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Thread: which of these 2 tunes is the leaner or richer? Please look

  1. #1
    Lifetime Member mvvette97's Avatar
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    Default which of these 2 tunes is the leaner or richer? Please look

    I have these two tunes and one is supposed to be a little bit leaner than the other. The only thing differant is the injector flow rate but I'm not sure what one is what. I can't remember. Oh, don't mind the titles, I have so many tunes on my desktop I have to name then everything, haha
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  2. #2
    Lifetime Member Chalky's Avatar
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    The winter tune has a strange bump in the IFR @ 40 KPA. This table is usually linear.

    That seems to be the only difference in the two tunes.
    2015 Z06 A8

  3. #3
    Lifetime Member 5.7ute's Avatar
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    The tune with the bump in the IFR table will be leaner. This tells the PCM that the injectors flow more where raised so a smaller pulse width is necessary.

  4. #4
    Lifetime Member mvvette97's Avatar
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    Ok so the winter tune is leaner then. Am I backwards on this but shouldn't it be best to run the leaner tune in the summer since the air is hot?

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