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Old 01-29-2004, 03:22 PM   #1
bmw325ix
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cross drilled rotors

hey i was wondering if any of you guys have had any experience with cross drilled rotors on an e30 and if those are better than slotted
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Old 01-29-2004, 03:36 PM   #2
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slotted will TEAR up your pads.... unless you are racing your car on the track and will be changing your brake pads every 2/3 races... then... you have no need for slotted rotors...

cross drilled is the way to go...

Mike.
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Old 01-30-2004, 01:03 AM   #3
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i have cross drilled and am happy with them, but my pads, shiiiiiiiiiiiiiiiiiiiiiiii#. so much brake dust, but they stop on a dime.
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Old 01-30-2004, 01:04 AM   #4
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oh yeah they look cool too.
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Old 01-30-2004, 06:30 AM   #5
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is it possible to drill your own holes and get satisfactory result?
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Old 01-30-2004, 10:08 PM   #6
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Quote:
Originally posted by toffa182
is it possible to drill your own holes and get satisfactory result?
Wow..I'm not really going to comment, I think you already know the answer.

Well, so I won't be an ass, you can have new rotors drilled by a specialist and have the same effect, HOWEVER, those rotors will be VERY susceptible to stress cracks and they won't last nearly as long as x-drilled from brembo or zimmerman.

Brembo x-drilled rotors are drilled into the rotor and then go through a series of heat and chemical treatments to reduce susceptibility to stress cracks. The holes are cast into the rotors in Zimmerman's rotors for the same purpose as brembo's heat treatments. No matter what, x-drilled rotors won't last as long as regular rotors, but they will reduce pad fade and improve brake stopping distance as well as stopping distance consistency. Holes allow for gas, water, and pad dust to escape as well as improve heat dispersion.

Slotted rotors "eat up" pads because the pads "bite" into the edges of each slot. The slots also allow for gas to escape and etc... Slotted rotors are ideal for track and school use but will wear your pads faster.

Everything depends on your application. Remember rotors are meant to be replaced on an consistent basis, so slotted and/or slotted rotors will perform better than standard rotors, you just have to make sure to replace them as needed.

Aesthestics are important to some, myself included, so x-drilled rotors are good for the street and occasional auto-x use, as well as looking nice. I would not recommend slotted rotors for street use.

BUYER BEWARE...Brembo x-drilled rotors are GOLD in color. The silver cross drilled rotors for sale on ebay that say brembo are not brembo drilled rotors. They are brembo rotors, but the seller has the holes drilled by a separate company and they are not heat or chemical treated. Recommend to stay away from these, you get what you pay for.
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Old 01-31-2004, 07:32 PM   #7
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what i meant by saying "drill your own holes", was to take the rotors to someone who has the proper hardware to perform the drilling. i could have said that in a better way, i see that now

but thanks anyway!
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Old 02-01-2004, 01:20 AM   #8
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i have bav auto crossdrilled/slotted, no problems with pad where at all
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Old 02-01-2004, 07:19 AM   #9
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I have had them both.

X-Drilled = Less rotor to pad contact!

Slotted =
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Old 02-01-2004, 02:56 PM   #10
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Quote:
Originally posted by M50E30
I have had them both.

X-Drilled = Less rotor to pad contact!

Slotted =
Are you saying slotted rotors do not have reduced pad contact? The pad doesn't have any contact with the grooved portion of the slotted rotors so it suffers the same reduction of contact.
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Old 02-02-2004, 11:50 AM   #11
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Quote:
Originally posted by jmalixi
Are you saying slotted rotors do not have reduced pad contact? The pad doesn't have any contact with the grooved portion of the slotted rotors so it suffers the same reduction of contact.
Slotted rotors do have reduced pad to rotor contact but alot less than X-Drilled. With X-Drilled rotors there are always holes constantly passing beneath the pad. And for slotted it sweeps pass the pad.

Look at F1 cars. No slots no holes...just a solid vented rotor. I personally choose slotted over x-drilled since x-drilled felt worse than a stock solid rotor.

So if you want performance out of your braking system save your money and upgrade the brake lines to braided stainless steel lines (to reduce brake fade), good pads, and a harder rotor (solid/vented or slotted/vented).
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Old 02-02-2004, 12:05 PM   #12
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M50E30, thanks... that makes sense.
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Old 02-02-2004, 12:24 PM   #13
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Quote:
Originally posted by jmalixi
M50E30, thanks... that makes sense.
No problem. I don't care if i'm wrong...I just wish there was actual FACTS on this topic than personal preference.

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