L31 Spark retard at hi rpm & load

[MIHELA]

That's exactly how I've been tuning my truck. Otherwise it rarely goes over 3500 RPM. The 4L80E doesn't engine brake either so getting into the 30-20 kPa range is hard unless it's in a manual gear.

 

[Supercharged111]

You play with the PE timing adder or just the main map?