big brakes

[sixty-niner]

greetings,
I am getting ready to install some good size brakes on my 69 charger. 6 piston 12.88 wilwoods in the front and 4 piston 12.88 in the back.  I am planning on auto-crossing this car in the future.  Do I need a hydroboost to get the most out of this brake kit?  or can I just run a regular master cylinder or even non power brakes? 
any insight would be great. thanks

[c00nhunterjoe]

How big are your calves and thighs? The hydroboost will give you no more "pressure" then vaccum assist or manual brakes. The boosters just decrease pedal effort.

[sixty-niner]

calves are average I guess, this sounds like something that can be added later.  thanks for the response.

[WHITE AND RED 69]

How much vacuum is the motor putting out? If you have a big cam with low vacuum the power brake booster isn't going to do much, so the better option would be manual brakes or hydroboost in that case.

[c00nhunterjoe]

I have manual brakes in all but the ss nova and have no complaints. Other opinions will vary. Hydro boost is nice but costs 10-15 hp on avg

[cdr]

Call Wilwood, you cant just guess on the correct master cyl, it is all math on the bore size & diam & how many pistons in the calipers, I also have manual brakes & they work great.

[MSRacing89]

I have manual brakes in all but the ss nova and have no complaints. Other opinions will vary. Hydro boost is nice but costs 10-15 hp on avg

You are  .  It only activates the hyroboost pump while under braking.  There is no HP loss.

[John_Kunkel]

The hydroboost will give you no more "pressure" then vaccum assist or manual brakes.

Interesting assertion. 

[MSRacing89]

How big are your calves and thighs? The hydroboost will give you no more "pressure" then vaccum assist or manual brakes. The boosters just decrease pedal effort.

I think the public deserves a bit more insight into these vague answers.  There are variations in line pressure for different set-ups.  There are also variations created by master cylinder size and pedal effort from the user.

But as a guideline, manual brakes will be around 900 to 1000psi, vacuum will give you a bit more at 1200psi.  Hydroboost will push this up into the 1800-2000psi range (the reason for it's early development was assisting heavier vehicles) 

I have blown through several piston seals on my rear brakes with my hydroboost during racing applications.  I generally tell people that the hydroboost was the single best mod I did to the car. 

[Kern Dog]

Call Wilwood, you cant just guess on the correct master cyl, it is all math on the bore size & diam & how many pistons in the calipers, I also have manual brakes & they work great.

Are you running a disc/drum setup or 4 wheel disc?