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Camber geometry question

PostPosted: Fri Sep 23, 2016 4:31 am
by holywood3645
If I wanted to reduce my camber by 1 Deg' from vertical. How much would I need to move the holes on the top control arms?

James

Re: Camber geometry question

PostPosted: Fri Sep 23, 2016 8:18 pm
by toomspj
about 5mm

Paul

Re: Camber geometry question

PostPosted: Fri Sep 23, 2016 10:06 pm
by gus
why?

Re: Camber geometry question

PostPosted: Fri Sep 23, 2016 10:13 pm
by holywood3645
Why what!

Re: Camber geometry question

PostPosted: Sat Sep 24, 2016 12:21 am
by Foxie
holywood3645 wrote:If I wanted to reduce my camber by 1 Deg' from vertical. How much would I need to move the holes on the top control arms?

James


Spyder Engineering can supply variable camber upper wishbones :)

Re: Camber geometry question

PostPosted: Sun Sep 25, 2016 12:41 pm
by gus
A small amount of negative camber is generally regarded as 'good'
If there is significant unintended negative camber odds are the chassis is failing.

Re: Camber geometry question

PostPosted: Sun Sep 25, 2016 1:27 pm
by elanfan1
gus wrote:A small amount of negative camber is generally regarded as 'good'
If there is significant unintended negative camber odds are the chassis is failing.


Or wasn't straight/true in the first place. A respected restorer I know puts a jig on the front of the chassis through his shop and only a few are straight - even the new ones. It does make me wonder about the lengths folks go to with adjusting this and that when the chassis isn't straight to start with.

Re: Camber geometry question

PostPosted: Mon Sep 26, 2016 4:54 pm
by holywood3645
All taken care of now (Thanks Paul)

Now trying to optimize ride height.
\
James

Re: Camber geometry question

PostPosted: Mon Sep 26, 2016 6:02 pm
by englishmaninwales
elanfan1 wrote:
gus wrote:A small amount of negative camber is generally regarded as 'good'
If there is significant unintended negative camber odds are the chassis is failing.


Or wasn't straight/true in the first place. A respected restorer I know puts a jig on the front of the chassis through his shop and only a few are straight - even the new ones. It does make me wonder about the lengths folks go to with adjusting this and that when the chassis isn't straight to start with.


Well, suppose the chassis is not perfectly true. If the parameters are adjustable ( eg as are on a Caterham 7) you can still measure the camber, toe, rake, ride height and corner weights and adjust to give acceptable results. Providing it isn't too bent :lol:
Going to a lot of effort getting close makes a big difference if you've just lost on a Hillclimb by 1/00th of a second because you have some understeer or the front near side locks under braking.
Obviously it's not really necessary to adjust to the nth degree for the road, though.
Malcolm

Re: Camber geometry question

PostPosted: Mon Sep 26, 2016 7:59 pm
by holywood3645
I was a little positive on one side, and sometimes felt a little squirrely. I think this it happened when I had the chassis powder coated. Dialed it out now and it feels so much better, and much more a pleasure to drive. Both side now 1/4 to 1/2 Deg negative. Now trying to get it better with ride height adjustment, may even but some expensive Michelins.
These cars just feel soooo good on the road, Its a shame most people will never experience it.

James

Re: Camber geometry question

PostPosted: Tue Sep 27, 2016 4:21 pm
by patrics
Hi James,
Reading your original post it implies or at least I read it that way that you want more positive camber but I guess that's not the case.
If you slot the top arms like Paul said you can get 1 deg or so - so worth while, but any more than that then the top arms starts to foul the wheel on lock

Regards
Steve

Re: Camber geometry question

PostPosted: Tue Oct 04, 2016 7:49 am
by au-yt
Some one posted this link on another form and it is really worth a play to see what else you may need to adjust
www.vsusp.com

Re: Camber geometry question

PostPosted: Tue Oct 04, 2016 11:30 pm
by holywood3645
au-yt
Thanks for the link, now I need to figure how to use the tool.
James