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Suspension & Braking Forum by BimmerWorld
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Old 05-29-2011, 09:25 PM   #1
ZHud3
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slotted vs drilled

im upgrading to 330 calipers and rotors on my 323. I see drilled, slotted, and drilled and slotted rotors. WTF do they do and which will better suit me. i use this car as a daily driver and im looking for just a little performance upgrade. Any suggestions?
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Old 05-29-2011, 09:59 PM   #2
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yeah use the search bar
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Old 05-29-2011, 10:01 PM   #3
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only gain you'll see is due to getting bigger rotors, and if you'd search you would find everything you need
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Old 05-30-2011, 08:24 PM   #4
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Blanks + better pads
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Old 05-30-2011, 11:14 PM   #5
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The only drilled rotors I'd run in stock 330 fitment are the BMW Motorsport rotors - only because they're a decent bit lighter and have directional cooling vanes. Otherwise I'd just run blanks... Maybe slotted if I wanted something that looked a little cooler.
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Old 06-06-2011, 08:08 AM   #6
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I'm using Zimmerman cross-drilled. They look good, but the holes are fairly small and there aren't that many of them. Stopping power is about the same as before. For $80 a rotor, it wasn't that bad of a deal.
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Old 06-06-2011, 11:39 AM   #7
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I'm using Zimmerman cross-drilled. They look good, but the holes are fairly small and there aren't that many of them. Stopping power is about the same as before. For $80 a rotor, it wasn't that bad of a deal.
mine have a good amount of holess
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Old 06-06-2011, 03:03 PM   #8
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mine have a good amount of holess

Holes are good !
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Old 06-06-2011, 05:19 PM   #9
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mo holes mo problems , slotted but do ur research
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Old 06-06-2011, 08:04 PM   #10
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mo holes mo problems , slotted but do ur research
wrong
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Old 06-10-2011, 10:48 PM   #11
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mo holes mo problems , slotted but do ur research
Thats why high end cars and Sport bikes come from the factory with drilled rotors??
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Old 06-10-2011, 11:02 PM   #12
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Thats why high end cars and Sport bikes come from the factory with drilled rotors??


Just because they are factory doesn't make them good.

Do your research.
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Old 06-10-2011, 11:31 PM   #13
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Those OEM rotors have cast holes not drilled. Drilled holes will get cracks around the holes over time with high temperature use ie tracking. It's a metalurgical thing.
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Old 06-11-2011, 10:05 AM   #14
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Those OEM rotors have cast holes not drilled. Drilled holes will get cracks around the holes over time with high temperature use ie tracking. It's a metalurgical thing.
Incorrect.

To find out more, follow this excellent advice:
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yeah use the search bar
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Old 06-11-2011, 11:00 AM   #15
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Those OEM rotors have cast holes not drilled. Drilled holes will get cracks around the holes over time with high temperature use ie tracking. It's a metalurgical thing.
1. OEM rotors are drilled, not cast, just like all other cross drilled rotors

2. I am not aware of any modern race series that uses cross drilled rotors, which should tell you something about any real benefit.
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Old 06-11-2011, 01:31 PM   #16
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Ok, how about this. Not all rotors with holes in them are drilled. The higher quality ones are cast. Drilling causes stress cracks to form around the holes over time under high temp use. Casting the rotors with holes reduces the formation of these stress cracks. Personally I would never bother spending the money for such rotors. They are simply not necessary.
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Old 06-11-2011, 02:10 PM   #17
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Ok, how about this. Not all rotors with holes in them are drilled. The higher quality ones are cast. Drilling causes stress cracks to form around the holes over time under high temp use. Casting the rotors with holes reduces the formation of these stress cracks. Personally I would never bother spending the money for such rotors. They are simply not necessary.
Still doesn't work.

All rotors with holes in them are in fact drilled. Perhaps it that is not the case for some exotic materials like carbon-ceramic that cost more per rotor than your entire car, but it is true for any rotor you can actually buy.
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Old 06-11-2011, 02:30 PM   #18
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I think cross drilled rotors look good. If you get a real company like stoptech like me or brembo and you will be fine.
And there less expensive then oem.
Good set of low dust pads and some ss lines your stopping power will be the same or better then stock for less money. Oh yea and they look cool. Also 95% less brake dust.
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Old 06-11-2011, 07:29 PM   #19
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Still doesn't work.

All rotors with holes in them are in fact drilled. Perhaps it that is not the case for some exotic materials like carbon-ceramic that cost more per rotor than your entire car, but it is true for any rotor you can actually buy.
You are more correct than you think. Carbon-ceramic rotors have holes drilled in them as well, which are done before final siliconization. There are no cases anywhere of "cast in holes". It is just another Internet myth.

Drilled holes are very useful in increasing initial pad bite at high speeds, improving wet performance and can provide slightly better cooling at elevated temperatures. HOWEVER, most drilled rotors sold into the aftermarket are poorly engineered, use low-quality castings, improper hole patterns and sub-standard finishing techniques. This has contributed to the reputation that drilled rotors crack too soon or have other problems.

Bottom line: If you are going to go with drilled rotors (which are fine for the street and very light track use), then don't skimp with the eBay, Chinese crap. Buy the good stuff! Disclaimer: Drilled rotors are not for heavy track use. Use slotted-only or, even better, J-Hook rotors instead.

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Old 06-11-2011, 07:54 PM   #20
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ive used my drilled zimmermans at the pad twice and i wasent going easy. zero problems what do you say to that?
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