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Thread: IFR 50% scaling, double stoich method: questions on IVT

  1. #1
    Tuner
    Join Date
    Jul 2019
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    Miami, FL
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    IFR 50% scaling, double stoich method: questions on IVT

    Searched the forum and I still have it unclear: When it comes to scaling large injector data, say for example the 50% method for IFR and double stoich, I'm still confused about IVT:

    1. Do I have to half the IVT Terms (called AFR Term, for alcohol composition %, under Fuel,General,IVT Terms)
    2. Do I ALSO have to half the entire IVT Gain Gas table (under Fuel,Open Loop/Base, Open Loop Gains)


    What does each of the halving of the IVT tables actually do, and what's the effect if you don't scale these and only do HALF IFR and DOUBLE STOICH?

    PS: Using a E67 PCM as reference. Sorry if I sound like an idiot, but from all the posts I've read, it's not 100% clear still the IVT portion(s) and the why of it.
    Last edited by turabo87; 08-10-2022 at 05:08 PM.

  2. #2
    Advanced Tuner
    Join Date
    Aug 2020
    Posts
    335
    1. Yes.
    2. No.


    Google.com ->
    IVT Terms site:forum.hptuners.com
    1st result
    2nd result