Right, I was thinking the other day about the above, and pondered on whether smaller injectors with a rising rate fuel pressure reg would give better results than larger injectors? I would expect that idle would be much improved doingthe former, and still being able to deliver the larger quantities of fuel when required. Does that make mapping difficult though? Will a rising rate fuel pressure reg only give you a benefit when running standard ECU rather than aftermarket? Are standard fuel rail (when I say standard I mean 20vTurbo or G60 etc etc) fuel pressure regulators rising rate anyway? IIRC you can get higher pressure ones on things like porsches etc (3.5bar as opposed to 3bar)??

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