CALC.POWER_RW pid from my experince gives garbled results.

There is another pid GM.TORGUECALC_DMA, if this pid provides consistant data then it can be mapped against SAE.RPM and GM.APCYL_E40_DMA in the same way GM.KR and SAE.SPARKADV.

This method can be used to monitor effects of changes made to timing on the calculated torgue map comparing before and after results, and in the same way tune optimum spark as if you where using a rolling road Dyno. Advance spark until no further increase in torgue, a few more degrees should see torgue reducing and the onset of knock, retard back a few degrees or to the mid point where max torgue was seen.

Of course you may want to use a RR to verify the results.

Also unless you have hours of Dyno time, WOT timing is all that is optimised, this method tunes the whole spark map and for street use.

Has anyone tried this?