how far are people taking superchargers on 91? I know that SoS says that 9psi is the safe limit. I ran 11psi on my old KW kit for about a year, but that's not long enough to see the end result. seeing 8.7 psi at 8500rpm now on a CT 1200 oil fed kit on 91.

 

theres is no definite answer for this question, let ur tuner decide whats safe once the car is being tuned

 

I will tell you from experience that you CAN make 500whp on 91 but you will have to have an efficient turbo setup with a low compression motor. For a supercharger and your specs, you will be fine with 91 octane. A lot of San Diego guys with superchargers are making 360-400whp, stock motor, 91 octane, 10-12 psi.

 

I don't have a super charger but I make 442whp at 14 psi on the stock engine on 91 octane. I have seen many low compression built motors make over 500 whp at 20 or so psi on 91 octane.

 

440whp at 13.5 psi for the last 20k miles on stock motor with my turbo setup. 12-14 psi should be safe aslong as your tuner knows what he's doing.