Go Back   PCA GT2, GT3 and Cup Car SIG Forums > GT2/GT3/Cup Car Register Discussions > GT2, GT3, RS and Cup Car Discussions

GT2, GT3, RS and Cup Car Discussions Discussions on all topics related to all Porsche GT vehicles

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-16-2011, 03:11 PM
cfjan's Avatar
cfjan cfjan is offline
Registered Porsche Owner
 
Join Date: May 2011
Posts: 9
Downloads: 0
Uploads: 0
Default Mixing PCCB rotors w/ iron rotors?

My front PCCB rotors (from my 996 GT3) are being replaced with iron rotors. My question to the group is, do I have to change out the rear as well? The shop that's working on the car wants to change out the rear too (understandably for liability reason, I assume).

Does anyone have experience running front iron rotors w/ rear PCCB rotors?

I mean, there's really no "magic" involved, right? Friction is friction. As long as the rear is not overpowering the front (that would create instability), I don't see how one can't mix the rotors. (If anything, the pad materials would be more critical, as one can run pads w/ higher and lower friction rating to change the bias)

Thoughts?
Reply With Quote
  #2  
Old 08-16-2011, 04:25 PM
W8MM's Avatar
W8MM W8MM is offline
Registered Porsche Owner
 
Join Date: May 2011
Posts: 17
Downloads: 0
Uploads: 0
Default Re: Mixing PCCB rotors w/ iron rotors?

I can speculate, but I'm not a brake engineer and I have never played one on TV.

One should be careful about line-pressure and temperature differences in the response of the two rotor materials. I can imagine a situation where the apparent brake balance could shift depending on how many laps had produced what temps. It might be slow and barely noticeable or it might be spooky quick to occur with "meaningful" differences.

Be careful
__________________
Mike

Cincinnati, OH
Reply With Quote
  #3  
Old 08-16-2011, 06:47 PM
TFENT TFENT is offline
PCA Member (Vendor Rep.)
 
Join Date: Jul 2011
Location: San Diego, CA
Posts: 9
Downloads: 0
Uploads: 0
Default Re: Mixing PCCB rotors w/ iron rotors?

Honestly, your best bet is replacing your PCCB rotors with at minimum the MovIt CER Rotors. You kill 2 birds with one stone with the CER replacements. The steels are less expensive initially but will wear out more often and do not give you the durability or performance the 997 demands. The CER's cover all bases and last a lifetime...
Reply With Quote
  #4  
Old 08-16-2011, 07:13 PM
cfjan's Avatar
cfjan cfjan is offline
Registered Porsche Owner
 
Join Date: May 2011
Posts: 9
Downloads: 0
Uploads: 0
Default Re: Mixing PCCB rotors w/ iron rotors?

MovIT would be nice but it is out of question, as cost is a major factor here..

On the 996, the rear last a long time (no PSM, so the rear brakes are not used to stabilize the car), so I am not too worry about the durability aspect.. more just that if I don't need to change it, that's more money in the pocket for other stuff..
Reply With Quote
  #5  
Old 08-17-2011, 12:37 AM
mooty's Avatar
mooty mooty is offline
Vice Advocate
 
Join Date: Feb 2011
Posts: 115
Downloads: 0
Uploads: 0
Garage
Default Re: Mixing PCCB rotors w/ iron rotors?

one of the fastest 6gt3 in CA ran pccb rear with steel fronts.
but if you want to have zero doubts, just run iron rear discs. they are not much $$$.

movit is good stuff, but until it has accumulated "lifetime" use on track, it's all educated "guesses".
Reply With Quote
  #6  
Old 08-17-2011, 09:03 AM
SH || NC's Avatar
SH || NC SH || NC is offline
Registered Porsche Owner
 
Join Date: Apr 2011
Posts: 129
Downloads: 0
Uploads: 0
Default Re: Mixing PCCB rotors w/ iron rotors?

You can run the ATEs up front and stock cup rotors in the rear for a low cost iron setup.
__________________
GT3 & TT Owners - Fix Your Fittings! (link) (link) (link) (link)

Reply With Quote
  #7  
Old 08-21-2011, 04:18 PM
AllanJ's Avatar
AllanJ AllanJ is offline
Registered Porsche Owner
 
Join Date: Jun 2011
Location: Vancouver, BC
Posts: 8
Downloads: 0
Uploads: 0
Default Re: Mixing PCCB rotors w/ iron rotors?

Quote:
Originally Posted by SH || NC View Post
You can run the ATEs up front and stock cup rotors in the rear for a low cost iron setup.
^^^ I do this now.

A while back I pulled my front PCCB due to small cracks forming and replaced with 997 Cup rotors. The front Cup/rear PCCB combo worked fine, no ill effects on the street, autox or track.
Reply With Quote
  #8  
Old 08-21-2011, 04:50 PM
PJS's Avatar
PJS PJS is offline
Registered Porsche Owner
 
Join Date: Apr 2011
Location: Seattle
Posts: 42
Downloads: 0
Uploads: 0
Default Re: Mixing PCCB rotors w/ iron rotors?

Gamroth has done it on a 996 that is very quick
__________________
07 RS
11 3500 Denali Duramax
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -5. The time now is 09:25 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Garage vBulletin Plugins by Drive Thru Online, Inc.
©2010-2018, Porsche Club of America. This site is owned & operated by the Porsche Club of America, and is not affiliated in any way with Porsche AG or Porsche Cars North America.