Adjustable Fuel Pressure Regulators?

[JeffersonC]

Worth using an adjustable FPR on stock rail such as the Nismo or Tomei? 044 pump out back and mildly built engine.

[bobbo]

I don't think so. I'm making 427whp on a stock fuel system with 550cc injectors.

[Skym]

If want more fuel out of stock or aftermarket injectors. It's a band aid way of getting more out of injectors instead of upgrading injectors. The other reason is if running a higher boost level and the boost pressure in intake manifold prevents fuel from exiting injectors, thus making engine run lean, you then up fuel pressure to match. As far as I know, most FPR's are 1:1 (1psi of boost = 1psi of fuel pressure).

[gAWDzla]

i run a AEM FPR, also have the AEM fuel pressure gauge inside the cabin to keep track of everything. Great investment imo