2024 TSM rules
General
• Heads-up, 4-tenths Pro tree start and Pro ladder (1vs.16, 2 vs.15, etc.)
• All safety rules are dictated by track personnel.
• All participants are subject to re-weigh and re-tech immediately after final round or at any other time and must pass weight check during qualifying and eliminations.
A courtesy weigh-in is available during class tech inspection.
Weights 2024 change
• Minimum car weight w/driver must be at least:
3200 lbs - 109 casting block or any stock production V6 buick variety
3400 lbs -V6 Buick Stage 2 blocks and TA Buick V6 block.
* WEIGHTS ARE TO BE EVALUATED DURING THE SEASON ANY MAY BE CHANGED. (Note: weights were challenged in 2022 and changed in 2024)
Chassis
• Engine/firewall must be in stock location.
• Stock wheelbase required (108.0" measured).
• Any inner fender allowed. Must have inner fenders in stock location but any type is allowed. (2024 change)
• Factory front suspension mounting locations must be used with shocks in stock location.
• Factory rear suspension mounting locations required with shocks in stock location. Coilover conversion allowed. (2019 change)
Any upper rear torque box allowed (2022 change)
• No ladder bars, wheelie bars, or coil over equipped rear suspensions.
• No quarter panel modifications except rolled inner lip.
• Mini tubs allowed (2019 change)
• Outer frame rail notching allowed. Inner frame rails remain stock.
Engine
• Any V6 Buick block allowed including 109, Stage I & II, Series II, or TA Block allowed.
• Production style cylinder heads only. ( Champion, TA, M&A or 8445 iron )
• Any cast aluminum intake and cast intake plenum allowed, no sheet metal intakes.
• Single modified stock or aftermarket throttle body any size allowed (2022 change). Single throttle plate only.
• Any stock location exhaust headers are allowed.
• Exhaust must be muffled and exit in stock location.
• Downpipe must be routed down through the stock location.
Turbo
• Single turbo only.
• Maximum size compressor wheel inducer size is 72mm.
• Maximum compressor wheel exducer size is less than 103mm.
• With the exception of the obsolete 68 turbine, any compressor or turbine housing used must be currently available for purchase.
• No sleeves, welding or cold weld epoxy on any exterior surface of the turbo compressor housing to allow a larger than legal 72mm compressor wheel to be installed is allowed.
• Any wastegate configuration is acceptable
Intercooler
• Any stock location or front mount air to air intercooler is allowed. No part of a stock location intercooler core may extend down more than 11.5” below the centerline of the crankshaft.
A front mount intercooler, except for the piping, may not extend down below the bottom of the stock located radiator support.
• No liquid intercoolers, intercooler external spray cooling, or add-on cold boxes allowed.
Engine Management & Fuel System
• Any fuel management systems allowed.
• Stock (Type I) or Type II DIS, aftermarket distributor, or aftermarket COP ignition systems are allowed.
• No Delay boxes, Throttle stops or crossover boxes allowed. Throttle blade must be foot operated.
• Gasoline fuel only (includes E85, Sunoco, VP, etc), no additives, nitrous oxide injection or M1 (2019 clarification) allowed.
• Secondary alcohol injection kit allowed, and must be introduced before top of intake manifold.
Engine Compartment
• A/C and heating equipment may be removed.
• Must have an operational alternator w/belt.
• Engine cooling fans for radiator may be mounted on either side on radiator. (2022 change)
• Radiator must be in stock location.
Transmission
• Any GM automatic transmission allowed.
• Any process of shifting transmission allowed (2019 change)
Tires
• Any diameter wheel / tire allowed
• Rear drag slicks w/sidewall designation up to and including 29.5” x 10.5”
• No "W" tires allowed
• Rear DOT street tires w/sidewall designation up to and including a 29.5” x 12.5"” (ie ET Street)
• Up to and including 295 series Drag Radial tires are allowed
• Rear tire footprint when installed on a rim and mounted on the car can not exceed a maximum of 10.6” slicks & 10.9" Drag Radial width at 10 psig checking pressure. Tires may not be shaved at the tread edge to meet the maximum tread width rule
Interior
• Full FSA interior required.
• Race seats allowed if seats are attached to rear crossbar of roll bar/cage
Protests
• There is no fee required for a visual turbo peer tech before qualifying. A $250.00 fee must accompany a turbo protest. If the protested turbo is found to be legal, the protested racer shall receive the protest fee for his trouble. If the protested racer’s turbo is found to be illegal, the protest fee will be returned to the individual(s) that filed the protest. Tech Inspectors may protest a turbo at no cost.
• There is no fee required for a visual peer tech before qualifying. A $500.00 fee must accompany other mechanical protest. If the protested car is found to be legal, the protested racer shall receive the protest fee for his trouble. If the protested racer’s car is found to be illegal, the protest fee will be returned to the individual(s) that filed the protest.
• Any entrant caught trying to deliberately break the rules will be disqualified from the class.
Definition of "Factory Stock Appearing (FSA)
A factory stock appearing part is a GM part originally delivered on a 1981 to 1987 Buick Regal, GNX, Grand National, T-Type or Turbo Regal from Buick Motor Division and is externally stock in appearance. No external welding, cold weld epoxy, puttying, etc. may be done on any FSA part unless specifically stated.
