karmx7

I've got some P50 pads that I will be using for track days and I've read varying opinions about using P50 pads on the street (from don't do it to it's OK). I was curious if, for street use only and not track use, if anyone has and run the stock P40 fronts and left the P50's in the rear? I haven't used the P50's yet so I don't know what that combination would do to the brake balance but thought I'd ask.....

The fronts are pretty easy to change back and forth but the possibility of stripping the threads in the carrier at the rear has me a bit concerned about doing it repeatedly.

Keith

Izzone

I am currently using P50 for track......on the street they are dangerous

savyboy

1. With new rotors with pristine finish, the P50 will have less initial bite than P40 when cold and/or wet. Be aware or expect to experience a Code Brown.

2. With rotors that have some track miles, and have roughened up a bit, the P50's work fine when cold. That is because your rotor surface is now like sandpaper

3. Running different coefficients of friction front/rear is a bad idea. Thread stripping is much more of a possibility if you A: Use an air tool for removal/install. B: Don't carefully blow out the threads and clean them out with, say, Sprayway glass cleaner. C: Refuse to use a torque wrench to tighten.

I just leave my P50's in place.

cfjan

Regarding the "different coefficients" comment, while I agree that one shouldn't randomly mixing them, having different coefficients, as long as done in the right way, is fine.

The motorsports pads for the 6GT3 PCCB are actually P50 front and P40 rear, for example.

I think as long as we have more braking up front, it is fine. (Might not be perfectly optimal, of course..) We don't want more braking on the rear to create instability.

mkozink

I agree. Brake bias front to rear is the key to this equation. While I have not mixed P50 & P40, I routinely ran Performance Friction (PFC) 01 in the front and PFC 97 in the rear on my C5 Z06 with Stoptech BBK. Do the same on my VW track car.

Bob Rouleau

On my 996GT3 with iron rotors I got better braking, improved balance and better front rotor wear by using RS 29 Yellow in front and the more aggressive RS 14 black in the rear. This is a popular set up for the 996 GT3. Later models saw improved balance - rear rotors do more work but those damned monobloc calipers which require removing the caliper to change pads #@!@#. I wonder if the same idea works on the PCCB version of the 996?

cfjan

On the 6GT3 w/ PCCB, the rear rotor grew from 330mm to 350mm. So Porsche is certainly dialing in some more brake bias to the rear there (assuming other hardware remained the same).

911SLOW

^ Exactly I want more front bite on a 6 with PCCB.

cfjan

John, you ever tried the motorsport combo? P50 front and P40 rear?

That's what I run at track and it definitely has more front braking than rear (although I can't comment on how that compares to the P40 front and P40 rear setup..) I run street tires now so the brake can easily overpower the tire.. and I would chirp the front tires (just barely) while no chirping on the rear..

911SLOW

No.
Since my last thread on the subject, I gave up and decided to revert to my old technique of not braking at all. When I have to I just try not to thing about it and just catch the tail.