So, after reading this thread and the previous COP thread more times than I would like to admit, I have concluded that it should be safe to attempt to wire the coils in parellel.
Here's my reasoning, and correct me if I'm wrong please. The main concern with this is that because you are firing two individual coils simultaneously the power draw would fry the PCM. The PCM doesn't provide power for the coil-pack, it comes from a fused source in the distribution box, if it's too much power you will pop the fuse. All the PCM sends is a signal to fire the coil.
My question is, does the PCM receive some kind of feedback from the coil/coil-pack when it fires?
I am just making sure I have as much information as possible before I do this conversion. I see potential issues running the system in series, or in parallel. I don't foresee an improvement large enough to warrant modification of the PCM, a wiring upgrade is about the extent of work I see being worthwhile with this mod. Afterall it really is mostly aesthetic.
you are over simplifying it and are off base here. Using a COP module in a waste spark system is not ideal. If you wire it in series, as others have done, it will work and you most likely will experience no problems. The issue with this is that in series you are cutting the voltage to each COP module. In addition, you are messing with the dwell time. I dont know the specifics of each system, but think of it this way, on a system designed for COP, you have 6 injector drivers in the ECU, each one controlling a COP. Each coil on plug requires a specific voltage and a specific dwell. If you wire 2 COP in series for one driver, you are cutting the voltage, and since you are firing one in waste spark, you may not have the appropriate dwell time. The bottom line, though, is that I have not been able to find any of the specifics for either system, there really is no way to accurate determine how much you have cut your spark output, but I can assure you that you have.
You can try wiring them in parallel, but I think you will be looking for a new ECU. Once again, you are missing the point here. It is not power
draw you are worried about, it is current
flow. It is a simple OHM's law equation. Wiring them in Parallel will cut the resistance in half, which will double the current flow. Yes, you are correct that the coil has voltage source in fuse box, but it is being grounded by the PCM, the current still will flow through the drivers and burn them out. Think of it this way, the fuse for the ignition system is ONE fuse for the entire system, you are only firing 2 Cylinders at a time, you can have enough current to fry a driver without popping a fuse.