Re: Updated '747 ignition info

[rr <RRauscher@nni.com>]

mike mager wrote:

> Bob,
>
> <http://www.diy-efi.org/gmecm/ecm_info/1227747/projects/747_ignition/>
>
> Thanks for the updated '747 spark control paper;  I enjoyed and am learning
> from it.
>

Your welcome. . .

>
> I am curious, why have you decided to use a spark-only ECM?
> (If there is information on this somewhere that I have missed, please steer
> me to it!)
>

The original plan was to go full efi from the beginning. But as plans
are, they changed. A gentleman of the list was wondering whether
a '747 could be set-up for spark only; without pulling a bunch of
error codes and/or going into limp. Between that and still having
a carb and carb-fuel delivery system in place, tried it, worked,
and stayed with it. (a sudden lack of time also played).

>
> >From the description of the project in the file, it appears that you intend
> to go TBI?  Would you then continue to use the '747?
>

Yes, staying with the '747. I'm installing the fuel delivery now
and the TBI is bolted on. Should have some fire in the cylinders
this weekend.

>
> I have thought about the two possibilities - scratch-building the entire
> ECM, or completely writing a new program for an existing ECM.
>

I wouldn't do either. There are complete hac's around for four
or five great pieces of hardware.

>
> Thanks,
> Mike
> ______________________________________________________

BobR.

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