GM LT1 to AMC setup

[Six_Shooter]

The MSD ignition can be retained, it may just get triggered differently than you might be thinking now.

Most of the time the points trigger will get used to trigger the MSD box, this allows the ECM to control timing with the benefits of the MSD ignition.

Laying out your goals for this engine will greatly help us give you a clear plan on what to use and how to connect it.

[EagleMark]

Laying out your goals for this engine will greatly help us give you a clear plan on what to use and how to connect it.

I agree. Someone sent him here for information as what he was getting elsewhere was mis information. I don't think he knows yet what his goals are other than EFI, he got a LT1 harness PCM and parts which is going to be a lot harder to do a conversion with than say 1227730. So it's been more of an information learning experience for him till this point. He may have enough information now to decide on what kind of system to build using parts he has an adapting others.

[FSJ Guy]

I can't help you with the LT1 PCM or harness. I've never played with one. However, I have used a 1227747 ECM and have since switched it over to the 16197427 PCM. Both of those computers will use the STOCK AMC distributor for ignition and timing control. As mentioned, you will have to lock out the mechanical advance and simply disconnect the vacuum advance. There are a bunch of writeups all over on how to use the '7747 ECM. It's easy to modify and simple to use.

The 16197427 PCM has a huge increase in the # of parameters that can be changed and adjusted. But if this is your first time programming a TBI system, it can be pretty intimidating. One of the biggest advantages (IMHO) of the '7427 PCM is that it has a faster data output and larger tables for spark and fuel.

With regards to keeping your MSD: The distributor is connected to the PCM. The PCM outputs a signal to the MSD. The MSD then sends spark to the engine (via the distributor, of course). Another advantage of the computer controlling timing is that you no longer need the Duraspark system.

BTW, this is all assuming you don't have something like a Prestolite ignition (points).

[EagleMark]

This covers wiring of MSD 6a in all applications including installing it in a stock EFI system.

[jeepboy45]

This covers wiring of MSD 6a in all applications including installing it in a stock EFI system.

This is the current MSD config:Wiringdiagram.jpg


I could be reading/understanding this ALL WRONG, but here goes...... The MSD module would get abandoned. Using hybrid dizzy as you mentioned earlier in thread, the dizzy would be connected directly to ECM, and ECM to coil?

My head is beginning to hurt!

[Six_Shooter]

The ignition module gets connected to the ECM, to both trigger the ECM and allow the ECM to control timing. The igniton control module also triggers the MSD box. Look at the points trigger setup using the white wire.

[jeepboy45]

The ignition module gets connected to the ECM, to both trigger the ECM and allow the ECM to control timing. The igniton control module also triggers the MSD box. Look at the points trigger setup using the white wire.

I gotta clarify this: when you are referring to "ignition control module" or "ignition module" are you referring to the module inside the distributor, arent you? This is all new terminology to me. I get it now. I've been getting that confused with the old school ford "brain module" (crappy square box with epoxy melted in the back) Old school Jeep wiring had only that ford module and the dizzy...thats about it. I replaced that "brain" with the MSD....

I'm still trying to clarify if using that hybrid dizzy is a good way to go. At first glance it an AWESOME WAY TO GO. Using that hybrid will allow me to connect it to the ECM, and so on and so on like you just described... I get it now.

I'M SORRY FOR THE seeminly dumb questions..... I've gotten lost in some of the terminology that I'm still getting used to.