Hi,
I’m seeking some clarification on the eligibility of Porsches equipped with PASM (Porsche Active Stability Management) being allowed to run in SS street stock classes at Autocross events. Does anyone know if they are or do they have to run in the next class?
As PASM lowers the ride height by 10mm when switched on, and has stiffer spring rates than the standard steel-sprung suspension, my interpretations of the rules are that they would not be allowed. Please correct me if I am wrong. I've included below the information I have used from the Zone 8 Rules, and from Porsche in order to gain my opinion.
Incidentally my car doesn't have PASM, hence my interest.
Thanks,
Hassan
1. STREET STOCK CLASSES (0-2 Points)
Any car having 0-2 penalty points inclusively (as determined in Section III)
except that the following modifications are not allowed in Street Stock:
a. Modification or Removal of catalytic converter
b. Modification or replacement of factory airbox or filter to increase
flow
c. Headers
d. Any non-stock suspension improvement (i.e.: shocks, springs, torsion
bars, etc)
e. Aftermarket Mass airflow kits
f. DME chips - in some cases modification to require 100+ octane fuel
g. Lightweight flywheels
h. Removal of weight, and/or redistribution of weight (other than for
safety reasons)
i. Any change which makes the car not street-legal in the state which it
is registered
j. Any tire with a treadwear rating less than 140 (even if delivered as
stock factory or OEM equipment)
“Stock” is intended to be defined as US-specification base model Porsches. Most
equipment available on a “Stock” car is not penalized. However, any equipment on the
following points list is assessed penalty points. This typically is equipment considered to
improve or enhance performance. “Non-stock” equipment includes both factory optional
equipment and aftermarket products.
Cayman Spring Rates:
Front Spring Struts
Basic chassis Spring Rate 27 N/mm ~> 154 lb/in
PASM chassis Spring Rate 33 N/mm ~> 188 lb/in
Rear Spring Struts
Basic chassis Spring Rate 40 N/mm ~> 228 lb/in
PASM chassis Spring Rate 46 N/mm ~> 263 lb/in