Hooking up these coils

Jon k · Post by **Jon k** » Fri Jun 23, 2006 9:51 pm

I just won and received these coils:

for my inline 6 cylinder though they are from a 1996 GM Pontiac 3.1L V6.

The firing order of my car is 1 5 3 6 2 4 so I will have to ignore the text on each coil top, I think I want to pair 1 and 6, 5 and 2, and 3 and 4 for wasted spark. My question is, I already have 3 VB921s installed on my megasquirt board that I want to use as Spark A, B, and C. However, these coil packs have two spade terminals on the underside. How does this work? Also, I am not sure which terminal is positve and which is negative. I have been trying to use BMW COPs where there are 3 terminals, +12v, GND, and trigger, but these don't have that, only 2 terminals I am assuming +12v and trigger? How do I do this?

I should mention:

I want to not use the DIS or module built into these coils, I would like to trigger them without it!

MS-1 V3 MSnS-E 029Q2

Post by **jsmcortina** » Sat Jun 24, 2006 3:19 am

The primary and secondary are isolated so it shouldn't matter which is 12v and which is ground.
Wire it like a normal coil using the VB921 to drive it.

James

Jon k · Post by **Jon k** » Sat Jun 24, 2006 7:25 am

jsmcortina wrote:The primary and secondary are isolated so it shouldn't matter which is 12v and which is ground.
Wire it like a normal coil using the VB921 to drive it.

James

Interesting - and so you're saying pick one terminal and hook up 12v from fuel pump relay, and the other terminal hook up to the output trigger from the VB921? Will it matter based on spark plug leads which I hook up to +12v? Like, because there are 2 spark plug wire outputs on each coil, if I hooked it up one way vs the other, will that change which plug fires and when?

Post by **jsmcortina** » Sat Jun 24, 2006 11:04 am

Both towers fire at the same time as with any wasted spark coil. So it doesn't matter which you use.

Do you have the interconnecting base that goes with it? That would make wiring easier.
I happen to have one of those coils and found it very hard to connect at the base.

What happened with the COP then?

James

Jon k · Post by **Jon k** » Sat Jun 24, 2006 2:54 pm

jsmcortina wrote:Both towers fire at the same time as with any wasted spark coil. So it doesn't matter which you use.

Do you have the interconnecting base that goes with it? That would make wiring easier.
I happen to have one of those coils and found it very hard to connect at the base.

What happened with the COP then?

James

I have the base and the bracket from the Pontiac it came with - the base has all the dwell control stuff and what not built into it - i cut that circuitry out. I am going to wire into the paths that would be hooked to that circuitry.

The COP wasted spark didn't work out so good but I am not sure if its my #'s for crank and trigger or if the theory doesn't work. I am going to try this method as it has more people using it and once I have it going, I will swap back to Wasted COP and see if I can have at it again.