Order new rotors and run the old ones till they really crack. Surface cracks are fine - they'll heal when the rotor heats up again. Just take a few slow laps around the pits after a session to cool the rotors slowly, like the Corvette guys do.
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BThayer23 Well-Known Member
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countryboyshane New Member
Hmmm, looking for someone who beats them up on the track all the time. Thank you for the input though.
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I don't replace a rotor till it cracks through the edge. Surface cracking is normal.
Talk to Todd at TCE. He has a custom order for me (Alan Wolfe) from Coleman. I believe they are both chemically and heat treated.
These are the ONLY rotors I can keep on the car till they make min thickness. I have tried Coleman, Wilwood GT, Coleman Race, and others before Todd helped me out. Cracked them all.
I run 12x1.25, but I believe Todd can get them in any size. But be prepared - they are ~ $200 each. I used to run the DTC-60s at the track as well, but now use the DTC-70. -
countryboyshane New Member
I have a handful of cracks on mine that are about 2mm away from the edge and are are quite thick. My next event is a 2-day so I don't want to be the sucker who pushed his rotors too far.
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Crashton Club Coordinator
Saving bucks on rotors could be quite expensive. Money spent on brakes is well spent. Just my 2 cents.
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countryboyshane New Member
I'm going to try a set that's not treated and give it a go. Some other local track rats have given me a mixed bag of opinions too. Some even work in the material sciences field and are on the fence but no one has done a comparison. I'm willing to test the waters. Everything else I've read is the same repeated story. "The last X times longer!" With regard to brake failure I'm more worried about fluid boiling and brake fade. Since I'm running Motul RBF600 and race pads I don't really worry about any of that anymore as long as things are bled close to show time at the track
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And for reference my car goes to the track 12 to 14 weekends a year, that's 24 to 28 track days a year. I was cracking the rotors in 3 or 4 weekends. Buying 3 to 4 sets of rotors a year wasn't acceptable, so I bit the bullet.
I don't blame you for trying the cheap route. But if that doesn't work you know who to call. -
countryboyshane New Member
I'll have to post a high resolution picture of the rotor just so everyone gets an idea of the microfracture sizes and can zoom in on things. I think my idea of what's acceptable or unacceptable might be skewed from some of our more experienced members on the forum. Might be a few weeks since I'm out of the office a bunch this month.
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Then I saw one with a chasm all the way to the edge; a true failure. -
Thanks k
I went and found these on the old computer:
This is a cracked Coleman Race Rotor next to a new Wilwood GT
Cracked Wilwood 6903 close-up
Cracked Wilwood 6903
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Detroit Tuned Well-Known MemberMotoring Alliance Founding Sponsor
Shane is running the Detroit Tuned Big Brake Kit in the 17" kit and due to his track weekends we highly recommended to him to Cryo the rotors as they last twice as long. We have had several of our customers go thru many sets of rotors till they switched to the cryo set. They would last twice as long or longer depending on the person and there braking style. We recommend it for anyone that does even just a few track weekends a year or even a very aggressive street driver with a more aggressive pad.