Negative Rollcenter Height

[exwestracer]

The lower the roll center, the better theoretical traction at that end of the car. Lowering the roll center reduces the weight transfer up off the inside tire as the body rolls outward in a turn.

Imagine the car had a solid suspension. As you lift one side of the car, that tire will immediately come off the ground. A high roll center has much the same effect.

I say better "theoretical" traction because a lot of body roll leads to a lot of camber change, loss of contact patch, and a very unsettling feel for the driver. It also screws around with any front aero we might have aiding traction. So, as Bryce pointed out above, we usually artificially raise the roll center with bars anyway. Lowering the C/G will allow a low roll center without a lot of roll moment and allow us to run a smaller bar, giving the suspension a little more freedom to work.