fuel pressure regulator
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This is a discussion on fuel pressure regulator within the STi Engine Performance forums, part of the STi Technical Forum category; hey does anyone know how to install a fuel pressure regulator? do i need one? here are my mods. 06 ...

  1. #1
    Registered User speed13a's Avatar
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    fuel pressure regulator

    hey does anyone know how to install a fuel pressure regulator? do i need one? here are my mods. 06 Sti Stage 2, Just installed My GodSpeed FMIC. just wondering if i should wait to install it, and install it when i order Fuel injectors and fuel pump.

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    I'd wait till you get a larger turbo. Cobb usually has a well enough time controlling fuel on basic stage 2 setups.
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  4. #3
    Registered User speed13a's Avatar
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    just wondering. it's just laying around in my closet.

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    Moderator YBNormal07's Avatar
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    Since the stock FPR is a rising rate, with static PSI around 40 psi, the stock FPR/fuel pump combo is pretty good. There are a number of folks running rotated mount turbo setups with just a Walbro FP and no need to put in an aftermarket FPR. Since it uses a rising rate, the Walbro should raise up the static PSI, and thus, the stock FPR will still increase the fuel PSI 1 PSI for every 1 lb of boost.

    The FPR is also a bit of pain to install, and if you are going to go that route, you might as well wait until you are putting in higher flow injectors as the FPR is under the passenger side intake manifold. IMHO, I don't think it's payback is really worth the effort.

    Don't forget, that with that FMIC you'll have to tune for it. Then, if you go with the FPR, or Walbro, or FRP and Walbro, you'll need to tune for them also. Regardless of the FPR used though, it should be a rising rate type.
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