Good lift for 80MPH - JeepForum.com

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post #1 of 21 Old 07-16-2011, 07:17 AM Thread Starter
congerz83
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Good lift for 80MPH

I'm planning on lifting my ZJ with new springs and shocks. I'm torn between 3" coils and 4". I'm reading about how HWY driving can be affected by lifts. On the HWY I routinely drive 70-80MPH. Am I asking for trouble with 3"-4" coils? I also plan on going no bigger than 30" tires to put less stress on the axles. I guess my real question is, what is the best lift option to keep my ZJ reliable and maintain the ability to do 80MPH? I do not want to make the 4.0 work too hard.

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post #2 of 21 Old 07-16-2011, 07:20 AM
biggoofy
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for 30" tires do a 2" bb

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post #3 of 21 Old 07-16-2011, 07:37 AM Thread Starter
congerz83
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Quote:
Originally Posted by biggoofy View Post
for 30" tires do a 2" bb
I would consider running bigger tires. I just don't want to lose the highway driveability. I also don't want to rush my transmission and suspension into an early grave. Is the 2" BB the mest to maintain that, or are you basing that on the 30" tires I mentioned?

P.S. Will a 2" BB Level out the front?
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post #4 of 21 Old 07-16-2011, 07:46 AM Thread Starter
congerz83
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http://www.4wheelcustoms.com/Products.asp?Cat=1210
Ok looking back at previous threads it seems everyone suggests nothing bigger than 2" for highway travel. I'm thinking about the above kit with the Pro Comp ES3000 Shocks for a firmer ride than I have now. Will the 1/4 inch make that much of a difference? If you guys give me the ok, I'm gonna order this kit right away.
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post #5 of 21 Old 07-16-2011, 08:13 AM
Crasher
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I'm not sure what you are trying to accomplish, but keep in mind that lifting a ZJ any amount will decrease mpgs. Also going from a 28" tire to a 30" one will take away 7% of your power. Between a 2" lift and 30" tires, you will lose 10% of your power and probably reduce the mpg by the same amount. Does your 4.0 have an extra 10% to give up at 80 mph? Because of the increased angle of the control arms, the ride will be a little harsher too. These are just a few of the side effects of a lift and bigger tires.

You can see by my sig, which is the 4th Jeep I have built, what I run for mostly off road. As I went higher for offroad clearance, I slowed down. I rarely go over 60 mph and my mpg is down to 13-14 highway. It's wasn't hard for me to slow down, as I'm older now and don't feel the need to speed.

Sorry if this sounds like a sermon, but you need to be aware of the whole picture when you start to modify a ZJ. If you go ahead with it, do yourself a favor and slow down for your own safety. A sudden swerve at 80 mph in a lifted ZJ could ruin your day.

Good Luck

2005 LJ, 112" wb, RJ60's, ARB lockers, Fox Coil overs, 40" Creepies
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post #6 of 21 Old 07-16-2011, 08:18 AM
theskier74
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hey i know i have a WJ and this is ZJ, but either way i was looking into the same thing you are. i do highway to and from work, 80mph for 20 minutes straight then back roads(still going faster than i should be). I came to the conclusion that the 2 inch BB works the best for all this. My main concern was if i go high, the flip factor. I would say go with the 2 inch if you arent going to to all that much wheeling where you would need a higher lift.

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post #7 of 21 Old 07-16-2011, 08:19 AM Thread Starter
congerz83
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Quote:
Originally Posted by Crasher View Post
I'm not sure what you are trying to accomplish, but keep in mind that lifting a ZJ any amount will decrease mpgs. Also going from a 28" tire to a 30" one will take away 7% of your power. Between a 2" lift and 30" tires, you will lose 10% of your power and probably reduce the mpg by the same amount. Does your 4.0 have an extra 10% to give up at 80 mph? Because of the increased angle of the control arms, the ride will be a little harsher too. These are just a few of the side effects of a lift and bigger tires.

You can see by my sig, which is the 4th Jeep I have built, what I run for mostly off road. As I went higher for offroad clearance, I slowed down. I rarely go over 60 mph and my mpg is down to 13-14 highway. It's wasn't hard for me to slow down, as I'm older now and don't feel the need to speed.

