I recently put a walbro 450 e85 fuel pump in my 33 gtst, i hooked a fuel pressure gauge up after to check everything was still alright and found the pressure at vacuum was 3.5 bar. It has an adjustable regulator on it which looks similar to the nismo ones.
The car was tuned a few years ago at unigroup before i owned it with the basics pfc, 12psi, full exhaust, front mount, bosch 040.
With the pfc hand controller showing 88-90% duty cycle on the injectors at the top end.
So my question is, could the fuel pressure have been bumped up when it was being tuned or is the walbro flowing to much fuel for the reg to keep up with?
There has been a few thread saying it should be fine with it. Has anyone installed one and checked the pressure afterwards?
And will it be fine running at that pressure? will the current tune possible be affected if i do drop the pressure down or should i leave it how it is?
cheers