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ke382TG
Forums Junkie

Registered:
May 2002

Re: Fuel Pressure Regulators

Fri, 29 July 2005 02:21

Quote:

RRFPR's are used when you put a turbo on a non-turbo engine and you're too cheap to get a proper ECU.

I am quite happy to be wrong or confused (and probably am Razz

) but EFI cars have fuel pressure regulators and forced induction EFI vehicles use 1:1 rising rate regulators? So regardless of the ECU a forced induction vehicle will always have a rising rate reg. Some notes below explain a little......

This was taken from http://www.mcbrooms.com/volvo/injcalcs/injcalcs.ht m

EFI systems used in charge-air applications work under a different set of operating parameters than those found in normally aspirated systems. Not only is the ECU typically programmed to dump more fuel during wide-open-throttle (WOT) conditions, due to the need for a richer air/fuel mix under boost, but the fuel system's rail pressure must successfully counteract the elevated pressures that occur in the intake system. The latter is accomplished by means of a fuel pressure regulator. A stock fuel pressure regulator is set to increase fuel system pressure by the same amount that boost pressure increases. Thus, if a system is running 8 psi of boost, fuel rail pressure will have increased by 8 psi, but only while the system is actually experiencing this additional boost pressure. The reason for this is simple -- in order to maintain the same flow rate through the injectors, the pressure across the injector (aka the delta p) must remain the same. So, if intake pressure has increased 8 psi, then fuel system pressure must also increase by 8 psi.

My Malpassi fuel reg is rising rate 1:1 so does the job of a factory unit, I fail to see how this is bodgy?. I belive it is easy to set the baseline fuel pressure with this type of unit which is probably handy when your car is nothing like factory specs.

In Ribfeasts case though you guys are probably right, he does not need any such device if his only change is to his fuel pump.

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