OK, this one is definetly outside my realm...

Wiring a '730 ecm in place of the '302 ecm (going speed density instead of MAF)

The '302 has 2 injector drivers... 135 and 246 are seperate.

The '730 only has one injector driver... do I just wire the 2 together?

 

Yes and no. Both injector banks will be driven from the one injector driver. There are two pins on the '730 that tie into the one driver. Put one wire into one of the two pins, the other wire into the other pin. Pins C11 and C12 on the '730 are the injector driver output.

RBob.

 

Yes, but since the '302 has 2 injector drivers (total of 4 wires) then would I run say... the ground of both 1-3-5 and 2-4-6 into the single injector ground on the '730, and the same with the positive side? (I'm not sure what's ground/positive, so please don't take it literally, lol)

If I only hook one set of wires up, won't I only be running 1 bank of injectors?

 

Ah. I didn't realize the '302 used four wires for the injectors. Looking at the '302 pinout I would tie together the original pin C15 & D16 wires and place that into one of the '730 injector slots.

Then tie together the D14 & D15 wires and place that into the other '730 injector slot.

Wonder why they so many wires for 6 injectors? Maybe for redundancy and/or they used small gauge wires?

RBob.

 

I couldn't say... 135 are seperate from 246.

If all 6 injectors for the '730 are on one circuit, there's no way for it to run just half at a time, is there? Seems to me the '730 would fire every injector all together, while the '302 would do bank to bank....

 

Yes, the '730 is a batch fire system. All at once. This ECM was also used on the '90-'92 TPI cars running all 8 injectors from the same driver.

{edit: checking the schematics for the '302, both injector drivers are driven at the same time. So that to is a batch system. }

RBob.