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  1. #1
    Join Date
    Nov 2014
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    Ont. Canada
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    1,441

    Default DIS Ignition

    Hi Danny, Scott. We're working on a buddies car. We are putting a DIS system on it, and we are having an issue with the timing below 2200 RPM jumping around. It will jump (at the crank) 10° ahead at idle. The amount the timing jumps is consistent, but the frequency it happens is not. Once above 2200 RPM it does not jump around.
    It's on a 400 SBC. He's using the Holley 60-2 wheel, with what I believe is a Cherry sensor you recommended he use on another thread. The air gap is at .025", but the sensor is slightly off center. He's also using a EFI Connection cam sync unit: https://www.eficonnection.com/home/p...nd-bbc-engines
    We recorded a datalog as well as a System Log. We don't see any missed events in the System Log.
    My first thought was to center the sensor and reduce the air gap a little to eliminate that as a cause.
    Do you know of any other things we should be looking at? Here's a zipped copy of his Global File (V4), datalog & System Log.
    Attached Files Attached Files
    Last edited by 81 TransAm; 10-05-2016 at 08:11 AM.

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