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      02-05-2013, 12:06 PM   #1
dmw16
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Is Cryo Treatment Worth It for Rear Rotors?

Heading into my first track season I'm pretty much set on buying a set of blank rear rotors since I've heard that the E46 ZCP drilled rotors aren't great for track duty.

Tirerack has plain blanks for $58 each and cryo treated blanks for $82. Is there any real benefit for track applications to the cryo treated rotors?
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      02-05-2013, 12:16 PM   #2
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I wouldn't bother for rears, rear brakes last forever. There is at least some evidence that cryo makes rotors last longer, but for rear it is not necessary.
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      02-05-2013, 12:18 PM   #3
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Originally Posted by Porschefile View Post
I wouldn't bother for rears, rear brakes last forever. There is at least some evidence that cryo makes rotors last longer, but for rear it is not necessary.
So is this a case where I shouldn't even worry about my rear rotors? I am just suspect of the ZCP rotors and they are about 2mm over min-spec thickness. I'd hate to have them warp and then be in a pinch of needing new ones at the track.
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      02-05-2013, 12:32 PM   #4
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Never owned a E46, but I can tell you that I left the stock rears on my E92 even with Stoptech bbk up front and it works great (and I'm hard on brakes). I would change pads to stoptech street performance or real race pads though.
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      02-05-2013, 12:47 PM   #5
dmw16
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Quote:
Originally Posted by Porschefile View Post
Never owned a E46, but I can tell you that I left the stock rears on my E92 even with Stoptech bbk up front and it works great (and I'm hard on brakes). I would change pads to stoptech street performance or real race pads though.
Thanks for the info.

I bought a Stoptech ST40 355mm front kit and bought PFC01 pads for the front and back.

For $135 for a set of regular blank rear rotors I decided it's worth the peace of mind to know that if my ZCP rear rotors warp I have a set of new ones in my track tool kit.
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      02-05-2013, 02:24 PM   #6
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I tacked my E46 for 7 years and only needed to replace the rear rotors once. I was using stock rotors. I would not worry.
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      02-05-2013, 03:37 PM   #7
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Rear rotors will be fine. Most people claiming to have "warped" rotors actually have uneven pad deposit which can be corrected relatively easy with re-bed when pads are cold and abrasive.

I replace my pads on the front 3 times for every rear pad replacement, which is another way to say rears should be fine.

This is for E46 M3 with pagids and slotted rear rotors.
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      02-05-2013, 03:41 PM   #8
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Cryo rotors are a scam.
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      02-05-2013, 03:57 PM   #9
dmw16
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Thanks again everyone for all the info.

I ended up getting a set of regular blanks for the rear for $135 to replace my ZCP rotors which have a decent amount of miles on them. For that amount of money I figured I can't really go wrong and I'm glad I didn't spring for the cryo treated ones.
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      02-13-2013, 08:00 PM   #10
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Quote:
Originally Posted by dmw16 View Post
Thanks again everyone for all the info.

I ended up getting a set of regular blanks for the rear for $135 to replace my ZCP rotors which have a decent amount of miles on them. For that amount of money I figured I can't really go wrong and I'm glad I didn't spring for the cryo treated ones.
Great choice!! There is statistical evidence showing that cryo rotors last slightly longer than non-treated ones. But it's definitely not worth the extra coin..
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      02-13-2013, 08:59 PM   #11
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Skip the deep freeze IMO...spend the money on something else...like food/water at the track so you don't BONK and wreck your car! That's money very well spent...IMO.
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