FW: cis 3 ecu interaction

[Alan Pritchard]

OOPS, yes, I have sorted that, I have a map sensor that I plan to use in
place of the stock potentiometer. In the first instance I just want to be
able to tune the fuel side, then later go squirt'n'spark, or squirt'n'edis
(with a v10 edis module if I can find one). So the first instance I can
interface to the coil for my tach feed, then later connect to the hall
sensor...
-----Original Message-----
From:	Nate Stuart [mailto:newt at newtsplace.com] 
Sent:	14 January 2004 13:38
To:	Alan Pritchard
Subject:	Re: cis 3 ecu interaction

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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