Originally Posted by BJ
Ok Still all good stuff,
Maybe I looked at the subject from a different angle
as not all drivers can get a real feel for/or not a 100% feeling for what the car is doing, so for me the aid of understanding where the Roll center is located was to help understand it further, diagrams etc help.
If your car was sluggish then would you not want to have move your roll center down to get more roll = grip?
Also what would the out come be if you placed a 1mm shim under the camber link inner and outer? would this be keeping the mid corner grip the same just preventing less roll.
Are you also saying that a 1mm shim under camber link inner only does not have such a big impact as having a 1mm shim under A arm?
By sluggish i mean that it don't change direction quickly, in which case the car rolls too much. Solutions are add roll bars, use stiffer springs or raise roll centre.
if you raise the camber link by 1mm on each side you drop the roll centre a bit, so your car will roll a bit more, i guess it will generate a bit more overall grip.
I'm saying that there is more than the effect on the roll centre to take into account, and that when changing the angle of the upper link, the greater effect is that of camber change not roll centre.
Example, TRF415 with LW suspension, rear end :
RC position initial : 7.87mm under chassis
Raise inner camber link 1mm : 8.74mm
Lower inner camber link 1mm : 7mm
Raise outer camber link 1mm : 7.09mm
Lower outer camber link 1mm : 8.70mm
Raise both sides camber link 1mm : 7.93mm
Lower both sides camber link 1mm : 7.80mm
Raise inner arm position 1mm : 5.74mm
Lower inner arm position 1mm : 10.11mm
So the effect on Roll Centre when moving the wishbones is about 2.5 times greater than by moving the Upper link.
The Effect is slightly greater when moving the inner side of the camber link than the outer.
The effect on moving the whole camber link up and down is the lowest of all.