I was wondering what the timing should be on a car that has a supercharger on it running 9psi of boost thanks

 

base or total? base should be 10* but that assumes you can/have pulled total timing with some type of computer (i.e. custom chip, EMS, etc.) if you are trying to set the timing with the distributor (bad idea) start at 8* and adjust from there. the msd BTM box is another good way to pull fuel if you dont have the money for the tune. total id run about 20* to start and adjust from there