raccoonradar
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| posted on 26/4/06 at 08:48 PM |
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bump steer
sure its been done before but causes it & how to stop it, its a book locost
I feel like pet detective ! If you have seen the film .
Cheers
Steve
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mookaloid
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| posted on 26/4/06 at 08:58 PM |
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Have a look at this thread
http://locostbuilders.co.uk/viewthread.php?tid=39053
Cheers
Mark
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JB
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| posted on 27/4/06 at 05:59 PM |
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Bumpsteer
Bumpsteer is where the tracking changes as the wheels move up and down.
Or if you move the wheel through its range of suspension it will steer.
It is caused by the track rod and suspension wishbones working on different arcs.
To cure it you first get the rack the correct length and at the correct hieght, then tweak it by altering the hieght of the track rod ends.
It is too complex to explain just how you design a system with no bump steer, but it is commonly described in suspension books.
John
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907
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| posted on 27/4/06 at 08:50 PM |
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Testing for bump steer involves eating loads of pies.....
and you end up with sore knees.
Paul G
 
Rescued attachment Bump-steer-test-s.jpg
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garage19
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| posted on 23/5/06 at 11:32 AM |
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Not sure i like your new bodywork paul!
Thats the funniest photo I've seen for a while.
If you had posted that without the bumpsteer explanaition people would have thought you had finally lost the plot!
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David Jenkins
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| posted on 23/5/06 at 11:52 AM |
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It's a caption competition!
David
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JB
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| posted on 23/5/06 at 03:47 PM |
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Easy Bump Steer Check
That is one of the easiest ways to check for bump steer, especially if you attach 2 pieces of wood or box section to the wheels pointing forwards to
amplify any bump steer.
John
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Peteff
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| posted on 23/5/06 at 04:55 PM |
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The new nosecone was an @rse to fit.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Peteff
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| posted on 23/5/06 at 05:20 PM |
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Joel asked about this a while back. I've never felt the effect you are talking about with my car. When I built it I had my own theory that the
track rods should be parallel to the bottom wishbones to help combat the bump and so I mounted it lower than the book measurement and my brackets also
set it a bit further forward.
 
Rescued attachment rackpos.jpg
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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