Calculating BPC

[Calvin]

calculating the BPCs seems to be a ratio of cylinder size to injector flow. If the FPR varies FP with respect to intake vacuum, and injector flow varies with pressure, what pressure do I use to calculate new injector flow rate and thus BPC?

Let me try this again: If my FPR goes from 37-43PSI at WOT, which pressure do I use to determine injector flow?

What adjustments do I have to make for going to the 19lb/hr VIN C 3800 injectors and going to the 52PSI 00+ Gen 3 fuel rail. I am getting confused on this.

Thanks
Kurt

[MonteMonster95]

Damn I'm already confused....No speaky spanish.....j/k

[RacerX11]

Injector flow is constant. The vacuum referenced FPR drops the fuel pressure under vacuum so that the pressure across the injector is always constant. Use the 43psi for calculations.

[Calvin]

Sweet! I had a suspicion that the FPRs were designed to keep the delta P through the injector from the rail to the intake constant, but I sort of shot that idea down when I started seeing that they were available in different ratios and such.

Thanks for confirming my suspicion! This explains why everyone else's calculations ignore any lower fuel pressure numbers.

Thanks again,

Kurt