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Thread: Stall, Cam, Supercharger, and converter lock/unlock

  1. #1
    Tuner in Training
    Join Date
    Sep 2013
    Posts
    36

    Stall, Cam, Supercharger, and converter lock/unlock

    I have an '98 A4 'vette with a SS3600 Yank converter, 228/232 .571/.573 cam, and a supercharger. All of these will affect the rotating harmonics of he crankshaft and cause false misfire detections and, ultimately, cause my converter to unlock at under 2800ish rpm. What I did to correct this was to disable misfire detection (max ECT/min ECT). However, I've been reading that a lot of people will just max out the "Min RPM" and "Medium RPM" tables and leave the "High RPM" tables alone to allow the computer to detect a misfire at higher RPMs. This sounds great, but for a '98 A4 vette the Medium RPM table ends at 3000 rpm and the high RPM tables are already maxed out from the factory. That is, except for a few cells at the 3000 rpm row, every other cell is already set to 32767 (I've verified on a couple of stock '98 A4 tunes).
    Thus, if I wanted to disable the misfire detection at 3000 below on my tune I would effectively be disabling misfire detection across all RPM ranges as misfire detection is only basically enabled from 1600-3000 rpm on the 98 A4, exactly where I'm having trouble.

    Any thoughts, suggestions?

  2. #2
    Tuner in Training
    Join Date
    Sep 2013
    Posts
    36
    Anybody?
    Why is it that the '98 LS1 only has misfire detection from basically 1600-3000 rpm? I've read several posts that say they keep the high rpm misfire detection but disable the low and mid tables. If you take this approach on a '98 A4 you effectively disable all misfire detection. Is the 98 computer so slow that the misfire detection is invalid above 3000 rpm?
    What am I missing?