HEI ignition conversion

[Raphael]

Hi people

just to let you know that a GM HEI ignition module works nicely , right in place of the stock ECU.
I just finished a test conversion, the car started immediately, I didn't even have to correct the initial timing. I still need to test drive but as far, the engine idles and revs fine.
Like some Duraspark conversion we saw in the past, it's very easy to connect 4 wires from the module to the stock harness. for ease of test and sharing, I installed the setup inside a stock Bosch enclosure. so i can connect/disconnect at will.
for a clean installation, maybe I will put the device (module + heatsink )on the firewall in place of the stock ballast, with the correct coil allowing to get rid of the resistor of course.
I chose GM module for bulletproof, compact design.

[Spittybug]

Nice! Tres bien fait!

Can you post another shot of the wire connections (which HEI contacts to which pins on the connector) so that others can do the same?

[Raphael]

here it is. no secret.

[Raphael]

PIN B - to #15 : +12v ( green wire )
PIN C - to #16 : to coil ( white/slate)
PIN G - to #7 : to pick-up coil ( inner blue wire )
PIN W - to #31d : to pick-up coil ( outer black wire )
Mounting screw - to #31 : ground
Warning ; don't forget to ground the module to frame, AND the black metal frame supporting all ECUs to correct ground.

[Spittybug]

Very nice, thanks for that. Fortunately the stock module is not that expensive and doesn't often go bad, but it's always nice to have an alternative that is mainstream.

[Raphael]

mine was turning bad slowly. it was still working ,but would miss sparks randomly, and crash passed 3000 rpm.
and here in France, we experienced a few ECU going bad, I think the electronics inside are getting old... so I did buy a new stock ECU but couldn't really trust it in the long run.
for a few $$ you add a new function, among other benefits ; self-adjusting dwell time , compared to the Bosch fixed- dwell.

[Jeff K]

mine was turning bad slowly. it was still working ,but would miss sparks randomly, and crash passed 3000 rpm.
and here in France, we experienced a few ECU going bad, I think the electronics inside are getting old... so I did buy a new stock ECU but couldn't really trust it in the long run.
for a few $$ you add a new function, among other benefits ; self-adjusting dwell time , compared to the Bosch fixed- dwell.

Great find! Thanks for sharing.
Jeff

[Bitsyncmaster]

Good work. I would hard solder the wiring. I don't trust insulated terminal crimps anymore.

[Raphael]

everything is soldered I just used rubber covers instead of shrink sleeves, over the solders

[nkemp]

Can you show how this gets wired with the correct coil and without the resistors (I always hated how they look)?

Thanks & good sluething,
Nick