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Thread: 08 E38 LS7 Injector Flow base

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  1. #1
    Member Age08's Avatar
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    Default 08 E38 LS7 Injector Flow base

    Is there a custom OS that allows larger flow rates for 08 E38?
    Currently in process of installing a blower on LS7 and it came with 80lb@ Bar3 injectors,(plans to run E85 in future).
    I see the tune max out at 7.99 grams/sec for injector flow base and a 09 ZR1 tune is good for 15.99 grams/sec.

  2. #2
    Joe (Moderator) joecar's Avatar
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    If the 16 g/s OS is not compatible with your ECM, then you have to scale...

    ( you can scale IFR/STOICH_AFR to avoid having to shift-down many tables )

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    I just read about doing it that way, I was gonna try just with IAT multipler, have you tried this way before?

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    Member Age08's Avatar
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    does anyone have a stock tune for 2011 Z06 LS7?

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    Joe (Moderator) joecar's Avatar
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    You could also use the IAT multipler to scale.
    Last edited by joecar; November 13th, 2017 at 11:38 AM.

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    The IAT multiplier won't work for going over the 8g/s limit. Might as well just flash (or maybe pcm swap) a newer 2011 up cal. But you would have to find your clutch pedal type parameters to make it work....
    "All that is needed for the triumph of evil is that good men do nothing..."

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    Joe,
    what tables do you mean B4001 & B3671?
    I have tried the IAT multiply to scale but it doesn't seem to work very if at all, If I understand correctly that IAT multiplier would do this B4001 * B1213 = a number that is greater then 7.99? so the pcm would reduce injector pulse to produce correct rate.

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    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Age08 View Post
    Joe,
    what tables do you mean B4001 & B3671?
    Yes, those two tables... they scale inversely wrt each other (for example: B4001 * 0.75, B3671 / 0.75)

    I have tried the IAT multiply to scale but it doesn't seem to work very if at all, If I understand correctly that IAT multiplier would do this B4001 * B1213 = a number that is greater then 7.99? so the pcm would reduce injector pulse to produce correct rate.
    You would go B4001 * X and B1213 / X where X is your scale factor (e.g. 0.75 in the example above)...

    i.e. so now B4001 is below its 8 g/s or 16 g/s limit, but B1213 corrects it to produce the actual flowrate.
    Last edited by joecar; November 16th, 2017 at 05:19 AM.

  9. #9
    Joe (Moderator) joecar's Avatar
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    Yes.

    Please post your tune file (if you can), I want to look at the injector tables.

  10. #10
    Member Age08's Avatar
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    attached is modified IAT modifier as well as the injector flow correction from the injectors.
    E38_0005.ctz
    I just tried adjusting the stoich_afr my the % difference in IFR and the car idles not bad. The question I have isn't changing that gonna screw up the closed loop afr?

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