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  #1  
Old August 4th, 2015, 12:28
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PhotoJared PhotoJared is offline
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Projext "V8 XJ" Build

Hey Guys,

I wanted to document the build and try and be as detailed as possible to help out those that may want to tackle this swap in the future.

Here are a few threads that I'll be using to help me out.
http://www.naxja.org/forum/showthread.php?t=1108551
http://www.naxja.org/forum/showthread.php?t=1007477

A little background on me. I started with Hondas. I had a 95 Prelude that I did 2 motor swaps and built a hybrid motor for. Now those swaps were just like for like. This is an entirely different ballgame.

About our Jeep. I say "our" Jeep as its my wife's and mine. I pretty much have free reign over what happens with the Jeep, but I have to keep it "family friendly". My wife still wants to be able to go on a camping road trip and be comfortable. Hell I want to be comfortable too. So this will dictate a lot of what happens.

The Jeep: I purchased this 99 XJ in March of 2012 after our first XJ was totaled by a 16 year old kid. This thing has been great for the most part. Of course I've had some cooling issues. Replaced the entire cooling system and it was good for a while. Still overheated and I was pretty sure the head gasket was junk. I've had the thought of swapping a LS into the Jeep for a while, but I just never had a reason to. I was really wanting to swap in a reman engine, but realized i've never really been happy with my 99. I kept trying to do things to increase power and fuel economy, but never got to my goal. I have my fuel economy saved since I've purchased the Jeep. Every single fill up was entered in the app. I averaged 13.71 MPG over 45,000 miles. My highest ever was 22 MPG and lowest was 9 MPG.

Back in May of this year it started to get hot way to early in the season. I live in Las Vegas and need something that can be daily driven. I also started my career in real estate. I drive about 1200 miles per month. The Jeep wasn't the most "professional" car to drive. My wife and I agreed that we needed something that was more commuter friendly. Me being me picked a 2015 Civic Si Sedan. Something that is nice looking, family friendly, yet still fun to drive.



This is the single biggest thing I've done to a car. I'm looking forward to the challenge. I'm pretty capable with the mechanical things, but I am NOT looking forward to the wiring.



So back to the Jeep. I've changed it a few times over the years, but here's how it currently sits:

5.5" RE Coil Springs
3.5" Leaf Springs
HD No lift shackle brackets
1" Rusty's shackles
IRO Adjustable Long Arms
60mm Throttle body
Neon Injectors
JBA Header
Banks Catback
CSF 3 row
Dirtbound (like) fan setup - Put together myself
Protofab Tube Front bumper
Mile Marker 8000 winch
31" Duratracs on TJ Canyon wheels with 1.5" spacers
Napier Flares
Custom Louvers




Heres what it looks like:




Heres how it currently sits:


Please let me know if you have any questions.

Last edited by PhotoJared; August 4th, 2015 at 12:37.
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  #2  
Old August 4th, 2015, 12:29
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PhotoJared PhotoJared is offline
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Re: Projext "V8 XJ" Build

I wanted to go over my plans for this build.

Its going to go fairly slowly as I pretty much work 7 days a week. I get interrupted in the middle of my days off by clients looking for answers. Its ok, nature of the business.

Here's the parts list:

Motor: Not sure yet 4.8/5.3 is what I'll likely go with (I'll decide when I'm ready to purchase)
Trans: 4x4 4l60e
Motor Mounts: Novak MMXJ3 - RECEIVED
TC Adapter: Advance Adapters - AA-50-0435
- Still unsure if I want to get this or use a hybrid S10 241/231 case to bolt right up
Radiator (With Taurus Fan)- Griffin 1-28282-TLS
Harness Mod & ECU Tuning: 150Tunes.com
Fuel - Still unsure about. Not sure if I want to adapt the GM fuel pump or use an in tank replacement pump with external FPR
Gauges - Adapting Stock to the LS
Headers - Novak LSXJ3
Exhaust - local exhaust shop as I don't own a welder
AC Relocation - Novak ACG3-3 - NEED AC in Vegas
*Bunch of other shit* - I'm sure I'll need a bunch of random stuff, but I'll keep this updated with what I buy.

