cis 3 ecu interaction

[Nate Stuart]

There is a load reference to the ignition module as well from the CIS
flapper potentiometer. You're going to loose this when you go to EFI, so
you will also lose your load based ignition advance/retard. There aren't
any quick and easy ways around this problem, unless you can gimmick a 0-5v
signal based on load from the MS unit(or aftermarket map sensor maybe).
Chances are getting the right load curve is gonna be a ton of guess work
and compromises. You could go back to a 4kq style ignition with the vac
advance unit on the dizzy, but you'll lose the knock sensor, and overall
better ignition map for the high compression engines the CIS e3 was
designed for (what engine is this going on again??)

Have you looked into setting up the MS unit to do spark as well? Last time
I was looking at it the Megasquirt'n'spark would have worked ok for the
audi 5 cyl engines, if I remember correctly. Especially an NA motor, the
timing accuracy isn't quite there for a wound out turbo application. Plus
theres only a couple more wires you'd have to run for the coil, the other
changes are all in the programming. You still wont have a knock sensor,
but a proper timing map and the right gas shouldn't ever need one, it's
only there for a bad/low octane tank of gas.

Later!
-Nate
'89 90tq
http://audi.newtsplace.com

Alan Pritchard said:
> Hi guys, further to my wiring diagram request from the other day, I am
looking for a bit of further information. As I am replacing my fuel
computer
> with ms, I am trying to do a load of groundwork, what, if any,
interaction goes on between the fuel computer, and ignition computer. I
presume there is
> a tach signal between the two, anything else?
>
> Best Regards,
>
> Alan Pritchard,
> Network administrator.
>
> Seaeye Marine LTD.
> +44 (0)1329 289000
> www.Seaeye.com
>
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