I have a general fuel pressure question. One of my cars (not an Evo) idling is 45-50 psi. WOT it is going to 22 psi towards redline, this car is on E85 and the A/F's are still in check 11.6-11.8 Is this something concerning or as long as the A/F's are good its not a huge deal.

Note this car has a supercharger on it and runs 17 psi.

 

For every 1psi of boost your fuel pressure should raise also by the same 1psi from the static pressure. If the car has an adjustable regulator, remove the vacuum hose, cap, and then set the fuel pressure; this is referred to as static pressure.