Rear Camber and Tyre Wear

[paul.davis]

I have experimented with reducing camber on the rear (De Dion) when using ACB 10's and Avon (crossply) slicks. Even with "parallel" ears I had significant wear on the inside 1- 2 inches , both sides. So I have just milled my ears to create POSITIVE camber of 0.4 degrees. This seemed to work better, but still led to slight inside wear on my slicks. However, having switched from slicks back to ACB 10s for half a day at Spa and 25 laps of the Ring, my nearside ACB is completely worn on the inside half. Cold pressures arpound 16 psig- hot 24 psig.

 

How far should I go with positive camber - until I dial this out? Road holding seems unaffected so far by the change from negative .25 to positive .4 degrees.

 

I get a pyrometer this weekend so this will help diagnose tyre pressure changes and heat gradients across the tyre.

 

Any other ideas as to cause and remedy???

 

Paul

 

Zeeeeeeetec . . . . . .

 

 

Edited by - paul.davis on 26 Sep 2002 00:26:08

[Fast Westie]

Paul

Check that you don't have any toe in/out caused by a slight bend in the dedion tube. The best solution is to check the tyre temps as you come off the track

 

The car in front is a Westfie1d

[Peter Carmichael]

You should not be setting camber according to tyre wear You should set camber and pressure according to tyre temperatures recorded with a pyrometer.

 

24psi hot is over inflated for ACB10s. You should be aiming for 21psi.

[Paul Ranson]

And you should be using that pyrometer in controlled conditions, ideally after making your self dizzy driving in circles.

 

Paul