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Thread: Is inj dc reported correctly in a scaled tune?

  1. #1
    Advanced Tuner angrygoat's Avatar
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    Is inj dc reported correctly in a scaled tune?

    Just curious if scaling a tune affects the reported inj dc.
    Joe
    2006 M6 GTO
    APS TT
    10.76@131

    "The goal of tuning is for the tune to run well enough you dont need any corrective mechanisms"

  2. #2
    Senior Tuner 5_Liter_Eater's Avatar
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    It is accurate. Just a function of the time the injector is open and engine RPM.
    Bill Winters

    Former owner/builder/tuner of the FarmVette
    Out of the LSx tuning game

  3. #3
    Senior Tuner DSteck's Avatar
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    IDC remains true. On E40/E38/E67 applications though, it does not take into account voltage offset, short pulse adder, or the mandatory 0.800 reset time between pulses.

    0411s include the offsets in the displayed IPW, but still don't do anything about the reset time in the calculation.

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  4. #4
    Advanced Tuner angrygoat's Avatar
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    So here is why I ask. I have a stock cube GTO I am working on with a 50% scaled tune for 110lbs/hr injectors. The car has heads, cam, and tvs2300 @ 8-9psi. The scanner is showing 96% inj dc. I have a hard time believing that even with using e85.
    Joe
    2006 M6 GTO
    APS TT
    10.76@131

    "The goal of tuning is for the tune to run well enough you dont need any corrective mechanisms"

  5. #5
    Senior Tuner 5_Liter_Eater's Avatar
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    That does seem odd but I donno, could be. I have 1k injectors and while I'm running a lot more boost and cubes I'm also spraying a lot of meth and I still saw 88% at the track recently. If yours is running really fat on E85 I don't think it's an impossibility.
    Bill Winters

    Former owner/builder/tuner of the FarmVette
    Out of the LSx tuning game

  6. #6
    Senior Tuner DSteck's Avatar
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    Did you consider that your injectors might not be what they say they are? What's your engine speed and injector pulse width when you're seeing that IDC?

    DSX Tuning - Authorized HP Tuners Dealer
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    Just say no to bull s***.
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