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Old 10-15-2019, 08:28 PM
Kentguy13 Kentguy13 is offline
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Default Another steering problem... 👽

I received my front end set up and after putting the drivers side on my steering needs some help. When the suspension travels, the wheel moves. See the video.



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Old 10-15-2019, 08:32 PM
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Where the steering rack is supposed to pivot upward, needs to be align with the pivot of the a-arms. That will prevent bumpsteer (what you have).
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Old 10-15-2019, 08:56 PM
Kentguy13 Kentguy13 is offline
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Ok. I was afraid of that. Lol. Looks like I get to buy a third rack and pinion block. Is that my only option?
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Old 10-15-2019, 09:58 PM
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I don't know if you are going to find one that is short enough to fit in the center of the frame without protruding beyond the inner pivot point of the a arms.

Steering and suspension geometry can get really tricky, particularly when you're looking at a relatively long travel relative to the width of the suspension.
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Old 10-16-2019, 06:39 AM
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If you cannot find a shorter rack, your next best option will be to widen the frame where the a-arms are supported, out to where the rack will pivot upward inline with the a-arms.
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Old 10-16-2019, 07:51 AM
Kentguy13 Kentguy13 is offline
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Thank you all for pointing me in the right direction. I researched “bump steer” more last night and see what you’re referring to. I found a rack that is close, about an inch longer than ideal. I may try that first before having to fabricate a new front end.
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Old 11-04-2019, 09:12 AM
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So I extended the frame and bought a shorter steering rack. I have minimized the bump steer, but not eliminated it. Iím thinking what is remaining is due to the difference in angle between the A arms and the tie rods? If I elevate the steering rack so the tie rods are parallel to the A arms, will that help?
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Any thoughts on the wheel travel? I originally thought one had a sharper radius than the other, but it may just be an illusion.
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Old 04-30-2020, 08:44 PM
Kentguy13 Kentguy13 is offline
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Default At it again.

Well I cut the entire front end off today and started fabrication on a new one. Hopefully with a better understanding of bump steer and Ackermann.

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Old 05-01-2020, 04:06 PM
70Cobra 70Cobra is offline
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The tie rods do have to be parallel to the A arms, or as close to it.
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Old 05-01-2020, 04:29 PM
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I am a big fan for offroad of equal length and equal spacing (vertical ) a-arms that way you have no camber changes, for bump steer the tie rods need to be same length and same pivot points...no of course on road w/o the slippage...this would be crappy...BUT you could do some serious 3 wheel action with enough power
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  #11  
Old 06-23-2020, 09:13 AM
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Iíve been really slow on this project 😢. Here is some work I did yesterday.

The A-arms are the same length, but the calipers have an offset built into them, so I made the top frame rail larger in order to keep the A arms the same.
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Old 07-08-2020, 01:28 PM
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Quote:
Originally Posted by Kentguy13 View Post
Attachment 120691 Attachment 120692

Iíve been really slow on this project 😢. Here is some work I did yesterday.

The A-arms are the same length, but the calipers have an offset built into them, so I made the top frame rail larger in order to keep the A arms the same.
Hey mate. I'm having the same problem as you. Have this helped you at all?
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