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Xophertony Rodeo Queen
Joined: 13 Oct 2005 Posts: 5304 Location: Portland, Oregon.
1988 Pontiac GTA
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Posted: Wed May 03, 2006 8:03 pm Post subject: wilwood adjustable proportioning valve.. |
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.. 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 Member
Joined: 04 Feb 2004 Posts: 169 Location: Olympia, WA
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Posted: Wed May 03, 2006 8:08 pm Post subject: |
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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? _________________
www.cardomain.com/id/gibbys85 |
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Xophertony Rodeo Queen
Joined: 13 Oct 2005 Posts: 5304 Location: Portland, Oregon.
1988 Pontiac GTA
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Posted: Wed May 03, 2006 8:14 pm Post subject: |
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who's gonna know? 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 Member
Joined: 19 Nov 2005 Posts: 4379 Location: Bremerton, WA
1992 Chevrolet Camaro RS
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Posted: Wed May 03, 2006 8:49 pm Post subject: |
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One problem I see is giving the rear too much bias, use the brakes and and your car will swap ends real fast. |
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iansane Member
Joined: 16 Jan 2004 Posts: 5740 Location: Bothell
1991 Pontiac Trans Am
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Posted: Wed May 03, 2006 9:12 pm Post subject: |
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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 Member
Joined: 19 Nov 2005 Posts: 4379 Location: Bremerton, WA
1992 Chevrolet Camaro RS
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Posted: Wed May 03, 2006 10:13 pm Post subject: |
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Thanks for the correction.....
Just things I've heard from watchig races, watched one spin real good once. |
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Xophertony Rodeo Queen
Joined: 13 Oct 2005 Posts: 5304 Location: Portland, Oregon.
1988 Pontiac GTA
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Posted: Thu May 04, 2006 1:23 am Post subject: |
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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
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Posted: Thu May 04, 2006 1:27 am Post subject: |
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I seem to remember someone telling me the 'correct' way to set it is 65% front and 35% rear. _________________
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Xophertony Rodeo Queen
Joined: 13 Oct 2005 Posts: 5304 Location: Portland, Oregon.
1988 Pontiac GTA
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Posted: Thu May 04, 2006 1:29 am Post subject: |
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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. |
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iansane Member
Joined: 16 Jan 2004 Posts: 5740 Location: Bothell
1991 Pontiac Trans Am
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Posted: Thu May 04, 2006 1:40 am Post subject: |
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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
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Posted: Thu May 04, 2006 7:38 am Post subject: |
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I want one! |
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blue89 Member
Joined: 23 May 2006 Posts: 3482 Location: Bellingham/Eugene
1986 Chevrolet Camaro RS
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Posted: Tue Jun 06, 2006 6:54 am Post subject: |
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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 Rodeo Queen
Joined: 13 Oct 2005 Posts: 5304 Location: Portland, Oregon.
1988 Pontiac GTA
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Posted: Tue Jun 06, 2006 11:39 am Post subject: |
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thanks for the input. i still have not installed it waiting on front brakes now. |
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Schultzy89GTA M.R.A. (11sec Club)
Joined: 08 Jan 2004 Posts: 4415 Location: Gresham, OR
1989 Pontiac GTA
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Posted: Tue Jun 06, 2006 11:43 am Post subject: |
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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 _________________ Red Sled: 89 GTA, 383, TKO, N2O
12.73 @ 109.39, 1.793 60 \ 11.794 @ 121.16, 1.62 60 (old combo) |
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Xophertony Rodeo Queen
Joined: 13 Oct 2005 Posts: 5304 Location: Portland, Oregon.
1988 Pontiac GTA
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Posted: Tue Jun 06, 2006 11:49 am Post subject: |
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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 |
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Dewey316 The Lama
Joined: 08 Jan 2004 Posts: 7295 Location: Bringing the tech
1990 Chevrolet Camaro RS
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Posted: Tue Jun 06, 2006 11:54 am Post subject: |
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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
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Posted: Tue Jun 06, 2006 12:14 pm Post subject: |
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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 Hardcore (12sec Club)
Joined: 13 Jan 2004 Posts: 9191 Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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Posted: Tue Jun 06, 2006 12:55 pm Post subject: |
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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
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Posted: Tue Jun 06, 2006 1:01 pm Post subject: |
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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 Member
Joined: 23 May 2006 Posts: 3482 Location: Bellingham/Eugene
1986 Chevrolet Camaro RS
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Posted: Tue Jun 06, 2006 1:35 pm Post subject: |
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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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