Hello
Past little while iv been working on a formula libre race car for a guy.
Car makes 200ish hp its a stock ford DOHC 2.0L focus motor in it.

Has 220cc injectors a areomotive FPR and a walbro inline 255 pump.
saw his fuel pressure was set to 84psi!

I know a stock focus system runs 45PSI

now my car fully built evo 3 street tune makes 419whp I have a walbro 255 and 1000cc injectors and FPR set to 42psi.

what i dont seem to understand is how do you pick what your PSI should be set to on the FPR ... or the LPH that you need ..

could some one please clear this up for me ..

thank you