Adj A arms?
04-18-2010, 10:29 PM
#1
Le Mans Master
Thread Starter
Adj A arms?
Can someone tell me where I can purchase these please? I have one wheel that sticks out further than the other on the rear and want to correct it. Thanks for any and all help provided.
Seth
Seth
04-19-2010, 12:37 AM
#2
Team Owner
Member Since: Mar 2001
Location: Boston, Dallas, Detroit, SoCal, back to Boston MA
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I just bought a set from Guldstrand, but they're for a C4
Why is one sticking out further than the other?
Why is one sticking out further than the other?
Last edited by BrianCunningham; 04-19-2010 at 10:34 AM.
04-19-2010, 03:44 AM
#3
Not a good way to correct your problem. If the a-arms are not the same length as their opposites you will be moving the moment center. Doesn't mean car won't drive, but it will behave differently left to right. Square up your car instead.
04-19-2010, 07:28 AM
#4
Team Owner
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Check the alignment of your car
Check the off set of the wheels too assure they are the same.
May have to check your cars frame for trueness. Left to right and up to down.
Remember fenders are not perfect or mirrored identical left to right. One side may be or stick out more then the other side.
04-19-2010, 07:40 AM
#5
Race Director
I've been helping with this one, his wheels are really large, and when you run them right out to the fender lip it really exaggerates the differences that all cars have. What he really needs is offset upper-rear bushings, and we are trying to locate them. I know someone makes them, I just can't find the source.
We already discussed moving the cradle, but if you move the cradle "in", you then have to adjust the concentric "out" to maintain camber. He needs to either adjust the upper control arm OR move the fender
04-19-2010, 09:25 AM
#7
Melting Slicks
04-19-2010, 06:49 PM
#9
Le Mans Master
Thread Starter
Check the alignment of your car
Check the off set of the wheels too assure they are the same.
May have to check your cars frame for trueness. Left to right and up to down.
Remember fenders are not perfect or mirrored identical left to right. One side may be or stick out more then the other side.
I've been helping with this one, his wheels are really large, and when you run them right out to the fender lip it really exaggerates the differences that all cars have. What he really needs is offset upper-rear bushings, and we are trying to locate them. I know someone makes them, I just can't find the source.
We already discussed moving the cradle, but if you move the cradle "in", you then have to adjust the concentric "out" to maintain camber. He needs to either adjust the upper control arm OR move the fender
We already discussed moving the cradle, but if you move the cradle "in", you then have to adjust the concentric "out" to maintain camber. He needs to either adjust the upper control arm OR move the fender
04-20-2010, 07:32 AM
#10
Race Director
I don't see anything there that will help. If you put adjustable arms on (if anyone even makes them), you'll have to make one side shorter than the other, which will hurt handling. The only options I see are to find a bushing (still looking), re-weld the upper chassis mounts, or shim the fender out.
I'm still pretty convinced it's normal, just running wide rims right out to the edge makes differences much more obvious.
btw, a machinist could easily make a solid aluminum bushing for the uppers for you, but I imagine that would add some noise to your suspension.
I'm still pretty convinced it's normal, just running wide rims right out to the edge makes differences much more obvious.
btw, a machinist could easily make a solid aluminum bushing for the uppers for you, but I imagine that would add some noise to your suspension.
04-20-2010, 04:45 PM
#12
Race Director
It's the rear cradle.
They have some adjustment in them. You need to verify that you have it centered correctly. Maybe you bent a pin.
They have some adjustment in them. You need to verify that you have it centered correctly. Maybe you bent a pin.
04-21-2010, 08:42 AM
#14
Race Director
moving the cradle doesn't help, as any movement is simply compensated by adjusting the camber, and the a-arm ends up back where it was. I found a source for having some custom Delrin bushings made, but they are only thick enough to get about 1/8", so he'd have to do both sides.
Good news is it can be done, bad news is it's expensive. If you have access to a lathe and mill/drill press, you could probably just buy some Delrin on ebay and cut them yourself.
Good news is it can be done, bad news is it's expensive. If you have access to a lathe and mill/drill press, you could probably just buy some Delrin on ebay and cut them yourself.
04-21-2010, 11:22 AM
#15
Race Director
Why would it not help ?
The lower control arms dictate where the wheels line up in the fenders. By shifting it, left or right will even out the placement of the wheels in the fenders.
I would also have the alignment and frame checked for straightness.
The lower control arms dictate where the wheels line up in the fenders. By shifting it, left or right will even out the placement of the wheels in the fenders.
I would also have the alignment and frame checked for straightness.
moving the cradle doesn't help, as any movement is simply compensated by adjusting the camber, and the a-arm ends up back where it was. I found a source for having some custom Delrin bushings made, but they are only thick enough to get about 1/8", so he'd have to do both sides.
Good news is it can be done, bad news is it's expensive. If you have access to a lathe and mill/drill press, you could probably just buy some Delrin on ebay and cut them yourself.
Good news is it can be done, bad news is it's expensive. If you have access to a lathe and mill/drill press, you could probably just buy some Delrin on ebay and cut them yourself.
04-21-2010, 11:56 AM
#16
Race Director
when you move the cradle, you are only moving the LOWER control arm. This would decrease camber, and you would then have to move the control arm right back out where it was originally to get your alignment back. The rear pivot of the lower rear control arm is fixed, but it is also well behind the centerline of the wheel, so you would gain very little finished movement once you re-aligned the car.
The only way to move the lower control arm inward and maintain camber is to move the upper control arm also. In the front, this is easily done by removing washers on the upper control arms. In the rear of a C5/non-Z06 C6, it takes some special effort.
The only way to move the lower control arm inward and maintain camber is to move the upper control arm also. In the front, this is easily done by removing washers on the upper control arms. In the rear of a C5/non-Z06 C6, it takes some special effort.
04-21-2010, 06:20 PM
#17
Le Mans Master
Thread Starter
But the bushings will work even if the cradle can't be moved?
04-21-2010, 06:44 PM
#18
Race Director
yes, you can move the uppers 1/8" on each side, then adjust the concentrics the same amount to maintain camber. You'll be moving the entire spindle inward but keep it parallel to where it was originally. Moving just the top or bottom will move the tire, but change the camber.
04-21-2010, 06:52 PM
#19
Race Director
04-21-2010, 10:10 PM
#20
Le Mans Master
Thread Starter
yes, you can move the uppers 1/8" on each side, then adjust the concentrics the same amount to maintain camber. You'll be moving the entire spindle inward but keep it parallel to where it was originally. Moving just the top or bottom will move the tire, but change the camber.
Have not measured the frame, but all body lines are aligned and equal. The rear cradle is all the way to the left/pass side, and it came from the factory like that. The car has never been wrecked.