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Thread: Timing being pulled during WOT and dont understand how to fix

  1. #1
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    Timing being pulled during WOT and dont understand how to fix

    The truck is a 2008 Silverado that was originally a 5.3/4l60 truck. Currently it has been swapped to a 6.2/6L80

    VVT and AFM have been DELETED and I beleive i have cancelled it all out in the tune.

    the truck starts up great with the 3 bolt, larger cam and the part throttle drivability is great.

    When giving 70% of pedal or more the truck starts to hesitate and you can see MAF on the chart start to oscillate...
    you can see in the picture below that spark advance spikes to commanded then drops to about 0* of timing and it wont allow the vehicle to downshift...

    Ive tried to disable anything in torque managment that controls spark.

    The beast hesitation.PNG

    Notice CylAir also seems like a large number for what a cammed 6.2 should see...

    attached below is log and tune

    WES6.2swapWORKING.hpt
    the beast timing issue.hpl

    Thanks!

  2. #2
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    Still having the issue and cant figure it out...
    Anybody came across this issue before?

    any ideas?

    Thanks

  3. #3
    Senior Tuner SultanHassanMasTuning's Avatar
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    log PID torque management

    it seems your ETC is closing some, also under torque management tab

    disable ETC limit

    and your trans input change it to 5999 and output raise 6042

    see how that goes
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  4. #4
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    Quote Originally Posted by SultanHassanMasTuning View Post
    log PID torque management

    it seems your ETC is closing some, also under torque management tab

    disable ETC limit

    and your trans input change it to 5999 and output raise 6042

    see how that goes
    Thanks for the input. Ill log PID torque managment and go from there.
    I changed those values according to what you said. I think I might have looked some of the "Discrete shift" stuff also. I changed those back to stock settings and see where it goes from there...

    Ill update when I can do that

  5. #5
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    I tuned a cammed 5.3 truck last night that was kicking on traction control around that rpm and looked pretty similar in the logs...

    Why is the map reading about half what it should?

  6. #6
    Senior Tuner SultanHassanMasTuning's Avatar
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    ^good point
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  7. #7
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    The MAP is reading half of what it actually is due to a different MAP pid being designated to the chart. on my PID list, it is actually reading correctly... I just need to go into the chart settings and change it to MAP(SAE) and it will read correctly... weird how it is.

    But I fixed the issue. it was just need to completely delete all torque managment for some reason...

    appreciate the help!

  8. #8
    Senior Tuner SultanHassanMasTuning's Avatar
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    ^glad its working out!
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