[Tommy]

Spookypt,
Setting the right brake bias involves so many factors that it is not practical to give a single correct pressure differential number for your car. In fact, during a race, the need for brake bias can change. Thus cars like mine have an adjustment knob for that purpose in easy reach of the driver.

But for a starting point, here's my recommendation and logic. First, you want the front brakes to lock up before the rears for two reasons. This assures you get full braking from the fronts (the more effective brakes) before anything locks up. Also, a car with locked front brakes is less likely to unexpectedly change directions (i.e., spin) than one with locked rear brakes.

Second, the dynamic weight transfer that occurs when applying the brakes effectively adds weight and grip to the front tires while taking weight and grip from the rear tires. The harder you decelerate, the greater this effect. This means you will be able to apply much more braking force (without locking) to the front brakes than to the the rears. For these reasons, I suggest you start with a pressure bias of about 65-75% to the front.

About the only other thing you can do before you actually try out a setting on the track is to test your brakes in a safe place. Get the car up to 40 MPH or so and press the brakes hard enough to briefly lock them up. It might be helpful to have a friend watch your car from a safe place at the road side. If the rears lock up first, increase the bias to the front and try again. If the fronts lock up first, decrease the bias until the rears lock up first, and then bump the bias back to the front just a little.