Power brake question

[akrapovic]

I just installed c5 front and rear brakes in my car. I'm wondering if I will have enough vacuum to run a DSE master/booster. My cam specs are as follows:

242/250
.595/.595
LCA=114. Cam is installed at 111

This is a hydraulic roller cam.

Thanks in advance

[Payton King]

at idle?

You could always go with a 7/8 master from wilwood and just run a manual set up as well.

[akrapovic]

Sorry, yes I meant at idle. I may have to consider the manual option. I'm hoping I'll get 14-15" at idle but I don't think it's going to happen.

[akrapovic]

Screw it, going manual. Thanks Payton.

[ProdigyCustoms]

Only problem with going manual on those brakes is those are designed as power brakes. Wilwood brakes like Payton is running are designed as manual brakes, designed to work on less pressure. I have not heard a lot of sucsess storys of factory C5 brakes in manual brakes. You may find to run manual brakes you need the volume oif a 15/16" and the pressure of a 7/8", which of coarse is impossible to do.

[Vegas69]

If I had it to do all over again, I would go hydraboost. JMO

[Payton King]

You could also use a product from ABS that is an electric power brake system. http://www.abspowerbrake.com/electrichppage.html

[wedged]

Originally Posted by ProdigyCustoms

You may find to run manual brakes you need the volume oif a 15/16" and the pressure of a 7/8", which of coarse is impossible to do.

The stroke of the 7/8" would need to increase by about 20% to equal the volume for a given stroke of the 15/16". Pressure would not be generated until the caliper pistons squeezed the pads against the rotors. You would need to make sure you had enough stroke available and the right pedal ratio. The issue is if the parts exist to make it happen.

A dual master set up might work for something like this ?

[ProdigyCustoms]

Originally Posted by Vegas69

If I had it to do all over again, I would go hydraboost. JMO

You would HATE it, way over boosted feel with your big brakes. Imagine autocrossing and trying to push the gas pedal through the floor one second, then laying you toe gently on the brake pedal to keep from skidding into the corner. It is difficult at best.

[Vegas69]

I guess I should drive a car with hyrdaboost before I open my big yapper. I'm just not that crazy about my manual brakes. I've been driving BMW's to long. As little as I drive the car, the change feels to dramatic.