Flex; How much is really necessary? - JeepForum.com
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post #1 of 18 Old 02-04-2005, 08:23 AM Thread Starter
makizoo
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Flex; How much is really necessary?

I understand the concept of more flex allowing you to keep all 4 on the ground for added traction, and all the ramp shots are pretty impressive. But you drive up and back down. How does this help in the real off road world going forward? After you get the front tire on and over an obstacle, won't you still hang up on the frame, lower, control arm, or t-case skid, before the rear tire can get you over?

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post #2 of 18 Old 02-04-2005, 08:38 AM
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That way you need big tires and a wheel base that will fit your needs.... If you going to center your self by going straight…..Don’t... Go at an angle....

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post #3 of 18 Old 02-04-2005, 11:00 AM Thread Starter
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Figured that much, but then isn't just the tire size the most important? To close up the wheelbase, and lift only as required to squeeze in the tires? So the height of the lift becomes more important than its ability to articulate?
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post #4 of 18 Old 02-04-2005, 11:47 AM
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How much flex do you need? It depends.

I think largely it'll depend on on the terrain you want to run. Mud bogs or sand dunes and the like I would imagine wouldn't need as much articulation as, say, rock crawling with boulders the size of cars.

I've setup my Jeep with the goal of being able to run 95-97% of the trail miles in my state. I figure it's not worth the huge monetary investment to me to be able to conqure the last 3-5% of the trails. Sure, I might be missing out on some really gnarly stuff . . . but so is my wallet. And the compromises that are needed to get to that last little bit don't interest me. Jeeps are expensive enough without adding uncessary damage to repair into the mix.

That being said I find that for what I want to do the approx 30" of articulation I have is sufficient and pretty easy to achieve for a very moderate price.





I'm still impressed with what is essentially still a stock Jeep suspension. All that I've added to get to this point is a $200 BB, $70 BL, and the Anti-rock (though disconnects would work, too). Very good road manners and very good off-road prowess, too to yeild a good balance.

Oh, and if you're worried about dropping off the other side of an obstacle and messing up your tub . . . find a way to install some sturdy rocker guards.

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post #5 of 18 Old 02-09-2005, 12:47 AM
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Flex is over-rated. This is JUUUST about full stuff on my YJ, she's still got a bit more. I have a spot on each front fender that's dented up from the tires.


If you are locked up front and rear, having a ballanced suspention that keeps your rig planted firmly will get you much farther. I thing f/r weight ballance is more important then flex.

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post #6 of 18 Old 02-09-2005, 06:43 AM
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In my opinion, the only time you need a lot of flex if you do not have lockers. Lockers don't mind of one tire is in the air, but an open diff does.

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post #7 of 18 Old 02-09-2005, 07:20 AM
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Having all 4 tires on the ground is the key to traction and stability, one can never have too much flex. Just because one has lockers and they can pull if a tire is up doesn't mean that all you need to do is add lockers to a stock height SE and you can wheel almost anything.
Aws you can see, if I had more flex, I wouldn't have gotten tripped up here.(second picture adjusted for level)


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post #8 of 18 Old 02-09-2005, 07:26 AM
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I think the flex gives you a little better balance. Prior to these springs I ran stock ones. They didn't flex. I had more "tipping" issues.
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post #9 of 18 Old 02-09-2005, 10:41 AM
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Ooohhhh... love your '73 CJ5! I helped a good friend do a frame-up restoration of his and it turned out gorqeous. That year's flat instrument panel and the AMC 304 V8 some came with have me lusting after a '73 myself!

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post #10 of 18 Old 02-09-2005, 11:07 AM
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Quote:
Originally Posted by AudioGuru
Having all 4 tires on the ground is the key to traction and stability, one can never have too much flex. Just because one has lockers and they can pull if a tire is up doesn't mean that all you need to do is add lockers to a stock height SE and you can wheel almost anything.
Aws you can see, if I had more flex, I wouldn't have gotten tripped up here.(second picture adjusted for level)

You have more then enough flex for that situation. There are a few better lines I can see there that would have made it much easier. Too much flex can be bad, trust me. Sometimes it's an advantage to have more tire pressure on one tire, and alot of flex prevents this. Super flexy rigs are also very unstable unless they are VERY low. I'm not saying weld your axles to the frame, I'm just saying more then a well tuned suspesion system really doesn't help much offroad.

I second Jerry, that '5 is SEXY!!!

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post #11 of 18 Old 02-09-2005, 01:42 PM
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Quote:
Originally Posted by RideRed04
You have more then enough flex for that situation. There are a few better lines I can see there that would have made it much easier. Too much flex can be bad, trust me. Sometimes it's an advantage to have more tire pressure on one tire, and alot of flex prevents this. Super flexy rigs are also very unstable unless they are VERY low. I'm not saying weld your axles to the frame, I'm just saying more then a well tuned suspesion system really doesn't help much offroad.

I second Jerry, that '5 is SEXY!!!
Yes, there are better lines. But more flex would have helped. That's my point.
I was leading the group in unfamiliar territory without a spotter.

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post #12 of 18 Old 02-09-2005, 01:54 PM
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Quote:
Originally Posted by AudioGuru
Yes, there are better lines. But more flex would have helped. That's my point. I was leading the group in unfamiliar territory without a spotter.
Did you get through? Probably. There is never enough flex to keep all the tires on the ground at all times in all situations. If you know your flex capabilities, whatever they are, you pick lines that you can work with. I have less flex than you, manage to go everywhere I want, and rarely get tippy. Oh yeah, and in situations like you are in the pic, I always have a spotter to help pick the line more likely to keep 4 on the floor, or tell me all is well or not if less than 4.

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post #13 of 18 Old 02-09-2005, 01:59 PM
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That doesn't even look like you would really need a spotter there...just turn your wheels to the passenger side and let the jeep go into that crack. If I'm ever out with buddies and not sure, I'll just get out and walk around all the angles, sometimes there is a really obvious line that you can't see from the drivers seat.

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post #14 of 18 Old 02-10-2005, 05:55 AM
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post #15 of 18 Old 02-10-2005, 08:35 AM
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Quote:
Originally Posted by RideRed04
That doesn't even look like you would really need a spotter there...just turn your wheels to the passenger side and let the jeep go into that crack. If I'm ever out with buddies and not sure, I'll just get out and walk around all the angles, sometimes there is a really obvious line that you can't see from the drivers seat.
We were concerned that merely going right would cause a flop, since the weight was going to transfer quickly from driver's rear to passenger's front. We strapped back up the hill 1 foot and then I got the right line, it was cake after that. The crumbling bank didn't inspire much confidence, either.

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