General
• Heads-up, 4-tenths Pro tree start and Pro ladder (1vs.16, 2 vs.15, etc.)
• All safety rules are dictated by track personnel.
• All participants are subject to re-weigh and re-tech immediately after final round or at any other time and must pass weight check during qualifying and eliminations.
A courtesy weigh-in is available during class tech inspection.
Weights 2024 change
• Minimum car weight w/driver must be at least:
3200 lbs - 109 casting block or any stock production V6 buick variety
3400 lbs -V6 Buick Stage 2 blocks and TA Buick V6 block.
* WEIGHTS ARE TO BE EVALUATED DURING THE SEASON ANY MAY BE CHANGED. (Note: weights were challenged in 2022 and changed in 2024)
Chassis
• Engine/firewall must be in stock location.
• Stock wheelbase required (108.0" measured).
• Any inner fender allowed. Must have inner fenders in stock location but any type is allowed. (2024 change)
• Factory front suspension mounting locations must be used with shocks in stock location.
• Factory rear suspension mounting locations required with shocks in stock location. Coilover conversion allowed. (2019 change)
Any upper rear torque box allowed (2022 change)
• No ladder bars, wheelie bars, or coil over equipped rear suspensions.
• No quarter panel modifications except rolled inner lip.
• Mini tubs allowed (2019 change)
• Outer frame rail notching allowed. Inner frame rails remain stock.
Engine
• Any V6 Buick block allowed including 109, Stage I & II, Series II, or TA Block allowed.
• Production style cylinder heads only. ( Champion, TA, M&A or 8445 iron )
• Any cast aluminum intake and cast intake plenum allowed, no sheet metal intakes.
• Single modified stock or aftermarket throttle body any size allowed (2022 change). Single throttle plate only.
• Any stock location exhaust headers are allowed.
• Exhaust must be muffled and exit in stock location.
• Downpipe must be routed down through the stock location.
Turbo
• Single turbo only.
• Maximum size compressor wheel inducer size is 72mm.
• Maximum compressor wheel exducer size is less than 103mm.
• With the exception of the obsolete 68 turbine, any compressor or turbine housing used must be currently available for purchase.
• No sleeves, welding or cold weld epoxy on any exterior surface of the turbo compressor housing to allow a larger than legal 72mm compressor wheel to be installed is allowed.
• Any wastegate configuration is acceptable
Intercooler
• Any stock location or front mount air to air intercooler is allowed. No part of a stock location intercooler core may extend down more than 11.5” below the centerline of the crankshaft.
A front mount intercooler, except for the piping, may not extend down below the bottom of the stock located radiator support.
• No liquid intercoolers, intercooler external spray cooling, or add-on cold boxes allowed.
Engine Management & Fuel System
• Any fuel management systems allowed.
• Stock (Type I) or Type II DIS, aftermarket distributor, or aftermarket COP ignition systems are allowed.
• No Delay boxes, Throttle stops or crossover boxes allowed. Throttle blade must be foot operated.
• Gasoline fuel only (includes E85, Sunoco, VP, etc), no additives, nitrous oxide injection or M1 (2019 clarification) allowed.
• Secondary alcohol injection kit allowed, and must be introduced before top of intake manifold.
Engine Compartment
• A/C and heating equipment may be removed.
• Must have an operational alternator w/belt.
• Engine cooling fans for radiator may be mounted on either side on radiator. (2022 change)
• Radiator must be in stock location.
Transmission
• Any GM automatic transmission allowed.
• Any process of shifting transmission allowed (2019 change)
Tires
• Any diameter wheel / tire allowed
• Rear drag slicks w/sidewall designation up to and including 29.5” x 10.5”
• No "W" tires allowed
• Rear DOT street tires w/sidewall designation up to and including a 29.5” x 12.5"” (ie ET Street)
• Up to and including 295 series Drag Radial tires are allowed
• Rear tire footprint when installed on a rim and mounted on the car can not exceed a maximum of 10.6” slicks & 10.9" Drag Radial width at 10 psig checking pressure. Tires may not be shaved at the tread edge to meet the maximum tread width rule
Interior
• Full FSA interior required.
• Race seats allowed if seats are attached to rear crossbar of roll bar/cage
- Aftermarket steering column system allowed (2022 change)
Protests
• There is no fee required for a visual turbo peer tech before qualifying. A $250.00 fee must accompany a turbo protest. If the protested turbo is found to be legal, the protested racer shall receive the protest fee for his trouble. If the protested racer’s turbo is found to be illegal, the protest fee will be returned to the individual(s) that filed the protest. Tech Inspectors may protest a turbo at no cost.
• There is no fee required for a visual peer tech before qualifying. A $500.00 fee must accompany other mechanical protest. If the protested car is found to be legal, the protested racer shall receive the protest fee for his trouble. If the protested racer’s car is found to be illegal, the protest fee will be returned to the individual(s) that filed the protest.
• Any entrant caught trying to deliberately break the rules will be disqualified from the class.
Definition of "Factory Stock Appearing (FSA)
A factory stock appearing part is a GM part originally delivered on a 1981 to 1987 Buick Regal, GNX, Grand National, T-Type or Turbo Regal from Buick Motor Division and is externally stock in appearance. No external welding, cold weld epoxy, puttying, etc. may be done on any FSA part unless specifically stated.
