I was wandering through my local junkyard a while back and found a crossfire injected z28. I've heard all the puns that cfi gets like miss-fire injection, can't fire injection ect., but it got me thinking if I rigged up two 350 tbi's to work together I would have the potential to make 500 hp without buying a custom prom chip or bigger injectors. To make this system work right I'd have to splice the wires going to the injectors and the iac solenoid, but would that cause half the voltage to go to each injector/iac? If so how can I double the voltage going to the injectors and iac? Since twice the voltage would also come out of the injectors/iac could I just ground one of the tbi's to the frame so the proper voltage is sent back to the ecm, or would that cause a short in the system? I'd also have to split the manifold into 2 chambers so the map sensor would only read the airflow for half the engine, and automatically supply the correct amount of fuel to the other half. I know very little about electronics aside from how to solder, so if anyone could point me in the right direction it would be a great help.

 

The IAC motors would connect the same as the IACs on the original CFI system. The injectors could be operated in parallel, but I'm not sure if the driver in the ECM would handle four lower impedance injectors. You may have to purchase and install a separate injector driver (commercially available), then operate all the injectors in batch, just like the original CFI did with the two it used.

The TPS would be the same as the original CFI. It really shouldn't be that difficult to assemble, but I think you may have some trouble getting the 350 to breathe through the CFI intake. Then again, there is at least one here that feeds a 400 CI SBC with a CFI. You may want to follow some of his threads for ideas: Tom 400 CFI

 

I should've mentioned that I'm going to use a tbi ecm instead of the cfi ecm so I know everything's compatible. Thanks for the info.