The SEB has approved a new supplemental class as recommended by the STAC, to be added to Appendix A as “Supplemental
Street Touring Class R” (Roadster), for competition in 2010.
The approval comes after considerable member support to expand the ST category to include a class for modern roadsters.
While many cars are eligible, member feedback helped establish the Honda S2000 and Mazda Miata as the class’ performance
targets. Allowances will be tailored for eligible vehicles to establish performance parity.
The class will have the following requirements and restrictions:
- Two seat sports cars
- Engine displacements up to 2.8-liters
- No forced induction
Eligible vehicles will include, but are not limited to:
- All STS eligible vehicles per the requirements and restrictions, plus
- Honda S2000
- Mazda Miata
- Mazda MX-5 Miata
- Toyota MR2
- Toyota MR2 – Spyder
- BMW Z3 non-M
- BMW Z4 non-M
- Mazda RX-7 non-turbo
- Porsche Boxster
- Porsche 968 (removed)
- Porsche 944 non-turbo
- Pontiac Solstice
- Saturn Sky
Excluded vehicles due to performance potential:
- Lotus cars
Additional class notes include:
- Tire Allowances (add to 14.3):
- AWD – 225mm
- 2WD – 245mm
- Wheel Allowances (add to 14.4):
- AWD – 7.5”
- 2WD – 8.5”
- Catalytic Converters (add to 14.10.E):
- Same as ST, STS allowance.
- Limited Slip Differentials (add to 14.10.K):
- STR: Only standard LSDs allowed OR Allowance same as STX, STU
The class will run with supplemental status in 2010, meaning that no National Champion will be crowned. Should the class
show considerable interest, and meet participation requirements, it may be approved for full National status in future years.
The SEB is seeking input on the following items. Members should send any input on these items to [email protected].
1) OE LSD vs. Aftermarket LSD: All of the target vehicles are available with Limited Slip Differentials (or electronic
equivalents) as standard equipment in some optional configuration. Restricting all cars to OE limited slips would reduce
SCCA Fastrack News June 2009 Page 22
costs. That said, not all factory LSDs are equal and an argument can be made that, for reasons of parity, aftermarket
parts should be allowed.
2) Inclusion of 2006-present Mazda MX-5: Is this car appropriate given the desired performance level of the class?
http://www.scca.com/documents/Fastra...-june-solo.pdf
