Need help with spark map's in 747.

[rr]

First check out:

http://efi332.eng.ohio-state.edu/gmecm/projects/747_ignition/

Kevin Reynolds wrote:

> 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?
>

Not sure what they mean by added, but it could be the PE table.

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

Yes.

>
> 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?
>

There is a hiway added spark function, but it seems to be disabled
in most bins. Could try it out.

>
> Thanks,
> Kevin R
>
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BobR.


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