Planet 9

**K-Man S** · #1 01-12-2009, 12:43 PM

Give Me a Brake! - Girodisc Slotted Rotor Installation Guide -We recently received a set of Girodisc slotted brake rotors from our sponsor RSS - Road Sport Supply - and performed both an installation and evaluation of these new rotors. You won't want to miss this article and the results that we achieved after swapping out our factory rotors at 25k miles for a new set of Girodisc rotors and factory Porsche pads.

Click Here to Read the Article

We all know that Porsches perform very well but with horspower numbers garnering the lion share of marketing numbers and television ads these days it is very easy to forget that brakes play not only a large role in the overall performance of a vehicle but in safety as well. Brake upgrades are often overlooked by those searching for more power. Individuals focused on power alone are going to have a hard time creating a well balanced street or track car without also considering a brake upgrade.

Brake upgrades typically aren't cheap, a set of larger rotors and new calipers from some manufacturers can set a buyer back $4k-$5k. I'm happy to report that the Girodisc upgrade from RSS is both cost-effective and now after our review a quantifiable performance improvement. Click the link above to get all of the details!

**blueone** · #2 01-12-2009, 01:45 PM

Yet another outstanding article from K-Man S. Truly well done. I only have two comments, one a suggestion and one a nearly irrelevant quibble. The hubs show signs of substantial surface rust. If I was doing that job I would have wire brushed the rust off (wear eye protection when doing this!) and brushed the surface with a thin layer of anti-sieze paste.

My quibble is that the calipers you used are not really the correct tool for measuring rotor thickness. You need a disc brake micrometer to clear the lip and fit into the bottom of the deepest groove. Like I said, a quibble, because with those cracks shown those rotors needed to go.

Again, very nicely done.

**K-Man S** · #3 01-12-2009, 02:13 PM

Originally Posted by blueone

Yet another outstanding article from K-Man S. Truly well done. I only have two comments, one a suggestion and one a nearly irrelevant quibble. The hubs show signs of substantial surface rust. If I was doing that job I would have wire brushed the rust off (wear eye protection when doing this!) and brushed the surface with a thin layer of anti-sieze paste.

My quibble is that the calipers you used are not really the correct tool for measuring rotor thickness. You need a disk brake micrometer to clear the lip and fit into the bottom of the deepest groove. Like I said, a quibble, because with those cracks shown those rotors needed to go.

Again, very nicely done.

I tried to find those type of calipers and no one in town had them, my father didn't even have them in his vast array of tools so I went with what I could obtain. I did my best to bypass the lip on the old rotors by taking measurements from different angles, etc. to see what I could obtain. As for wirebrushing I suppose I could have done that but it would have slowed me down even more and I was running over my time budget as it was. I can always do it later right?

Jayman · #4 01-12-2009, 04:02 PM

Nice article Ken. I would like to change my stock rotors for the slotted rotors for track events so I tried following your links to RSS but they had no info so I went to GiroDisc and according to their web site they don't make a rotor for the Cayman S or Boxster???

Girodisc high performance brake products

any suggestion on what I can expect to pay for these disc's?

beez · #5 01-12-2009, 04:15 PM

Originally Posted by Jayman

Nice article Ken. I would like to change my stock rotors for the slotted rotors for track events so I tried following your links to RSS but they had no info so I went to GiroDisc and according to their web site they don't make a rotor for the Cayman S or Boxster???

Girodisc high performance brake products

any suggestion on what I can expect to pay for these disc's?

http://www.planet-9.com/cayman-box...r-upgrade.html

brad

gtscayman · #6 01-12-2009, 04:22 PM

Originally Posted by K-Man S

I tried to find those type of calipers and no one in town had them, my father didn't even have them in his vast array of tools so I went with what I could obtain. I did my best to bypass the lip on the old rotors by taking measurements from different angles, etc. to see what I could obtain. As for wirebrushing I suppose I could have done that but it would have slowed me down even more and I was running over my time budget as it was. I can always do it later right?

