[SALEEN961]

Has anyone ever done a coil on plug conversion on a 94-04 V6 Mustang? I've been looking into it and a waste spark COP setup can be built very easily using just new coils, plug wires and a conversion coil harness.

By firing two coils at once we could retain the factory wiring and tune, but since each coil would only fire one spark plug it would double the amount of available voltage at each spark plug. This would not be a true COP setup but it would still be far superior to the stock setup.

I was just pricing out everything to do this and it would end up costing about $350 with new coils, wiring, plug wires, and brackets. Since I'm basically stock I don't plan on doing this since there would no gain unless I was boosted and making a lot of power, but still I'm interested in whether or not this has been done before.

[ESG-642T]

Like this?

[mp4 player]

I've never seen or even heard of it being done before this. What gains would you see though? Just less likely to have spark blow out with boost or what?

[SALEEN961]

That's exactly how I pictured this setup.

Basically you would have twice the available voltage at each spark plug so you'll be able to run more boost without blowing out spark. You'll only see a worthwhile gain if you were having spark problems to begin with, but still I think it's a cool setup.

[ESG-642T]

Originally Posted by SALEEN961 That's exactly how I pictured this setup. Basically you would have twice the available voltage at each spark plug so you'll be able to run more boost without blowing out spark. You'll only see a worthwhile gain if you were having spark problems to begin with, but still I think it's a cool setup.

If I remember correctly... He had to get rid of the stock ECU to do that, what is your plan?

[SALEEN961]

There should be no reason to get rid of the stock ECU.

From the factory one coil in the coilpack fires two spark plugs, now if you have two coils wired in parallel each firing one of the two plugs that was fired by one coil you can use the stock ECU. You will need to use resistors to get the resistance back up to the factory level to avoid burning up the coil drivers, but this really isn't hard. If you have the coils and sparkplug wires this can be done with $30 of wire, coil connectors, and resistors.

Each coil will still fire twice in two crank revolutions so it will fire once on the compression stroke and again on the exhaust stroke, but this is still far better then the stock setup since each coil only fires one plug now. Keeping this as a waste spark setup greatly increases the simplicity and allows the use of the stock ECU.

Making harnesses to convert our cars to COP is actually fairly simple.