Holley ECU to GM ECU?

Lance lance.gardiner at shaw.ca
Fri Dec 14 08:56:56 GMT 2001


Hi all!

I quick question from someone who does definitely NOT know it all! I have
[had, actually] a Holley Projection 4Di 900cfm throttle body unit on my 84
Corvette. The computer on this unit has gone to EFI heaven [or hell!], and
I'm now suspicious of the longevity of Holley ECUs. So though the Commander
950 is available, I'm not convinced it is for me.

I was thinking that with availability of the widely hacked GM ECU 1227747, I
might be able to replace the Holley ECU with the GM unit [with a suitably
matched custom PROM].

But can I use the 1227747 to drive the 4 low-impedance injectors of the
Hollet TB? I assume that if I wire them in parallel, and they have roughly
the same impedance as GM units, I will double the current for the ECU to
handle. On the other hand, it seems that the 747 has four injector drivers,
wired together in pairs. But I could certainly be wrong... So will this
work?

I haven't actually measured the impedance of the Holley injectors versus the
GM units, but will do that very soon.

If I can do this ECU conversion, I believe I could use most of the original
CFI wiring and just adapt the injectors and the ECU. Any comments?

Thanks.

Lance Gardiner.

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