As title really, ie if not only the main ECU had the ability to fire an injector, but a second piggyback one was spliced in so it could too. Theyd never fire at the same time, thats for sure. I cant see it being a problem, but I suck at electrics...
injector outputs should be diode protected to block back emf anyway, but wouldn't hurt to put some decent diodes on them anyway. can't see why it wouldn't work though
Injectors are usualy low side switched. That is to say they have they have a continuous voltage on one side then they are switched on by grounding the other pin. If you connect your second ECU to the same ground side you should be OK. Do not connect both positive feeds together though. So you end up with one live feed (from the master ECU) and two switch-to-ground connections. No need for diodes.
As thought, its possible and easy, cheers 4stroke Why more info needed? The answer would be the same regardless of car/ecu/whatever. Nobody would have any idea on how to do it by giving that info as nobody would have done it.
Some injectors use a balast resistor in the live feed, which is why you should not connect the lives together just in case one ECU has a resistor and the other does not. It only applies to the positive supply which is why you use the ECU designed for the injectors to supply the power.
