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How to Turbo Charge a 4.0 L Jeep Cherokee Sport XJ?

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How to Turbo Charge a 4.0 L Jeep Cherokee Sport XJ?

Old 05-23-2010, 08:44 PM
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Post How to Turbo Charge a 4.0 L Jeep Cherokee Sport XJ?

Hello everyone, I'm new to this website. I'm curious to know about what is required to turbo charge my jeep. I know the obvious stuff like the turbo charger, bov, wastegate, intercooler.

But as far as the computer stuff, and other parts I'm not to sure.

I can't afford to buy a jeep turbo kit, but I live out in the country, and we have tons of junkyards out here. I was thinking of getting a small turbo kit from a saab, or a talon.

This is just a project in mind, but I would like it to make a reality out of it. So I require a bit of guideline. If anyone here has done a home made turbo kit on their Jeep, I would love some info on what was required on your setup.

I'm not looking to make a massive amount of horse power, I was thinking of adding an extra 150 hp on top of what I have now. Something like 5, to 10 psi keeping it safe. It's my daily driver, and the cops could be crude out here in Canada.

If you guys have pictures of your 4.0L turbo I would love some links also. Thank you everyone in advance.

-Alex
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Old 05-24-2010, 09:33 AM
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hardest part will be finding/fabricating a turbo manifold.

lol. 150hp above stock is a lot of power and will most likely kill your stock motor.
for every 1psi boost you will make ~10 more hp. a safe amount of boost on a stock engine is 8psi or less. this is just a general rule of thumb. some engine can take more or less but for the most part 8psi is a good number most people run reliably
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Old 05-24-2010, 10:42 AM
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Originally Posted by busa4 View Post
hardest part will be finding/fabricating a turbo manifold.

lol. 150hp above stock is a lot of power and will most likely kill your stock motor.
for every 1psi boost you will make ~10 more hp. a safe amount of boost on a stock engine is 8psi or less. this is just a general rule of thumb. some engine can take more or less but for the most part 8psi is a good number most people run reliably
with th 4.0L jeeps you dont need a manifold. just modify the exhaust pipe where it wraps around the front of the motor and bring the pipe up to the top of you engine bay on the pass side. If you want to se how its done look at this web site. 505 Performance I have a 97 wrangler that i turboed based off thier system and the only thing I had to do was buy the piggy back computer from Split Second because I was pushing more than 8lbs of boost. when I was running I was running a stock turbo from an eclipse gsx I never needed to modify the fuel progaming. I only needed to use the piggy back after i changed turbos and got in the higher boost levels, stock HP on the 4.0L avg is about 175 with a T3T4 turbo boosting 22 lbs I dynoed in 3rd gear at 4800rpm - 310 HP @330 ftbs torque, on all stock motor, the only mods were the fuel injectors and piggy back computer. I also did a dyno pull with 100 shot of NOS, same gear and rpm and ran 377HP @ 344 Torque

What year is your jeep? and do you know what country it was built in? Here is a pic of my wrangler.
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Last edited by thumpn; 05-24-2010 at 11:03 AM.
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Old 05-27-2010, 09:36 PM
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Originally Posted by thumpn View Post
with th 4.0L jeeps you dont need a manifold. just modify the exhaust pipe where it wraps around the front of the motor and bring the pipe up to the top of you engine bay on the pass side. If you want to se how its done look at this web site. 505 Performance I have a 97 wrangler that i turboed based off thier system and the only thing I had to do was buy the piggy back computer from Split Second because I was pushing more than 8lbs of boost. when I was running I was running a stock turbo from an eclipse gsx I never needed to modify the fuel progaming. I only needed to use the piggy back after i changed turbos and got in the higher boost levels, stock HP on the 4.0L avg is about 175 with a T3T4 turbo boosting 22 lbs I dynoed in 3rd gear at 4800rpm - 310 HP @330 ftbs torque, on all stock motor, the only mods were the fuel injectors and piggy back computer. I also did a dyno pull with 100 shot of NOS, same gear and rpm and ran 377HP @ 344 Torque

What year is your jeep? and do you know what country it was built in? Here is a pic of my wrangler.
WOW. good info for sure. What size injectors did you use? And what type of piggy back computer system from Split Second did you get? I found this link. http://www.splitsec.nl/framepage3.htm I don't know which one I would need?
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Old 05-27-2010, 10:29 PM
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I didnt have to go with bigger injectors untill I changed turbos but when I did I used 26 lb injectors. The Piggy back I used was the FTC1 model from split sec when they sell you a computer they give you a base map to start with. here is the link for the piggy back, Fuel-Timing Calibrators
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Old 05-20-2011, 06:52 PM
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Is this with all stock internals except injectors? Im am doing the same thing thumpn but im using a small16g turbo and planing to stay under 10psi. Im was planning on upgrading the injectors at the same time I put in the turbo but was planning on useing bigger injectors about 35lbs because as a rule of thumb it is grerally a bad idea to run injectors at over 80% capacity. For my piggyback I was planning on using an AEM system but FTC1 looks good too.

Last edited by smallmand04; 05-20-2011 at 06:58 PM.
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Old 07-30-2012, 10:07 AM
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Default 2002 TJ jeep Turbo 4.0

I have installed a turbo on my Jeep Wrangler 4.0 on WOT in 3rd it cuts down looses power on boost 5-PSI it shows Open Loop when this happens. Will a computer tune help this? I reduced the power to my TPS sensor to stop it from going into Open loops seems to work great.

3.73 gear with 33's possibly gearing is too high?
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Old 07-30-2012, 11:32 AM
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Originally Posted by turtledeclerk View Post
I have installed a turbo on my Jeep Wrangler 4.0 on WOT in 3rd it cuts down looses power on boost 5-PSI it shows Open Loop when this happens. Will a computer tune help this? I reduced the power to my TPS sensor to stop it from going into Open loops seems to work great.

3.73 gear with 33's possibly gearing is too high?
Are you using a stock computer here? You don't want to go into closed loop fueling under boost as this will run way too lean. You definitely want to get it tuned for what the engine needs here, and run open loop under boost.
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Old 07-30-2012, 01:06 PM
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yea its stock Computer Closed loop i'm 12:1 once it hits Open Loop 14:1 on A/F ratio. This is when it bogs down if I force Open loop from the start it doesn't run very good. timing is around 18deg final either open or closed.
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Old 08-20-2012, 09:25 PM
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My previous post is wrong. I bought a new A/F meter from AEM and i'm in Open Loop stock O2's unplugged I'm pretty good with A/F 12-14:1 upto around 5psi around 7psi i'm at 17:1 quickly then its off the scale around 9psi then the jeep falls on its face until i let off. I'm running 32lb injectors now, Will the Piggy back help give more fuel in the scenario? I assume that OpenLoop is giving it 100% on the injectors at WOT Im not sure how thumpn is able to do 8psi with no fuel or computer mods.
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