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hitting 1-2 shift rev limit with predator

This is a discussion on hitting 1-2 shift rev limit with predator within the Computer & Tuning forums, part of the LSx Technical Help Section category; I have a 2000 Pontiac Trans Am auto with 3.73 gears. I want to delay the shifts points under part ...

  1. #1
    Junior Member sbarin76's Avatar
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    2000 Trans Am

    Angry hitting 1-2 shift rev limit with predator

    I have a 2000 Pontiac Trans Am auto with 3.73 gears.

    I want to delay the shifts points under part throttle as the car shifts too early for my liking.

    So I purchased the Diablo Predator U7198 tuner which allows this adjustment using the parameter UPSHIFT MPH vs TP.

    I set the UPSHIFT MPH vs TP parameter to increase by 15% and it works fine; it shifts at around 3000 rpm from 1-2 in part throttle.

    The problem I have is once I increase this parameter, the car bounces off the rev limit at WOT from 1-2.

    I dont have any transmission slippage because when I reset the UPSHIFT MPH vs TP parameter the car shifts perfectly at WOT.

    It just seems like this parameter is causing the problems and I dont know what to do.

    The RPM shift points are set at 5900 at WOT, and Upshift MPH 1-2 is set at 39. I tried lowering these to 4000 rpm and 20 mph and still same problem; it hits rev limit at WOT. Again this is only when I delay the 1-2 shift under part throttle using the UPSHIFT MPH vs TP parameter.

    Please some one help!!!
    Last edited by sbarin76; 04-23-2011 at 05:39 PM.

  2. #2
    TunedbyFrost.com Tuner Frost's Avatar
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    The car must meet the MPH requirement BEFORE the RPM requirement to shift; otherwise it'll just run to the limiter.

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