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Thread: FPCM has an IFR delta pressure hard limit of 63.5 lbs, but the E38 does not.

  1. #1
    Advanced Tuner
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    Apr 2016
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    328

    FPCM has an IFR delta pressure hard limit of 63.5 lbs, but the E38 does not.

    This is a Whipple'd 6.2L with 72lb Deatchwerks injectors.

    I entered the injector IFR data to the ECM with no issues all the way up to 768 kpa delta pressure, but when I try to match the FPCM's identical chart, it caps any entries to 63.5 lb/hr anywhere around a delta pressure of 220 kpa and up. Is this a problem? I wonder if the ECM chart overrides the FPCM. I do not seem to have any issues but then again I don't know if I am skewing the MAF/VVE cal due to this.

  2. #2
    Advanced Tuner
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    Feb 2020
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    Metro Detroit Area
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    Im interested in the replies here. I've noticed this too myself, curious what's said about it....

  3. #3
    Advanced Tuner
    Join Date
    Apr 2016
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    328
    Does anyone have a stock file of a supercharged Gen4, WITH the FSCM, such as a 2013 and prior CTS-V or ZL1? The tune repository has a couple of cals but it doesn't look like they included the FSCM in the read. I would like to compare one with mine regarding this topic.