WHB Porsche

If you pay for a full year of my tuition, I'll buy you a brand new set of rotors AND pads!

mikymu

Yup, I may get a set of the rear stoptech rotor once I burn up my OEM steel rotors

Deal!! It's a community college right?

mikymu

Ok, here are the final break down on stoptech rotor weight from David Zeckhausen. The "DRK" or direct replcement kit are as follow:

Front Rotor

22.1 pounds total per rotor assembly
380x35mm AeroRotor: 19.4 lb
Front hat: 2.15 lb
Mounting hardware: 0.2 lb

Rear rotor

15.9 pounds total per rotor assembly
345x28mm AeroRotor: 12.5 lb
Rear hat: 3.15 lb
Mounting hardware: 0.2 lb

"A Trophy BBK (Big Brake Kit) is simply a variant of the normal StopTech BBK, with the following differences:
1. Calipers and hats have a natural anodized finish
2. Calipers weigh about 20% less due to material being machined away and due to a different mechanism for holding the two halves together
3. In addition, Trophy Race kits come with no dust boots, no pads, and have no anti-rattle hardware in order to allow rotors full float

The Trophy BBK rotors weigh exactly the same as the non-Trophy rotors.
The AeroRotors are the same. The only difference is in the finish on
the aluminum hats. Instead of black anodizing, it's the same natural
anodizing (plus some cool laser etching) as the calipers.

The front kit uses 380x32mm AeroRotors and, combined with hats, is about
21 pounds each.
The rear kit uses 355x32mm AeroRotors and combined with hats is usually
18 pounds, but you might need to add one more pound for the heavier hat
that doubles as the drum for the parking brake."

In another word, the Stoptech rotors are light but NOT lighter than PCCB

Nizer

I thought STRs were lightest Stoptech option unless you went the carbon CCB route? How do the DRK, BBK, and STR kits compare and what are the weights for same components? What we really need is a table comparing all components so that we know we're talking apples to apples.

mikymu

What I am looking for is the rotor weight. Stoptech trophy sport or ST-60 has lighter caliper compare with our OEM setup but it does not have lighter rotor compare with PCCB as stated above

I have no information on stoptech's ceramic rotor ... does not look promising as far as fit and price. I will ask Dave Z to see if he has any info.

Nizer

Well that was a fantasy to begin with and completely ignored material science.

What we need now is the rotor assembly weights for '10 GT3 stock brakes to verify exactly what the weight savings are vs OEM.

Nizer

Just to put the carbon vs iron disc debate in perspective, here's the Brembo technical specs catalog. It shows 380mm x 35mm iron disc weight as 9kg (19.8lb) while a 380mm x 35mm carbon disc is 3.22kg (7.1lb).

http://www.racetechnologies.com/imag...talog_2009.pdf

Additionally, here's a good technical discussion of brake performance that debunks the steel disc myth (see Myth #2):

http://www.stoptech.com/tech_info/wp...rakedisk.shtml


So, while I trust that StopTech and Brembo are capable of making cast iron disc systems that are lighter than the stock Porsche units, there's no way that any cast iron system is going to come close to matching weight of carbon systems.

GT3

Right.
Im very interested in the statement made earlier, that StopTech has carbon rotors that are supposedly significantly lighter than PCCBs...

mikymu

Nizer, you are right about cast iron disc heavier than ceramic - it's a given

Well, I got word back from Dave Z that Stoptech is in the testing phase for their carbon ceramic disc with with directional AeroRotor-style
internal vanes. No word on price or release date. Most likely couple years ... IMHO

SDGT3

Does anyone know what the difference is between the PCCB caliper and the steel. I know the 997.1 GT3 had a different size front rotor but that is not the case with the 997.2 GT3. I was told that you could use the PCCB calipers on the steel rotors with the right pads.

Bob Rouleau

There is a great thread in the 997 forum about swapping PCCB for Cast Iron (Girodisc) and the PCCB assembly (including top hats) is 10 lbs less per wheel compared to the two piece Girodisc rotors with aluminum top hats.

rickg87

How about these:
http://www.design911.com/Porsche/997...-cmo117-ct344/

SDGT3

Thanks for the info. Have you used the Ceramic Cast Iron rotors they are selling. Looks to be about $1000 each with the conversion.

rickg87

No, My dealer was to look into them for me. My concern is if I keep tracking the car PCCB's will wear out. I dont want to spend OEM $ to replace them.
Should I buy something like these and save the PCCB's for when I sell the car or stop tracking it. OR, wear out the PCCB's and replace with these less expensive
options later. What will resale be like with these aftermarket replacements.
I dont feel like shelling out he 5K right now to do it.

997gt3north

- since mentioned both "sell" and "resale" - this must be an issue for you

- therefore, switch to irons and keep the ceramics for selling time

- selling a car with yellow calipers and iron rotors will likely cost you 10k at selling time as it will speak of a car that has been heavily tracked