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

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.
Attachment 6195

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?

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

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.

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?

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.

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.

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.

Hello,so i'm specialized in Supercharger modding and instalation,i left here some pictures with our projects(Grand Cherokee SRT Supercharger,Opel Astra turbokit and intercooler,and renault clio custom exhaust manifold...so if i can help you please contact me here or on my email vali_mvgrup@yahoo.com

Have a nice day

Wrangler TJ
 

Installed the AEM FIC 6 on the Wrangler problems solved plenty of gas with the 30# injectors up to 13psi boost AFR around 13:1 took some time to dial it in but works great. The stock ECU sends CEL Injector circuit open for all 6 injectors. I used 5ohm 20watt wire wound resistors from the negative output ECM to the Positve of injectors to simulate load and ECU is happy now Closed Loop mode when tooling around town Open loop after few psi boost and the fuel table takes over and gives it what it needs along with the Ignition Map to retard the timing.

2002 TJ Wrangler 4.0 12psi with 33" tires 3.73 gear
0-60 5.2 sec

what about using a FMU

hey what happend whit map when reads boost

I did my own custom turbo set up on my Cherokee, I used a T3 T4 60 trim turbo. I am currently running 10 pounds of boost. For fuel system I installed injectors from a 2004 Mustang cobra. The 2004 cobra injectors are actually different injectors than your stock wiring harness so you will have to rewire the stock wire harness to the connectors for the cobra. The cover uses a injector that is a Ev6 style is why you have to rewire it. For reference, timing is not adjustable through the distributor on a Jeep Cherokee 4.0. In order to adjust timing you have to remove the crankshaft sensor and drill the holes larger in the bracket to be able to adjust timing. The reason why you have to adjust timing this Way is because the computer controls the timing on a Jeep Cherokee 4.0 or even any Jeep 4.0 motor. Down the road I do plan install a standalone computer system like an AEM or Fast system so I can tune it more. I did also disconnect my stock O2 sensor that way it leaves it open loop so the computer doesn't try to lean about so much. I also am planning to change out the fuel system and use a different pump and lines so that I can get an adjustable fuel pressure regulator due to my Jeep being renix so I've been able to find an adjustable fuel pressure regulator for it. Also since my jeep is a Renix I had to build a custom elbow with mounting bracket for the stock throttlebody because mine doesn't have the lip to build a put the hose on to. Here is a couple pics of my set up

Here's another.

On a sidenote I forgot to mention before that I also ran a 2° colder spark plug and closed the gap down to .30 us to assure that I wasn't blowing out the spark which I would highly recommend anybody doing turbo.

How did you run the oil line to the turbo?

fails going on boost
 

I have a jeep xj 2001 and I would like some help I put a turbo t3 / t4 I want to put 13 or 14 pounds boost buy a few injectors of 39 lbs ev6 a sct flash and a map sensor of 2 bar in 505performance tell me that I do not occupy a Piggy back with this configuration, they never answer me in 505 and the xj does not boost at all when passing the meter of 0 boost fails

Turbo on jeep 4.0
 

Hello I am also turboing an Jeep Cherokee 4.0 I’m wondering if anything on the vacuum system has to be changed? Regarding the brake booster and cruise system

no

What type of turbo do you use ? induce/exducer compressor and turbine size do you have this information ? Do you have lag ?