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Unread 05-24-2006, 07:38 PM   #1
spitfirees20
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Street Jeep Buildup

Alright, well after 8 months of hard work, it's finally almost done! I have been building a street jeep, just to see what it could do. Here are my stock specs:

1989 Jeep Cherokee Laredo
4wd
4 Door
5 speed (AX-15 maybe)

I was given the jeep and 2 4.0L renix engines from my dad, and we decided to build one of them up. The one that came out of the jeep had 130,000 miles on it, so we started with that engine. We tore it down, and did a fresh rebuild. Hone the block, clean everything, new gaskets, piston rings, reground crank, a typical rebuild. Then I decided to get some stuff for more power Here are some of those things:

- Ported/polished the stock renix head
- Had the head shaved for a higher compression ratio
- Artsound bored throttle body
- Fram Air Hog Filter / Modified Stock Air Box
- 274/280 Erson Camshaft

These I have started but are yet to finish:

Update: These are all finished

- Modified stock air box
- Daytona Turbo 500 Muffler
- Custom bent s-pipe
- Hi flow cat
- Map sensor

Here's a quick rundown of how the engine installation went:

may 18, 2006: Got the engine hooked up, no sensors or vaccums hooked up... started up for a second, ran awful, then died
may 20, 2006: Hooked up all of the sensors and vaccum lines, started it up. It ran awful, wouldn't rev past about 1,800 rpms. The gears wouldn't really pull except fifth. To give you an idea of how bad we're talking, we took it out on the road. We raced a lady in the jeep up a hill... she won... she was walking
may 23, 2006: Lined up the distributor, hooked up a diagnostics tool to the computer, set the sensors, and finally found the problem: a clogged catalitic converter. It was sitting for awhile, and everything inside broke apart. We just took everything in the exaust from the s-pipe back off.
may 24, 2006: Test drove the jeep, drove it home, started installing the stereo

So that's where I am as of today. I did the first real test drive today, and with only the s-pipe and no cat/muffler, this thing is loud. It pulls pretty darn good, I really need to get the other mods done and get an exaust system on it to test it out though. I'll keep you guys updated, tell me what you think / potential quarter mile times. Thanks!


Last edited by spitfirees20; 06-04-2006 at 10:20 PM..
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Unread 05-24-2006, 11:13 PM   #2
XJ4oh
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1997 XJ Cherokee 
 
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Sweet. Why didnt you go the stroker route while it was torn down?
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'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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Unread 05-24-2006, 11:21 PM   #3
Rock Kustoms
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yeah honestly man, you made a 19 second jeep into a high 17/low 18 second jeep....

unless you mean street jeep as in daily driver, then awesome, nice, reliable jeep
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Unread 05-25-2006, 07:04 PM   #4
n20jeep
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1993 XJ Cherokee 
 
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good work so far....
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Unread 05-25-2006, 07:35 PM   #5
MidnightRacer
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It's a nice start...Why did you not put a stroker in it while you had it tore apart???
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Unread 05-26-2006, 08:00 AM   #6
spitfirees20
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My dad had already bought the reground crank and said no on the stroker... and low 18 second jeep? I hope you're joking. I don't get how you regard the HO as so much better than the renix... do you know how easy it is to trick the renix computer? It also had extensive headwork done. Besides, this thing pulls hard, and I have a low 16 second grand marquis that it can beat, so it's not pulling low 18's / high 17's.
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Unread 05-26-2006, 12:19 PM   #7
XJ4oh
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Quote:
Originally Posted by spitfirees20
so it's not pulling low 18's / high 17's.

I agree on that. If youve got headwork done to it, a cam, intake and exhaust mods I dont think theres any way itd be that slow. The gap between non-HO and HO 4.0's is only like 13 hp or so, easily made up with the work you have done.
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'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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Unread 05-26-2006, 01:44 PM   #8
spitfirees20
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Quote:
Originally Posted by XJ4oh
I agree on that. If youve got headwork done to it, a cam, intake and exhaust mods I dont think theres any way itd be that slow. The gap between non-HO and HO 4.0's is only like 13 hp or so, easily made up with the work you have done.
Thanks for backing me up, I figure that. My grand marquis weights close to 4,000 pounds, has 190 horsepower stock, and has an automatic 4 speed transmission, and runs 16's all day long. He's trying to tell me that my jeep, which probably weights 3,300 to 3,400 pounds, has well over 200 horsepower, plenty of torque, and a 5 speed manual transmission, is going to run over a full second slower than that... Some people, it's funny. If you don't have any experience with it, I prefer you don't pollute my thread and all of the hard work I've done.
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Unread 05-26-2006, 05:28 PM   #9
n20jeep
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1993 XJ Cherokee 
 
