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      12-20-2018, 10:57 PM   #23
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Quote:
Originally Posted by Anthony1s View Post
https://f87.bimmerpost.com/forums/sh....php?t=1497066

Standard M2/M2C brakes (blue) (source: see here):
  • blue front caliper - 4.890 kg or 10.78 lbs
  • blue rear Caliper - 3.600 kg or 7.94 lbs
  • 380x30mm front rotor - 11.300 kg or 24.91 lbs
  • 370x24mm rear rotor - 9.300 kg or 20.50 lbs
    = 58.180 kg or 128.26 lbs
2NH M Sport Brakes (silver) - M Performance Parts Brakes (red):
  • silver/red front caliper - 7.540 kg or 16.62 lbs
  • silver/red rear Caliper - 4.310 kg or 9.50 lbs
  • 400x36mm front rotor - 13.870 kg or 30.58
  • 380x30mm rear rotor - 11.300 kg or 24.91
    = 74.040 kg or 163.23 lbs

14.8lbs heavier calipers
20.16lbs heavier rotors
Ok I stand corrected, holy those are some heavy rotors. Maybe it's the hats, because another 20mm up front can't possibly be the sole cause of 2kg increase. Like this is significant weight.

Otherwise, the weight wasn't as bad as I thought seeing most of it can be removed without too much issue. (Seats can be replaced with fixed back buckets, and exhaust will probably be swapped out by most).
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      12-21-2018, 01:31 AM   #24
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Another thing is larger brakes, M sport seats, and 788M wheels aren't standard in many markets (unlike the US market). In other words, if you spec your M2C with blue brakes, 437M wheels, and regular seats let's say in Germany, the weight difference between M2 and M2C won't be anywhere near what's quoted in the article.
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      12-21-2018, 02:15 AM   #25
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Quote:
Originally Posted by cntzl View Post
Another thing is larger brakes, M sport seats, and 788M wheels aren't standard in many markets (unlike the US market). In other words, if you spec your M2C with blue brakes, 437M wheels, and regular seats let's say in Germany, the weight difference between M2 and M2C won't be anywhere near what's quoted in the article.
+1
Which is a great thing. Only issue is our lack of an option sheet.
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      12-21-2018, 05:19 AM   #26
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Quote:
Originally Posted by F87source View Post
It's the calipers not the disk, the calipers don't rotate, so no additional rotational intertia added, just unsprung weight.
but heavier wheels do add rotating inertia
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      12-21-2018, 08:11 AM   #27
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Quote:
Originally Posted by GoneIn4Secs View Post
but heavier wheels do add rotating inertia
I would argue that if your intent is tracking and or autocross the lower you can get unstrung weight the easier the car is to rotate . That would not only include lighter wheels AND tires but lighter brakes. I do wish the M4 ceramic brakes were offered on the M2. For street use a non issue
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      12-21-2018, 10:27 AM   #28
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      12-21-2018, 11:18 AM   #29
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Quote:
Originally Posted by F87source View Post
Ok I stand corrected, holy those are some heavy rotors. Maybe it's the hats, because another 20mm up front can't possibly be the sole cause of 2kg increase. Like this is significant weight.

Otherwise, the weight wasn't as bad as I thought seeing most of it can be removed without too much issue. (Seats can be replaced with fixed back buckets, and exhaust will probably be swapped out by most).
They are 6mm thicker too.

Fronts 26.3% larger
Rears 28.3% larger

The math I did to get that is:
380x30 = 11,400
400x36 = 14,400
26.3% difference

370x24 = 8,880
380x30 = 11,400
28.3% difference

..........

If we look at the weights, they are lighter than expected in relation to the increased size.
Fronts are only 22.8% heaver
Rears are only 21.5% heaver
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      12-21-2018, 01:10 PM   #30
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They are vented though, so not all of that extra thickness is iron.
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      12-21-2018, 01:46 PM   #31
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Quote:
Originally Posted by M Fifty View Post
They are vented though, so not all of that extra thickness is iron.
Weight gain is pretty high for such a small size increase imo.
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      12-21-2018, 04:14 PM   #32
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Quote:
Originally Posted by M Fifty View Post
They are vented though, so not all of that extra thickness is iron.
Ah, yea, didn't think about that. Both are vented though, so shouldn't it be proportional? I'm not sure... too much for me to think about right now.
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      12-21-2018, 04:26 PM   #33
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Quote:
Originally Posted by Anthony1s View Post
Ah, yea, didn't think about that. Both are vented though, so shouldn't it be proportional? I'm not sure... too much for me to think about right now.
Yeah that's what I was thinking too, the internals are vented so I was thinking 20mm no way it should be 2kg more, and since the calipers are nearly solid it would make sense that's where the weight came from. But if that's not the case then well that's pretty crazy. Maybe it's a different composition of metal? The rotors on the og m2 are really soft and over heat and wear way too quick.
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      12-22-2018, 02:00 PM   #34
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Quote:
Originally Posted by Anthony1s View Post
https://f87.bimmerpost.com/forums/sh....php?t=1497066

