_rocket

Are these 2-piece brakes floating type? Normally, floating brakes have bolts all the way through, but it appears that the new GT3 brakes only have bolts behind the rotors (hidden) so they must be fixed type, right?

Carrera GT

That rotor looks decidedly "odd" to me. The drill pattern is more dispersed than previous rotors and the outside edge is somehow dirty (maybe some chemical to stop rusting on show cars) but the outer drill holes seem precariously close to the edge. Also, assuming that's a 19" wheel, that rotor's on the front and doesn't seem to be 380mm (just eyeballing compared to CCBs.) The hub/flange of the wheel seems to be deliberately designed to obscure the rotor hat, but I'm guessing what's behind there is the usual Porsche two-piece design. I think Brembo has licensing for the McLaren "noiseless" floating hardware, but I don't know that I've ever seen them use it in their OEM parts (factory fitted) for Porsche. At the price point of the car and CCBs now being a pretty well "proven" technology, I think the iron rotors are a demerit (and yes, hard core track junkies can shelve the ceramics for resale value.)

am722

I noticed that as well--those are easily 2mm closer to the edge than I've ever seen on rotors before.

MJones

FWIW
Webspecial says:
"new two piece brake discs"

I notice that the calipers are not clocked as far as the previous version.
Perhaps they are using the same upright as the PCCB

Carrera GT

I was wondering the same thing. Too lazy to compare actual photos ... : )

_rocket

I hope you are right, but the following pics are patented McLaren hardware (on Brembos), which doesn't look anything like the new GT3 top-hat (bell) shown above.

stout

Looks like the steel-rotor-on-aluminum-hat-via-vanes setup BMW uses on E60 M5s... but hard to be sure from that pic.

Hub is cast in aluminum with vanes sticking out like rays from a cartoon sun. Steel rotor is then placed over the vanes. No bolts, and it can expand as needed. Interesting tech, but I first saw it on a 500-hp car with single-piston calipers...

pete

TripleM

[QUOTE=_rocket;6366683]Are these 2-piece brakes floating type? Normally, floating brakes have bolts all the way through, but it appears that the new GT3 brakes only have bolts behind the rotors (hidden) so they must be fixed type, right?

yes they are aero rotors, should hv improved heat dissipation effect
this rotor is similar to the one used in BMW M3s

Here is the pic , taken from TMS

TrackDays247.com

Call those rotors "track time bombs". The original pictured rotors at the top of the post -

Bad news!

Craig
www.Rennstore.com

_rocket

At the rennteam forum, username 'fritz' made an interesting post about the brakes:

ChrisGB

On the 997.1 GT3, the drill holes nearest the outer edge are not actually holes on the OEM steel discs - they are shallow and don't go all the way through, so don't crack. Presumably it's the same with the new ones for the 997.2. Sorry if I'm just stating the obvious!

GrantG

Craig, can you describe what types of failures you've seen?

TrackDays247.com

That replacement rotor pictured at the very beginning of this thread is a VERY POOR design. Maybe...

The outer holes are much too close to the edge, and if that car sees moderate to hard track use --- good luck. NOW....if those holes do not go through the rotor - and upon looking even closer at that one picture it appears they do not - then it is a much better situation.

I still don't like multiple perforations that close to the edge - even a properly slotted rotor has the slot depth taper towards the finish of the slot on the outside portion, stopping an adequate amount from the edge.

And I'm never a fan of rotors which have holes in them, anyway.

And, as always, beware of the cheapie Chinese rotors that popped up starting in 2008.


* I am now carrying GT2/GT3 Brembo replacement rotors as well as the affordable DeMan rotors for 996 & 997 GT3*
IMO, either of these are the RIGHT way to "upgrade" the OEM rotors of a 996 GT2/GT3

_rocket

Thanks to the recent '2008 Cup Car' thread, just look at what brakes cup cars are using...

911rox

These are in fact a 1-piece unit unfortunately... confirmed by the chief designer dude in the DR interview...