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!

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

Car is an 89 chassis with a LS1 in it...

Did you gut the stock proportioning valve?

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

That's very dependent on which master cylinder you used.

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

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?

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