Re: Proportioning valve: where to install it?
[Re: domingo]
#1351275
12/14/12 02:04 PM
12/14/12 02:04 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Hi!
I have a wilwood adjustable proportioning valve that I plan to install on my race car.
My race car is about 3000 lbs automatic, with a HEMI.
I have front wilwood drag discs up front with 10.75" rotors and dr. diffs rear discs out back with 10,7" rotors.
I know the proportioning vlave is always installed on the rear brake line on street cars.....
But I was wondering if on a race car, equipped with front skinnies (I run 27" x 4,5") and rear slicks (I run 33" x 10,5"w) this would have to change??? Should I put the proportioning valve up front to prevent the front tires to lock out since they are so narrow?
Thanks!
We install them on the back brakes especially when running big slicks on the rear.We adjust till the front just starts to nose down.You don't want the slicks to lock up sooner since most weight is on the front.If the slicks lock up first or harder than the fronts then you have a good chance of the slicks breaking loose and seeing the track from directions other than forward. 
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Re: Proportioning valve: where to install it?
[Re: domingo]
#1351277
12/14/12 03:05 PM
12/14/12 03:05 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
OK! Thanks for the advice.
One more qustion though out of curiosity: I have read before about people putting bigger rotors and better calipers out back when running big slicks because they said bigger tires have more innertia and they need better braking power then the light and small front skinnies.
What do you say about this?
BS,is what I say.We are talking about dragcars with big slicks.Cars with in most cases are heavier in the front.Just like a street car that has braking bias adveraging 68%front,32% rear try driving on a slick road with only back brakes  .
In the early days when we were young and stupid we never ran front brakes on our gassers,altereds and dragsters.We depended on the chute to slow us down.I can tell you from personal experiences that when I tryed to stop with the brakes alone that those were the rides I still remember today.Even today,the fast cars throw out the laundry before they touch the brakes.Anyone tells me to lock up a set of slicks over 150mph might as well talk to the wind. 
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Re: Proportioning valve: where to install it?
[Re: domingo]
#1351280
12/14/12 04:33 PM
12/14/12 04:33 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
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OK OK OK!
Will do as you say. I dont want to make any of my runs "memorable" due to brake related issues!!!!!!
Thanks for the advice!
 
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Re: Proportioning valve: where to install it?
[Re: justinp61]
#1351283
12/14/12 04:52 PM
12/14/12 04:52 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Domingo just curious, what size master cylender are you running?. My Dart is 3260# street/strip and has a 1 1/32 bore mc on it and stops great but I wish it had a 1" bore instead. It has Strange brakes on the front and Wilwoods on the rear. The proportioning valve is in the rear line but is wide open.
Most factory style master cylinders are porportioned at 65%front and 35% rear.Check them for % ratings.Wide open lessens the pressure,like putting your thunb on a water hose.In increases the pressure,
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