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02-27-2008, 04:04 PM | #1 |
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M3 upgrade: 135i brakes
The M3 brakes actually have more stopping power (duh) but thought this was still funny. People are talking about upgrading the M3 brakes to 135i brakes because they have 3 pistons:
http://www.bimmerfest.com/forums/sho....php?p=3039154 |
02-28-2008, 08:46 AM | #2 |
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There's no reason for the M3 not to have proper brakes - take a look at the Brembos on the GTR sometime. They make the 135i's Brembos look like toys...
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02-28-2008, 03:26 PM | #4 | |
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For all we know, the BMW single pots deliver more brake torque than the 6-pots, all its all piston area, no number thereof. |
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02-28-2008, 03:43 PM | #5 | |
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02-28-2008, 03:49 PM | #6 | |
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weird that it is not clear that the marquee car that is the M3 has better brakes than the 1 series of all things. In any event, ours look better and thats half the battle.... |
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02-28-2008, 04:38 PM | #7 | |
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The M3's rotors are not big enough to sink all the heat that can be generated by such a fast & heavy car. If you examine the GTR's brakes, you'll find that they have much more advanced Brembo multi-piston calipers, but they also have much bigger and more advanced rotors. They are 2-piece with an aluminum hat and separate huge floating iron rotor that dwarfs the M3's....
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02-28-2008, 05:01 PM | #8 |
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Is it me or did BMW drop the ball on the new M3? It is a land yacht with a decent engine, OK brakes, and pretty good handling. It's not the amazing car the old 3s were. Maybe they've lost their touch and the era of the M3 is over.
Any hillbilly in a used corvette will smoke a new M3 around town. Sad state of affairs. |
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02-28-2008, 05:02 PM | #9 |
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02-28-2008, 05:24 PM | #10 |
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Duh. I feel like a retard now
I've never used this before, let alone on myself I apologize...long day at work...
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02-28-2008, 07:40 PM | #11 | |
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Did you look into the respective rotor thickness? The 135's brakes aren't really all that hot when you look at how thin the rotors are... |
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02-28-2008, 11:18 PM | #12 | |
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Unfortunately, adding thicker (or larger diameter) rotors means replacing those fancy Brembo calipers.
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02-29-2008, 09:59 AM | #13 |
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Better pads, fluid and stainless brake lines should alleviate all of the above mentioned problems with the 135's brakes. I'm sure a few easy changes to the 135's brakes will make a world of difference. Nate
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02-29-2008, 10:06 AM | #14 |
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This is a common refrain. I personally don't believe it, but I'll be happy if proved wrong. I think your suggestions will be fine for aggressive street driving and even light track use, but hitting it hard on a track with track tires on a warm day (and a track which is demanding on brakes) will likely reveal the inadequacies of the rotors, imho...
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02-29-2008, 12:53 PM | #15 |
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^^ I think you'll find that the combination of factors your listed would most likely kill the everyday cars break setup, Even a few that are considered track happy would suffer on such a demanding circuit.. etc etc..
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02-29-2008, 02:17 PM | #16 | |
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Most Porsches are and the GTR seems to be, but there are many more that are not...
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02-29-2008, 02:29 PM | #17 |
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Firstly, and this has been said before, I don't think anyone doubts that the M3 has better brakes than the 135, certainly in general and probably even when the extra weight of the car is taken into consideration.
The point of my original post is that to me, I expected the M3 to blow the 135 out of the water, and in reality you get an incremental performance boost (or where I live, no performance boost) for the extra cash. Also, the sentiment on the M3 boards is the same - they considered the fact that the 135 had better performance in some areas... I've heard that replacing the brake pads makes a huge difference as street pads are designed not to squeal, which limits the compounds that can be used. I'm sure there are other factors and maybe someone who is more knowledgeable can comment on this.Several of the reviewers used track brakes. I have no idea how thick the rotors are... |
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02-29-2008, 02:37 PM | #18 |
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Sure, we can go with that:biggrin:
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02-29-2008, 07:53 PM | #19 |
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Looking at the design of the underbody tray in the photos, as well as the front air intakes in lieu of foglights, and it may well be that BMW has designed adequate cooling ducts for the brakes. The only difference between a thick vented rotor and a thin one is the volume of air that moves through it. cooling ducts if they work right can move a lot more cool air across a hot disk than another 15cm cubed volume of air sucked through the vanes...
I'll reserve judgement until I've run through a few sets of Pagids.
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02-29-2008, 10:41 PM | #20 |
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This is very mistaken. The mass of the iron rotor is critical in determining the amount of heat that can be dissipated.
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03-01-2008, 12:24 AM | #22 |
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