fuel pressure

[carsaval]

If i get a walbro 255 and a fuel pressure regulator, running 560cc injectors what pressure should i set it at.

 

[JDNSBR]

Every car is going to be a little different as not every set of injectors is going to flow exactly 550cc or 560cc. Everything is going to differ per vehicle. You are going to have to play a little bit but it is generally between 38 and 43.

 

[carsaval]

ok thats good cause i would probly be like hey lets turn it up to 80. they are 560cc evo injectors so hopefulyl they will flow pretty close to that but thank you that gives me a good figure for it. How do i go about figuring out how to set it.

 

[LordDigi]

... between 38 and 43 ...

Stock 2g FP is 43.6psi. I would only change this if you have some type of logger ... I see you have a SAFCII. Your best bet would be to leave your base FP @ 43.6 and tune your AFC for the injectors. This will gain you more timing over all; if you start to have knock issues because of the timing advance then I would bump your base FP down