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Norbie
Forums Junkie

Location:
Brisbane
Registered:
May 2002

Re: Fuel Pressure Regulators

Fri, 29 July 2005 02:39

ke382TG wrote on Fri, 29 July 2005 12:21

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.

Normal FPR's are constant rate, ie 1:1. So if the manifold pressure increases by X, the fuel pressure increases by X. This is what you will find in all OEM installations, whether turbo or atmo.

Rising-rate FPR's on the other hand have a ratio like 2:1, which means if the manifold pressure increases by X the fuel pressure increases by X * 2.

This effectively increases the fuel flow once you're on boost, which is handy if your engine management doesn't know what boost is and pulses the injectors as if there was atmospheric pressure in the manifold. As mention above the 1JZ is "boost-aware" so all you need is a plain old 1:1 regulator, as fitted from the factory.

[Updated on: Fri, 29 July 2005 02:40]

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