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Old 03-25-2009, 04:44 AM   #1
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Post how do I get more performance from my 2006 4.0ltr Wrangler

I have owner a Wrangler from new. It is not my daily drive but I do enjoy it all except for the fact that I can't believe how gutless it is....which is all the more surprising when you consider what the Japanese and Europeans can get out of engines of a comparable size. It feels like there is a speed and performance limiter attached to the engine.

So I am looking for suggestions for some cost effective and proven modifications for my car. Living in Australia I am going to have to ship the parts which costs serious money so I cannot make mistakes when choosing what to do.

From other forums I am thinking of adding a K&N Cold Air intake, changing the thermostat to get the engine to run at 90 degrees celsius and not the current 100 degrees , get headers (Borla?) and then run a 2.5 inch exhaust system with better cats and muffler. Lastly I will get a piggyback programable engine mapping system and get a tuner to modify the ignition timing, settings for higher octane fuel and another other tweaks to improve performance.

Any comments or help appreciated. Importantly, if I have overlooked something please let me know.

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Old 03-25-2009, 05:31 AM   #2
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Welcome. Few questions: What size tires are you running? Auto or 5spd and what gears do you have? The mods you have listed will help, but its not going to turn the the Jeep into a race car.

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Old 03-25-2009, 05:47 AM   #3
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Are you trying to make it faster? Do you want an offroad vehicle set up or on road speed?
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Old 03-25-2009, 04:26 PM   #4
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Additional Information as requested

Thanks for your replies. The car is running stock wheel and tyres (sorry I don't know their size and rating) and it is an Auto trans.

I want to build in some speed and performance for street work....not offroad. Fuel efficiency is not a concern. I can run it on 98 octane if the engine mapping can benefit from it.

Thanks from downunder.................
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Old 03-25-2009, 04:33 PM   #5
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go downhill


sorry I couldn't resist
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Old 03-25-2009, 04:54 PM   #6
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With stock everything, the first thing and probably most cost effective is a simple intake system. shouldn't run you any more than $65 US. minus shipping. Maybe an aluminum radiator, but that might start getting pricey. Do u do much off roading? I spent a good amount of time in Australia and had a good time destroying a hummer in the The Shoalwater Bay Training Area...
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Old 03-25-2009, 05:48 PM   #7
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The 4.0L engine is a very old OHV design that is a torque monster that is EXCELLENT for offroad use as the Jeep Wrangler was made for, you are trying to change it into something it is not. It is not a high rpm engine that will benefit much by anything inexpensive as you are considering. It will also not run as efficiently at a cooler temperature, I would not go to a colder thermostat at all.

For faster street performance, I believe you'd be happier with a Japanese or German import.
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Old 03-25-2009, 10:01 PM   #8
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Smile Thanks

Thanks again to all who have contributed, even RatherBNmexico....I suppose I had that coming. To hulud44...no I am not a big offroader.....and anywhere in far North Queensland is good territory........especially with a cold beer in hand! Jerry, I am hearing you but boys will be boys. I just want it to go faster quicker......and no I am not turning Japanese or German. I love my Jeep......maybe I should drop in a V8?
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Old 03-25-2009, 10:23 PM   #9
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Change your gears, and keep stockish size tires should give it a bit more get up and go, 4.56's. Also you could add a turbo, or a supercharger.
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Old 03-25-2009, 11:59 PM   #10
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Old 03-26-2009, 03:56 AM   #11
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Sell your jeep and joind NASIOC.com. Don't worry, we'll still let you on here, you can hang out with us when you'd like, but you'd be happier with a WRX and a rally lift.


Oh, and if they're anything like they used to be, watch out for the NASIOC guys, they're pretty quik to judge.
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Old 03-26-2009, 09:54 AM   #12
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Sell your jeep and joind NASIOC.com. Don't worry, we'll still let you on here, you can hang out with us when you'd like, but you'd be happier with a WRX and a rally lift.


Oh, and if they're anything like they used to be, watch out for the NASIOC guys, they're pretty quik to judge.
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Old 03-26-2009, 01:00 PM   #13
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turn off overdrive if equipped. merging onto highways with o/d on is a pain in the a$$. talk about gutless!
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Old 03-26-2009, 07:59 PM   #14
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Originally Posted by ironman01 View Post
Thanks again to all who have contributed, even RatherBNmexico....I suppose I had that coming. To hulud44...no I am not a big offroader.....and anywhere in far North Queensland is good territory........especially with a cold beer in hand! Jerry, I am hearing you but boys will be boys. I just want it to go faster quicker......and no I am not turning Japanese or German. I love my Jeep......maybe I should drop in a V8?

That would be my suggestion. but getting a good american v-8 over to aussie land might not be the easiest or cheapest task.
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Old 03-26-2009, 08:07 PM   #15
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depending on how much your willing to spend.... this guy put an LS2 in his jeep and its fast as hell
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Old 03-27-2009, 02:33 AM   #16
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holy shit thats my goal

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