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GM Gen V Virtual Torque

Practical Reflash Tuning

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Discussion and questions related to the course Practical Reflash Tuning

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Looking for some guidance on dialing in the virtual torque and idle torque tables for gen 5s. Ive done a good bit of research and cant seem to find any clear answers as to what scanner parameters match which tables, if they do at all. The issues i am having are:

1. Idle with ac on, it will sometimes idle smooth and out of nowhere will jump up a few hundred rpms, back down about 100 below target and settle on target for a few seconds and repeat. most of the time it idles perfect after startup and starts to screw up after its been driven. fine in gear, only does this in park/neutral.

2. foot off the brake in gear(no throttle) tends to slowly climb rpms and basically drives itself until about 2k.

3. will do this at different speeds and different gears: steady cruising at around 10% pedal, tip in to about 20-30% and the throttle opens, timing retards, and map shoots to about 98kpa.4. when cruising, taking foot off the pedal and letting it decel, it will jump between open and closed loop and hold around 1500rpms(like cruise control is on) and will slowly move up and down about 100rpms each way.

Any insight would be much appreciated and if anyone knows how to set up histograms to tune VT please do share. 2014 Silverado 5.3l, mild cam, ported heads, and long tubes. Tune and log are attached.

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