I just finished putting a Weber carb in my 6-cyl. '89 YJ and I've read, at several Web sites, that replacing the stock distributor with a Chevy HEI-type distributor will improve performance even more. Have any of made this swap? Is it all it's built up to be?
Yeah, throw the new distributor, cap, wires, igniton coil, etc etc on there. All of the parts can be drawn from an early 80's (82?) Ford F150. You'll marvel at how it changes your idle, in particular, and the fact that you can accelerate smoothly through 4000-4500 rpm....
I just did the TFI "TEAM RUSH" ignition upgrade it was definitely the thing to do! If you use the "SEARCH" you will find out the GM HEI ignition is MUCH HARDER and MORE EXPENSIVE to do PROPERLY (You don't just drop a HEI distributor off the shelf in there it must be altered different pieces from different distributors, sounds like a real headache, plus the TFI is supposed have better performance anyway [img]images/graemlins/laugh.gif[/img]) . Click on this for my experiance http://bbs.off-road.com/ubbthreads/s...o=&fpart=1
I've done the TR upgrade to my 87, the difference wasn't that great until I also did the Nutter Bypass. I'm now planning to go to the HEI for hopefully better reliability.
The HEI swap is pretty easy, you just change the drive gear off the distributor for one from 4wd Hardware, $25 bucks, takes 5 minutes. Then just take out the old Duraspark Distributor, coil and the POS Duraspark module out and drop in the HEI distributor in. Then run switched power to it and you're done. If you can get an HEI distributor cheap it won't cost much more than the TR. I've been told that the HEI is very reliable, I know from experience that the Duraspark is somewhat unreliable. I'm guessing that performance is probably the same.
[img]images/graemlins/smile.gif[/img]I've driven Chevy pickups for years.....NINE of them at last count [img]images/graemlins/shocked.gif[/img].....and the GM HEI does have it's failings. [img]images/graemlins/mad.gif[/img] I never leave the yard without a spare rotor since they can blow through quite easily. We did the TR upgrade on our 304 and TR himself built us a superb ultra-ultra-ultra dual-pickup, dual coil, super-redundant emergency-vehicle-grade, NASCAR type, distributor. [img]images/graemlins/cool.gif[/img] [img]images/graemlins/cool.gif[/img] With the TR system you can step up to the MSD module and THAT is the thing that really sweeps out the corners on both economy and performance. Our system uses an MSD with a Motorcraft module as the backup. We didn't want our Jeep to quit on us when the UN troops are chasing us to get the last gun in America still in private ownership [img]images/graemlins/crazy.gif[/img] Seriously, your best choice would be the TR upgrade, and then as time and finances permit add the MSD6 module for that sustained spark that really gets that 2-2-4 Trimethylpentane to burnin'. [img]images/graemlins/tongue.gif[/img]