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Thread: Throttle Closes with During WOT

  1. #1
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    Throttle Closes with During WOT

    Engine 5.3 to 6.0 swap (stock bottom)
    -JEGs cam: Camshaft 1997-2004 GM LS Series (Gen III) Lift: 0.585 inch/0.585 inch Duration @ 0.050 inch: 228?/230?Advertised Duration: 283?/286?Lobe Separation: 112?RPM Range: 2,500-6,500 RPM Camshaft
    -PAC 1218 valve Spring: Single Beehive Valve Springs Rated to .600" Lift
    -Injectors: GM #24 decapped: flow 73 to 71
    -Fuel Pump: Walbro 450 (single)
    -Externally fuel pressure regulated.

    Force Induction:
    -VS Racing 7875

    Transmission 4L60 to 4L80
    -HD2 Kit
    -Circle D 3000 Stall Converter

    Gear 3.73

    This is my first turbo build. Obviously, it is "Sloppy" inspired.

    During Foot brake (8:36:59 in scan) rpm remains below 2500 (motor feels sluggish) and will not break the tires loose. When the brakes are slightly released (to encourage tire spin, 8:37:03) the rpm flares, TPS closes to 18%, truck shift to 2nd. Then, the truck TPS starts climbing again, along with the rpm, it then shifts back down to 1st. 1st gear, to 2nd gear, and back to 1st (this one is a violent shift). This is with the throttle pedal depress at WOT the entire time. Disregard the lean condition, I did fix that. This was the only scan I did yesterday.
    It seems like the TPS is somehow limiting on WOT, only. The truck drives normally, during daily drives. But when I need to get off the line, it is embarrassing. Throttle Closes.hplTorque ManagementChanges.hpt

  2. #2
    Tuning Addict 5FDP's Avatar
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    Not sure if it'll do anything but try disabling the master enable/disable for the ETC cut off control.

    Cylinder 5 has a mean misfire too.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
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    Yes, forgot to mention that, I did fix the misfire, as well. I did two scans before dinner and didn't save the scan with the fixed misfire and fixed lean data data.

    Consider it disabled.

  4. #4
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    5DFP,

    This worked. Now, to make to two black marks, instead of one.

  5. #5
    Tuning Addict 5FDP's Avatar
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    Good deal.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.