Preliminary CRB Minutes/Tech Bulletin - November

[mossaidis]

STL is 13 lbs per 1 whp, right? Add in moderate aero and minor suspension upgrades not available in IT, what else does STL have over IT in terms of mods?

[Greg Amy]

STL is 13 lbs per 1 whp, right? Add in moderate aero and minor suspension upgrades not available in IT, what else does STL have over IT in terms of mods?

I'd have to give it a line-by-line rethink, but from memory the general differences are Improved Touring prep, plus:

Engine
- Possibly more compression (11:1 max)
- Possibly more cam (.425 valve lift max, which is what the GSR has stock intake)
- Alternate valve springs/retainers
- Alternate injectors
- IT head prep (e.g., port matching within 1")
- Lightweight flywheel
- No intake restriction
- Next year "ignition is free"

Transmissions
- Alternate transmissions allowed, same manufacturer

Suspension
- Open shocks, stock mounting points (i.e., remote reservoir, et cetera)

Wheels/Tires
- 17x7 max

Aero
- Same front air dam rules
- 48" rear wing allowed
- Can block out radiator openings

Body
- Can remove washer bottle
- Lighter weights
- 5" ride height
- Alternate material hood/trunk/hatch
- Polycarbonate "glass"
- Can remove wiper systems, except for driver wiper
- Can remove unnecessary wiring
- Can remove unnecessary trim, seals, brackets, etc
- Still require stock dashboard.
- Can relocate battery
- Can remove headlights next year and replace with plate
- Can remove factory door bars with "NASCAR bars" next year

Safety
- No limit to cage mounting points
- Same fuel cell rules as LP Prod; i.e., if your tank is in the center of the car, cell not needed.
- Need only a handheld fire extinguisher next year