Good day! I'm looking to try and change this system into a stand alone without the computer.

Thanks!!

 

I have a 87 and researched what you are suggesting. The problem is, I dont think anyone makes a distributor that will work.......
It used to be, (25 or so years ago) mopar offered an electronic ignition package, camshafts, 4 bbl intakes, headers, etc for the 3.9 but it has been discontinued for a long time.
A thought I had was to use one of the aftermarket GM style V8 distributors that are designed for SBM V8's
Then if possible, use the trigger wheel and distributor cap from a GM 4.3
But honestly, I have no idea if its possible.......
The carb would be pretty simple. You currently have a holley 6280 and it would not be hard to convert to a 2280.

At the end of the day, I ended up converting mine to a 5.9 magnum with a edelbrock carb intake.....

Good luck and let us know what you do.

 

im not sure of the year but you can use a distributor from a 3.9 that had a tbi style injection and then connect distributor to an msd box .

 

Quote:

Originally Posted by wheily

im not sure of the year but you can use a distributor from a 3.9 that had a tbi style injection and then connect distributor to an msd box .

Out of curiosity, have you actually done this? The reason I ask, I was told that the factory distributor was not compatible with the holley of fast efi systems.
I "think" the factory distributor is a hall effect design.........
It would surprise me if it worked with msd......
I could be wrong...... wont be the first or last!

 

I could see how the magnum series distributors wouldn't work, they are indeed a hall-effect switch, but, the switch only changes state twice per distributor revolution, and I suspect the holly is going to require a pulse for each individual cylinder, so, 6 changes per dist revolution..... Do the TBI distributors use the same cam sensor as the magnums? Or is there actually a six pulse H-E switch in there?

 

the tbi is a mag style pick up like the older la engine uses with the regular mopar ignition box...
also have not done my self only know from reserch that it will work acording to guys that have installed a turbo..

 

The distributor for the 87-91 3.9 was a "hall effect" style distributor.
Below is the pick up coil used in the 87-91 3.9.
I can post a picture from the service manual showing it as a hall effect, but it will be this evening before I could.
https://www.rockauto.com/en/moreinfo...WLxj3%2Bpr0%3D

Here is a picture of the complete distributor. If you notice, the stock distributor has no vacuum advance or centrifical advance.
https://www.rockauto.com/en/moreinfo...t=7108&jsn=673

 

so i was wrong it is a halafect but for a pre magnum engine and the guy used a megasquirt2 to keep injection....

 

out of curiosity i looked threw some spare parts and found that the 6 sided trigger wheel off a slant 6 distributor will fit on the v8 distributor for the la engine..but had no caps or rotors to see if they would interchange.

 

Its a shame that there is little to no support in the aftermarket for these engines. I frequent a site that caters to A body mopars. Lots of post considering the use of the 3.9 for hotrods....... until they see there is nothing available to modify them with,