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[ 8 posts ] |
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Brake proportioning valve
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docwyte
Rookie Driver
Joined: Nov 06, 2010 Posts: 4
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Hey guys,
What do you suggest for an adjustable brake proportioning valve?
Also, is there a DIY for gutting the stock proportioning valve and installing the aftermarket one?
TIA!
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Sat Nov 06, 2010 10:52 pm |
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GregF
Driver
Joined: Nov 21, 2009 Posts: 216 Location: Redmond, Wa.
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There is no stock proportioning valve on the N/A 944 cars. It only came on the S2 and Turbo cars. There are several different versions available as it was also used on the 964, 928, 993 etc. We have had the best results with the Tilton lever style proportioning valve mounted in the drivers compartment. ( SCCA or Prep 2 cars only) I do have an 86 that is running the stock 944 Turbo rear valve and that seems to work pretty well at a 33 bar crossover. Greg F
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Mon Nov 08, 2010 9:39 pm |
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docwyte
Rookie Driver
Joined: Nov 06, 2010 Posts: 4
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Car is an 89 chassis with a LS1 in it...
Did you gut the stock proportioning valve?
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Mon Nov 08, 2010 9:44 pm |
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GregF
Driver
Joined: Nov 21, 2009 Posts: 216 Location: Redmond, Wa.
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No, the stock proportioning valve can be easily removed by removing the exit line and threading that directly into the master cylinder after removing the factory prop valve. We have done a couple of LS1 and LT1 conversions here and have not felt that the stock valve needed to be changed. All of the cars used an aftermarket hydraulic assist pump except the LT1 car, which needed two feet to stop it. Greg F
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Wed Nov 10, 2010 7:24 pm |
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docwyte
Rookie Driver
Joined: Nov 06, 2010 Posts: 4
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That's very dependent on which master cylinder you used.
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Thu Nov 11, 2010 9:26 am |
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GregF
Driver
Joined: Nov 21, 2009 Posts: 216 Location: Redmond, Wa.
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The LT1 car had a standard 944 master cylinder from an 86 N/A car installed. That is about as small of a bore size we could install with the stock 4 piston calipers before the pedal travel was objectionable. Greg F
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Sat Nov 13, 2010 2:02 pm |
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docwyte
Rookie Driver
Joined: Nov 06, 2010 Posts: 4
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Yes, but I'm using a hydroboost master cylinder from a Ford mustang.
So back to my question, which adjustable proportioning valve to use and how to install it?
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Sat Nov 13, 2010 4:52 pm |
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GregF
Driver
Joined: Nov 21, 2009 Posts: 216 Location: Redmond, Wa.
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Tilton offers an adjustable unit with metric fittings that makes the plumbing much easier. I generally mount them in the cockpit for race cars, but it can be installed next to the master cylinder to make plumbing easier. Greg f
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Sun Nov 14, 2010 5:22 pm |
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