Programmable Delco Ignition Module

[Jayme]

Hey mate, that sounds like a good idea! what PCM does the LT-5 use? if the ignition module to PCM wiring is the same as the Delco's on our aussie commodores, then this module would hook straight up, all that would be needed is detailed info on the crank trigger setup so VL400 can try to program the trigger input code to suit.

[VL400]

VL,

Been reading w great interest re: your ignition module. Here in the States, a number of us with the
LT-5 DIS have been looking for a alternative to the unique ignition module used in that system. It's not repairable or rebuildable. Additionally, the LT-5 makes power right up to 7k and we'd like to use the individual coil setup to take advantage of that higher power peak. Some are adapting forced induction to the LT-5 and the hotter spark from the LS coils would come in handy. Any interest in working w us on this?
Super job on this. Very impressive.

Have replied to your email too, but will need to find out more info as we didnt get these in Oz. Development without a vehicle can be tricky, there is only so much that can be done/simulated on the bench. And from what you said a few months ago the big difference will be that the ECU does not control dwell, that will require many changes to the firmware as the modules here for the early Delco use timing and dwell from the ECU.

[antus]

I put a bunch of info about that pcm and ignition system (via a mirror of the old diy-efi ftp) up over here:

https://pcmhacking.net/forums/view ... =11&t=3081

I reckon it might almost 'just work'.... The delco interface looks right, so perhaps a definition for an 8+1 slot trigger might be enough.

[VL400]

Thanks antus. So from quickly reading the docos there are three (and possibly more) things that are needed to get this working..
1 - Need to still add N+1 trigger support. This is not difficult and the easiest of the 3 problems.
2 - The LT-5 DIS module handles dwell. Its on my todo list for this but requires a fair few changes - depending on the pulse length from the ECU the current dwell overlap code might just need some mods.
3 - The hardware needs to be changed to support an EI Fault Line. The 24 pin connector currently has no free pins so might need to dual purpose one for this.

[Dylan]

Just an idea I've had, possible to run a Coil On Plug set up with this module? Would look good on a 202.
Possibly the Alloytec type?

[Holden202T]

No reason you couldn't but I don't think they'd look real good sticking out the side of the motor that far ??

[Dylan]

Only ever changed one but now that I think of it they are quite long.

[Holden202T]

yeah and they stick out of a holden 6 head almost horizontal!

the LSx coils are a better option cause you can position them either on the tappet cover or on the side of the motor and use the stock leads to run to the plugs, or like I did, remote mount them and run custom leads to suit.

[Dylan]

They were my original plan (if I ever get to it) I will stick to them I think, I'm planning on mounting them on the rocker cover.

[VL400]

I have not tested the alloytec COPs, but if they are like the truck LS2 coils you will have issues while cranking with them firing erratically due to a protection mechanism for long dwell times. Something to keep in mind if you do end up wanting to run them, LS1 coils are the easiest to get working.