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Unread 08-09-2013, 09:40 AM   #31
123YJ
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UPDATE:

After some problems with making payments, Roger at CRT Performance just informed me that it will be another week before parts are in his warehouse, then time required to ship. Because I am already skeptical, I've asked Roger to cancel my order.

Now the question is whether I should just buy a BWD ICM from Advanced auto for $70 or pay the $300 for a DUI distributer...Thoughts?

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Unread 08-09-2013, 09:44 AM   #32
tslroper
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Just go DUI. I replaced the ICM in mine twice a year for two years before getting p*ssed off and spending the money on the DUI. It's a great investment and well worth the money. The DUI distributors sold on quadratec and such sites are set up for the stock motor already. If you've done any custom work on the motor then contact Performance Distributors directly.
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1990 YJ Islander, 4.2L MC2100 DUI HEI, 2.5" RE lift, 31x10.50 DuraTracs, HandenFab rear bumper / swing-out, Tough Terrain
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Build thread: http://www.jeepforum.com/forum/f22/tys-yj-build-1502554/
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Unread 08-09-2013, 10:01 AM   #33
roadyrob
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I agree, go with DUI. the whole idea with HEI is to upgrade the stock parts to a simpler and better system. davis builds a quality distributor, its the price that scared me off.
tslroper, thanks for explaining the fixed vacuum advance.
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Unread 08-09-2013, 10:05 AM   #34
123YJ
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Chatting with Quadratic now...Do you know if a Stock (nuttered) 89 YJ I-6 requires the Tach accessory?
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Unread 08-09-2013, 10:19 AM   #35
roadyrob
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I assume the dui hooks up the same as my crt hei, ( the crt is just a clone of the dui) the tach wire just plugs into the distributor, no accessary needed.
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Unread 08-09-2013, 10:28 AM   #36
123YJ
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Roadyrob, Thank you!

When you say that the Tach wire plugs into the distributer, is that in addition to the 12v wire, or is that the 12v wire?





Oh, just ordered a DUI HEI from Summit Racing, Overnight shipping was only an additional $25. Should be here tomorrow (Saturday)
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Unread 08-09-2013, 10:45 AM   #37
tslroper
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The stock tach wire can be connected to the tach port on the distributor. It's technically a 2-wire hook-up, one for the tach and the 12v wire. The DUI comes with the terminal ends so you can simply cut the current terminal end off your tach wire and crimp the new one on and connect it straight to the distributor.
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1990 YJ Islander, 4.2L MC2100 DUI HEI, 2.5" RE lift, 31x10.50 DuraTracs, HandenFab rear bumper / swing-out, Tough Terrain
off-road camp trailer.
Build thread: http://www.jeepforum.com/forum/f22/tys-yj-build-1502554/
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Unread 08-09-2013, 10:56 AM   #38
123YJ
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Quote:
Originally Posted by tslroper
The stock tach wire can be connected to the tach port on the distributor. It's technically a 2-wire hook-up, one for the tach and the 12v wire. The DUI comes with the terminal ends so you can simply cut the current terminal end off your tach wire and crimp the new one on and connect it straight to the distributor.

Tslroper,

Thank you.

If I may play the dumb question card, Would anyone by chance know the colors of the Tach & 12v wires?
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Unread 08-09-2013, 11:24 AM   #39
tslroper
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Here's a thread that includes the diagram for how I wired my HEI.

http://www.jeepforum.com/forum/f8/gm...m-help-733155/

As for the tach wire, I believe it is green with a white trace. Just be aware that there are 2 such wires if you have not removed the excess wiring in your engine bay yet. One of the wires runs to the computer and one to the tachometer. They're both green with white trace. Find the wire that comes out of the bulkhead connector on the drivers side that is green with a white tracer and follow it back to the ignition... thats the one you need. The tach wire for the computer goes through the firewall right behind the intake manifold.
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1990 YJ Islander, 4.2L MC2100 DUI HEI, 2.5" RE lift, 31x10.50 DuraTracs, HandenFab rear bumper / swing-out, Tough Terrain
off-road camp trailer.
Build thread: http://www.jeepforum.com/forum/f22/tys-yj-build-1502554/
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Unread 08-09-2013, 12:24 PM   #40
123YJ
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tslroper,
Thanks for the link!



Based on the schematic, it shows 3 wires going to the HEI distributor.
1) 10-12 gauge 12v Red wire
2) 18 gauge (red?) factory harness coil wire.
3) green/white factory harness coil connector. (Assume this is the Tach wire)

From previous discussions, I'm unclear about wire #2 (18 gauge (red?)) wire as it seems contrary to what was shared. Can anyone elaborate?
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Unread 08-09-2013, 12:30 PM   #41
tslroper
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That diagram only shows one wire connected to the distributor (the 10G red). The rest of the wires connect to the relay, this is a common automotive relay you can buy at any auto parts stare for $5 or so. The 18G red and green wires are shown on the stock ignition coil connector. It's simply showing you where those wires are in your engine bay.
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1990 YJ Islander, 4.2L MC2100 DUI HEI, 2.5" RE lift, 31x10.50 DuraTracs, HandenFab rear bumper / swing-out, Tough Terrain
off-road camp trailer.
Build thread: http://www.jeepforum.com/forum/f22/tys-yj-build-1502554/
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Unread 08-09-2013, 12:40 PM   #42
123YJ
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Quote:
Originally Posted by tslroper View Post
That diagram only shows one wire connected to the distributor (the 10G red). The rest of the wires connect to the relay, this is a common automotive relay you can buy at any auto parts stare for $5 or so. The 18G red and green wires are shown on the stock ignition coil connector. It's simply showing you where those wires are in your engine bay.
Ohh...OK.

I was assuming the old coil wires (18 gauge red, and green/White) were re-connected onto the new coil sitting on top of the HEI distributor.
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Unread 08-09-2013, 12:48 PM   #43
tslroper
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You technically could (and many people do) just connect the old coil wires directly to the HEI, however theres a resistor in that red 18G wire. For your HEI to perform at its full potential its recommended that you install it on a relay as shown so the HEI gets a full 12V.
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1990 YJ Islander, 4.2L MC2100 DUI HEI, 2.5" RE lift, 31x10.50 DuraTracs, HandenFab rear bumper / swing-out, Tough Terrain
off-road camp trailer.
Build thread: http://www.jeepforum.com/forum/f22/tys-yj-build-1502554/
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Unread 08-09-2013, 02:04 PM   #44
123YJ
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Here I go with those silly questions...

The schematic show the 10/12 gauge wire coming off the hot side of the solenoid to the relay. There must be a wire to the ignition switch, or is the old 18gauge red coil wire serving as the power for the relay?

Guess a better question might be, What relay switch are we using?

Look what dug up...

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Unread 08-09-2013, 04:56 PM   #45
tslroper
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For this application we're using the one labeled "common single circuit" on your picture. The 85 and 86 terminals can be reversed without issue, same with the 30 and 87 terminals. The old 18G wire from the coil is triggering the relay to allow a full 12 volts straight to the HEI from the battery. That's the point of the relay, you get a full, clean 12 volts from the battery going straight to the HEI. Yes, it shows the 10G wire coming from the battery side of the ignition coil. That's normal, the battery side of the ignition coil serves as a distribution post of sorts.
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1990 YJ Islander, 4.2L MC2100 DUI HEI, 2.5" RE lift, 31x10.50 DuraTracs, HandenFab rear bumper / swing-out, Tough Terrain
off-road camp trailer.
Build thread: http://www.jeepforum.com/forum/f22/tys-yj-build-1502554/
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