mac 10 ECU question

[urq]

Frankly, I doubt it would be wirth the effort.  I suspect that the OXS
feedback system will not work ... and that is all you're getting if you
don't hook up the ignition stuff.  I'm not a complete expert on the internal
code, but from what I have seen I suspect the code won't really loop unless
it is getting the proper gating signal from the Hall Sender in the dizzy and
the engine timing sensors on the flywheel (at least the reference sensor).
Since you would need to be switching from the DPR to the CPR/OXS Freq valve
for mixture control, it sure seems to me that you would need to swap in the
MC's fuel distributor ... and who knows what that would do when hitched up
to an NA car ... I don't know what has transpired in the past on this, but a
mixture problem sounds like a differential pressure regulator or control
module issue to me ... and it is always worthwhile to test system and
control pressure ...

Steve Buchholz
San Jose, CA (USA)
> --
> I have been having problems with my 85 4k Quattro for about a year with it
> running way rich at idle and too lean at cruise. I have tried everything
> except swapping the ecu. I have a complete mc motor with the harness and
> ecu. I am looking at swapping the mc fuel management system (mac 10 ecu,
> fuel distributor, injectors and harness) over to the stock motor until I
put
> the turbo motor in. My question is which sensors besides O2, full throttle
> switch and Idle switch are required if I only need the fuel side of the
ecu
> and will it work with the rpm and hall sensors not connected.