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Brake Bias and prop valve questions for road racing

Old 02-14-19, 12:22 AM
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Brake Bias and prop valve questions for road racing

Hi,

Currently setting up the car for the racetrack. Road Atlanta, Talladega small track, and Barber Motorsports

The setup will be:
Brembo F50 4piston front brakes on 345mm rotors, ducted with 2.5in duct to custom backing plate
OEM rear brakes
Wilwood Dual Reservoir Manual Master Cylinder

Now,
I've read that the fd3s is inherently 68% front biased from the factory. I see people running prop valves, on abs delete kits, but the prop valve is typically placed on the rear line. So to me, it would mean that slowing off the rear brakes would give even more front bias. So then the general desire around here is that drivers wish to have less rear brake on oem brake setups? The driver and team we are working with only has experience with bias bars and true dual master cylinder setups so using a prop valve is new to all of us

however,
when we move to the larger front brake setup, with larger pistons, this should dramatically increase the front bias. Would it not make more sense to run a prop valve on the front brakes, so as to help calm the front brakes down and overcome this bias of upgraded fronts? Or better yet should we consider running front and rear prop valves?

the platform is a 4 rotor turbo engine, overall weight is 2900lbs, 50 50 distribution, 14kg front 12kg rear spring, 3 degree front camber negative 2 degree rear negative. 250/640 and 280/680 yokohama slicks, and approximately 1000rwhp through a 4 speed dog box

What are you guys experiencing with upgraded front brake kits and bias?

Our goal is to be able to keep the rear brakes heavily active but not lock up, so that we can trail brake. And be able to dial in and out on the track. Depending on the bias, pad friction front to rear type will be chosen to aim for ideal ratio. We just havent had any experience in this car to get an initial game plan.

thankyou
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