQG Rating of 100 or higher.
SuperCar 3R and Cup 2 R tires are prohibited.
Vitour tires and Toyo RR are permitted. (New for 2025)
Maximum 2-way Shocks/Struts are allowed.
Active suspension is prohibited unless OEM.
Aftermarket suspension components are permitted as long as they retain OEM geometry pick-up points and roll centers.
Bushings, swaybars, end links, ball-joints, and tie rod ends are exempt from this rule
CHASSIS
No tube-frame, open wheel, or kit car vehicles allowed.
Cars must keep stock chassis with no modifications unless to add chassis bracing ie: e46 weld-on chassis bracing. No aftermarket tubular or carbon chassis components are allowed.
No Aftermarket subframes are permitted.
The shock tower may be modified only to allow the installation of camber/caster plates and only as required to obtain the necessary camber and caster.
AERO / BODY
Adjustable and GT style wings are prohibited. (See image below)
Active aero is prohibited, unless OEM. OEM active aero may not have an air-brake feature. (New for 2025)
Aftermarket bumpers, lips, spoilers, adjustable duckbills, and non-adjustable single-piece wings allowed.
Non-OEM front bumpers may not have a built-in lip that protrudes more than 3” when viewed from above.
Canards are prohibited.
Splitters and aftermarket 3D undertrays are prohibited.
Aftermarket rear bumpers are allowed, rear bumpers may be trimmed as long as they cover the impact bar and frame rails.
Diffusers are prohibited (cosmetic rear bumper “lip” style is allowed)
Hoods, hardtops, fenders, flares, vents and widebody panels are open.
Doors must remain OEM material
Glass may be replaced with Lexan, polycarbonate, or other alternative materials.
Flat bottom floors are prohibited unless OEM equipped.
INTERIOR / SAFETY/ MISC
Weight reduction allowed.
Anything behind the driver’s seat, carpet, headliner, and radio/speakers may be fully removed. Passenger seat is required.
OE Dashboard is required, airbags may be removed.
Door panels may be replaced by alternate materials but are required unless door bars are present.
Side windows may NOT be removed unless a cage with door bars is present.
Vehicles must have working taillights.
GT+
ENGINE / DRIVETRAIN
Engines allowed:
No restrictions
Fuel
No restrictions
Nitrous is prohibited.
Dogbox and sequential transmissions are allowed.
Drivetrain conversions are permitted.
Turbos are unrestricted.
Superchargers are unrestricted.
SUSPENSION / TIRES
Maximum tire width: 315 (average if staggered) (New for 2025)
Tires must have a UTQG Rating of 100 or higher.
Cup 2 R, Toyo RR, SuperCar 3R, and Vitour P1 are permitted.
3+ way Shocks/Struts are allowed.
Active suspension is prohibited unless OEM.
Aftermarket suspension components are permitted and do not have to retain OEM geometry.
CHASSIS
No tube-frame, open wheel, or kit car vehicles allowed.
Cars must keep stock chassis with no modifications between A and C pillars, unless to add chassis bracing ie: e46 weld-on chassis bracing.
Transmission tunnels may be modified to accommodate transmission swaps.
Subframes are open.
The shock tower may be modified, but geometry must remain OEM.
AERO / BODY
Adjustable and GT style wings are unrestricted. (New for 2025)
Aftermarket bumpers, lips, spoilers, adjustable duckbills are allowed.
Aftermarket lips and Non-OEM front bumpers may not have a built-in lip that protrudes more than 10” when viewed from above. (New for 2025)
Up to 4 canards per bumper are allowed, no larger than 75 sq in each.
Active aero is prohibited, unless OEM. OEM active aero may not have an air-brake feature. (New for 2025)
Splitters are allowed.
May not protrude more than 10” when viewed from above. (New for 2025)
Splitter may only extend until the firewall. (New for 2025)
Splitter tunnels, endplates and tire spats are allowed.
Aftermarket rear bumpers are allowed, rear bumpers may be trimmed as long as they cover the impact bar and frame rails.
Diffusers are open.
Hoods, hardtops, doors, fenders, flares, vents and widebody panels are open.
Glass may be replaced with Lexan, polycarbonate, or other alternative materials.
Flat bottom floors are allowed. (New for 2025)
INTERIOR / SAFETY/ MISC
Side impact bars may NOT be removed unless a cage with door bars is present.
Vehicles must have working taillights.
Race
CHASSIS / AERO
No Restrictions
ENGINE / DRIVETRAIN
No Restrictions
SUSPENSION / TIRES
No Restrictions
INTERIOR / MISC
Door impact bar may be removed if the cage has door bars.