Another Proportioning valve question

[Mopower71]

First the setup
72 Demon
73 and up front disks.
Wilwood rear disks.
Late model master. with the plastic top and screw on covers.
Summit Adjustable proportioning valve in rear brake line.
NO Stock Proportioning Valve.
Car on jack stands and engine in 1st,give it some go pedal while holding the brake pedal, it overrides the rear brakes so the wheels turn.
The summit adj valve is set at 1 1/4 turns out from being seated.
Brake pedal does feel a little spongey. But I bled all the lines not to long ago.
Where should I set this valve Aprox?
Don't want to run the car to much and annoy the neighbors

 

[340duster]

You will have to drive it and do some heavy braking to determine the optimal setting for your car. The fronts should lock up before the rear.

If your brake pedal is still spongy after fully bleeding the brakes you still have a brake problem. what size is the master cylinder, make sure it is not one from a FWD they look the same but have a small piston.