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Old 07-16-2007, 11:32 PM   #1
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Doing research on TJ performance mods...

I have been looking at TJ's as a fun vehicle while I wait for the Challenger. But I know I would need to make some upgrades off the bat to make one perform to my liking.

The first thing I noticed was that the Kenne Bell is listed as being 00-04...

What's different 05+ about the engine - I'm not really interested in anything pre 03, but what changed in 00 as well? (4.0L)

I noticed there's a turbo kit out for the new JK's... but they're still deadly slow even with that.

EDIT: I emailed Kenne Bell asking them... but that was over a week ago and no response.

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Old 07-16-2007, 11:35 PM   #2
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In 2000 the TJ received a coil-on plug ignition system... donno what changed in 05 though.

JK's slow?

But why spend that much on a TJ? Its not how fast they go, its about the trip they take ya on!

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Old 07-16-2007, 11:36 PM   #3
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The 4.0 Jeep engine is designed to produce tons of torque, it's not a vehicle I would try to make go fast. And the best thing to do if you want speed is to replace the 4.0 and drop in a Chevy 350 or even a hemi.

Wait for the challenger if you a fast car, the Jeep is great for everything else.
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Old 07-16-2007, 11:37 PM   #4
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AzTJ why do you always beat me to everything!? LOL
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Old 07-16-2007, 11:39 PM   #5
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Because I'm the helpful troll
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Old 07-16-2007, 11:41 PM   #6
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You hate me... That's fine. I'll be the smart guy one day, just you see...
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Old 07-17-2007, 12:43 AM   #7
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Quote:
Originally Posted by GS_Geoff View Post
I noticed there's a turbo kit out for the new JK's... but they're still deadly slow even with that.
Well I'd beg to differ on this point with you. I know this by experience. Both in driving the JK and racing one also. A JK on 37 inch Krawlers wrapped around Walkers with an auto and 4.10's smoked my TJ on 35's with an auto and 3.73's from a dead stop. There is more than enough power in the 3.8.
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Old 07-17-2007, 02:09 AM   #8
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Quote:
Originally Posted by GS_Geoff View Post
I have been looking at TJ's as a fun vehicle while I wait for the Challenger. But I know I would need to make some upgrades off the bat to make one perform to my liking.

The first thing I noticed was that the Kenne Bell is listed as being 00-04...

What's different 05+ about the engine - I'm not really interested in anything pre 03, but what changed in 00 as well? (4.0L)

I noticed there's a turbo kit out for the new JK's... but they're still deadly slow even with that.

EDIT: I emailed Kenne Bell asking them... but that was over a week ago and no response.
Have you actually driven a Wrangler with a 4.0?
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Old 07-17-2007, 07:28 AM   #9
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dont bother with kenne bell, i already got a response from them. they do not have the kit for later than the 04. the computers changed and they do not have a way to tune the later tjs, thats basically what they told me. also, i think if you are worried about going fast you are looking at the wrong vehicle. but, if you want more power DO NOT PUT A TURBO ON IT! think about it like this, what do turbos need? rpms! what do jeeps operate at, mostly? low rpms! so a turbo is a real bad idea for trails, or crawling, anything where slow is good. unless you are building a tj for the highway put a supercharger on it! it will add to your already large amount of low end, what jeeps are all about. check out avenger, they make a kit that they say achieves 100 hp on only 4-5 lbs of boost.
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Old 07-17-2007, 08:26 AM   #10
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Originally Posted by AzTJ View Post
But why spend that much on a TJ? Its not how fast they go, its about the trip they take ya on!
+1
I just came from having a 2005 Mustang GT that I had alot of upgrades on, to driving a Unlimited.... I dont miss the mustang at all. Hell ya it was faster than hell after I put about 4k in it. lol
Dont get me wrong I loved my mustang, but I absolutely have the "bug" with my Jeep though... I would much rather drive my jeep than haul ass in the stang
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Old 07-17-2007, 03:38 PM   #11
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Thanks for the RE's guys. I know what I'm doing when I say I want forced induction. Current daily driver is supercharged

But I don't have anything particularly great for the snow. So a Jeep wouldn't hurt. My friend has an 03 4.0L, I haven't driven it though.

I have seen mag articles way back where they did a head swap and headers on the 4.0 and made killer torque. Take that and add a supercharger... mmm.

I say the JK is slow because the listed 0-60 is 10.5 for the 3.8L, and the one FI kit I saw knocked that down to 9.5 seconds. That's scary slow.

Current daily is more like 4.5 0-60.

I know it's not a drag car, but I need some speed... too used to it now!

Besides, I'd rather have an inline than a vee.

But I dunno, maybe I could be happy with just head swap, header, and maybe a cam.

