[Z06] Z07 Performance Option
07-03-2011, 08:06 PM
#21
Drifting
My Z was recently built and this was my concern. But I figured the problem was old enough that it would be corrected by now. I figured a bad batch of rotors or something w/ the 2010's. But I was wrong. should have known better w/ GM. So i spent all this money and now have to play w/ a service department for something they know about.
07-04-2011, 08:48 AM
#22
Le Mans Master
07-05-2011, 08:58 PM
#24
Just to clarify as it has already been stated, this is a rotor balance issue from the plant. Carbon ceramic rotors don't wear anyway, but they do oxidize if run at extreme temperatures for any periods of time.
07-06-2011, 03:41 PM
#25
Team Owner
My understanding is that they do wear. Where a cast iron rotor is stamped from the factory as to the minimum thickness, the carbon ceramic rotor has to be weighed to see how much wear it has. That minimum weight is stamped on the rotor( I believe it is ~12.85Kg, but could be wrong) but is unique to each rotor. If they don't wear, why is it required to stamp a minimum weight on the rotor, and replacement is required if the rotor is under that weight?
Last edited by JoesC5; 07-06-2011 at 03:48 PM.
07-06-2011, 04:27 PM
#26
My understanding is that they do wear. Where a cast iron rotor is stamped from the factory as to the minimum thickness, the carbon ceramic rotor has to be weighed to see how much wear it has. That minimum weight is stamped on the rotor( I believe it is ~12.85Kg, but could be wrong) but is unique to each rotor. If they don't wear, why is it required to stamp a minimum weight on the rotor, and replacement is required if the rotor is under that weight?
Chris
07-09-2011, 02:19 PM
#27
Team Owner
It is not "wear", it is oxidation that is the enemy of carbon ceramic. Oxidation is the reduction and conversion of carbon atoms to CO2 (1 carbon + 2 oxygen = 1 CO2), which just floats away. As carbon is reduced, the weight decreases to eventually the lowest acceptable limit. Below that limit, the oxidation is usually getting pad enough to be very abrasive on the pads, chewing them up quickly. But even at minimum weight, the thickness will be the same as new. And, since the ZR1 rotors are made from a 3-piece laminate (for a simpler term), they cannot be reground like a 3D weave construction can be. They must be replaced instead.
Chris
Chris
I will say the rotor is worn out and you can say it's oxidized out. Either way, the rotor is past it's useful life, whether through mechanical abrasion or chemical reaction.
My point was that the carbon ceramic rotor wears/oxidizes and that wear/oxidation can cause the rotor to be out of balance because of uneven wear/oxidation.
Last edited by JoesC5; 07-09-2011 at 02:34 PM.
07-09-2011, 07:22 PM
#28
Same thing. When a carbon ceramic rotor reaches it's minimum weight it has to be replaced just as when a cast iron rotor reaches it's minimum thickness it has to be replaced.
I will say the rotor is worn out and you can say it's oxidized out. Either way, the rotor is past it's useful life, whether through mechanical abrasion or chemical reaction.
My point was that the carbon ceramic rotor wears/oxidizes and that wear/oxidation can cause the rotor to be out of balance because of uneven wear/oxidation.
I will say the rotor is worn out and you can say it's oxidized out. Either way, the rotor is past it's useful life, whether through mechanical abrasion or chemical reaction.
My point was that the carbon ceramic rotor wears/oxidizes and that wear/oxidation can cause the rotor to be out of balance because of uneven wear/oxidation.
Also, I've worked closely with carbon-carbon and carbon-ceramic brakes starting starting back in 1990 and I've never seen oxidation cause noticeable balance issues. The effects of rotors oxidation normally exhibit one of two symptoms: 1) Premature pad wear (due to acting like sandpaper) or, eventually, 2) spontaneous catastrophic failure (explosion).
Keep in mind that while iron and CCM (or C-SiC) rotors are meant to do essentially the same thing, they do it in rather different ways and with different results. Each has its own pros and cons, but they are rarely easily interchangeable. Lots of changes need to be made to accommodate the differences require for optimal use.
Chris
07-09-2011, 08:17 PM
#29
Safety Car
Fewer carbon ceramic brakes will be produced in 2012
For 2012 GM revised the option packages. For normal street-driven Z06s that see some miles you order the new F55 package which combines the 19/20 PS2s, new lightweight wheels, the magnetic suspension, with Z06 steel rotors. The 2012 Z07 package now includes the sticky but fast-wearing Cup tires. Now you can't get carbon ceramic brakes without Cup tires. The 2012 Z07 will be a great performer for serious drivers. F55 will be for people who put miles on their Z06s. Z07 will now require the CFZ package, the side skirts deflect some of the stones picked up by the sticky tires (F55 can be ordered without CFZ, it has the same tires as Z07 had in 2011).
07-09-2011, 08:46 PM
#30
Advanced
Member Since: Jul 2011
Location: Orange NJ
Posts: 61
Likes: 0
Received 0 Likes
on
0 Posts
Interesting. I've been thinking about upgrading to zr1 brakes. Hadn't seen this issue. Do they make steel replacement rotors for guys that track their cars like Porsche track guys do?
07-09-2011, 09:26 PM
#31
If enough people are interested, I can run a cost and feasibility study to see what it would take to make a batch of iron replacements.
07-10-2011, 12:04 PM
#32
Drifting
That would be one big front rotor, and I'm sure pretty heavy. You can buy Zo6 brake packages, rotors, and calipers, from 1600-1900 as alot of guys upgrade from standard vette brakes. I guess this would be a downgrade!1 LOL
07-10-2011, 07:24 PM
#33
Melting Slicks
My CFZ ZO6 without the ZO7 package was delivered out of allignment with all four tires substantially out of balance. Took a great service dept to figure it out.
No more problems
No more problems
