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Rich Smith suggested someone drag out some old rule books and look up the car class rules evolution pver the years. I'll cover what seem to be the significant details in this post; I don't have all years' books.

I edited Sat AM to add more detail in the first Rallytruck class listing.

This first installment is through 1989. Here we go:

1979 - Rulebook price: $1.50 including postage and handling; add $.50 for non-SCCA members !
Open - "All street licensed 4 wheel vehicles." That's it!
Production (appendix A) - Only US standard models with no options. (Or Canadian standard models for Canucks). Current year and prior 5 years. Specific eligible cars are listed. Fuel control flow into the engine is free, but elements controlling airflow control can't be modified. A single engine oil cooler is allowed. Many of the basic areas of allowed mods are listed at this date: lighting, cooling, induction (as noted above), exhaust, electrical, gearbox, final drive, shocks, suspension, wheels and tires, brakes, clutch, suppl. accessories, coachwork, consumable items, and tolerances.

1981
Open - All street licensed 4 wheel vehicles.
Production (appendix A) - Only US standard models with no options. (Or Canadian standard models for Canucks). Current year and prior 5 years. Specific eligible cars are listed; list greatly expanded from the 1979 list, and now includes some 4WD models. No turbo- or supercharged cars allowed except if listed. LS diffs not allowed. Procedures for prod class protests greatly expanded.

1982
Open class - BIG changes here: Intent is for cars to be based on production models. (The word "homologated" pops up for the first time in the rules.) If non-homologated, must be a NADA model, no "one-off's". Fabric tops "discouraged". Engine produced by same manufacturer. Drive axles are free (allowed the 4WD Aspen to still run). Non-complying cars grandfathered in, but only can be driven in lower seeds starting in 1983. OR, can be homologated; FIA classes recognized.
Production (appendix A) - Same as 1981 except that OEM wheels are specifed (probably as a result of some of the prior year's "protest wars"). Plymouth Fire Arrow made eligible...bad news for all the other cars!

1984
Open class - Same as 1982, except the drive axles are no longer free. (I.e, RWD must stay RWD.) Grandfathering clause from 1982 dropped. Allows transfer of parts from [FIA] homologated to non-homologated cars and homologated cars can be be modifed and run per the SCCA's non-homologated rules.
Prodcution - This year saw the most extensive changes ever to the P class rules. Prod GT class created. "Assembled" or "shopmade" production cars are allowed. (Hunh?? Was this the fateful genesis of seam welded P cars??) Cage extensions to brace the suspension is allowed. Definition of allowed parts expanded to include any factory produced option (but not dealer installed options). The gerenal definitions for "Supplementary accessories" is started at this time. Entrants required to file a "Production Specification Form" prior to each event's scutineering, or be re-classified to Open. Emissions control devices can be rendered inoperative. Turbo boost is free. LS diffs still prohibited in Production, but allowed in Prod GT. Fuel cells now allowed. Suspension still has to be basically stock; no coilovers yet. Max 6" or OEM wheel widths. DOT tires only, with grooving allowed. Carpets and padding may be removed. Stock front seats MAY be replaced with "any suitable seat". Oversize pistons prohibited. Car eligibiilty lists were not in the rules this year, and were avialable from the Pro Rally Manager.

1985 (Note: 'Permanaent' car numbers could be issued for the whole year for the first time; prior to 1985, car numbers were issued at each event, per start order.)
Open - Fabric tops now prohibited.
Group A - This class added in 1985.
Production - Some changes to Production Specification From procedures. The specific prohibition of "special purpose and racing tires" is dropped but they still must be DOT. Original spring mounting still required (again no coilovers yet); Mcpherson struts addressed for the first time. CASC Production Class specs allowed; does not specify that the driver must be Canadian. (This is the first mention of "CASC" rather than "Canadian" cars.)

1986
Open - Original side and rear window glazing can now be replaced with Lexan.
Group A - No changes; controlled by FIA.
Production - Still current year and previous 5 years are allowed. Tiers must now be "street legal" (DOT "approved" is dropped). The areas that cannot be effected by supplementary accessories is made very general (like dropping specific ref's to not effecting performance of the engine and transmission) to make this as broadly applicable as possbile. AC systems can now be removed.

1989 (Some P class changes listed here may have been in '87 or '88.)
Open - Old Group N dropped. Appendix O added. MAX ADJUSTED DISPLACEMENTS: 2350 cc for 4WD, which is about 1600 cc actual for a turbo car!!! 4000 cc for 2WD. THESE DISPLACEMENTS REPRESENT A LOT LESS HP ALLOWED THAN NOW. (THE HIGH HP THAT IS THE BASIS OF A LOT OF OUR PRESENT SAFETY ISSUES, IMHO.)
Group A - Some mods from FIA group A rules are allowed for competition as SCCA Group A.
Rallytruck - Class added. Appendix T; rules laid similar to P class rules, but Rallytruck rules are vaired in some important areas from P class. Max displacemnt of 2600 cc. Min wieghts spec'd. Engine can be balanced. No oil cooler allowed. Trannie and ring&pinion must be original, but optional factroy catalog locked or LS diffs can be used. Basic spring system and shocks msut be used, but other suspension mods allowed: any sway bar can be used, buschings modified, and rear axles can be remoounted above the leaf springs, for examples. Remaing mods are similar to P class, except that tailgates must be up, and ballast locations are spec'd. NO shop manual is required.
Production - Appendix letter changed to P. Cars allowed to be up to 6 years old. "Eligible cars list" no longer kept so most all cars now eligible. Max adjusted displacement for Prod set at 2350 cc (vs. the current 2650 cc). Locked and LS diffs allowed in PGT. Still no coilover suspensions. All tire restrictions dropped, so full rally tires now allowed in P classes. Passive restraints, including airbags, must be removed. CASC P cars cannot use locked or LS diffs, as per CASC rules.

More to come when time allows,
Mark B.
 

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i cant remember but coilovers were allowed in 2001 for P+PGT, i think
 

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im on pins and needles!
 
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