wow. a vfaq would be awesome on this one...

I forgot to draw the littleblack box thingy thats mounted with our factory coils it gets wired on the intersection of the 12volt Galant wire and the two wires going to 1 and 3.

If you guys do this using Junk Yard parts pull the wiring harness and cut the plugs using as much wire as you can get. I cut mine about 3 inches and had to do a lot more connecting than I should have.

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A pretty well known guy here in the Rocky Mountain DSM arena did some extensive research on these setups using the Chrysler 300M coils and built several setups. It seems that the downfall was that the stock ECU could not control coil dwell, speed, and volt charge setups, causing problems with the setups over time. Don't know if that will be your experience, but keep it in mind.

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I seem to remember this. Being that the 300M/Intrepid coils weren't meant to be used in a waste-spark system they were burning out prematurely. The dwell time on the coils was greatly reduced when they were used in a waste-spark system and they were overheating and dying eventually. Not sure if the wiring was different than the way curtis has them wired up. Time will tell. Keep us posted on your results curtis!

Hmmmm..very interesting post, but someone better find out for sure about the series vs parallel thing. In series, each coil is only going to be seeing 6 volts. In parallel, the ECU will need to be sinking twice the current. Neither seems like an ideal situation to me, unless Chrysler uses 6 volt coils.

That doesn't sound right. Shouldn't the secondary coils be seeing more like 100 volts? So if we wanted to even things back out we could replace the primary coil with an appropriately sized unit, right? Or am I missing something....

You mean the Ignition transistor will the sinking twice the current. The ECU runs the transistor.

Well the car sat in the garage for a weeks around christmas then I DESTORYED YET ENOTHER GEARBOX but the coils are fine and have had zero problems from them. The driveability went up along with acceleration in traffic with out downshifing. The car pulls to redline with no spark knock at all. And also the idle improved and this is after replacing the wires just a few months before. Since the build up a few of my buddies here in town went with the same set up and also love them. I found out the Dave Buchur sets are also intrepid coils but from a different motor. They have 2 differnt six cylinders in the cars but the only differance is the mounting flange. The ones I used have an aluminum rod that runs through the boot where the ones Buchur uses have a spring in the middle. I got lucky with the ones I found because the aluminum will pass the current easier than through a spring. The dealer here in town priced them to me for 35 a piece cost and list to joe off the street was a little over 50 each. Try and find them used so you can get the plugs and also get as much wire out of the harness as possible it will make the buildup a lot easier.

It sounds like the ones you got were off of an Intrepid with a 3.5L. I think the 2.7L has coils that look like what you say Buschur's look like.

In my 7+ years in a Chrysler brand dealer I think I have replaced Maybe 4 of the COP coils. They just don't go bad.

I might have to paint some blue and try them out. I have some off of a Hemi engine that I was thinking about using for this very purpose. And the Hemi's do use waste spark, but they will still fire half as often as mine at the same rpm.

Thanks to all those who added valuable info to this post. I was able to build a COP system and it works AWSOME, the car idles a lot better with the 880cc injectors and the over all power band is much much smoother. Great job Curtis and all the others who added to this post.

I just installed my home-made kit today (GSXR coils) and it seems to be working fine. I can't say for sure if it's idling better or "rev's easier" than before, but I gave 'em hell today and the held up to everything I threw at them. I've got a lot of pictures if anybody wants some email me at [email protected] or [email protected] I'll try to post up again in a couple months and let you know how they're holding up, or if/when I have any problems.

Cory