Time Trials, Car Classing

Are you ready to drive with the SCCA Texas Region Time Trials group? We are happy to have you, and here are a few things you should know about our program:

  1. The Texas Region runs our car classing a bit different than that of the SCCA national tour Time Trials. Our event series pre-dates the current National tour ruleset, and as such, we have a different set of car classing rules. Our supplemental rules can be found here
    1. Our classing is based on the car classing used by SCCA Solo Autocross. If you know what class your car is in for Autocross, we can class your car here.
    2. Our classing is as follows:
Texas Region Time Trials Class –  Cross Reference for classing. Please refer to the SCCA Solo Rules for classing of your vehicle
 
Cam Class –  Autocross Classing
  CAM-C
  CAM-T
  CAM-S
   
Street Class 1 –   
  SS
  AS
  BS
  FS
   
Street Class – 2  
  DS
  GS
   
Street Class -3  
  CS
  ES
  HS
   
Street Modified
Class –
 
  SMF
  SM
  SSM
   
Street Prepared
Class – 1
 
  SSP
  ASP
  BSP
   
Street Prepared
Class – 2
 
  DSP
  CSP
  FSP
   
Street Touring Class 1-  
  STF
  STS
  STX
   
Street Touring
Class 2- 
 
  STR
  STU
  STP
   
Prepared Cars –  XP
  BP
  CP
  DP
  EP
  FP
Texas Region
Ultimate Class
 
  Please See Supplemental Rules Section 11.3 for Class Rules
Spec Coupe Class  
  SSC
  1. Solo Classes can be best described as the following:
    1. STREET – Modifications are extremely limited – performance shocks are allowed, you can make on aftermarket sway bar change, the exhaust can be modified after the catalytic converter and the use of any DOT – legal tires is allowed, but all tires must have a tread wear rating of 200 or above.  Wheels must remain the same size as stock, but may be substituted.
    2. STREET TOURING – Designed to accommodate cars with common, bolt-on modifications, such as different suspension parts and cold-air intakes, but no turbo additions or entire swaps. Wheels and tire size is limited and all tires must have a tread wear rating of 200 or above.
    3. STREET PREPARED – takes things a little further than Street Touring.  There are no limits on wheel or tire size, and there are several other modifications that go well beyond those in Street Touring – like the use of DOT-legal R-compound tires and aero.
    4. STREET MODIFIED allows engine swaps, the addition for forced induction and any suspension as long as it uses the same attachment points.  This is a class for the truly creative, and the cars sometimes end up with only a passing resemblance to their base.  It’s the wildest of the classes that runs on DOT-approved tires.
    5. PREPARED – you’re moving into pure racing machine territory.  Prepared cars usually have no interiors, racing slicks or may even be tube frame cars with fiberglass bodies.  Often the cars that compete here are cars from the SCCA Club Racing Production and GT categories.
    6. MODIFIED is everything from pure, purpose-built racing machinery such as formula cars and sports racers to cars that started out as production vehicles but may have different engines, heavily modified bodywork and racing slicks.
  1. SCCA Solo Classing rules can be found here.
  2. The SCCA does have a quick cheat sheet for allowed modifications per class and can be found here.
  3. Any questions you may have for Texas Region SCCA classing, contact David Powers, powersdn@gmail.com