Good stuff to think about, thanks guys!
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Old 07-17-2007, 04:16 PM   #12
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Quote:
Originally Posted by RedWrangX View Post
dont bother with kenne bell, i already got a response from them. they do not have the kit for later than the 04. the computers changed and they do not have a way to tune the later tjs, thats basically what they told me. also, i think if you are worried about going fast you are looking at the wrong vehicle. but, if you want more power DO NOT PUT A TURBO ON IT! think about it like this, what do turbos need? rpms! what do jeeps operate at, mostly? low rpms! so a turbo is a real bad idea for trails, or crawling, anything where slow is good. unless you are building a tj for the highway put a supercharger on it! it will add to your already large amount of low end, what jeeps are all about. check out avenger, they make a kit that they say achieves 100 hp on only 4-5 lbs of boost.

UMM..I BEG to differ with you on the fact that you cant make boost at low rpms...it all depends on the the size of the turbo and the .AR ratio...i can put a turbo on a jeep (and I WILL eventually) that makes 1 psi at 500rpm and 8psi at 1200rpm....all depends and the turbo size, intake, exhaust flow fuel ratio..and about 50 other things you NEVER want to have to worry about!!! i have a full standalone (laptop setup) in my turboed 97 hyundai making 320hp at 18psi...but THATS a different story....pretty much these engines are PERFECT for boosting, there bulletproofed for the factory! just dont know how the engine computer would react
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Old 07-17-2007, 05:24 PM   #13
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just dont know how the engine computer would react
It's going to try and dump fuel in there when you are idling and will piss you off. That's why any chance of SC or TB a 4.0 properly is going to need an inline module for the computer.
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Old 07-17-2007, 05:32 PM   #14
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piggyback ECU's are a lot more friendly and easier to program anyway. Did the same thing on a friends non-turbo Supra after slapping a 16G on it
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Old 07-17-2007, 05:48 PM   #15
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Here is the proof about a 4.0's torque curve. I ran it at the strip once as a joke. I beat a Hemi Dodge Truck to the 60 foot mark and then he raped me.

And about going fast, its about enjoying the drive, I would rather do speed limit or 5 over, save the gas and spend a few more minutes in my Wrangler instead of in work or the grocery store. Its the same thing I been saying to these guys buying Mooneys and Cirruses... If you enjoy flying so much why go stupid fast and get out of the plane sooner??

By the way 4.0 automatic--16.8 at 87 in the 1/4
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Old 07-17-2007, 06:10 PM   #16
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Quote:
Originally Posted by 04blackunlimited View Post
+1
I just came from having a 2005 Mustang GT that I had alot of upgrades on, to driving a Unlimited.... I dont miss the mustang at all. Hell ya it was faster than hell after I put about 4k in it. lol
Dont get me wrong I loved my mustang, but I absolutely have the "bug" with my Jeep though... I would much rather drive my jeep than haul ass in the stang
I sold my Mustang Cobra w/ $6k in mods I did myself, the Jeep is stock and still more fun!
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Old 07-17-2007, 07:06 PM   #17
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Quote:
Originally Posted by GS_Geoff View Post
...My friend has an 03 4.0L, I haven't driven it though....
I would at the very LEAST drive one before coming to the conclusion that it will need engine mods. Also, if you REALLY want more power out of your inline 6, call Hesco motors. They can stroke out that 4.0 and have it pushing 300HP and 330Ft of torque. One of their stroker engines in a crate, to your door, around 5300. Which is about what a supercharger would run you. The best part about a stroker is that you don't have to alter your computer or your emissions.
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Old 07-17-2007, 07:24 PM   #18
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I would at the very LEAST drive one before coming to the conclusion that it will need engine mods. Also, if you REALLY want more power out of your inline 6, call Hesco motors. They can stroke out that 4.0 and have it pushing 300HP and 330Ft of torque. One of their stroker engines in a crate, to your door, around 5300. Which is about what a supercharger would run you. The best part about a stroker is that you don't have to alter your computer or your emissions.
I'll second that one. In a few years, stroker is definitely how I will be going.
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Old 07-17-2007, 09:15 PM   #19
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im deff. going stroker if my engine ever dies on me

My friend keeps telling me to let hiim reprogram my comp. and Ill see a HUGE diff. but I dont want to loose the little gas milage i hardly have now...has anyone reprogramed there comp. or chipped them?
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Old 07-17-2007, 09:25 PM   #20
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WOW! That stroker kit looks nice. But my baby only has 4030 miles on her.
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Old 07-31-2007, 10:08 AM   #21
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how much do those stroker kits run? all i could find on their site is crate engines.
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Old 07-31-2007, 02:33 PM   #22
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Most of them are offered as long blocks... I havn't seen many kits for just the internals.

I'd like Golen's 230Hp 4.0L though
http://www.golenengineservice.com/ht..._off-road.html

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