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wilwood adjustable proportioning valve..

 
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Wed May 03, 2006 8:03 pm    Post subject: wilwood adjustable proportioning valve.. Reply with quote

.. only cost my $30 at napa today. what a cheap mod. soon i will utilizing my rear brakes. planning on installing it on sunday.
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Gibby85
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Joined: 04 Feb 2004
Posts: 169
Location: Olympia, WA


PostPosted: Wed May 03, 2006 8:08 pm    Post subject: Reply with quote

I dunno if those are "street legal". I have one that for the rear disc swap I was going to do and the subject came up about their legitamacy for street use. I guess they could be an insurance risk. Any info on that?
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Wed May 03, 2006 8:14 pm    Post subject: Reply with quote

who's gonna know? Very Happy for real though i can't imagine them being illegal.

should i replace the master cylinder at the same time? the TGO tech article recomends changing it out at the same time.
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Al Hasse
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Joined: 19 Nov 2005
Posts: 4379
Location: Bremerton, WA

1992 Chevrolet Camaro RS

PostPosted: Wed May 03, 2006 8:49 pm    Post subject: Reply with quote

One problem I see is giving the rear too much bias, use the brakes and and your car will swap ends real fast. Shocked
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iansane
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Joined: 16 Jan 2004
Posts: 5740
Location: Bothell

1991 Pontiac Trans Am

PostPosted: Wed May 03, 2006 9:12 pm    Post subject: Reply with quote

Only problem with that is you won't be giving any more rear bias unless you completley ditch the stock combo/prop valve or gut it.

You'll just be bring down the pressure that already comes through there.
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Al Hasse
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Joined: 19 Nov 2005
Posts: 4379
Location: Bremerton, WA

1992 Chevrolet Camaro RS

PostPosted: Wed May 03, 2006 10:13 pm    Post subject: Reply with quote

Thanks for the correction.....

Just things I've heard from watchig races, watched one spin real good once.
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Thu May 04, 2006 1:23 am    Post subject: Reply with quote

the idea is that i would completly remove the stock valve and set the brake proportion so that the rears lock up just after the fronts.
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Quasi-Traction
"I have petals"


Joined: 24 Oct 2005
Posts: 3873
Location: stumptown

1986 Chevrolet Camaro Berlinetta

PostPosted: Thu May 04, 2006 1:27 am    Post subject: Reply with quote

I seem to remember someone telling me the 'correct' way to set it is 65% front and 35% rear.
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Thu May 04, 2006 1:29 am    Post subject: Reply with quote

since i am running non stock brakes (much larger in rear then front, proportionaly) i will need to change that a bit. thats why i am getting the adjustable one. plus it's cool. Cool
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iansane
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Joined: 16 Jan 2004
Posts: 5740
Location: Bothell

1991 Pontiac Trans Am

PostPosted: Thu May 04, 2006 1:40 am    Post subject: Reply with quote

Quasi-Traction wrote:
I seem to remember someone telling me the 'correct' way to set it is 65% front and 35% rear.


It's really more a matter of what the driver likes and can handle.
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Twilightoptics
Hardcore (12sec Club)


Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Thu May 04, 2006 7:38 am    Post subject: Reply with quote

I want one!
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blue89
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Joined: 23 May 2006
Posts: 3482
Location: Bellingham/Eugene

1986 Chevrolet Camaro RS

PostPosted: Tue Jun 06, 2006 6:54 am    Post subject: Reply with quote

I know this is an old thread, but I have a wilwood prop and a 94 1" master cylinder. It stops way faster, and its more stable. The car feels way more solid during a hard stop.
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Tue Jun 06, 2006 11:39 am    Post subject: Reply with quote

thanks for the input. i still have not installed it Rolling Eyes waiting on front brakes now.
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Schultzy89GTA
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Joined: 08 Jan 2004
Posts: 4415
Location: Gresham, OR

1989 Pontiac GTA

PostPosted: Tue Jun 06, 2006 11:43 am    Post subject: Reply with quote

Might be a good idea to use a G-tech/Tazzo meter to measure braking distance as you dial in a good setting. Get the best stopping distance while maintaining stability. Al is right, I have seen some pretty nasty spins from too much rear brake bias. I think a few of us have meters. I have a Tazzo if you want/need to borrow it.

-Schultzy

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Xophertony
Rodeo Queen


Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Tue Jun 06, 2006 11:49 am    Post subject: Reply with quote

sounds good. i will deffinatly do that. the key to this whole deal (i was watching a thing on trans am racing on speed with my dad) is to have just enough rear bias to lock the rears AFTER the fronts. as long as your rear wheels are still rolling and the fronts are sliding you should not swap ends. if the rears lock first (trail braking) you will be face to face with a verry scared driver behind you. in theory you could have NO rear brakes and be fine (kinda like i do now).

so what i will do is find a nice strech of road and stop hard, and if my rears lockup first i will adjust some rear out, do it again and so fourth...

the gtech will be cool though. then i will know my stoping distances Cool
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Dewey316
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Joined: 08 Jan 2004
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Location: Bringing the tech

1990 Chevrolet Camaro RS

PostPosted: Tue Jun 06, 2006 11:54 am    Post subject: Reply with quote

remeber, your driving style will change this, as will pad wear. Most race cars, can adjust front/rear bias during the race, as pads wear. If you do a lot of trail braking, you are going to want less rear bias, than you would if you drive the car, and only brake in a straight line.
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Xophertony
Rodeo Queen


Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Tue Jun 06, 2006 12:14 pm    Post subject: Reply with quote

my brakes will be set up for normal street driving. i will probably dial out a little more rear then is necisary just to be on the safe side.

i am debating weather or not i want to mount it under the hood or next to my seat....
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Twilightoptics
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Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Tue Jun 06, 2006 12:55 pm    Post subject: Reply with quote

Xophertony wrote:
my brakes will be set up for normal street driving. i will probably dial out a little more rear then is necisary just to be on the safe side.

i am debating weather or not i want to mount it under the hood or next to my seat....


That's alot of breakline. Wouldn't the pressure drop a little having that much extra brakeline brining it into the passenger compartment?

I think the racecar ones are electronically controlled on the inside, or the brake setup is designed to split there rather than upfront.

That's just my guesstimation. I don't think it's that neccessary on a street car to be able to control it from the drivers seat.

Just my .02
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Xophertony
Rodeo Queen


Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA

PostPosted: Tue Jun 06, 2006 1:01 pm    Post subject: Reply with quote

good points paul. my dads dirt car has it there. but also i would not run it to the valve and back into the engine bay and then out. i would go from the MC along the ouside using the normal rouuting, then up through the floor and to the valve, out though another hole and out to the back. but i realy don't want tome ugly prop valve in my car. i would rather it was under the hood.
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blue89
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Joined: 23 May 2006
Posts: 3482
Location: Bellingham/Eugene

1986 Chevrolet Camaro RS

PostPosted: Tue Jun 06, 2006 1:35 pm    Post subject: Reply with quote

check out reentryracing.com

his car has it inside like you guys are talking about. For normal driving tho, it would be pointless....
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