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Thread: IFR Table and Boost

  1. #1
    Lifetime Member
    Join Date
    Oct 2005

    Default IFR Table and Boost

    What value does the PCM use for IFR in boost stuations as the table only goes up to atmospheric? I'm referring to a non boost referenced sloped setup in COS3. Does it just use the last value in the table or does it extrapolate? The Mag tune that came with my Radix had a flat IFR table for my returnless non referenced system?? Although I changed this, I don't know if it would make much difference because the table does not provide for boost. It appears that the only way to compensate for the reduced IFR is through the Boost VE table(automatically with AutoVE).

    I am in the process of converting to a referenced return style fuel system and will be switching back to a flat IFR table. I assume that in this case the PCM will continue to use the single value from the table under boost conditions.

    2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
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  2. #2
    Lifetime Member mistermike's Avatar
    Join Date
    Dec 2003


    Sounds like you've pretty much got it. Boost referenced regulator / flat IFR is the simple way to go, except for paying for it, of course.
    World's First Twin Screw Pontiac GTO
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