|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
EBC dimpled & slotted rotors review????
|
|
08-13-2009, 05:40 PM | #1 |
Lieutenant
51
Rep 513
Posts |
EBC dimpled & slotted rotors review????
has anyone had any experience with the EBC dimpled & slotted rotors on their car?
these rotors right here: i'm looking to get these for the car to replace the oem rotors. they'll be paired with some ebc red stuff pads! thanks in advance! |
08-21-2009, 04:58 PM | #6 |
Midlife Crises Racing Silent but Deadly Class
1821
Rep 5,337
Posts
Drives: 2006 MZ4C, 2021 Tesla Model 3
Join Date: Oct 2007
Location: Welcome to Jamaica have a nice day
|
"Dimples" or slots does nothing for a street application. All those dimples will do is act like cheese graters on your brake pads, reduce overall sweep area, and introduce noise while braking.
Absolute marketing junk. You're better off buying factory blanks. |
Appreciate
0
|
08-21-2009, 05:50 PM | #7 | |
Once upon a time ......
276
Rep 5,048
Posts
Drives: 2008 JB E92 - SOLD 5/2010
Join Date: Sep 2008
Location: Asti, Italy & Austin, Texas
|
Quote:
Dimpled, slotted or drilled rotors simply allow the rotor more effective cooling. The indentations on the rotor surface allow more air to flow between the rotor & brake pad surface. This also allows for less chance of brake fade with the proper brake pads in place. I also have a set of rotors (different brand) that are slotted/dimpled in use with a set of the Cool Carbon brake pads. The rotors were installed before the pads and the stopping performance with the rotors in place was noticably better than OEM. With the Cool Carbon pads installed the stopping performance between this setup & OEM is night and day. |
|
Appreciate
0
|
08-21-2009, 09:44 PM | #8 | |
Modder Raider
753
Rep 8,633
Posts
Drives: M3
Join Date: Apr 2007
Location: Surf City, HB
|
Quote:
I just did a review on my cheese graders. http://www.e90post.com/forums/showthread.php?t=292297 I must have lots of mozzarella in my wheel wells.
__________________
e36 M3 Coupe, e36 325i Sedan
e90 335i--SOLD Best 60-130-------------9.15 Seconds------------------WWW.MR5RACING.COM |
|
Appreciate
0
|
08-22-2009, 01:24 AM | #9 | |
Lieutenant
51
Rep 513
Posts |
Quote:
if all dimpled rotors do was give u cheese, then all those manufacturers making dimpled and cross drilled rotors have been making cheese since forever!!! |
|
Appreciate
0
|
08-23-2009, 01:38 PM | #11 |
Moderator
618
Rep 10,855
Posts |
I would avoid cross drilled holes because they introduce more areas that residual stresses and material flaws can result in fractures. Done right dimples and slots theoretically improve gas release at cost of slight reduction in surface area. Braking is huge for race cars. Some use complex rotor machining, some don't.
The aesthetic appeal is the link to high tech expensive caché. Sales of Brembos et al would be drastically lower if they did not have this distinctive high tech big $ look to them. Same reason Brembo offers their calipers in bright colors. M3s, Porsches, Ferraris, etc. have the 'look', so that can be worth emulating. I think they can look great if done right. In real world street driving I doubt I would notice much difference with slots or dimples. But I think they look cool and probably add a few $ to resale.
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
Appreciate
0
|
09-04-2009, 09:55 AM | #12 | |
Colonel
263
Rep 2,559
Posts |
Quote:
I have not yet had the same problem with the 335i, at least not to the same degree, also due to the fact that it has this fancy automatic dry braking function (which apparently only works if the swipers are activated). However, some weeks ago when driving under heavy rain I also noticed a slight delay in braking response and a veer to one side when braking; in Germany a number of people have already reported the same problem with the same car, independently of the swipers (= dry braking) being activated or not. I would therefore venture the guess that slotted rotors would also improve the braking behaviour of the car under wet conditions. As I'll be installing the EBC rotors in some weeks myself, I can report on this from my own experience then. Alpina_B3_Lux
__________________
Audi R8 LMX, BMW M550i xDrive (G30 LCI); gone: Alpina B3 3,3 (E46), BMW 335i, Audi R8 V10 manual, Audi R8 V10, BMW M235i, BMW 550i F10
|
|
Appreciate
0
|
09-04-2009, 10:15 AM | #13 | |||
Brigadier General
218
Rep 4,726
Posts |
Quote:
Quote:
Quote:
I don't like the hack, he annoys me, which should lend more unbias to the fact I'm about to agree with him (at least on the dimples) The point of slotted and drilled rotors is to let escaping gases escape from the area between the rotor and pad itself. A dimple is not going to do this, or at the very least not as effectively. A slot or a hole will. And he is also correct that for most street applications they are almost 100% useless as you wont have any out gassing at those temps. However, some people make repeated stops from 150+ mph on the street, and they will play a role there. None of the aforementioned designs are for cooling, at all, the only effect on cooling is the vanes themselves the airflow they receive from the center of the rotor and how effective their internal structure is, they receive no additional cooling from drills or slots, which actually only serve to decrease the maximum heat capacity of the rotor. Slots do in fact increase brake wear over a flat rotor as well. Also I can't tell if those rotors have straight vanes or curved vanes, but as far as I can tell your rotors are on backwards MR 5, the slots are supposed to contact the pad at the outer most radius FIRST and move in, not the other way around like yours are installed (assuming correct design). But before that you are supposed to install them by vane design (if curved) so that the vanes are curving toward the back of the car. Both these things are counter intuitive so tons of people put them on wrong (and even "engineers" design them wrong).
