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Thread: Injector pulse width

  1. #1
    Lifetime Member Bruce Melton's Avatar
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    Default Injector pulse width

    I am fighting to run my SVO 42s at idle and low RPM. Am using RHS IFR which seems to be ok except I go to way lean ~16-18 and worse"lean" (PLX) if it idles more more than 15 seconds. Can't seem to ever give it enough VE at idle. Still fooling with MAF but:
    My min pulse width is set stock to 1.26ms and I see from log data a min of .305. Is that as obvious as the injector is going sub allowed PW and starving the cyl?
    If so what would you do?
    I am thinking of opening up IFR down low or reducing min pulse width.
    As always, seeking good direction,
    Thanks
    Bruce

    2000 C5 Coupe, 6M, Callies/Mahle stroked LS7 (441), Blackwing, Halltech, LS3 intake, 90mm Shaner TB, ported L92 heads, FAST 50# inj, not too much cam, Kooks 1 7/8" headers , 3" catless mid pipes, Z TIs, track suspension, , 3:90 rear, EFI V2, LM-2, etc.
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  2. #2

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    I think the B4003 and B4004 should be reduced. I usually reduce it by 50%. The larger injectors are a bit lazy at low pulse widths I think due to the size of the windings and weight that physically needs to be pulsed. Grab a set of 96 lbs'ers. They feel like a roll of quarters!

    Good topic that can use some more views.

    Howard

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  3. #3
    Lifetime Member TAQuickness's Avatar
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    Bruce - I've found my SVO42's don't give a reliable squirt below 1.79xxx MS. I usually hit this condition during non-DFCO decel. I ended up setting the lower injector pulse limit's around this time and adding about .1 ms for a low pulse width.

    Now instead of dangerously lean, I'm a little fat in those areas.


  4. #4
    Lifetime Member Bruce Melton's Avatar
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    Click image for larger version. 

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    I tried to lay out the stock values above which are the ones I am using-
    Could you be more specific?
    Thanks,

    2000 C5 Coupe, 6M, Callies/Mahle stroked LS7 (441), Blackwing, Halltech, LS3 intake, 90mm Shaner TB, ported L92 heads, FAST 50# inj, not too much cam, Kooks 1 7/8" headers , 3" catless mid pipes, Z TIs, track suspension, , 3:90 rear, EFI V2, LM-2, etc.
    PowrMax Performance

    100 mm PowrMAF

    LM-2 EFILIve package with TAQ -sLM2 V-2 serial cable> Package deals

  5. #5
    Lifetime Member TAQuickness's Avatar
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    Default

    pm sent


  6. #6
    Lifetime Member SSpdDmon's Avatar
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    Quote Originally Posted by TAQuickness
    pm sent
    Can u forward this pm to me too? I've got some 30's that I'll be dialing soon...

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