logging/scanning timing (spark)

[Whippled 496]

Looking through the plethera of {EST.XXX.DMA} PIDs i notice that i actually have the following that represent "final Spark timing" .....and these are thier definitions as described by the EFILive glossary:

SPARKADV (the one Im using right now) ->Ignition timing spark advance for the #1 cylinder not including mechanical advance.

EST.BASE.DMA ->Ignition timing spark advance direct from the main spark map in use.
i.e High Octane, Low Octane, Closed Throttle in gear.

EST.RUN.DMA -> This is the final spark timing value after all modules have contributed.

EST.EQR.DMA ->Equivalence ratio contribution to the final ignition timing spark advance value. This value is controlled by the following Tuning Tool calibration:
{B5908} Fuel Mixture Spark Correction

So which of these would be best to log my total spark advance when tuning?

[Blacky]

SPARKADV or RUN_DMA will both give you the final spark value used to fire the plugs. They should always be very close to each other.

The others are all added or subtracted by the PCM to calculate those two values. They are included so that you can easily "discover" which table in the PCM is responsible for pulling ar adding spark when the SAPRKADV changes for some "unknown" reason.

Regards
Paul