GM ignition module spex

[rr]

I don't have the specs that you are asking about. However, can always
use a currently available ECM for ignition control:

http://www.diy-efi.org/gmecm/ecm_info/1227747/projects/747_ignition

BobR.


Darrell N. wrote:

> Gentlemen:
>
> I am considering building a micro controlled ignition system to replace
> the stock HEI in my 81 Z28.  What I propose to do is swap the standard
> 4 pin module for a 5 or 7 pin module, add a MAP, knock,  (and possibly
> other) sensors and a 68HC11 MCU to control ignition timing.
>
> I know the 5 pin module uses the stock mechanical and vacuum
> advance, and simply adds a retard capability in conjunction with a
> knock sensor.  The 7 pin adds full control over the advance curve
> without mechanical or vacuum advance.  The 5 pin would be a good
> starting point, and as my software progresses I could go to the full 7 pin
> implementation.
>
> What I need is detailed spex on the control signals for the module.  I
> need to know electrical signal specifications (voltages, drive capability,
> etc), a description of each signal and what it does,  and a general
> overview of exactly how the system processes the signals from the
> module.  If anyone can point me at relevant documentation or has
> experience with this type of conversion, please let me know.  A web
> search got me no detailed data on this subject.
>
> darrell n
> Calgary, Alberta, Canada
> ----------------------------------------------------------------------------

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