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How much range should I get from FPR?
Posted: Fri Jun 23, 2006 8:03 pm
by TPI 85 Blazer
With no vacuum on my fuel pressure regulator, I see about 44psi. When I apply about 15 psi of vacuum to the regulator, fuel pressure only drops to 38. Is it a big problem to not have a 1:1 relationship or will this easily tune out (the MS-II is not on the vehicle yet)?
Posted: Sat Jun 24, 2006 2:39 pm
by fscott
As long as it's consistent, you'll be able to tune around it.
Posted: Sun Jun 25, 2006 9:37 am
by Big Creek
That is a normal drop in pressure.
Todd
Posted: Sun Jun 25, 2006 1:21 pm
by TPI 85 Blazer
OK, everything I have read about FPR says that the pressure drop across the injector is supposed to be constant. I guess the only concern then would be if I can't get a steady idle. The injectors arent' oversized.
I don't know why I haven't thought to go measure the pressure on my car, with factory MPFI.
