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post #1 of (permalink) Old 06-06-2004, 11:11 PM Thread Starter
 
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SOA Questions

So, a bit earlier my dad ( Posts here as OlllllllOCJ , for those of you at the bash, I was in the yellow CJ with the award winning tires. ) and I were having a discussion about the feasibility of going spring-over on my 84' CJ7... My main question is this:

Given that the pinion and steering angles were set up correctly and proper sway bars and whatnot were installed, is there any reason why an SOA set up would be any less stable/roadable as a daily driver and at highway speeds?
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post #2 of (permalink) Old 06-07-2004, 07:18 AM
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Re: SOA Questions

</font><blockquote><font class="small">In reply to:</font><hr />
is there
any reason why an SOA set up would be any less stable/roadable as a daily driver and at highway speeds?

[/ QUOTE ]

Yes. Anything that raises the center of gravity will reduce stability and increase sensitivity to crosswinds and off-camber roads.
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post #3 of (permalink) Old 06-07-2004, 10:58 AM Thread Starter
 
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Re: SOA Questions

Thanks for the reply. Though, I kinda meant as compared to other lift options that provide a similar amount of lift (like a set of lift springs set up spring-under like stock).

It was probably a dumb question.
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post #4 of (permalink) Old 06-07-2004, 11:09 AM
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Re: SOA Questions

If a SOA is done correctly and the steering angles are corrected. (hi steer, or equivelent) I think it whould be just as streetable as a SUA lift of 5-7"
However, doing a SOA correctly is a lot more labor intencive and $$ than putting a SUA on a Jeep, but that was not your question.
Bottom line is that a correctly build SOA will be just as streetable as a SUA lift of equal height.

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post #5 of (permalink) Old 06-07-2004, 11:12 AM
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Re: SOA Questions

There are no stupid questions. Only inquisitive idiots... [img]images/graemlins/grin.gif[/img]

Really. There are arguments back and forth about lifts, SOA vs. 4 inch springs... It really comes down to personal preference. If you have welding and fabbing skills and access to the tools, then a SOA might be cheaper. But if you don't have the skills and the tools, a spring lift will be easier.

The dangers of a lift (like Jim said) are increasing the COG. The Jeep will behave quite a bit different than it does at stock height... The way it acts, comparing a SOA and a spring lift will not be identical but similar.
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post #6 of (permalink) Old 06-07-2004, 01:09 PM
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Re: SOA Questions

It would seem that springs with that much lift would cause strange ride and handling characteristics. The geometry would suggest that they would be very stiff at normal ride height, where there is a lot of arch, and then get comparitvely softer as they compress and flatten out.

On the other hand, an SOA lift should have little or no affect on the spring rates.

I've ridden in a friends YJ with a 4" spring lift, and it's awfully bouncy. I would expect that a couple more inches to equal an SOA lift could get really weird.

But since I've never owned either, pay more attention to those who have.
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post #7 of (permalink) Old 06-07-2004, 03:59 PM
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Re: SOA Questions

Jim makes an exellent point. And I stand corrected.
If properly set up, and built corectly, I would bet (if I was a betting may) that a SOA would actually be a more enjoyable ride. Not so hard on the lower back.
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post #8 of (permalink) Old 06-07-2004, 10:24 PM
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Re: SOA Questions

4" lift SUA will allow the arch to rock slightly making the steering sloppy. I know. A SOA will have almost flat springs and won't rock side to side in the bushings greatly improving the steering.
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post #9 of (permalink) Old 06-08-2004, 01:29 AM Thread Starter
 
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Re: SOA Questions

I seem to remember reading somewhere that springs that ride flatter at normal ride height actually give better articulation because they aren't already flexed all the way one way... And so are free to move further in one direction.... (I probably didn't put that very well, but hopefully you get what I meant.) Any truth to that, or was it total BS?
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post #10 of (permalink) Old 06-08-2004, 09:44 AM
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Re: SOA Questions

A flat spring will move more easily into negative arch than a lift spring fighting against the natural arch of the spring necassary for the lift. Wow, that was clear as mud. [img]images/graemlins/grin.gif[/img]
Simply put, a spring that rides flat at normal ride height will move easily in both directions.
Also, with a SOA, the axles will have more leverage on the springs and move them further. You may need bumpstops or a sawsall. [img]images/graemlins/RockOn.gif[/img]
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