Fuel psi
 

ok i have a 89 supra gt here is what i am running: t60-1, 550cc r/c injectors, walbro 255lph pump, stock intercooler, adjustable fuel pressure regulator, stock manifold, 3in exhaust, stock internals, and think stock headgasket i think the guy that had it built isnt for sure which one so my guess is stock. now what i need to know is what fuel psi do i need to run, oh i am running 9lbs boost for now want to bump it up to 16-18lbs boost. my goal is 400-450rwhp no need for anymore with my lead foot. ANY HELP WOULD BE APPRECITED ALOT. THANKS IN ADVANCE.

Hook up a wide band and figure it out the right (and safe) way. I could tell you 40psi, but every system's different and one persons best might leave you a lean spot.