Whats the lowest and highest psi possible, are they decent FPR's?

 

?

 

yeah they're pretty good, i wanna say 75psi but i don't think thats it

 

i wouldnt set it higher than 55psi, depending on your fuel set up ive seen them as low as 30, id put it at 40, mine was dyno tuned to 51 psi which is kind of high but right now i dont have any fuel system upgrades besides that

 

put it this way. on a GSR the stock FPR flows 52.5-53 psi w/o vaccum refrence.
with the vaccum on at idle, it sits at 42.5 as you gas it, the car adds fuel this is a dynamic setup vs when someone sets a static fuel pressure setting of 51psi. if you were smart, you would keep the fuel pressure tuned within factory spec to the setting of your choice, and adjust fuel with VAFC, etc and lean out where appropriate. running too high of a fuel pressure has consequences

 

i have a built motor. 11.5 pistons and 84.5mm bore., my psi is at 80.. is that a little high?