DUI or MDS ignition system?

[rob5059MOD]

I have an 85 CJ7 with the 258 and the stock carb that is giving me a lot of problems. I am going to replace the carb with a Weber 32/36 DGEV carb and new ignition system. I would like to remove the computer and emissions systems.

Which ignition should I go with a DUI or MDS? I want to do it right the first time, and use what I buy now after I rebuild the motor in the spring. When I rebuild in the spring I plan on putting on headers.

Will I need to do anything else?

Thank you in advance for your help.

[brkitnowfixit]

Double check your emmissions regs before you ditch the emmissions stuff.

personally i would go with a stock GM HEI distributor.

i believe you can adaot them to a 258

[hard core XJ offroader]

MDS makes some really good ignition systems

[Jerry Bransford]

I dunno about the DUI system, but the MSD system is outstanding and has an excellent reputation developed over many years. And in case you need to do a search on it, it's MSD, not MDS. smile.gif

[rob5059MOD]

Thank for all the info.

[wissemeier05]

i just put a 258 in and i am running a motorcraft 2100 and a ford stlye ignition and its great.

[dingebre]

I'm running a custom tuned Howell TBI with the DUI ignition and it works great. I found the best running with Bosch Platinum 2 plugs, no gapping and no problems.

I found I had to retard the timing a bit with the advance curve that DUI supplied. The suggested 12 deg BTDC was producing some knocking (hey, when you take out the computer you lose the advantage of a knock sensor and automatic timing adjustment). I retarded the timing to about 8 degrees and run super unleaded to make sure.

The advantage with buying the DUI is it has all the components already there, the gear, advance weights/springs, coil on the cap, and it is a one wire install. The biggest problem is getting a wire that is not going through a resistive wire that is on with the ignition. I ended up installing a relay that takes a wire from the battery directly to the distributor switched by the old ignition wire. Works great.

And, you can get the cap in several colors and it looks nice.

[dingebre]

Well, one correction, you do have to hook up the tach wire, too. So, two wire.

[Slowride]

MSD is what I run and recommend. I'd go with their ready to run distributor, HVC coil and plug wires. If you wanted to run a multiple spark box, their "old" 6AL or "new" Digital 6 boxes are solid performers.