here is the TSA rules.
The following rule clarifications TSA "Turbo stock appearing" TR class qualifying ET 13.2
are intended to clarify some aspects of the rules that have been brought up as unclear. Little has changed from the last two years.
The TSA TR class is intended to provide a race class for 86/87 vin 7 cars that are STOCK APPEARING. It is intended that with the STOCK APPEARING requirement, innovation will develop methods that will push the performance of STOCK APPEARING cars to a level that has not been achieved in the past. In some cases such as exhaust systems where original replacements are no longer available and haven't been for quite some time we will allow "reasonable upgrades". For the sake of these rules the term "stock appearing" does NOT mean similar to, better than, improved, really close, almost identical, should have been like this, what GM really intended, more stock than stock, they made a mistake and this is how my car was shipped, etc. Clones and dealer installed aftermarket options are not allowed unless they are specifically mentioned in the rules. Since the spirit of the class is for STOCK APPEARING cars we really shouldn't have to spell things out in much detail. This means if we can SEE it and it's not how the car was delivered its not allowed. Or put another way if you have to ask if its ok------ its not!
No tools will be used for inspection beyond a light, mirror, ruler, scales and scan tool. No removal of parts or disassembly will be done in tech that requires tools. Cars are subject to re-tech at any time before or after runs as well as reweighing. Cars will be inspected and weighed after each qualifying and racing pass. Car must have option sticker on trunk lid with VIN that matches car. Each car must be represented at tech by only one person. This person does not have to be the driver or owner but the person chosen must be the only one that interacts with the RRA. Failure to obey this rule will result in disqualification.
The qualifying ET is based on the factory posted times for a GNX. With poor tires, exhaust, chip and turbo (all allowed in this class) the GNX was able to achieve 13.2 as far back as 1987.
Suspension :
Must retain all original equipment.
NO frame mods or reinforcements.
Stock wheelbase, stock unmodified control arms front and rear with black bushings in original locations.
Since all the cars didn't come with the same body bushing compliment you can have them in all locations as long as they are GM bushings.
No frame braces that didn't come on the car.
No traction bars unless the car is an original GNX and then they must be original.
Rear seat braces are ok as long as they are installed and visible only from the trunk.
8.5 inch 10 bolt GM rear with stock stamped cover unless it is an original GNX. Posi may be added to non posi cars.
Must have stock dimension and diameter sway bars front and rear with black bushings.
Stock appearing brakes, drums back (alum ok), disc front.
Any type stock appearing shocks in stock location----any color ok.
Springs must be single coil design like original stock springs.
No air bags.
Car must sit within one inch of stock ride height. This would be 8" from road surface to frame rail measured at all 4 jacking mounts.
Engine compartment
109 block with no EXTERNAL mods.
All original equipment and sensors intact-no deletions or additions that aren't supported by build tag on inside trunk lid. Original size battery in stock location with original type side terminals and battery cables.
Original type stock appearing front cover and water pump. Large capacity oil pump is ok. Stock appearing cooler lines must be in place with stock appearing adapter.
Original, stock, externally appearing manifold, throttle body (alum or silver in color).
Original appearing starter and 120A CS alternator with stock appearing fan.
Stock accessory bracket with original appearing power steering pump/pulley and AC compressor/pulley
Stock appearing black coil pack.
Grey or black spark plug wires original size/length/diameter routed in original location.
Original GM headers with heat shields intact---may be welded for repair purposes.
Original diameter one piece downpipe (2.5"max)
Original type wastegate---- may be modified to make it adjustable (ie threaded rod).
Original type solenoid (one only) must be only control for wastegate.
Stock appearing 3 bolt turbo must fit under unmodified shield mounted in stock location with stock bracket with stock GM cast inlet bell with vent intact-------no visible modifications to the turbo compressor or exhaust housing are allowed----the vent can be blocked but like everything else it must not appear from the outside to be modified.
Stock appearing MAF (AC molded with down turned plug)
OEM inlet flex hose and up pipe (up pipe can be painted silver) with no modifications (holes, tape, shortening, etc)
Stock intercooler with no external mods with stock inlets/outlets mounted with stock brackets in stock location with stock scoop (screen may be removed)
Any size injectors in 6 stock locations.
