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Thread: VCM software providing suspect data on 6L80?

  1. #1
    Tuner in Training
    Join Date
    Aug 2018
    Location
    Tampa
    Posts
    13

    VCM channel and graph data don't match on 6L80?

    VCM scanner version 4.0.12 car is 2017 Chevy SS with LSA and 6l80 and less than 1000 miles since conversion So I have to believe the trans is still good. It is in third gear and that ratio is 2.36. I let it use the generic sensors when setting parameters.


    (See slip count wrong pic)
    I am using ([4110.56]/[4221])-[4111.56] for trans slip math. That's: Trans input shaft rpm/Trans calculated gear ratio-Trans output shaft RPM = trans slip.

    What am I doing wrong?
    If you look on the attached screen shot it is showing trans slip of 790 RPM in the graph from the above parameters. But when I do the math on a calculator based on the data in the channels (at that same point) I get: 8.066 RPM. 3711.1/2.359=1573.16-1565.1=8.066.

    (see unknown data pic)
    Why the difference?
    In the pic I am using the trans slip rpm channel to feed the TS pid in the bottom graph. The graph registers 395.2 but the channel feeding that graphs parameters reads 465.5 (bottom channel). I have done nothing to the feed.

    Plus, neither of those numbers is close to the math used above which presents as 1097 rpm.

    Also can anyone tell me how the trans slip channel pid is created? Sometimes I get a direct feed of negative trans slip, that doesn't make sense to me. Old skool that would have meant exploded gears or cracked casing...
    Attached Images Attached Images
    Last edited by blkvette94; 01-03-2019 at 04:29 PM.