Standard M2/M2C brakes (blue) (source: see here):
  • blue front caliper - 4.890 kg or 10.78 lbs
  • blue rear Caliper - 3.600 kg or 7.94 lbs
  • 380x30mm front rotor - 11.300 kg or 24.91 lbs
  • 370x24mm rear rotor - 9.300 kg or 20.50 lbs
    = 58.180 kg or 128.26 lbs
2NH M Sport Brakes (silver) - M Performance Parts Brakes (red):
  • silver/red front caliper - 7.540 kg or 16.62 lbs
  • silver/red rear Caliper - 4.310 kg or 9.50 lbs
  • 400x36mm front rotor - 13.870 kg or 30.58
  • 380x30mm rear rotor - 11.300 kg or 24.91
    = 74.040 kg or 163.23 lbs

14.8lbs heavier calipers
20.16lbs heavier rotors
Too add to this, here are the carbon ceramic weights. The upgrade kit to do this costs around $11.5k (part #34112358378) and you'll recoupe some of that if your sell your stock brakes. Not sure how much you'll recoupe, haven't looked into it. Also is a TON cheaper than the $30k for the Brembo CCB's IND has for sale and those are 380mm and 360mm rotors. So not sure why anyone would chose those over the BMW CCB's.

Carbon Ceramics:
  • Gold Front caliper - 7.540 kg or 16.62 lbs
  • Gold Rear Caliper - 4.310 kg or 9.50 lbs
  • 400x38mm Front Rotor - 7.33 kg or 16.15 lbs
  • 380x28mm Rear Rotor - 5.72 kg or 12.61 lbs
    = 49.786 kg or 109.76 lbs
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      12-22-2018, 03:42 PM   #35
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Quote:
Originally Posted by Anthony1s View Post
Too add to this, here are the carbon ceramic weights. The upgrade kit to do this costs around $11.5k (part #34112358378) and you'll recoupe some of that if your sell your stock brakes. Not sure how much you'll recoupe, haven't looked into it. Also is a TON cheaper than the $30k for the Brembo CCB's IND has for sale and those are 380mm and 360mm rotors. So not sure why anyone would chose those over the BMW CCB's.

Carbon Ceramics:
  • Gold Front caliper - 7.540 kg or 16.62 lbs
  • Gold Rear Caliper - 4.310 kg or 9.50 lbs
  • 400x38mm Front Rotor - 7.33 kg or 16.15 lbs
  • 380x28mm Rear Rotor - 5.72 kg or 12.61 lbs
    = 49.786 kg or 109.76 lbs
I would do the AP racing kit, way better performance on the track and you don't have to worry about rotor replacement cost.
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      12-24-2018, 09:54 AM   #36
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wheels

Quote:
Originally Posted by CosmosMpower View Post
What about the boat anchor wheels
yeah, what about the wheels? as I understood it the 437's are 4lbs less (each) than the 788's. how come that didn't make their muscle chart?
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      12-24-2018, 08:13 PM   #37
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Quote:
Originally Posted by JRF View Post
Quote:
Originally Posted by CosmosMpower View Post
What about the boat anchor wheels
yeah, what about the wheels? as I understood it the 437's are 4lbs less (each) than the 788's. how come that didn't make their muscle chart?
Maybe because in some markets you get a choice of wheels?
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      12-24-2018, 09:14 PM   #38
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Quote:
Originally Posted by akkando View Post
Maybe because in some markets you get a choice of wheels?
+1
I believe 437m is still available in other markets.
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      01-07-2019, 05:50 PM   #39
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Great thread. Thanks for the intel!
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      01-07-2019, 06:04 PM   #40
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Quote:
Originally Posted by Anthony1s View Post
They are 6mm thicker too.

Fronts 26.3% larger
Rears 28.3% larger

The math I did to get that is:
380x30 = 11,400
400x36 = 14,400
26.3% difference

370x24 = 8,880
380x30 = 11,400
28.3% difference

..........

If we look at the weights, they are lighter than expected in relation to the increased size.
Fronts are only 22.8% heaver
Rears are only 21.5% heaver
Remember when calculating the size of a 3d disk (Cylinder) you need to use pi multiplied by the radius squared, times the height. not just multiply the diameter and height.

Volume = 3.14~ * r^2 * H

OGm2 Front disk volume (assuming these are actually just cylinders) : V≈3.410^6

2NH Front disk volume : V≈4.5210^6

difference in volume of the hypothetical disks is 32%

This is just for fun, the above numbers are pretty pointless since we dont know:

Alloy used in both disks
Hat dimensions of both disks
Vane design/count of both disks
Space cut for airflow in both disks (drilled holes, and the dimensions of the vanes for airflow in the center of the disk)
etc...
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      01-07-2019, 06:14 PM   #41
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Quote:
Originally Posted by as7920 View Post
^Now that's a proper looking exhaust.

Makes the OG M2 exhaust look like it's been taken from an M135i. Apart from 4 tips, almost identical.
Well, yeah... they share the same drivetrain.
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      01-07-2019, 06:24 PM   #42
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IMO the OG M2 is the M2 to have If someone is getting an M2. The M2C doesn't add anything to the equation that's needed, in my eyes...
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      01-07-2019, 06:52 PM   #43
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Perhaps they intentionally added the weight, so they can create the M2 CSL and claim a few hundred pound weight savings.
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      01-07-2019, 07:15 PM   #44
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Quote:
Originally Posted by tranck View Post
What jumps out at me are the 2 biggest weight gains - both of which I don't want or need. - especially the exhaust.
LOL but how would they sell you an M2 CSL if they put the Light weight exhaust on the Competition.
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