A lower rear roll center due to the smaller spacer makes the rear end stick better.
Originally posted by markp27
Using a smaller spacer on the rear upper arm affected the coning of the tyres - I had -3.5 and -3 degrees (right and left) and the tyres wore flat!!! 
I'll have to make an even more severe setting tomorrow.
Yup, the spacers above the rear hub affect the camber change. More spacer, more camber change besides giving higher roll center.
That is why I believe Julius found out that the ideal rear oll center and camber change comes from the 4 mm spacer.
Originally posted by markp27
That was a 6 hour session at the track today (crash free, too! 
), so I'll have to do a bit of cleaning and setup work tonight in order to get it ready for another session tomorrow.
6 hours?
What a nice life !
