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Author
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Topic: Wilwood Brake porportioning valve
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jsracingbbf
Gearhead Posts: 2805
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 06-17-2004 01:47 PM
   
does anybody know where to set this thing as a beginning point?
It is in the front line after the line lock and of course the back brakes are supposed to catch before the front, BUT what is a starting point? I don't have anything that came with the valve, I got it second hand.
It has an "increase" and "decrease" with directional arrows but the increase is clockwise and the decrease is counter clockwise!  The thing has 11 turns from open to closed.
Thanks------------------
JS
"never submit yourself to scientific tests no matter how bad you need the money, for all you know they could have erased your memory and YOU WERE REALLY SOMEBODY BEFORE"
69 Mustang Pro ET Drag
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ukracer
Gearhead Posts: 154
From: South Wales UK
Registered: Apr 2003
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posted 06-17-2004 02:29 PM
When you say it is in the front line, you don't mean to the front brakes? Proportioning valves are for the rear brakes and should be set so the front wheels lock first, just ahead of the rears. Of course you would not normally lock the brakes anyway, it's just a way of showing that the brakes are getting all the pressure they need to work properly, but with a slight bias to the front for safety. I set my racers (road racers) like that and they work fine. I am afraid it's just down to trial and error as there are too many variables possible (change tyre sizes and the grip is altered). Is this for a road car or racecar? HTH
Cheers, Martin
PS, If you want a 'start point', bung it in the middle (5 1/2 turns)!
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Fstln69
Gearhead Posts: 550
From: Westmont,il
Registered: Jan 2003
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posted 06-17-2004 04:03 PM
wilwood suggests putting the valve in the front brakes they say you DONT want them to lock.I am in the process of plumbing my brandx brakes and am too confused myself i think i wont use the valve at all
Dennis------------------
69 fairlane 351w [email protected] in search of Body parts for 69 fairlane
66 brand x outlaw s/s
Fstln69 Pics Page
http://community.webshots.com/user/purple66bu
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Fstln69
Gearhead Posts: 550
From: Westmont,il
Registered: Jan 2003
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posted 06-17-2004 04:07 PM
Also i have been told that you dont want anymore then 700psi of brake pressure on the front brakes
Dennis------------------
69 fairlane 351w [email protected] in search of Body parts for 69 fairlane
66 brand x outlaw s/s
Fstln69 Pics Page
Webshots
Cardomain pics [This message has been edited by Fstln69 (edited 06-17-2004).]
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ukracer
Gearhead Posts: 154
From: South Wales UK
Registered: Apr 2003
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posted 06-17-2004 04:23 PM
I have never heard of putting a prop valve in the front brakes. The coefficient of friction changes dramatically with temperature so at different points in a race the brakes will need different pressures to achieve adequate braking force. Putting a limit on the pressure will mean that your brakes will be very weak sometimes. Not good when you are racing!
Proper racing cars and some modified production cars have NO prop valve and balance the pressure with two master cylinders and a bias bar to vary pressure.
I also don't see how you can say you don't want more than 700 psi in the front brakes. With what caliper piston sizes? Total piston surface area? Pad surface area? Coefficient of friction? Disc size? You see, too many variables so you have to be able to adjust to get the best from your brakes. As a circuit racer (road racer) I probably place more importance on brakes than I did when I was drag racing, when they really didn't seem to matter much. Guys would clamp off the rears completely for burnouts and leave it that way for the run. Ho Hum.
Cheers, Martin
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ukracer
Gearhead Posts: 154
From: South Wales UK
Registered: Apr 2003
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posted 06-17-2004 04:40 PM
Aha! A light bulb just popped on in my (tired) head! Do any of you run a prop valve in the front brakes because of the skinny front tyre/huge rear tyre combos you have on drag cars? That would make some sense. A lot more pressure would be needed for the rears than the fronts (I guess).
Cheers, Martin
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bud4660
Gearhead Posts: 518
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 06-17-2004 04:42 PM
I just put a SSBC system on the front of mine and it said to set the valve in the middle and adjust as needed. Also I put it on the rear side like the directions said. So six months from now when I get the motor in it I can tell you how it works....  ------------------
1967 GT Fastback S code, C6, 4:56, tubbed, 10 point cage.
http://www.allfordmustangs.com/forums/photopost/showgallery.php/cat/500/ppuser/12578 1998 GT Convert.(sold 11/29/03)
Mesh Grille, Air Silencer Trimmed
Automatic, 3:73 FRPP Gears, Mac Girdle, Moser Axles
Griggs Sub's, Welded/Plated Torque Boxes, Strut Tower Brace, Strange 10way Struts, MM HD lower control arms, Rear air bags
ProStars 15x10 w/295/50/15, 15x4 w/P195/75/15 and ARP Studs, 9/16" spacers
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bud4660
Gearhead Posts: 518
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 06-17-2004 04:45 PM
quote:
Originally posted by ukracer:
Aha! A light bulb just popped on in my (tired) head! Do any of you run a prop valve in the front brakes because of the skinny front tyre/huge rear tyre combos you have on drag cars? That would make some sense. A lot more pressure would be needed for the rears than the fronts (I guess).
Cheers, Martin
I would think if you used a linelock that would be a problem??
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 06-17-2004 08:04 PM
quote:
Originally posted by Fstln69:
wilwood suggests putting the valve in the front brakes they say you DONT want them to lock.
Have you ever had the rear brakes lock up first while going down a steep hill?? Let me tell you, it aint the least bit fun!!  ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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jsracingbbf
Gearhead Posts: 2805
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 06-17-2004 10:27 PM
quote:
Originally posted by ukracer:
Aha! A light bulb just popped on in my (tired) head! Do any of you run a prop valve in the front brakes because of the skinny front tyre/huge rear tyre combos you have on drag cars? That would make some sense. A lot more pressure would be needed for the rears than the fronts (I guess).
Cheers, Martin
YES the rears are much bigger!
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jsracingbbf
Gearhead Posts: 2805
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 06-17-2004 10:32 PM
it goes in the front without a doubt for dragrace cars, I checked with wilwood. I just wonder where to set it at to start with. You don't want the fronts to grab harder or so they say.
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Moneymaker
Administrator Posts: 26513
From: Lyons, IL, USA
Registered: May 99
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posted 06-17-2004 10:46 PM
Jerry, set it about 3 turns to start with the biased towards the front.
You can then sneak up on it as needed 1/2 turn at a time without fear of locking up the rear brakes the first time you stomp on them.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
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Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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jsracingbbf
Gearhead Posts: 2805
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 06-18-2004 03:35 AM
thanks Alex!
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