Phil R

The 44 I recently purchased came with track pads but I just ordered a back up set of front plain Zimmerman rotors and RS-14 black pad.

how long can I expect rear pads to last compared to fronts? what compound should I run in the rear for track use?

my first track event in this car is a 3 day event so I must make sure I wont run out. can i just leave the street pad on in the rear?

HansB

I use Pagid Orange F/R. R last a full season (40h) F about 10h.
F you need brake cooling, otherwise even Pagids are gone in 1-4 hours

Oddjob

The event at Road America? I would not run street pads there, even in the back.

In general, you will get 2-3+ times more pad life out of the rears, than the front. Probably similar difference with rotor life, too.

What rear prop/bias valve do you have?

Phil R

I think I'll call back and order a set of rears. I hate to be that guy running around trying to buy pads off someone.

What rear prop/bias valve do you have?

I have the s4 bias valve to go with the s4/ turbo s front brakes.

jerome951

Phil, for the mods your car has, you'll be going pretty quickly. Definitely don't risk overheating the rear pads by using a street variety.

I use PFC97 and use 1 rear set per 3 front sets.

333pg333

The valve is the 5/33 rear proportioning one. Using this should increase rear pad wear, but you'll still get double the life out of them.
Just get some PFC's for front and rear for the track. They are brilliant. I run 01's f and 97's rear.

Oddjob

Well, thats why I asked. The Turbo S and the 928S4 use the same 18 bar valve that a standard Turbo has. The 33 bar valve, which came on the 944S, is a 928 part number, but from older 928S (-86).

Phil R

We// the po changed the bias valve so it is likely the 33bar one i guess. I'll check to the part number. thanks

shiners780

I use the same compound front and rear, with the fronts lasting 5 days, the rears lasting 10 days.

Phil R

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Well, that's why I asked. The Turbo S and the 928S4 use the same 18 bar valve that a standard Turbo has. The 33 bar valve, which came on the 944S, is a 928 part number, but from older 928S (-86).
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so from what you say here jim, It sounds like the po should not've needed to change out the bias valve. I think I'm a little confused

333pg333

Jim is right as usual. The 928 bias valve is a popular upgrade to help balance the brake bias more to the rears. In essence this should help with dive under heavy braking. That's the idea. Of course spring and shock rates play their part too. Some guys swear by it. I can't say I've noticed a huge difference but I've had such an intermittent track life over the last year, it's hard to tell...