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Unread 11-29-2008, 09:27 AM   #1
JrMechanic
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Should it be THIS slow?

Alright alright, I know its not a car, it has low end torque, and isn't made for speed... But now that the steering is taken care of, I got on it a little. 20-50 isn't bad, but 50-60 is slow, 60-70 is excruciating, and 70-80 is non existent. Once it hit 70 it seemed like it almost just plain stopped accelerating and just kinda hummed. Is it just my 3:55's, or does the I6 lack that much top end?

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Unread 11-29-2008, 09:43 AM   #2
93gc40
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Let's see, its a 4000lb 4WD suv with a 190hp 6cyl motor, oversized tires, and 3.55 gears. No they are not drag racing vehicles, mine will do over 100mph, but it takes a week to buildup the mometum. Yes the I6 has zero top end. Thats why you have the Z28. Your performance sounds a little sluggish, try a tune-up, check compression.
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Unread 11-29-2008, 09:44 AM   #3
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I have no problem gettin my 93 I6 on 31s and 3.55s over 90, though it's not a comfortable sensation, knowing a strong cross-wind could take me out. Never had the guts to fully top it out, but have no doubt it could easily do 105-110 or more...
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Unread 11-29-2008, 09:50 AM   #4
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Yall are crazzzy to go that fast.

I havent taken the buggy over 65 ever. And usually I dont go over 50.

V8s a different story tho.

Try doing a full tuneup, run some Engine Restore, and see how that goes.
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Unread 11-29-2008, 09:51 AM   #5
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Quote:
Originally Posted by 93gc40 View Post
Let's see, its a 4000lb 4WD suv with a 190hp 6cyl motor, oversized tires, and 3.55 gears. No they are not drag racing vehicles, mine will do over 100mph, but it takes a week to buildup the mometum. Yes the I6 has zero top end. Thats why you have the Z28. Your performance sounds a little sluggish, try a tune-up, check compression.
Thats what I stated first in my post. I just think I should be able to get up to highway speeds easier than that. Ignition system is good, and compression is also good.

Im wondering if it's because my cat is going bad? I don't think its plugged, but it has a rotten egg smell. Could it be contribution to the problem?

One more thing, whats the diameter of the cat, in and out?
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Unread 11-29-2008, 09:55 AM   #6
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A clogged Cat can deff bog down an engine. Try ordering one off Ebay and replacing it. Or to try it out. . .On bolt the cat and see how it does.


"Temporarily" only of course.
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Unread 11-29-2008, 10:01 AM   #7
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If you can smell the cat like that, there's a strong chance that's your problem.
A restricted exhaust sucks your HP in a big way...
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Unread 11-29-2008, 10:12 AM   #8
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Well, whats the diameter of the cat? I'll go get a cheap flex pipe to put in place and see if it helps any.
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Unread 11-29-2008, 10:24 AM   #9
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I believe the cat is 2.5" in / 2.25" out. Not positive though on the I6.

If it's the stock cat, get rid of it for sure. The factory cats don't flow well to begin with and clog up even more after time. Maybe it's time to buck up and get a cat-n-back from Kolak.
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Unread 11-29-2008, 10:40 AM   #10
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No emissions requirements where I live, so I am not planning on dropping big bucks for a high flow cat on a 16 year old vehicle when I don't even need it. It had a new cat back put on it about 8,000 miles ago, but its going bad again.

So is it def. 2.5 in and 2.25 out? If thats the case, would I be able to just use a flex pipe?
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Unread 11-29-2008, 10:42 AM   #11
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My 4.0 accelerates nicely when I need to do so. Stock air intake, nothing special about exhaust.. Just a ton of miles on it.

I am sure you can find a non-jeep engine to fit in there..
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Unread 11-29-2008, 10:56 AM   #12
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Quote:
Originally Posted by JrMechanic View Post
No emissions requirements where I live, so I am not planning on dropping big bucks for a high flow cat on a 16 year old vehicle when I don't even need it. It had a new cat back put on it about 8,000 miles ago, but its going bad again.

So is it def. 2.5 in and 2.25 out? If thats the case, would I be able to just use a flex pipe?
How do you know the cat is going bad?

You can't remove the cat legally Plus when you are crawling offroad, you are the one that benefits from it. And at 8000 miles, it's probably still like new anyways. You can have it checked at a muffler shop.
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Unread 11-29-2008, 11:41 AM   #13
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Should've got a V8...

Quote:
Originally Posted by five.nein View Post
How do you know the cat is going bad?

You can't remove the cat legally Plus when you are crawling offroad, you are the one that benefits from it. And at 8000 miles, it's probably still like new anyways. You can have it checked at a muffler shop.
Good point. I really doubt it's your cat. Unless you've been running too rich for way too long.
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Unread 11-29-2008, 12:20 PM   #14
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A cat-back generally means from BEHIND the cat, and back....usually does not include a new cat.....so yes, it could easilly be a bad cat at that milage.
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Unread 11-29-2008, 12:38 PM   #15
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This is why I sold my 4.0L and got a 5.9L, not enough power.
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