Sorry if this sounds like a sermon, but you need to be aware of the whole picture when you start to modify a ZJ. If you go ahead with it, do yourself a favor and slow down for your own safety. A sudden swerve at 80 mph in a lifted ZJ could ruin your day.

Good Luck
Not sermon-like at all. I'm here for honest opinions and that's what I'm getting. What I'm trying to accomplish is a tighter ride and a more aggressive look. I do not off road. The biggest challange every winter is just getting up my driveway.
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post #8 of 21 Old 07-16-2011, 08:22 AM Thread Starter
congerz83
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I'm also thinking hard about the 2" coil kit instead of the "pucks". I figure with the coils, i'll get full advantage of a firmer ride.
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post #9 of 21 Old 07-16-2011, 09:19 AM
zander21510
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Everyone tells me I need a lift on my ZJ because it looks so squatty...the only reason its like that is because discount tire put 225/70/15s on it..I'm gonna try to put 235/75/15 BF goodrich all terrains on it cuz i've heard good reviews, its only around 1in higher that way but there's no lift involved since i will rarely if ever take my ZJ wheeling...i know probably a sin lol but I like it looking clean! Maybe on a camping trip or snowstorm it will come in handy lol.

Though I have read interesting things on trading the front springs to the rear and putting the front springs from a 5.2 on the front of my 4.0...opinions on that?
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post #10 of 21 Old 07-16-2011, 10:04 AM
speedbucket
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235/75 will fit stock easily

http://www.jeepforum.com/forum/f22/speedbuckets-zj-build-1361322/
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post #11 of 21 Old 07-16-2011, 10:29 AM Thread Starter
congerz83
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The 2" Coil/Shock kit from Fat Bob's comes with a rear track bar bracket. Do I need it?
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post #12 of 21 Old 07-16-2011, 10:51 AM
Crasher
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Quote:
Originally Posted by congerz83 View Post
The 2" Coil/Shock kit from Fat Bob's comes with a rear track bar bracket. Do I need it?
With just a 2" lift, the axles won't be off by much. It's kind of a "on the fence" deal. A 3" lift would need to be adjusted, but most don't bother with the 2". Most tracking bar relocation brackets for the rear will just break in time. Try it first. If you want to move the axles back to center, don't waste your money on brackets. Get adjustable track bars and do it right.

2005 LJ, 112" wb, RJ60's, ARB lockers, Fox Coil overs, 40" Creepies
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post #13 of 21 Old 07-16-2011, 12:37 PM
danegerousZJ25
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So no one recommends a dd with 32s? Just got my 98 zj. I planed to do a 4.5 lift for 32s. I live in north houston and just had plans for beach and trail duty till I get a car and have this on the side. So I should tone down my plans?
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post #14 of 21 Old 07-16-2011, 12:49 PM
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Quote:
Originally Posted by danegerousZJ25 View Post
So no one recommends a dd with 32s? Just got my 98 zj. I planed to do a 4.5 lift for 32s. I live in north houston and just had plans for beach and trail duty till I get a car and have this on the side. So I should tone down my plans?

Mines a DD and I'm getting ready to put a 3.5 inch lift with 1 inch spacers and 31s. But I guess I probably have less to worry about then you. My work is only a half mile from my house, and other than that I drive to school once a week (during the school year) and thats about 20 miles one way. Other than those 2 trips, I don't drive that much unless I got other stuff to do.

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'97 ZJ 4.0|3.5 RC|31" -SOLD
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post #15 of 21 Old 07-16-2011, 12:56 PM
sabzz
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With the 4.0 you're going to lose power, and there isn't a lot you can do to make it up. (unless of course you want to spend a lot of money) For me I'm going with a 3.5 inch RC lift, with 1 inch spacers to give me a little extra. I got a 97 4.0. I'm not really worried about power, even though on highway speeds I go 75-80. I'm putting on a custom intake though (even though it won't give me really any power) it will look good . I ordered a Spectre filter ($25) and a baby filter for the valve cover breather ($7). I'm going to get either some 3 or 3 1/2 inch pipe (deciding on exhaust or pvc) and then chop the stock air intake tube off before it bends the 90 and get a coupler, hook it up. It won't give me really any more power but hey theres nothing to lose!

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