I have no idea what fuel pressure regulator to get with
walbaro 255,
660cc injectors
at 10-11psi
and no fuel management unit, this is the main thing I know I should run a piggyback of some kind but my chosen direction with this build was to do without and tune stock ecu. I should be running some kind of rising rate regulator but the ratio is over my head 1:1, 1:5, 1:10, 1:12??
Constructive criticism please, I would like to figure this out

 

the stock fpr at 1.1 is more than adequate for your needs , as is your oem ecu .

 

OEM ECU if the software support is there, is far better than any piggy back...


I ran 12psi in my 2.4L with the stock fuel pump and 440cc injectors...I only recently installed a 255 cause my stocker was dying...now I run 14psi and I'm starting to run out of injector...I could increase pressure, but I think a larger injector and lower duty cycle would be more wise

 

That's why I went with the 660's
Well we'll see of the stock FPR wants to cooperate

 

Should be more than enough. I'm running 440s on 14-15 psi with a 255, I'm still able to achieve good afrs and duty cycle.

 

should be fine
same setup on my 2.4L, and i'm hitting max pulse width above 6,700rpm and it still leans out slightly...i pulled some timing to compensate, but it's not ideal...

 

I'm only running the 4g94 2.0 with redline set at 6k. Not investing any more money until I get the 4g64

 

you're probably getting close if you were to raise the rev limit

i'm in the market for some bigger injectors...need to install my meth kit first, and play with that...