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Thread: What to put in IFR table with boost referenced fuel pressure?

  1. #1
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    Default What to put in IFR table with boost referenced fuel pressure?

    I am going to start tuning a S10 with a roots type blown LSX swap. It has a boost/vacuum referenced fuel system. I need to know what to put in the IFR table since it doesn't have to compesate for the fuel/vacuum any more. I am assuming that it will be a solid number based on the base fuel pressure vs. injector size. Not the normal scaled up IFR table. Is this correct? Any help would be great.

  2. #2
    Joe (Moderator) joecar's Avatar
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    That's correct, a single number for the whole IFR table...

    Engine running, disconnect boost/vacuum reference hose, measure pressure at fuel rail, then calculate:

    IFR = injector_rated_flowrate * sqrt(measured_rail_pressure / injector_rated_pressure)


    Remember to reconnect reference hose.


    More info: showthread.php?t=4821

  3. #3
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    Thanks again Joe.

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