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personally in my own experience.....ive had 3 different xjs....2 of them had the renix (my 89, and 90)...and the newest one has the H.O...(93) and i think stock for stock the renix has alot more *** down low than the H.0.
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Unread 05-26-2006, 06:41 PM   #10
Fast Kawasaki
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with being fairly light, and having head work (shaved head=big plus), you're probably looking at a solid 15. Regear it, put limited slip in the back and reconfigure the computer and you may hit low 15s maybe even high 14s
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Unread 05-26-2006, 08:49 PM   #11
Rock Kustoms
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youre hysterical....first of all you didnt mention the head work

secondly, have you seen my build up thread???

as far as the head work, what have you done....theres no way your hitting 15's. maybe with a ported head, and a good valve job youll get into the 16's

dr dyno and i have strokers, with ported heads, both HO motors, (mines running off renix) his best track time is mid-high 14's
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Unread 05-26-2006, 10:06 PM   #12
XJ4oh
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Quote:
Originally Posted by tealcherokee
youre hysterical....first of all you didnt mention the head work

secondly, have you seen my build up thread???

as far as the head work, what have you done....theres no way your hitting 15's. maybe with a ported head, and a good valve job youll get into the 16's

dr dyno and i have strokers, with ported heads, both HO motors, (mines running off renix) his best track time is mid-high 14's


Dude im not tryin to call you out or anything, so no disrespect... but...

In his first post he said that he had the head ported/polished and shaved for more compression.

Everyone has seen your thread, and I garuntee you its sparked quite a few people into modding their 4.0's...

I dont see why 15's arent possible, if hes faster than that low 16 second Crown Vic, than hes either running high 15's or right around 16. Being a 5 speed helps him out also.

Dr. Dyno, aka Dino ran a 14.3x as his best time so far. Thats low 14's there. Thats almost a full 2 seconds faster than what spitfirees20 is claiming, definatly shows the extra work in his engine. Then again, the only thing spitfire is missing is the bottom end work.

Again, not trying to call you out or insult you, but I dont think you should be ragging on this guy for what he and his dad just proudly did themself.
__________________
'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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Unread 05-26-2006, 10:41 PM   #13
spitfirees20
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Quote:
Originally Posted by XJ4oh
Dude im not tryin to call you out or anything, so no disrespect... but...

In his first post he said that he had the head ported/polished and shaved for more compression.

Everyone has seen your thread, and I garuntee you its sparked quite a few people into modding their 4.0's...

I dont see why 15's arent possible, if hes faster than that low 16 second Crown Vic, than hes either running high 15's or right around 16. Being a 5 speed helps him out also.

Dr. Dyno, aka Dino ran a 14.3x as his best time so far. Thats low 14's there. Thats almost a full 2 seconds faster than what spitfirees20 is claiming, definatly shows the extra work in his engine. Then again, the only thing spitfire is missing is the bottom end work.

Again, not trying to call you out or insult you, but I dont think you should be ragging on this guy for what he and his dad just proudly did themself.

Exactlly, thank you for that. Dino's site is where I got almost all of my info from, and I've done almost everything that he has done sans the stroker. He's running a 14.3, and somehow I can barley break in the 16's? Honestly, that makes no sense at all. I'm still working on mine, but i'm hoping for a solid 15, and I know that's possible. If you say otherwise, you're defying logic, and you're just wrong.
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Unread 05-26-2006, 10:43 PM   #14
XJ4oh
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Quote:
Originally Posted by spitfirees20
Exactlly, thank you for that.
__________________
'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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Unread 05-26-2006, 10:56 PM   #15
Rock Kustoms
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i missed the part about the port and polish, that helps alot....

take it to the track, post the slip, i bet 16.00+

honestly, my girls beetle, is lighter, more aerodynamic, and geared better, it runs a 15.6, and has 181 hp at the wheels, you prolly have around 160-175 wheel horse
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