Or put some shim stock on both sides to make the calipers clear the lip - don't forget to subtract the shim stock thickness!

**K-Man S** · #7 01-12-2009, 05:29 PM

As a note I heard from Greg at RSS and the rotors I received had missed going through the chamfering process on that inner lip somehow. They pulled all the rotors in inventory and checked them and any missing the chamfering have been chamfered now so future buyers should not face the problem I faced during the install. Good to hear!

**BillC** · #8 01-12-2009, 06:15 PM

So.... any chance of a group buy?

**K-Man S** · #9 01-12-2009, 06:46 PM

Originally Posted by BillC

So.... any chance of a group buy?

You'd have to ask Greg at RSS and see.

fmarshall · #10 01-13-2009, 09:55 AM

Nicely written article with great pictures!!

Slotted rotors are great for lots of track use. though they wear the pads more quickly on the street than comparable cross-drilled rotors.

FWIW, the tool that you used to measure the rotor thickness in the article is a vernier caliper. A micrometer is a more precise measuring tool.

http://www.design-technology.org/micrometer.jpg

**SilverFox88** · #11 01-13-2009, 08:09 PM

I think this upgrade will prove to be very worthwhile and am looking forward to hearing about your experience on the track. I will certainly consider it when my rotors need replacing.

I noticed on the pics of the rear installation a covering over your exhaust and was wondering what that material is. The stock pipe has a shrouding of metal as a heat shield which my Fabspeed does not. Is this something I should address?

Thanks--

**K-Man S** · #12 01-13-2009, 08:22 PM

Originally Posted by SilverFox88

I think this upgrade will prove to be very worthwhile and am looking forward to hearing about your experience on the track. I will certainly consider it when my rotors need replacing.

I noticed on the pics of the rear installation a covering over your exhaust and was wondering what that material is. The stock pipe has a shrouding of metal as a heat shield which my Fabspeed does not. Is this something I should address?

Thanks--

That is the heat shielding wrap that comes with the Capristo system. It will help keep the suspension pieces cooler, some people have reported cooking shock/strut fluid when running aftermarket exhausts with no shielding.

**Craig@Rennstore.com** · #13 02-16-2009, 01:15 PM

Heads up:

As of February 16th 2008 and with the coordination of Greg at RSS, I now carry the GiroDisc lineup at www.RennStore.com -- The source for Pagid brake pads.

Ordering and graphics coming in a week or so, in the meantime e-mail me at:
Rennstore@comcast.net

**Craig@Rennstore.com** · #14 04-25-2009, 11:50 AM

Send me an e-mail: rennstore@comcast.net for the PP price...

You will be pleasantly surprised

**Craig@Rennstore.com** · #15 02-02-2010, 10:56 AM

Ken -

Can you snap a few pics of your GIros now that time has elapsed, as well as approximate mileage and qty of track days you have on them - appreciated

jhuang25 · #16 02-02-2010, 11:34 AM

Craig, nice looking rotors! I purchased pads from you awhile back for my 996TT and they were great... when it's time for me to upgrade the Cayman, I'll definitely give you a call. You can always PM me a price now and get me thinkin...

**K-Man S** · #17 02-02-2010, 11:34 AM

I will see what I can do when it gets warmer, I have a feeling one may be warped or else shifted or loose or something as I have a vibration under braking

**Craig@Rennstore.com** · #18 02-02-2010, 11:58 AM

Nearly certain you have pad transfer, warping on a modern Porsche is virtually nonexistent, maybe this helps.

Hi Jason! Funny enough....a 996TT needs the rotor upgrade even more so than a Cayman S - those rotors are seriously undersized for the track potential of a 996TT.
So many people have problems with 996TT rotors that see track use.....

PM coming!

**K-Man S** · #19 02-02-2010, 12:58 PM

No pad transfer but definite vibration

**Craig@Rennstore.com** · #20 02-02-2010, 01:43 PM

Dial indicator with disc on car. What pads you using now? Transfer often times is impossible to see -