How much boost should I be making?
Stock SCís and XR7ís made 11-12psi of boost on average. Some have
reported slightly higher boost levels. Things that can unintentionally affect
boost levels include replacing old exhaust systems and air filters. This may help
explain why several stock SCís/XR7ís notice different levels. If your particular
car is making approximately 14 to 15 psi of boost, then it likely has had a
smaller aftermarket supercharger pulley installed in place of your stock pulley.
If your car is making substantially less than 12 psi, then you may have a
vacuum leak or some other malfunction.