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post #1 of (permalink) Old 12-26-2000, 03:37 PM
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Bumpsteer?

Ok, I have a question for everyone. I was once told that the only stupid question is the one not asked. So here it goes. What is Bumpsteer? Where does it come from/what causes it? And how do you keep it from happening or get rid of it?

Eric

Turn it till it breaks, then back off 1/4 turn
1986 Suzuki Samurai JX
2000 Suzuki Esteem seats
2" Calmini S/R
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post #2 of (permalink) Old 12-26-2000, 06:29 PM
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Re: Bumpsteer?

Isn't it like driving by braile? Trying to stay to the right of the little bumps in the middle of the road...
Actually it is when the front tires hit or roll over an obstruction (rock, ditch, rut, et.) and try to turn from the course you are steering. This deviation (resulting from the "bump") is transmitted through the steering linkage to the steering wheel and then into the driver's arms. Any slop in the linkage can increase the bump felt by the driver due to the ability of the linkage to "get some speed" while taking up the slack. BAD JU-JU for driver's arms. Some methods that have been used in the past (and today) to prevent this or lessen the effects are:
Steering Stabilizers- works like a shock absorber and slows the movement
Power Steering- Hydraulic components prevent the wheels from kicking back and give the driver a definate mechanical advantage
Hydraulic Steering- Use a ram from a forklift and you can actually push the front end of the vehicle sideways by placing the front wheel against a rock and turning the steering wheel. Not legal on highway.
Probably a few I can't think of right now. If you can remember my old tan 4X4 you can guess some of the crap I went through to make the stupid thing go straight. 44" tires have a mind of their own when you can put the horses to them.
Earl

'99 F-350 Dually
Lookin' for a Sammy
I'm not stuck! I just need to give it more gas...
post #3 of (permalink) Old 12-26-2000, 07:05 PM
 
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Re: Bumpsteer?

As the vehicle raises away from the axle via suspension lift, you begin increasing the upward angle of the drag link to the pitman arm. The more this angle increases, the more leverage a bump has on the drag link, and more jerk or spin to the steering wheel. Drop pitman arms, drop drag links (or Z-Link as some call it), crossover steering, all try to return the drag link to a more level state as it was before the suspension lift. All have varying degrees of success, and depends a lot on the individual lift. Hold a pencil level between your fingers and work one end up an down. You won't really feel anything in the other end. Hold that same pencil at an angle, shove up on it while holding the other end fixed, and you will feel it. Similar to when you were a kid and stuck your elbow with arm bent against someones chest, and took the other hand and smacked into the other clinched fist. OUCH!

TGT - NCO

www.northcoastoffroad.com
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