Lemming

I've just upgraded my track car to 968 brakes all around. So for those of you running this setup on the track, are you running a proportioning valve (if so, which one) and are you running the same pad compound front and rear.

cooz

Hey Tim

i run 968 M030 brakes on my 968 race car with same pads front & rear (performance friction 01) and 1st upgrade change on proportioning valve...(sorry don't remember spec on value from memory but i believe i got ot from Paragon who should know)

hope this helps
norm mandell

93 FireHawk 968

Standard valves w/M030 brakes with Pagid Orange pads f and r. I did use KPC pads but was not getting the longevity expected.

Lemming

Unfortunately I did not step up to M030 brakes, just using the standard. I did order some Hawk DTC-60 pads based on some suggestions and previous experience with HT10's.

Rich Sandor

My 968 has the non-m030 brakes and I run Ferodo DS2500's all around, with very little fade after an aggressive track day in the advanced run group. The 968 has more power and is heavier than your 924S (unless you have a 968 motor in there...), so it should be harder on the brakes than your 924S.

What is the difference between your 924S proportioning valve and the non-m030 968 prop valve? Do you know if they are the same?

Geoffrey

It isn't a proportioning valve, it is a pressure limiting valve...

Lemming

Yes, my 924S does have a 968 engine in it, but weighs 2500 coming off track (except when I race PCA where I have to be a bit heavier).

I'm using the stock 924S master cylinder and am not sure if there is a "pressure limiting valve"?

Rich Sandor

What's the difference?

cooz

just a note:

M030 brakes use larger front pads/calipers.etc only.....rears are same

smlporsche

Tim-
I changed the "Pressure Limiting Valve" from the stock one on my S2 to the one on the Turbo S which has a slightly more rearward bias. I "think" it was the 5/33 but don't hold me to that.
I too got it from Paragon after going through 3 set of pads in the front and still having 75% of the pads in the rear.
With the Gaurd LSD helping me keep my a$$ planted under threshold braking I have definitely felt an improvement but I haven't run it long enough to see if the wear rates improved.

In short, it's not a major improvement but it is an improvement.

Nader Fotouhi

I think that you should use a stock 968 valve. FWIW, I have converted my S2 to M030 set up using 951S front spindle/hub/rotor/ caliper. I have the 5/33 valve that is used on 951S, but have not switched and my car does fine. Also, I do not know whether you converted to ABS, but when my ABS goes off, I get rear brake lock up under threshold braking which is not a pleasent experience.

FredC

ah, that is what happened between you and Gary at NJMP !!! ;-)

Bill Verburg

If you want to get really precise, these valves just limit line pressure by a specified % above a certain trigger value called the knee.

Porsche has used 46% reduction of line pressure above 33 -60 bar knee line pressure for most of it's cars from '90 on

us commoners just call them proportioning valves

a true proportioning mechanism would include dual differentially sized m/c piston sized for front and rear and/or a mechanically variable method for actuating the m/c's in addition the the native biasing mechanism of large front piston area coupled w/ small rear piston area

Geoffrey

Thanks Bill

mikew968

Tim:

I think you might want to run the 928 valve or at least talk to paragon about it. Do you have ABS?