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Thread: Fuel head pressure modifiers?

  1. #1
    Senior Tuner
    Join Date
    Nov 2002
    Location
    Central Florida
    Posts
    2,503

    Fuel head pressure modifiers?

    Having just done the hotwire kit upgrade, and seeing
    almost no improvement in fuel fade, I am thinking it
    wants either a better regulator / return system, or
    a better model of fuel pressure than "58PSI". I think
    about a 4-5% short fuel delivery error can come from
    this degree of pressure fade (stock 58 -> 52, hotwire
    59 -> 54PSI).

    Now I wonders to meself, whether some model of
    real fuel pressure vs environmental factors, might be
    buried in the code and simply not made available to
    us? Certainly the plumbing losses are calculable from
    fuel delivery and mechanical knowledge. But are they?

    I would like to be able to bend the head pressure from
    59PSI idle, to 54PSI WOT, according to data I can gather.

    Or maybe I just fake the IFR table to incorporate what
    I know about lower-vacuum line pressure. But I don't like
    hokey.

    Anybody know if it's a possibility that there exists (and
    we could get at) a fuel rail pressure model?

  2. #2
    in the new E38/67 code it exists, in the LS1 code unfortunately no.
    I count sheep in hex...