Camber Link Height:
Altering the camber link’s height (position vertically on the tower or occasionally on the hub) changes the vehicle’s roll center. This adjustment is most often tuned on the rear of the vehicle. Technically speaking, roll center is defined by the SAE as “the point in the transverse vertical plane though any pair of wheel centers at which lateral forces may be applied to the sprung mass without producing suspension roll.” ---- In other words: Think of roll center more simply as the point around which the vehicle’s chassis rolls in a corner.

So how do we apply roll center to vehicle tuning? All things being equal, when you move the camber link up the tower, the roll center is moved lower on the vehicle. When the link is moved down on the tower, the roll center is raised. In general, a high roll center (lower on the tower) is better for slippery or bumpy tracks because when you move the roll center really far from the ground level in either direction you introduce jacking, which messes with the ride height of the car, and you have a track width change that can either help or hurt your cornering performance.

For smoother high speed tracks, a low roll center helps decrease roll, and decrease weight transfer from left to right in a left hand turn and reduces the “tippy” roll-over feeling a car may get in high speed corners on a high traction track. Steering into the corner is increased as the car will “bite” more going in, but the vehicle will feel more stable coming out of the corner.

You can tune your over/understeer characteristic with roll center. Raising the roll center on the front or rear will make that end wash out first. So raising the rear will wash out the rear and make the car looser. Raising the front roll center will wash out the front first and make the car push.