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08-06-2011, 04:52 PM | #1 |
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Should I use drilled Performance rotors for track or street?
I bought a second set of rotors to use with track pads so I won't have to bed them in over and over. The new rotors are drilled and slotted BMW Performance rotors because they cost less than stock. My instructor today said drilled rotors suck and I should use them for street and the stock rotors for track. Does anyone agree or disagree with that?
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08-06-2011, 04:54 PM | #2 |
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Drilled rotors crack rather quickly when under stressful use (on the track). Either use stock rotors or slotted rotors on the track.
Slotted rotors have the same cooling effect as drilled without leaving you as vulnerable to cracking
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08-09-2011, 02:58 PM | #4 |
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drilled - best cooling, allows gas expulsion, generally lighter, cracks easily, wears pads a bit faster, looks fancy
slotted - good cooling, allows gas expulsion, won't crack, wears pads a bit faster blank - no cooling advantage, does not allow gas expulsion, won't crack, normal pad wear use your new rotors on the street. oem rotors will be fine for the track until they're worn out, then go for some slotted rotors. slotted/drilled rotors will wear pads a tiny bit faster. what pads are using on/off the track? |
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08-09-2011, 04:38 PM | #5 |
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Thanks. I'm currently using Cool Carbon S/T for street and track. I ordered Hawk DTC-70/DTC-60 for track, or at least for particular tracks that have long fast straights.
I also ordered BMW Performance front rotors and regular BMW rear rotors. The Performance front rotors are $247 with free shipping from ECS, which seemed too good to pass up. I'm a little disappointed about not getting the 3 lbs per side weight advantage on track if I use the drilled rotors for street, but I guess it's not that big a deal. Meanwhile it sounds like RacingBrakes might have two piece rotors for us next year. If they do, I'll be upgrading to those in front for sure when they're available. |
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08-09-2011, 08:13 PM | #6 | |
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Quote:
Last edited by fourtailpipes; 08-10-2011 at 03:47 PM.. |
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08-10-2011, 06:17 AM | #7 |
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Besides what everyone else said, the drilled rotors have less mass so you may notice it's more willing to accelerate if the weight savings isn't marginal. I would do what your instructor advised. You would have to work your rotors hard to get then to crack, but you should still use the stock blank rotors on the track.
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08-10-2011, 05:43 PM | #8 |
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An instructor told me that just a few weeks ago. Anyway, that's what I'm trying to do. Thanks.
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