Going off in another direction. Wilwood is here in Atl this weekend at an auto show. I wish I could post the fellas name since he was so helpful. Anyhow he taught me about
using a balance bar and proportioning valve in combination for track cars. When you use and set up the two. First off you crank down all the way on your proportion valve. This will remove it's use from the system. Now you adjust your balance bar to liking. However now you will more than likely have that really hard braking turn where the rears will still lock. That's now where you start to dial in the proportion valve for these turns.
He also talked how important it is to use the rears as much as possible. Better rear braking is better braking overall. A proportion valve only set a point where diminished increase in pressure starts. Increasing pressure at 50% value. Say you set it at 800 lbs., once you reach this pressure, the valve allows an increase from that point at 50%. So 900 lbs. would be 850 lbs. through the valve.
For a track car guys are not using the knob/rotary screw valve. But the six position lever/detente style for easier use and visuals. So now you have two brake adjustments inside the car. Makes sense to me!
Knob/Rotary
Lever/Detente
http://www.summitracing.com/expertad...lanta-motorama
Ralphy