Im kinda new to this site so i hope i have this in the right section.. Im posting for my service manager at the shop i work at, he has a 01 mustang Gt thats been fully built for performance but seems to have a fuel delivery or spark issue when the car reaches 4500 Rpms. Im not a mustang guy so bear with me here. Here are the mods
4.6 Dss Supermod Level 10 racing motor
kenny bell twin screw blower w/intercooler @ 9psi of boost
DSS blower cam
DSS Racing Heads
42lb injectors
Ford focus Fuel pump
K&N Cai
75mm Tb
Bassani cats & catback
Ford Racing Shorty headers
B&M 5 speed Tranny
3.73 gears w/stock rearend
Unknown Fuel Management unit
Dyno tuning & Fuel Management unit done by Anderson Motors in Clinton, IL
Codes i pulled with my Snap on scan tool are random multiple misfire after i delete that code it will return in a couple of days, Not right away... Engine appears to run ok and not be down on power it dynoed 501rwhp but when you take it up to 4500 rpms or higher it seems like it's needing more fuel and not getting it. with my scan tool the FRP(psi) is 6psi and it reads that from idle to about 4k. Now i have attempted to check fuel pressure but on the fuel lines there isnt a port to hook a guage up to. So
How do you check fuel pressure with a gauge? What should pressure be on stock 4.6? What would be Optimal pressure for a setup like above? If there is anything that you recommend checking, or can suggest i look into i would appreciate it. were trying to get the car runing to it's full potiential rather quickly for the upcomming racing season.