One VERY important thing I missed. I HAVE to keep this Jeep SMOG legal. Yes, SMOG LEGAL. I want to be able to drive it across the country if I so choose.

Last edited by PhotoJared; August 4th, 2015 at 12:43.
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  #3  
Old August 4th, 2015, 12:33
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Lowrange2 Lowrange2 is offline
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Re: Projext "V8 XJ" Build

Looks interesting. Subscribed.

There's ways around the wiring...
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  #4  
Old August 4th, 2015, 12:39
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Re: Projext "V8 XJ" Build

I took off the intake and exhaust as they have been sold. Took about an hour to get the intake and exhaust manifolds off. I don't know why people fuss about getting them off (Its pretty damn easy).

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  #5  
Old August 4th, 2015, 12:41
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Re: Projext "V8 XJ" Build

Quote:
Originally Posted by Lowrange2 View Post
Looks interesting. Subscribed.

There's ways around the wiring...
I don't plan on modifying the length of the XJ harness. I want to keep it clean without extending a thousand wires. I'm thinking I'll just strip all of the excess out of the XJ harness and leave what I need (Pretty much just the coolant temp sensor and Oil pressure).
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  #6  
Old August 4th, 2015, 12:51
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Re: Projext "V8 XJ" Build

DAMN TITLE TYPO!
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  #7  
Old August 4th, 2015, 12:56
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Re: Projext "V8 XJ" Build

Are going with the 6.0 or 5.3?

You intend to use all XJ harness?

Why not use the GM harness and ECM.
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  #8  
Old August 4th, 2015, 13:07
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Re: Projext "V8 XJ" Build

Quote:
Originally Posted by Lowrange2 View Post
Are going with the 6.0 or 5.3?
Not sure yet, I'll decide when I order the engine. It'll most likely be a 4.8 or 5.3 for cost reasons

You intend to use all XJ harness?
no I just meant that I'm not going to be modifying the XJ harness extensively (like moving it under the back seat). It'll be staying in the stock location

Why not use the GM harness and ECM.
I will be.
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  #9  
Old August 4th, 2015, 13:46
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Lowrange2 Lowrange2 is offline
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Re: Projext "V8 XJ" Build

Ok. I misunderstood!

Cool.

You plan to order a new engine or will you buy buying a used engine?
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  #10  
Old August 4th, 2015, 13:50
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Re: Projext "V8 XJ" Build

Quote:
Originally Posted by Lowrange2 View Post
Ok. I misunderstood!

Cool.

You plan to order a new engine or will you buy buying a used engine?
It will be used with a short warranty (part of the reason I'm waiting to order)
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  #11  
Old August 4th, 2015, 14:06
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Re: Projext "V8 XJ" Build

Quote:
Originally Posted by PhotoJared View Post
It will be used with a short warranty (part of the reason I'm waiting to order)
Gotcha. Makes sense.

I made that mistake once. Ordered. Took forever to get it buttoned up. Spun a rod bearing 2 days out of warranty.
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  #12  
Old August 6th, 2015, 16:10
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Re: Projext "V8 XJ" Build

Spent some time today labeling connections and clearing out some accessories.
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  #13  
Old August 7th, 2015, 18:16
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Re: Projext "V8 XJ" Build

Engine harness is out! Only 6 of the plugs actually stay.
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  #14  
Old August 7th, 2015, 18:17
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Re: Projext "V8 XJ" Build

Engine is also clear of accessories. It's pretty much ready to come out.


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  #15  
Old August 7th, 2015, 20:14
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John D John D is offline
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Re: Projext "V8 XJ" Build

I wouldn't consider the 4.8 as an option, it's a lot of work for a small gain. The 5.3 is a good economical option, but depending on how you use the car it could leave you wanting more. If you can swing it go for a 6.0, in hindsight I wish I had saved a little longer for a 6.0.

The wiring isn't that difficult for either the XJ side or the GM harness and integrating the two. Check out lt1swap.com for all of the GM information you could want/need.

Good luck with with the build.
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