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Posted: Sat Apr 15, 2006 8:46 am
by jamal
our suspension definitely goes into positive camber with enough bump. Hence why the auto-x guys are still running -3+ degrees on super stiff springs and swaybars.

Basically, negative camber increases until the control arms/lateral links are parellel to the ground, then it goes less negative. There are some neat graphs showing the relation of bump/droop to camber and toe that I'll try to find later.

Posted: Sat Apr 15, 2006 2:57 pm
by scottzg
huh. I didn't know the wheel could travel high enough to do that.

Posted: Sat Apr 15, 2006 3:38 pm
by THAWA
It doesn't take that much to make the wheel go positive, especially with the stock camber alignment. It's 0º for AWD, and -0º15' for FWD. So any bump at all, even as small as 1mm for AWD, sends that wheel positive.

Also, the parallel thing isn't entirely true. When the arms are parallel to the ground, the pivot points are already past parallel, the pivot points are what matter. And AFAIK, our suspension always goes tword positive when in bump. This is in reference to the static alignment. If you start out with like -1º camber, it might take a larger bump to go to positive camber, but it's definately not going negative no matter where the arm is above static. It's just once the pivot points are past parallel, the increases in positive camber come much quicker. For example, let's say the pivots are below parallel. Let's say it takes 10mm of bump to gain 1º of positive camber, when the pivots go past parallel that same 10mm of bump would give you something like 1.5º of positive camber.

Posted: Sat Apr 15, 2006 6:35 pm
by jamal
Here's that graph I mentioned:

Image

It's for an Sti but the geometry is pretty similar. Also notice how it shows it as going more negative with bump before it goes positive.

Posted: Sun Apr 16, 2006 1:41 am
by THAWA
Okay, maybe I'm retarded. Point is, it happens.

Posted: Sun Apr 16, 2006 1:50 am
by scottzg
i was under the impression that the wheel would lose traction before it reached the point where it started going positive again. So, it would only start going positive when you hit a bump while turning. Since most cars would bottom out at that point, it really wasn't so bad. Maybe im mistaken, i haven't really looked in to it.

And yes, hardy, you are probably retarded. Are you comming down for Rim?

Posted: Sun Apr 16, 2006 2:05 am
by THAWA
Negative. I'm going to pm you though.

Posted: Thu Apr 20, 2006 8:08 am
by georryan
Coming down for Rim??