Ignition channels

[kenthompson]

So, I'm installing the MSD DIS-4 on the car, but I need to know which channel is which.

Does anybody know if channel 1 is coil 1 and so on, as listed in the FSM?

Does it matter?

KT

[tomtom72]

I don't know if this will help. I looked in the electrical section 8A book and this is what I found:

Coil 1 = 1 yellow ckt 933
Coil 2 = 1 Dk Green ckt 934
Coil 3 = 1 Dk blue ckt 932
Coil 4 = 1 Orange ckt 926

The above are wires going from the "Distributorless Ingition Module", but where they are going to is where i get lost as I sure don't understand how to read the diagrams...sorry.

[kenthompson]

Originally Posted by tomtom72

I don't know if this will help. I looked in the electrical section 8A book and this is what I found:

Coil 1 = 1 yellow ckt 933
Coil 2 = 1 Dk Green ckt 934
Coil 3 = 1 Dk blue ckt 932
Coil 4 = 1 Orange ckt 926

The above are wires going from the "Distributorless Ingition Module", but where they are going to is where i get lost as I sure don't understand how to read the diagrams...sorry.

Right that's what I found too. Same type of thing in my corvette fuel injection book (only some of the coils to cylinders are different)

But I didn't know if coils related to channels directly in the MSD unit.

[XfireZ51]

Not sure what you mean by "channels" and I'm not familiar with MSD DIS-4,
but our ignition system is "waste spark". Pairs of cylinders are fired, ie 1-6.
The FSM will show the pairing.

[-=Jeff=-]

Originally Posted by kenthompson

So, I'm installing the MSD DIS-4 on the car, but I need to know which channel is which.

Does anybody know if channel 1 is coil 1 and so on, as listed in the FSM?

Does it matter?

KT

just looked at the User instructions for the DIS-4.. It does not seem to matter on the correlation of Channels to Coils.. BUT be sure the matching input and out put wires are used on the same coil.

So now I have to pose the question, what is the reasoning behind adding the MSD? you looking for improvement of sorts or??

[XfireZ51]

The instructions seem to indicate the MSD unit between the PCM and the coils. I am assuming in the case of the LT5 that means between the Ignition Module and the coils.
I'll second Jeff's question on the need for the MSD unit. I'm not being skeptical, just curious.

[-=Jeff=-]

Originally Posted by XfireZ51

The instructions seem to indicate the MSD unit between the PCM and the coils. I am assuming in the case of the LT5 that means between the Ignition Module and the coils.

Correct between Ignition Module and Coils

[kenthompson]

Originally Posted by -=Jeff=-

Correct between Ignition Module and Coils

And actually with the coils adaptors from MSD, no wires have to be cut in the factory loom to install the MSD unit. I can take it out any time I like.

[kenthompson]

Originally Posted by -=Jeff=-

just looked at the User instructions for the DIS-4.. It does not seem to matter on the correlation of Channels to Coils.. BUT be sure the matching input and out put wires are used on the same coil.

So now I have to pose the question, what is the reasoning behind adding the MSD? you looking for improvement of sorts or??

So the firing order wouldn't have anything to do with the channel lineup then? I guess it would depend on the circuitry in the MSD unit. If channel 1 is independant of channel 2 for the capacitive discharge then it wouldn't matter.

As far as reasoning, two words: future improvements.

[-=Jeff=-]

Originally Posted by kenthompson

And actually with the coils adaptors from MSD, no wires have to be cut in the factory loom to install the MSD unit. I can take it out any time I like.

You have the PN for that harness by chance?

Originally Posted by kenthompson

So the firing order wouldn't have anything to do with the channel lineup then? I guess it would depend on the circuitry in the MSD unit. If channel 1 is independant of channel 2 for the capacitive discharge then it wouldn't matter.

As far as reasoning, two words: future improvements.

I don't think so or it would be specifically mentioned, I think the channels are independent..

Yeah, that MSD has soem nice features to go along with it..

Please post pictures when you tackle the install..