__________________
|
|||
Appreciate
0
|
09-04-2009, 10:20 AM | #14 |
Brigadier General
218
Rep 4,726
Posts |
Found something for you Mr. 5 that explains with pictures how to properly install rotors.
http://www.zeckhausen.com/how_to_pro...all_rotors.htm
__________________
|
Appreciate
0
|
09-04-2009, 11:04 AM | #15 | |
Midlife Crises Racing Silent but Deadly Class
1821
Rep 5,337
Posts
Drives: 2006 MZ4C, 2021 Tesla Model 3
Join Date: Oct 2007
Location: Welcome to Jamaica have a nice day
|
Quote:
I have spoken with my high school buddy who worked for BREMBO regarding drilled and slotted rotors. What he told me would back up my bold statement. He had flat-out stated that cross-drilling and slots, FOR STREET APPLICATION, is a pure marketing gimmick. It simply means they get to charge more for the rotor that cost the same, or less, to make. Go talk to some of the local instructors at BMW CCA events and see what they say or think about "dimpled" rotors and slotted rotors for street or track use. Now that I've shared my qualifications, might I ask, what do YOU do that makes you an expert on brakes, besides putting a few on your car and driving them up and down the street a few times? p.s.: And if you believe all that b.s. I just listed, I've got a bridge in Brooklyn to sell you too. |
|
Appreciate
0
|
09-04-2009, 11:09 AM | #16 |
Midlife Crises Racing Silent but Deadly Class
1821
Rep 5,337
Posts
Drives: 2006 MZ4C, 2021 Tesla Model 3
Join Date: Oct 2007
Location: Welcome to Jamaica have a nice day
|
|
Appreciate
0
|
09-04-2009, 11:30 AM | #17 |
Moderator
618
Rep 10,855
Posts |
Opinions / advice regarding these two-piece rotors by Stillen:
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
Appreciate
0
|
09-04-2009, 11:35 AM | #18 |
Colonel
45
Rep 2,575
Posts
Drives: '73 2002,'18 X5 35d,'17 328d T
Join Date: Jan 2007
Location: A Whale's Vagina, Ca
|
opinion ( and I know it's not what you're after) : they look like ass.
And according to the rest of the thread, you'll only see any gain from them with high speed use. useless for normal street driving
__________________
1988 E28 535is Euro Conversion --- sold 2009 E90 335 6MT --- sold 2003 E39 540iT Msport --- sold |
Appreciate
0
|
09-04-2009, 11:39 AM | #19 | ||
Modder Raider
753
Rep 8,633
Posts
Drives: M3
Join Date: Apr 2007
Location: Surf City, HB
|
Quote:
Quote:
If you read about the direction of the slots then you will see that the direction of the slots doesn't matter. it's the direction of the cooling vanes in the rotors that matter. The pictures are an example.
__________________
e36 M3 Coupe, e36 325i Sedan
e90 335i--SOLD Best 60-130-------------9.15 Seconds------------------WWW.MR5RACING.COM |
||
Appreciate
0
|
09-04-2009, 12:13 PM | #20 | |
Moderator
618
Rep 10,855
Posts |
Quote:
Street use? What does any mod really do for street use. Not much. Not like they're going to save my life by reducing stopping distance, or the tiny improvement in handling response will help me avoid an accident. I have come face-to-face with this habit we call modding, and I recognize it for the pointless money trap that it is. My strategy is to wait to mod until I am replacing parts that are worn out. 32k miles and I'm in the market for new brakes. I justify upgrades with more expensive parts by saving $ via DIY, but of course it boils down to emotion: it's my Bimmer we are talking about here! But I would still love to hear what the Hack, Mr.5 and other knowledgeable sorts have to contribute. Oooh, and while I'm at it, there are maybe 5 different companies offering stainless steel brake line sets. What are the best ones? Working our way towards a brake parts sticky here...
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
|
Appreciate
0
|
09-04-2009, 12:19 PM | #21 |
Major General
383
Rep 7,952
Posts |
__________________
|
Appreciate
0
|
09-04-2009, 12:32 PM | #22 |
Moderator
618
Rep 10,855
Posts |
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
Appreciate
0
|
Bookmarks |
|
|