Re: PI closed loop algorithm for 1227747 ECU?

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

> PS - As for the distributor, I'm working on that too.  It turns out that
an
> early 70's large cap GM HEI unit will fit this engine if you change the
> drive gear.  I have one with the correct gear.

Then a late small cap should also fit, and that removes the problem of a bad
rotor allowing the coil to kill the module.  If using a large cap get a low
resistance center button (MSD).  There were some small cap problems, but in
general I'd say the small ones are more trouble free.

  I've also figured out that
> the ECU-controlled ignition module from a 90 Corevette will fit in this
> distributor (with a little re-tapping of mounting holes).  As near as I
can
> tell, this module should talk to the '747 (alternatively I could mount the
> "correct" module outboard of the distributor but that would look
> messy).  The ESC and knock sensor modules are a different story.  I know
> that each set is "tuned" for the engine block application.  The aluminum
> block on my engine will have totally different characteristics from that
of
> a stock GM unit.  Is it possible to use the ECU controlled spark without a
> knock sensor (assuming one is careful about advance curves, etc).

If it doesn't set a code (43, I think is ESC), then your at least close,
remember the oem stuff is just a noise detector, and should never be
considered **safe enough** to reliabily protect your engine.
Grumpy

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org