Quote:
Originally Posted by razor02097
There is a FPR on the vehicle that raises and lowers the pressure but I don't know if that will affect the calculation a lot or not?
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the purpose of the fuel pressure regulator is to keep consistent the pressure differential at any vacuum.
ex: injectors firing at WOT will be 35PSI of guage fuel pressure with 0PSI of guage manifold pressure. injectors firing at max vacuum will be ~20.3PSI with negative ~14.7PSI manifold pressure.
it's actually easier to think about in absolute pressures, but that's how it works to keeps injector flowrate consistent across all vacuum levels.
if you had a rising-rate FPR, that's a different situation, but those are worthless hack methods of tuning fuel delivery.