Roll Centres

Old 07-30-2007, 12:11 PM
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Originally Posted by adamge View Post
This?
yup thanks
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Old 07-30-2007, 10:37 PM
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Originally Posted by adamge View Post
Upper arm length controls camber gain as the suspension compresses. A short upper arm will force the top of the hub to stay be pulled in a lot when the suspension compresses. Pulled in = more camber.
To make things more complicated upper link length also effects the height of the roll center as the chassis rolls and the suspension is compressed. A shorter link will shorten the roll moment with compression of the suspension while a longer link will keep it closer to the same. This effects how the car reacts in the beginning, middle and end of the turn.
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Old 07-30-2007, 11:09 PM
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Ah, yes, migrating roll centers. Good luck!

Here's another two sites I find quite helpful.
http://www.hobbytalk.com/bbs1/archiv...69619-p-3.html <-- great for explaining what roll centers do, though it's in the context of a 12'th scale pod car.
http://users.pandora.be/elvo/ <-- especially for shocks
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Old 07-31-2007, 02:50 PM
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I think the poor guy that started this threads head has exploded..lol...Keep in mind roll center is not a save all for poor handling, very helpfull, yes, it is that, but if there not a good balance on the car, then it wont help as much.....my .02
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Old 07-31-2007, 02:56 PM
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Originally Posted by convikt View Post
I think the poor guy that started this threads head has exploded..lol...Keep in mind roll center is not a save all for poor handling, very helpfull, yes, it is that, but if there not a good balance on the car, then it wont help as much.....my .02

just a general statement, not directed towards anyones intelligence.
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Old 07-31-2007, 03:54 PM
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Originally Posted by John Malin View Post
Google "Milliken Research Associates" get their book call racecar vehicle dynamics. It will explain everything in great detail. Hard reading but worth the effort. Second really good reference source would be "Tune to Win" by a fellow named Caroll Smith. awesome book for chassis tuners. even has a model you can make in the back of the book for seeing what changes when you make adjustments.
I own both Formula SAE required reading.
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Old 07-31-2007, 05:34 PM
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Originally Posted by convikt View Post
I think the poor guy that started this threads head has exploded..lol...Keep in mind roll center is not a save all for poor handling, very helpfull, yes, it is that, but if there not a good balance on the car, then it wont help as much.....my .02
who you calling poor guy? im just around browsing the thread. looks like i got what i need for my car.
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Old 07-31-2007, 06:58 PM
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Yeah..but you're probably too busy to drive it.

Originally Posted by oversquared View Post
who you calling poor guy? im just around browsing the thread. looks like i got what i need for my car.
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Old 08-23-2007, 10:21 AM
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what effect does puting equal shims under the lower arm mount and the inner camber link. say 1mm.?

whats the difference in using 1m all round under both arm mounts and 2mm under the inner camber link vs. only putting 2mm under the camber link.?



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Old 08-24-2007, 07:09 AM
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or i should ask it a different way.

what effect does raising the rollcenters via the arm mounts then to lower it again via inner camber links has on the car?
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Old 08-24-2007, 02:39 PM
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This is helpful too.

http://users.pandora.be/elvo/
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