Originally Posted by
EDWARD2003
Thank you for your response. But, the primary adjustment is to adjust the ride height and secondary is roll center?
I also heard going to softer springs will result in more roll. Which is interesting.
If you are running the Yokomo car then maybe those spacers can be used for ride height. On an AE dynamic front end they are never used to adjust ride height. They are only used to set the droop on the front suspension by assuring the correct preload on the spring, or to place under and over the top suspension arm to adjust the roll centre.
Contrary to popular myth, although raising the outer end of the moving suspension does have some impact on the camber change, it is minimal to nothing. The front suspension moves about 1mm during racing on AE20 springs, so a 0.35mm change in the height of the top link when moved through a 1mm arc means the change in camber angle in roll is about two-tenths of bugger all. Softer springs allow more suspension movement so camber change could be altered as much as four-tenths of bugger all!
The change to roll centre by moving the arm up or down has far more impact on the handling. The stiffer you make the front end (higher roll centre) the more grip you will get. If the front of the car is snatchy and trends to grip roll, lowering the roll centre will help tame that.
This is not dissimilar to fitting a softer front tyre. Although a softer tyre will give more grip, it will also compress more - much the same effect as a softer spring. If you allow the car to roll more then you will get less tendency to grip roll. As the chassis can roll more, it lowers the CofG in a corner and reduces the tendency to grip roll.
It all sounds counter-intuitive, but fitting softer tyres when the grip comes right up, and lower the front (and rear, if you can) roll centres helps tame grip roll. HTH