Stock appearing fuel rail
GM 8445 heads with NO external mods or logos---- installed with GM TTY bolts. Any head gaskets.
Stock appearing unmodified valve covers (must be alum or silver in appearance) installed with 1 oem style cork gasket, NO spacers. Original filler cap and tube on driver side.
Original breather and tubing on pass side.
Stock radiator tanks. Additional cores can be added but support cannot be modified.
Original underhood wiring and loom must be intact with no additions/deletions that aren't supported by option tag-----only exceptions 1-anti-theft, 2- single relay and wiring for fuel pump "hotwire" upgrade. All underhood parts must be mounted in original location and oriented as delivered from the factory.
AC may be converted to R-134 and must be operational enough to blow colder than ambient.
Powermaster with stock reservoir. Line lock and or proportioning valve may be used as long as it is not visible under the hood or have visibly modified fluid lines or any parts that extend below the lower frame line of the car. No wires or switches may be visible inside the passenger compartment.
Stock unmodified air box (no holes when installed on car) with snorkel.
NO chrome if GM didn't do it.
Hoses must be black and clamps must be original color.
No engine tiedowns.
Aftermarket engine/tranny mounts ok if they use original mounting holes and black cushions.
Stock unmodified fans in both locations-radiator and crank. Original diameter pulleys and serpentine belt.
Tranny
2004R with no visible external mods except for 2nd servo.
Stock pan and driveshaft---loop ok, any convertor or transbrake as long as it is not visible under or inside the car.
Trans cooler ok as long as it is mounted and plumbed "GNX" style
Tires/wheels
Any matching set of 15" or 16" steel or alum wheels-------must retain original bolt pattern-------front tires must be at least 215 wide ------rear tires must be 275 or less DOT radials-----NO SLICKS
Interior
Full stock appearing interior matching option codes on trunk lid. Original gauge cluster, only addition to gauges is boost (2 1/8 max dia) and it must be pillar, column or console mounted.
Stock shifter
Radio may be upgraded but must fit in stock location with no visible components/parts elsewhere.
All windows must be glass and all door windows must function as normal.
Exterior
Complete car exterior retaining original appearance as it was on the showroom floor.
All bumpers (must be original steel), fillers, panels and lights must be in place.
All body panels must be painted--- no bare metal or primer.
No signs on painted exterior of car. Any signs on windows must be smaller than 1" letters, logos <2" unless they are from state inspection or a factory window sticker.
No fiberglass or ABS body parts except for bumper fillers.
Full size OEM aluminum or steel bumper reinforcements, use of aluminum bumper reinforcements does not have to match VIN tag in trunk.
Bumper shocks must be original steel/unmodified.
No mods to sheet metal. Rear fenders may be rolled on the inside for tire clearance but they must appear untouched on the outside of car. Wheel well trim must be in place.
Repro header panels and trunk spoilers are allowed if they are fitted correctly and look original. T’s may have spoiler added.
Car may be undercoated.
Fuel system
Factory stock appearing tank, no VISIBLE additions to tank or pumps except for relay and wire upgrade
Replacement lines may be used as long as they are original size and are routed in stock location
233 or 237 regulator with no external mods.
Stock ECM with any chip, no other computers allowed.
Only one O2 and it must be installed in the original location. A second O2 bung may be installed in the Catalytic convertor for tuning but it must be plugged for qualifying and racing.
Must run gasoline for fuel, no more than 10% oxygenators------any octane ok
No fuel additives, NOS, alcohol or other chemicals allowed
Exhaust
Downpipe must be one piece and attach to stock elbow in stock fashion (ie with donut and spring loaded bolts, downpipe must route in stock location, no flexpipe.
Stock diameter one piece crossover pipe (does not have to neck down on either end)
Stock appearing full length cat must be in stock location-- must be able to pass a 50 state VISUAL inspection-----only exception is addition of O2 bung
Original design or dual mufflers but must function (muffle) and exit in BOTH stock locations, any size pipes past "Y" connection at cat. No cutouts.
Minimum weight 3,500 w/driver lbs-------spare tire and jack does not have to be in place when racing or weighing
Car must race identical as it appears in the concours with NO changes except for wheels and tires.
It would get more exposure as a separate thread.