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Thread: Cammed Gen V idle issue - Help needed.

  1. #1

    Cammed Gen V idle issue - Help needed.

    I'm not sure if the logs I've captured show an accurate representation. But I have had this issues since I paid the first tuner to tune the truck after the cam. Its sounds like a back fire/ Knock to me. The computer picks it up as knock and the timing sways.

    I haven't been able to resolve this and have paid a couple of tuners and haven't had any luck.

    I have have tried some idle tuning and idle Torque but it doesn't seem to make any difference.

    Any help would be appreciated.
    Log and tune attached.

    Knock at idle.hpl
    104 - Trans full rewrite.hpt

  2. #2
    Senior Tuner SultanHassanMasTuning's Avatar
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    what are the exact mods to the car
    Last edited by SultanHassanMasTuning; 08-30-2022 at 12:27 AM.
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  3. #3
    Duplicate
    Last edited by HellKnightHicks; 08-30-2022 at 10:40 AM.

  4. #4
    2.9L whipple supercharger.
    -- smaller pulley 10psi~
    ATI Balancer
    160 Thermostat
    BTR custom Torque Blower cam.
    3200 Circle D stall
    Stainless works Exhaust.
    LT4 Injectors
    LT4 HPFP
    Lingenfelter CNC ported cylinder heads.
    103mm Nick Williams TB
    Last edited by HellKnightHicks; 08-30-2022 at 12:15 PM.

  5. #5
    It looks like TQ management is pulling a lot of timing at idle. Im not sure why or how to fix that.

  6. #6
    Senior Tuner
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    The ECU is calculating too much torque, probably from too much airmass. That is often the reason for TQ Management. Increase throttle scalar and manifold volume, reduce VVE and Virtual Torque in the idle area and see if that helps.
    [email protected]
    Owner/GM Calibrator
    Gen V Specialist - C7 Corvette, Gen6 Camaro & CTS-V3

  7. #7
    Quote Originally Posted by TriPinTaZ View Post
    The ECU is calculating too much torque, probably from too much airmass. That is often the reason for TQ Management. Increase throttle scalar and manifold volume, reduce VVE and Virtual Torque in the idle area and see if that helps.
    I reduced the Virtual VE in that area and it resolved the issue.

    Used Cylinder Airmass Gram to find the area. I had to massage it down a couple times.

    Now the idle timing stays positive for the most part.

    I generally -5 ftlbs across the cells near where It was idling then Extrapolate Coeficients.

    Flash
    Log
    Flash
    Log

    repeate as needed.

    I removed some of the other changes I had made in order to try to combat this.
    - Increased External Load
    - Modifications of Predicted and Immediate Idle Speed Control
    Last edited by HellKnightHicks; 09-21-2022 at 08:50 AM.

  8. #8
    Quote Originally Posted by HellKnightHicks View Post
    I reduced the Virtual VE in that area and it resolved the issue.

    Used Cylinder Airmass Gram to find the area. I had to massage it down a couple times.

    Now the idle timing stays positive for the most part.

    I generally -5 ftlbs across the cells near where It was idling then Extrapolate Coeficients.

    Flash
    Log
    Flash
    Log

    repeate as needed.

    I removed some of the other changes I had made in order to try to combat this.
    - Increased External Load
    - Modifications of Predicted and Immediate Idle Speed Control
    Do you mean you reduced the Virtual Torque in your idle area?

  9. #9
    Quote Originally Posted by Haans249 View Post
    Do you mean you reduced the Virtual Torque in your idle area?
    Yes