how to adjust nismo fpr?

[exode]

I'm trying not to flood my engine, I have 550s with walbro and an untuned ecu. I keep flooding it! Do I screw it in or out to reduce pressure? Thanks team!

[DrifterProdigy85]

A rule of thumb is to keep fuel pressure from 40psi-50psi so the injectors spray properly. With your 550cc injectors, your gonna need to either have the ECU ROM Tuned or get a SAFC or something similar and a wideband to adjust how much fuel the injectors are spraying. You cant do this by fuel pressure alone because the ECU Fuel Mapping isnt setup properly.

[C - ROD]

with any regulator valve (fuel pressure regulator) u adjust it by more pressure is clockwise, & less pressure is counterclockwise