Re: GM 4 cylinder DIS

["nacelp" <nacelp@bright.net>]

> What I would like to do is use the Direct Ignition Module from a select 4
> cylinder GM vehicle and use it with my engine.  However, while this
handles
> starting and firing, it does not address ignition advance.  From what I
have
> seen, the module defers ignition advance to the ECM when an RPM is reached
> or reference is detected.  My background currently does not allow me to
> modify ECMs to get my desired advance curve, so what I am hoping to do is
> use a  microcontroller to handle the advance calculations.

For all the work to do that it would be alot easier in my book to just do
the ecm work, for ignition control.
If you look at some of the timing maps (yes you'd have to download the zip
archives and hunt), but you'll see that it would take a TON of work to get
the same curves with anything else.

> I have been following a few threads and notice that the equipment to
modify
> EEPROMS is several hundred dollars, and right now I want to keep costs
down
> to figure out if DIYEFI is my cup of tea.

Slightly over a hundred, and with shopping right at.
Get a Needhams's and be done with it.  You probably could get most of you
money back out of it from someone on the list if you quit.

> I haven't visited the junkyards locally yet.  Unfortunately, we don't have
> U-Pull-It yards, so I have to tell the fellows exactly what I want.  I
> searched a few online parts houses and have found the Chevy Cavalier has
an
> ignition module.  Do you guys know of other models that might work?  I
> believe the 2.0L and 2.5L four cylinder cars have the DIS system I need.
If
> anyone has a complete setup for sale, let me know.
>
> Do you guys think I am heading in a good direction?  I realize I could
just
> rip the ECM and use it together, but I am not prepared to handle FI and
DIS
> now.  I am still learning a lot.

You can do, just an ignition only ecm.   Then add the Fuel to it later
Grumpy

Hold off doing anything till your really sure of what you want to do.

> Any comments would be greatly appreciated.  I plan on visiting some yards
> tomorrow.  Hopefully I will find a pot of gold or at least some cool new
> parts for my car.
> Regards
> Jay


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