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Thread: ld9 turbo timing and tuning

  1. #1
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    Sep 2013
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    ld9 turbo timing and tuning

    hello alll i am currently having some trouble tuning my car i have a 2000 chevy cavalier ld9 2.4l turbo it has good lowend torque
    but toward higher rpm it feels like it stops pulling.. this happens above 5 psi boost. i am tuning with the alpha n computer if this doesnt work is there
    any way i can switch to the speed density tune ?? or the gm reflash
    t28 turbo
    36lb injectors
    Last edited by gsanche7; 09-25-2013 at 09:31 AM.

  2. #2
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    Tune
    Log
    and your Config
    What WideBand are you running?
    Both Options can be done.

  3. #3
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    i am running a aem wideband here is my tune and the last recorded log
    Attached Files Attached Files

  4. #4
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    I don't see your WB being logged?

    Use this config.
    Attached Files Attached Files

  5. #5
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    i dont have the wide band connected to the pcm unfortunatly but what can u tell me about my tune without it?

  6. #6
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    Not much.
    You need to log specific items and do long smooth runs.
    Erratic stabbing of the throttle is not going to get any accurate results.
    Do you have pro or standard Hpt?
    Wideband is a tuning tool, with out it hooked up to HPT it is really just a useless show piece in my opinion.

  7. #7
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    i have hpt standard

  8. #8
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    You are going to want to tap into Connect C1 Terminal 49 to PCM which is the AC pressure sensor.
    Install a switch in that ckt to input your AEM WB signal.
    Do a search on forum to get more info on that.

  9. #9
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    Sep 2013
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    thank you will do this asap hopefully after you will still be able to help