Quote:
Originally Posted by burnsauto
While we are on the discussion of adjustable fpr's..
Do I even really need one? What situation makes me need to replace the OEM one? I loosely understand that you can kind of "cheat" smaller injectors into thinking they are larger ones by bumping up the pressure differential between the fuel pressure and the manifold pressure, but if I'm already running large enough injectors, do I really need to bump up the pressure?
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with your stock injectors, yes you can eek out a bit more fuel... but basically youre just making things richer by adding more fuel pressure and this will max out the injectors fairly quick. i would HIGHLY recommend hooking up NISTUNE to your car if you choose to go this route and monitor what your injector duty cycle is for the fuel pressure range you choose to run versus how much boost you are pushing.
stock SR redtop/blacktop injectors are really only good for around 12psi of boost on an S15 Spec R T28. anything passed that and youre pushing 100%+ (which is bad thing). the SR ECU is already tuned very rich in high end from the factory as it is (this was to prevent fuel starvation in higher RPMs, but also makes for less power).
fuel pressure passed stock setup really boils down to your tuning and fuel setup. im not 100% sure as to when you would need to really start bumping up fuel pressure... im sure more experienced members on Zilvia can answer this. but if youre running an aftermarket high pressure fuel pump, it is advised to get an aftermarket adjustable unit WITH GAUGE. on my walbro and stock FPR, my base fuel pressure was around 48-50psi at idle. shouldnt be anything more than 40psi (especially on a fairly stock setup)