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Old 11-17-2013, 11:36 PM   #1
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YJ Project Ideas

This is my first post. I'm new. Hello all
So having a jeep is something I've always wanted since my older sister bought her '95 2.5l red hardtop. She has since destroyed that car. It has bad oil leaks, the transfer-case is in-trouble, and it's got all kinds of smaller issues. I don't know everything that's wrong with it, but she's made me an offer of her jeep for a very nice computer of mine, so within the week I'll be having a jeep!
Now, the reason I'm posting is that I'm interested in actually using my jeep, not just looking bad-ass in it. I've got an m90 from a '90 thunderbird supercoup and the block, heads, and all the goodies apart from the rotating assembly (because I used that in my 'stang ) and I was wondering if it's first, possible, second plausible to put that motor in, or if I should just rebuild the 2.5l stock and transfer-case and pop-in the m90 with an IC. What could I expect in HP with both and how challenging will it be?

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Old 11-18-2013, 12:08 PM   #2
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Aww yes. The T-Bird Supercoupe. Way ahead of its time. Sounds like it would be a pretty custom swap to take the drivetrain from the S/C & drop it in a Jeep. Refresh my memory... Is it the 3.8 V6 or a 5.0 ?

5.0 in YJ's are somewhat common, nowhere near as common as a GM small block, but they're out there. If it's the Essex V6, you're own your own I would think. First thing you'll have to change is the tranny. The AX5 behind the 4 banger will not last behind anything other than the 2.5L. Even behind the 4 banger they're a weak tranny.

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Old 11-19-2013, 05:56 AM   #3
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Thanks for the info! The SC was a 3.8l essex. I did my best to find if people had done this swap and couldn't find anything. That's generally not a good sign.

Would it make more sense to swap-in a 4.0 from a newer jeep with it's tranny and then throw-on the m90? I've heard quite a few people using it on the straight six.
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Old 11-19-2013, 07:25 AM   #4
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ALL Supercoupes were 3.8 motors. It should go in on Ford V-8 mounts but no way the AX-5 will handle that motor. I would contact on e of the adapter companies about adapting an AX-15/NP231. Intercooling plumbing may be problematic however.You will also need the SC wiring harness and ECU.BTW 94-95Supercoupe motors are more desireable better ECU,bigger injectors and supercharger. Good L:uck
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Old 11-19-2013, 06:41 PM   #5
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I would opt for 5.0 from an explorer/ mountaineer over the SC motor. I've built numerous mustangs including 3.8s and the 5.0 just has better after market support. If you want to add that m90 they even make adapters for that as well.
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Old 11-19-2013, 11:26 PM   #6
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Originally Posted by stykthyn View Post
I would opt for 5.0 from an explorer/ mountaineer over the SC motor. I've built numerous mustangs including 3.8s and the 5.0 just has better after market support. If you want to add that m90 they even make adapters for that as well.
Will the m90 give enough juice for the Ford 5.0?
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Old 11-19-2013, 11:40 PM   #7
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Is uppose the best question to ask is, if the m90 isn't a good fit for 2.5l, what is the best engine to replace it with in-order to use the m90? I want some experience working with positive displacement supercharger, and this seems to be the perfect moment to do it.
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Old 11-20-2013, 06:38 PM   #8
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Honestly a good centrifugal unit will blow the m90 away on a5 liter. If you are hung on the m90 the 3.8 may be your best option. I still think it would be a poor fit in a jeep though. By the time you fabbed up the mounts, engine management, and drive line you could have dropped a v8 in. If you want boost you can always add that later. If you really want off the beaten path a dodge 4bt Cummins turbo diesel would be an unstoppable rig.
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Old 11-20-2013, 06:47 PM   #9
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In reply to your original question the 2.5 isn't boost ready. The rotating assembly isn't up to snuff and you would really have to spin it which given the intake/exhaust design isn't meant to do. I've seen the m90 on several Ford 2.3 engines and it struggled to produce the numbers that the ihi turbo would on the same engine. The 2.5 seems to be as good as it can practically get from the factory especially after they added mpfi in the early 90s.
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Old 11-21-2013, 07:21 AM   #10
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Not to mention the 3.8/M90 setup would require significant RPM's to make any power, at least I would think it would. You need power & torque right off idle with a Jeep as with any 4x4.

I've seen guys running turbo setups on the 2.5L, you tube is full of them, but they're all running minimal boost. Like stykthyn mentioned, the internals on the 2.5 were in no way shape or form designed to be boosted.

If you want to go Ford power, it would be tempting to find a 5.0/GT40 combo out of an Explorer & go that route. You might have trouble with the exhaust manifolds on the GT40p heads.
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http://i42.photobucket.com/albums/e3...g?t=1411201524
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Old 11-21-2013, 07:42 AM   #11
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Several companies make p friendly headers.
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Old 11-21-2013, 07:57 AM   #12
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Good to know. I've only used the non p heads in the past.
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1995 Rio Grande - 4"RC - 1/2"booms - 33's - 4:88's - 1"MML -
Belly up/302/NP435/NP208/8.8 swap about to start
http://i42.photobucket.com/albums/e3...g?t=1411201524
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Old 11-22-2013, 08:43 AM   #13
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The reason I'm so stuck on the m90 is because I already have it, the entire kit, and it's a positive displacement forced-induction system. There is no better vehicle than a jeep to place such a blower on since it's design is to make sure the boost comes immediately, meaning torque.
My objective, as is the objective of most, is to get the most reliable power for the cheapest amount of money. One of the large problems with home turbos and centrifugals is that they get out of hand easily due to their style (a non-linear boost curve). The m90 seems as reliable as one can get, especially since it has such a low rotational speed in comparison to a procharger for example.
Now, I've spent some time on Novak, and I'm scared-to-death of swapping anything in besides the 4.0l because of the price of conversion kits. I can pull the motor, tranny, and get a new, functional transfer case from a junkyard cheaper than I can even buy a transmission conversion kit from those guys. Is there any other answer to a brand-new novak conversion kit if I do a 5.0 swap, for example?
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Old 11-27-2013, 07:20 PM   #14
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Can anyone tell me what the part (its' a gear that taps in and is locked with an exterior finger-type part bolted from the side). It has a cable that attaches to it. Perhaps tach?) located on the rear side of the 231 transfer case is, please? I'm not sure of the correct orientation of this part.

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