993 Callipers on 911...???
09-22-2011, 01:56 PM
#16
I have received two interesting quotes from Patric Motorsport:
One using 993 Turbo front callipers and floating rotors, and special rotor hats for the 993 Turbo rotors. And 964 or 993 rear callipers machined to fit the 911 trailing arms, with 930 rotors. The set up is quite expensive, but probably the best you can get (unless you buy a complete set of new Brembo brakes for twice the price).
One using 993 Turbo front callipers and floating rotors, and special rotor hats for the 993 Turbo rotors. And 964 or 993 rear callipers machined to fit the 911 trailing arms, with 930 rotors. The set up is quite expensive, but probably the best you can get (unless you buy a complete set of new Brembo brakes for twice the price).
My "dilemma" is that I already have a set of 993 C2 callipers available, and they don't fit with the front set up from Patric. The 80-89 930 rotors have the same dimensions as the 993 C2 rorors, 304mmx32mm. Do floating 930 rotors exist, and if so, would the rotor hat for the 993 Turbo rotors fit a 930 floating rotor? If so, I would be able to use the 993 C2 callipers all around, and save close to $1,500. I will ask Patric Motorsport...
322x32 883RS/tt left 930 304x32 right
early 930 floating 304x32 w/ VCI flAT 911 hat
322x32 Coleman w/ floating hat, also available in 304x32 w/ flat 911 hat
Brembo 930, 304x32
09-22-2011, 02:02 PM
#17
I too have been concerned with cracking. I've experienced a few track cars that would start cracking early on in their service life. Decent venting was in place (with temp paint)and on 964s with big reds. At a glance the rings (of saturn) were normal, but appeared after the first couple of days. At closer inspection the cracks were there and seemed to propogate quickly. IIRC, Porsche recommended replacement of the rotor when these cracks reached 2mm and that seemed to be where the cracks stopped. They worked fine after that, but was a concern. Again, IIRC frozen rotors performed about the same.
In the context of this thread, is my experience consistent with others? When is rotor replacement warranted; Crack length?
Just curious for my own edification and perhaps that of others here.
In the context of this thread, is my experience consistent with others? When is rotor replacement warranted; Crack length?
Just curious for my own edification and perhaps that of others here.
7mm or longer
connects holes
reaches and edge
All the holey rotors will crack in the first few track days, they then gradually get long and wider
the problem is heat so it's mostly just the fronts where the issue is, I get ~ 60days on rears, then they are worn out but the cracks are still under the 4mm.
09-22-2011, 05:33 PM
#19
Rennlist Member
The 993 calipers and 309 x 32 front rotors I run were a great mod. Im sure I am not easy on brakes, and I just don't worry much about them, save for regular flushes and keeping good pads on-which is not tough-they last a long time now.
