747 meet 730, 730 meet 165

[Orin Eman]

It probably wouldn't work.  Some sensors are fed thru a resistor from
a voltage source (eg coolant).  You would end up with half the source
impedance which would affect the voltage at the sensor.
For example, when the sensors resistance is the same as the source impedance,
the voltage across it would be half that of the voltage source.
Half the source impedance and now the voltage across the sensor
would be 2/3 that of the source... quite an error.  I wouldn't expect
smoke from the ECU in this case tho'.

Some digital inputs might be OK, but you would have to reverse engineer
the input circuitry to be sure.

For the resistor fed sensor, it wouldn't be too hard to make an
op-amp plus transistor circuit to feed the second ECU.

> Has anyone any experience with running 2 ecms off the same 
> inputs?.  ie would they have enough "impedance" to share inputs?
> or would they do something strange?.  The outputs would be 
> loaded independently of each other, as far as driving any loads,
> it would all be run off a small motorcycle battery.  Was just
> going to use some resistors (like 20 ohm for the injectors),
> and hook up a ignition module with a 20 dummy load on it also.
>   If this is unknown ground can anyone give me a list of things
> that might go wrong.
>   I can almost smell the smoke now
> Bruce       Glad I scotch guarded all my Cone Shaped Hats 
>                  the other day.