GM 4 cylinder DIS

[Jurgen Hartwig]

Hi all, I am embarking on my first and hopefully not last project to use GM 
or otherwise electronics to improve my car, a '76 Porsche 912E.  Right now, 
it has a standard setup with dual Weber carbs with independent runners and a 
centrifugal advance distributor.

I eventually would like to try fuel injection, but as a primer I'd like to 
focus on ignition first, as my subject suggests.

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.

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.

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.

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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