Roll Center Adjustment!
These are roll center adjustments for the front and rear of car.
Front: A-up, B-up, B-down, & A-down
I usually run B-up. A-up is the least responsive and A-down is the most responsive. As you go down, the steering becomes very aggressive. On a high bite track, this will make the car feel VERY twitchy and you will make many corrections in direction at slower speeds. I like to be aggressive to allow me to push the car, but not so aggressive I have to fight myself if I scrub to much speed by not being smooth and clean.
You need to be less responsive because the car tends to steer to much causing the rear of the car to break loose. This is why I like B-up for most tracks that don't have the bite like a big race.
Raising the hinge pins reduces the roll center and makes the car harder to roll onto the tires, so it reduces the rear bite. Winternats usually high bite and I will start at B-up and will probably be A-up.
On local tracks, non-preped, parking lot tracks, B-down and A-down will lower the hinge pins causing more roll onto tires and increasing rear bite. A good starting point is always B-down and work from that point.
Now saying all this, this is only one part of making your car fast in the corners. Springs rate, shock position, camber position, caster,shock oil, piston hole size or number, ackerman....., all have apart of cornering, but getting the correct roll center for your driving style is a must before you can fine tune your setup.
Serpent 748/Matrix Tires/Novarossi
Serpent America/Desoto Racing
Murnan Modified Motors