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Unread 01-22-2003, 08:17 PM   #1
eastwood
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Engine performance upgrades

all right, i did some research and have learned that replacing the engine from 4cyl to 6cyl will take alot of work and have found that adding/modifying a few things might be an easier choice. what kind of modifications are suggested? i would like to get more power of that little bad boy. also, typicaly how many miles, with proper maintenence, should i expect before my engine takes a dump. i once had a honda CRX with over 200,000 miles on it and it ran as strong as the day i bough it. i sold it to buy my jeep

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Unread 01-22-2003, 09:39 PM   #2
balloo93
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I've read somewhere about swapping in a 4 litre throttle body!?!?!

Tri-County gear makes an enertia ring that will give you more even torque in offroad situations. Might be worth looking into.
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Unread 01-22-2003, 10:39 PM   #3
hjeepxj
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I second the 4.0 tb, have it bored to 60 mm first...also get a tbi spacer and bore it to 62mm, then get 8mm wires, splitfire plugs, new cap/rotor, ase (?) chip, header, 2 1/4" exhaust all the way back...
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Unread 01-22-2003, 10:40 PM   #4
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here is the complete list:

1. Cold air intake with 5" Powerstack cone filter
2. 4.0 TB with taper bored to 60mm
3. Poweraid TB spacer bored to 60mm
4. Intake manifold heatshield
5. Flowmaster 50 series 2.25" muffler
6. High-flow cat
7. Clifford Performance header with 2.25" piping
8. Champion copper plugs
9. Magnecor 8.5mm plug wires
10. Electric fan conversion
11. Speedtweaks IAT adjuster

With the package of mods listed above, output should improve by 20% to about 145hp.
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Unread 01-22-2003, 11:02 PM   #5
eastwood
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hjeepxj,

what kinda price am i looking for all that stuff? and what other changes is it going to make to my jeep?
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Unread 01-23-2003, 12:43 AM   #6
hjeepxj
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Quote:
Originally posted by eastwood
hjeepxj,

what kinda price am i looking for all that stuff? and what other changes is it going to make to my jeep?
it bolts right in...the tb can be found from the junkyard, for like 25, you can probably get it bored for 20 at a local machine shop, you go custom for the intake: 40, tb spacer, contact "bryman" on JU, hell hook you up with one for 30, muffler: 60, full custom exhaust, 300, ignition: 100, speedtweaks iat adj, 35, e fan, from a junkyard???
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Unread 01-23-2003, 07:24 AM   #7
4x4 XJ
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But doesn't the TB spacer have a helix bore in the center? If you bore it to 60mm wouldn't it be flat and have really no purpose of being there? And where can you get once for $30 you say??
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Unread 01-23-2003, 01:39 PM   #8
hjeepxj
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Quote:
Originally posted by 4x4 XJ
But doesn't the TB spacer have a helix bore in the center? If you bore it to 60mm wouldn't it be flat and have really no purpose of being there? And where can you get once for $30 you say??

ohhhh man...it begins

the "helix" bore doenst do anything! its the higher plenum volume that gives th hp...

are yo a member on ju? if you are pm "bryman" and ask him about his tb spacers...
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Unread 01-23-2003, 06:00 PM   #9
4x4 XJ
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Oh ok sorry man, just asking about the helix bore. New to the Jeep scene and learning everyday. I knew the height made the power but I was also thinking the helix helped. Now I know it doesn't. What exactly is "ju"? If you can, link please...Thanks for the info.
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Unread 01-23-2003, 08:55 PM   #10
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Quote:
Originally posted by 4x4 XJ
Oh ok sorry man, just asking about the helix bore. New to the Jeep scene and learning everyday. I knew the height made the power but I was also thinking the helix helped. Now I know it doesn't. What exactly is "ju"? If you can, link please...Thanks for the info.
no need to apoligize...i was just saying, didnt mean to sound like an a hole...

JU is jeepsunlimited.com check it out, see yah there
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Unread 01-23-2003, 09:15 PM   #11
4x4 XJ
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Thanks man.
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Unread 01-24-2003, 12:16 AM   #12
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Quote:
Originally posted by 4x4 XJ
Thanks man.
no problem

oh yeah, the speedfreaks forum there will help you good
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Unread 01-24-2003, 06:56 AM   #13
4x4 XJ
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Where do you register for the forums? I cklick on the forum link and it sends me back to pick a category (XJ, WJ, YJ, etc...)
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Unread 01-24-2003, 08:37 AM   #14
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Quote:
Originally posted by 4x4 XJ
Where do you register for the forums? I cklick on the forum link and it sends me back to pick a category (XJ, WJ, YJ, etc...)
im not sure, its almost been 2 years since i registered over there

its some where on there...
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Unread 01-24-2003, 10:35 AM   #15
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I just bought a 97 TJ with a 2.5 and am doing the following to upgrade performance:

borla cat-back exhaust
Airaid intake
MSD Ignition 6a
MSD blaster coil
7.5mm wire set

I considered the TBS but read somewhere that they were unproved and a waste of money. Maybe with the 4.0's TB, maybe that all would work?

So far, just the Airaid intake has made a noticible improvement on HP. Borla should arrive this weekend, and I'm installing the MSD stuff this weekend also. Am considering replacing the cat with a high-flow at the time of the borla install. What do you guys think?
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