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Old January 29th, 2008, 11:19 AM   #1
Rob the plumber
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Default Turbo YJ project

I have an AMC 360 to install in my 1995 YJ, but I have always wanted to put a turbo on a Jeep, so i figured for a few hundred bucks I could try my luck. I picked up a t3/t4 Garrett pretty cheap. It is a pretty small turbo, but it should work great on the little 2.5L, make great torque, and have zero lag.

1995 YJ:


Engine bay with electric fan mounted. I picked up a 75 amp relay and an adjustable thermostat switch for the fan on Ebay for like $30. I got the fan from a board member for $50.



I made a mounting bracket out of 1/4" plate at work. I will attach it to the a/c bracket from my non-a/c Jeep.



Mounting bracket installed. I know it is not fancy, but I am not very pretty either.



Turbo temporarily mounted. I still have to weld up the inlet and outlet flanges to get down to 2.25" pipe. It is currently 2.5" The hot side should be done soon.





More to come as I plug along.
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Old January 29th, 2008, 11:24 AM   #2
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thats gunna be sweet
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Old January 29th, 2008, 11:38 AM   #3
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I'll be interested to see your exhaust routing. IMHO, use heavy guage steel and wrap and insulate the heck out of the exhaust inlet side. You don't want those gasses to cool off.
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Old January 29th, 2008, 12:13 PM   #4
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I am going to ghetto flexpipe the hot piping to get it running. Then take it to a shop to have pipes bent. I already ordered a big roll of ceramic heat tape.
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Old January 29th, 2008, 08:54 PM   #5
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this will be interesting
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Old February 1st, 2008, 01:30 PM   #6
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Quote:
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Is that rubber thing on the outlet of the compressor something you got at a hardware store I always laugh when people use those rubber couplers for intakes and such. Still pretty cool anyway
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Old February 1st, 2008, 01:37 PM   #7
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Default good times!!

I've always thought about throwing a turbo on my 4.0 just to see what would happen. I'm getting parts together to rebuild it and stroke it anyway, so why not. Let us all know how it works out. It should be cool.

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Old February 1st, 2008, 02:48 PM   #8
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That fitting is a 2"x1 1/2" Fernco, of the hardware store variety. It was on the turbo when I bought it. I will use real silicone couplings when it gets put together.

I also think I might ditch the temporary flexpipe idea and just buy a welder and hardpipe it myself. I could have this done in one day if were 60 degrees and sunny. :) I am not too motivated to work on it right now.
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Old February 1st, 2008, 04:24 PM   #9
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I'm real interested in seeing how this turns out.
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Old February 1st, 2008, 04:36 PM   #10
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What are your plans as far as adding extra fuel and tuning it? Even with a few pounds of boost it will need to have the fuel pressure rise accordingly and maybe even bigger injectors.Are you swaping to a bigger fuel pump? What is the stock compression of that motor?

Sorry for all the questions but turbo swaps are kinda my thing and I have seen way too many people waist their money and screw up good cars/trucks cuz they didnt have things planned out 100% before they started.
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Old February 1st, 2008, 04:52 PM   #11
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I think the engine is about 8.5 to 1. For the fuel side, i put in a Walbro 255lph pump. GSS340, high volume and pressure. I used stock Ford 19lb injectors for a better spray pattern. I am also using an FMU to add fuel under boost. I think the FMU has a 12 to 1 disc in it, so it should have more than enough fuel for 6 psi or so of boost. I read about a guy who used something like 36lb injectors and an adjustable MAP sensor, but that seems like it might make it run like crap off boost.
The only thing I have not figured out yet is an easy way to pull out timing. I guess you cannot adjust the factory timing traditionally on these motors. I could run an MSD with a BTM, or run something like a Mallory 685 box, but I want to keep it cheap. I'll probably run with the factory timing curve and use premium fuel. I am kinda bummed out that I sold my wideband too.
I will also probably use a stock intercooler from a Talon.
If you have any pointers I would greatly appreciate it. I have a lot of experience with forced induction on Mustangs, a Chrysler Conquest, and a pile of turbo Omni's. :)
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Old February 1st, 2008, 05:14 PM   #12
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plumb that shit out Rob!
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Old February 11th, 2008, 07:47 AM   #13
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I got my Jeep to fit in the garage with the hard top on it. It was a little taller with the soft top and would not fit in the garage.
Well, I got the turbo mounted to the bracket. I welded the flanges up and got them down to 2.25" from 2.5" pipe. For the record, The cheap Murrays exhaust pipe welds like shit. It is way too thin. I also wired the Taurus fan in with a 75 amp relay and an adjustable thermostat controller.



I tee'd into the oil pressure sending unit line to provide oil to the turbo, and I tapped the oil pan about 1 1/4" from the top with a 3/8" npt tap for the oil drain.




This picture shows the exhaust routing underneath the Jeep. I think the flexpipe is cheezy as hell, but it will work for now to get it driving and tuned in. I can have heavier gauge pipe bent later. I also bought a couple rools of ceramic heat tape to wrap the pipes with. The downpipe runs down te passenger side and is pretty close to the wires and stuff down there. It looks like I can wrap the pipe, tie some wires back and I should be o.k. I also have to slightly reroute the heater core hoses to get them away from the hot pipe.



I ordered an intercooler and some silicone couplings and bends to plumb up the cold side piping. I think I am going to try to use the factory airbox too. It is much safer for when things get wet. I also still have to hook up the FMU, and secure all the vacuum lines to keep them from popping off under boost. I also still have to hook up the boost gauge.
More to come!

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Old February 11th, 2008, 07:51 AM   #14
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As you can see in the above picture, I also had to order a flexible stainless steel upper radiator hose to get around the turbo. The stock hose would sit right against the cartridge. I also reclocked the cartridge so the oil would feed in the top, and gravity drain out the bottom. The compressor scroll was also rotated to point somewhat in the right direction.

Last edited by Rob the plumber; February 11th, 2008 at 07:57 AM.
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Old February 11th, 2008, 03:43 PM   #15
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looking good, can't wait to see how she runs.
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Old February 11th, 2008, 05:40 PM   #16
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Awesome.

I'll be interested to see how long it takes to spool with all that distance between the manifold and compressor.
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Old February 11th, 2008, 06:14 PM   #17
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Quote:
Originally Posted by ScOoTeR View Post

Awesome.

I'll be interested to see how long it takes to spool with all that distance between the manifold and compressor.
that shouldn't have any real effect on spool rate as all the exhaust energy is still directed at the turbine....they make rear mount turbos for cars and such...
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Old February 11th, 2008, 07:02 PM   #18
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that shouldn't have any real effect on spool rate as all the exhaust energy is still directed at the turbine....they make rear mount turbos for cars and such...
A huge part of good turbo performance is getting the heat to the exhaust side of the compressor.
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Old February 11th, 2008, 07:11 PM   #19
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If this works out, I'll be sorry I swapped a 350 in for my old 2.5
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Old February 11th, 2008, 07:13 PM   #20
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If this works out, I'll be sorry I swapped a 350 in for my old 2.5
Don't fret.

You still have lots of lugs.
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