Need help with spark map's in 747.

["Kevin Reynolds" <kereyn@gte.net>]

I'm playing with the Tunercat software and a few bins from the board trying
to learn about the basic logic the ecm uses for managing different
functions.

There are 2 spark tables listed, Main and added.
Is the adder used when in WOT mode and added to the main table for that
mode, or just there to help the transition like PE fuel is used as an accel
pump?

Does the main table comprise all the functions of what would in a mechanical
distributor be "mechanical advance"& "vacuum advance" ?

Is there any other spark tables that would be used in high vacuum(cruise)
conditions that would be more equal to the effects of a vacuum canister on a
regular mechanical GM setup, or is it all in that one main table?

Thanks,
Kevin R



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