A/C spark reduction?

[DrX]

I'm logging, and feeling, spark reduction of 17-18* and up to 2 sec duration that appears to be associated with A/C clutch engagement/disengagement. I have logged all spark PIDs and the only one that is active at these times is Total Torque Control Spark Retard (GM.EST_TRQ_DMA). None of the PIDs that are supposed to contribute to this PID are active(trans torque reduction, traction control, brake torque). There is no activity on the A/C Compensation Spark PID.

Does this make sense?

[joecar]

Post log/tune files.

[DrX]

Here are 2 logs(0509- start at frame 5090, and 0510- start around frame 260) of spark PIDs(there are too many to log all at once) and a typical AutoVE log file. I didn't include A/C Comp Spark in the spark PID logs as I included it with the AutoVe log(log 0511 - see frame 2640).

[DrX]

Could this be related to the 50% scaling that has been applied to my current tune so that actual torque reduction is double the target?

[joecar]

I'm still looking at this.

Log GM.STATE00 to see if the AC command coincides with commanded spark.

[DrX]

Thanks Joe. Will do.

[DrX]

Here's a log(big) that includes GM.State00. Didn't turn the A/C on til near the end - start around frame 39700

[DrX]

I disabled B4358 and now there is no retardation of spark at all on A/C clutch engage/disengage.

[joecar]

Ah, now that I look at B4358 it has now become obvious to me

[DrX]

Still not sure why this became so aggressive and of such long duration. Possibly somehow related to scaling the tune. Hopefully disabling it doesn't hurt the A/C.