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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Nov-21-2008, 05:53:07 PM   #11
silber
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This is why I always find it funny when I see track cars with CSL bumpers.
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Old Fri, Nov-21-2008, 06:50:57 PM   #12
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If this is the case, then why did BMW design the CSL that way? Not arguing a point one way or the other.
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Old Sat, Nov-22-2008, 07:18:59 AM   #13
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Quote:
Originally Posted by M3LTWIAN View Post
Are you serious or are you kidding me? Just about every BMW track/D.E junkie has aftermarket brake cooling ducts. The BMW ones are pretty much useless once you really start moving on the track. They serve a vital purpose to cool the rotors that could easily warp at the temperatures demanded of them after numerous 130mph stops (well over 1200 degrees) and these temperatures without the ducts literally bakes race pads if used constantly at those temperatures. If I did not have brake cooling ducts I would go through a set of Performance Friction race pads in a days time. The ducts cool the temperatures so the pads can work at optimum temperature, just like any other race cars ducts. If I didn't have them, the pads would work great but I would get no life what so ever out of them
the idea that heat causes warped rotors is an old myth. period. read this
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Old Sat, Nov-22-2008, 08:43:45 AM   #14
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Originally Posted by greenwc View Post
This is why I always find it funny when I see track cars with CSL bumpers.
So the M3 CSL being a track is funny to you? Am I missing something?
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Old Sat, Nov-22-2008, 09:12:26 AM   #15
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I'm sure he meant regular M3s with a CSL bumper. Thanks for all the replies. Interesting to know that since I opened up the air ducts leading to the brakes, this is actually diverting air away from the airbox bit of a catch 22 there.

From what I can gather, this is basically coming down to the rotors and pads that you are using at the track.

Still torn between splitters vs full bumper though.

Cheers,
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Old Sat, Nov-22-2008, 07:17:50 PM   #16
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Originally Posted by Got_S54? View Post
the idea that heat causes warped rotors is an old myth. period. read this
So it is according to them, which is interesting. But it doesn't display why you'd NOT want brake cooling ducts. If the pads get to hot then they don't work properly or "transfer pad material unevenly" because "hot spotting that occured at ELEVATED TEMPERATURES. Brake cooling ducts cool the rotor and the pad, so it can work at it's optimum temperatures and not hot spot.....
I know this because I have experienced overworked pads, first hand, many times on cars. They end up having a gushy dead feel, don't last long at all and sometimes make the car feel as if it's on "warped" rotors. Cool them down with ducts and they feel great and last much longer

In fact every case of "warped brake disc" that I have investigated, whether on a racing car or a street car, has turned out to be friction pad material transferred unevenly to the surface of the disc. This uneven deposition results in thickness variation (TV) or run-out due to hot spotting that occurred at elevated temperatures.
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Old Mon, Nov-24-2008, 09:33:42 PM   #17
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Quote:
Originally Posted by Syndicate View Post
I'm sure he meant regular M3s with a CSL bumper. Thanks for all the replies. Interesting to know that since I opened up the air ducts leading to the brakes, this is actually diverting air away from the airbox bit of a catch 22 there.

From what I can gather, this is basically coming down to the rotors and pads that you are using at the track.

Still torn between splitters vs full bumper though.

Cheers,
I know alot of people won't agree but... The airbox on our cars take air in through the top duck. The one above the radiator. The bottom duct, the one going to the bake duct, is there to help the air circulate through the box. The duct comming from the airbox is cut at an angle inside the brake duct. This creates a suction pulling air out. It keeps the air pressure even.
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Old Wed, Jan-21-2015, 09:49:51 PM   #18
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Default Re: CSL Front Bumper vs Stock :: Brake Cooling

Another thing to consider is the effect of the brake component heat on the brake fluid. If you boil the brake fluid, you're done. Like folks have said, this is all a system. You want optimum operating temps during your most common use case. If it's a fulltime track car, figuring out what that means based on your particular track/common ambient temp may be different than someone else's (One answer may not server everyone).

Looks to me that the CSL may have used intake from the center grill
http://www.e46fanatics.com/forum/sho...d.php?t=388851

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p.s. new to this forum, old time poster on bimmerforums, long time track of E36 M3's.
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Old Wed, Jan-21-2015, 09:55:28 PM   #19
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Default Re: CSL Front Bumper vs Stock :: Brake Cooling

Nice... 7 year bump lol
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Old Wed, Jan-21-2015, 10:40:56 PM   #20
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Default Re: CSL Front Bumper vs Stock :: Brake Cooling

no one really knows except the M engineers.
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Discussing CSL Front Bumper vs Stock :: Brake Cooling in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)