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Old 07-02-2009, 11:37 AM   #1
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BMW F10 M5 Spyshots



"Our spy photographers have once again managed to catch BMW's upcoming 2011 M5 sedan undergoing testing in Europe.

Although this particular mule is still heavily camouflaged, we can see several pieces of traditional M-trim including widened fenders, massive cross-drilled brake discs, and quad tailpipes.

The current M5's 500 bhp 5.0-liter V10 engine will be replaced by the new 555 hp twin-turbo 4.4-liter V8 from the recently introduced X5 M and X6 M. There is speculation that the V8 could be retuned to produce upwards of 600 hp in the M5, but that remains to be seen.

As we have previously reported, the 2011 M5 could adopt a kinetic energy recovery system (KERS) similar to what is used in Formula One racing. Designed to capture energy that would normally be wasted, the supposed system would deliver additional boost for added performance.

Another green technology that could appear on the M5 is a variable displacement system which would deactivate several of the engine's cylinders for improved fuel efficiency."





Source: http://www.worldcarfans.com/10907022...ow-new-details
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Old 07-02-2009, 11:54 AM   #2
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Man o man. Look at those brakes.
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Old 07-02-2009, 11:56 AM   #3
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Huge brakes!!
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Old 07-02-2009, 01:13 PM   #4
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I can't believe cars of this price range and performance pretentions still use floating calipers.
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Old 07-02-2009, 01:48 PM   #5
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I can't believe cars of this price range and performance pretentions still use floating calipers.
what do you mean?
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Old 07-02-2009, 02:02 PM   #6
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what do you mean?
List the possible meanings of what I said and I'll pick one.
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Old 07-02-2009, 02:29 PM   #7
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I can't believe cars of this price range and performance pretentions still use floating calipers.
1. floating calipers are too good for this price range
2. floating calipers aren't good enough for this price range.
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Old 07-02-2009, 02:35 PM   #8
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im guessing the new m5 will have 600 horsepower.
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Old 07-02-2009, 02:53 PM   #9
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does it come with the bullet-holes or are those optional upgardes?
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Old 07-02-2009, 03:00 PM   #10
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Quote:
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1. floating calipers are too good for this price range
2. floating calipers aren't good enough for this price range.
He's saying that they aren't good enough for this price range. I agree and disagree. For the average user the dual piston front and single piston rear floating calipers (the brakes on the current model M5) have more than sufficient braking capability. For the motorsport enthusiast however a fixed caliper / floating rotor set up is in check.
BMW does offer a 6 piston fixed caliper in their performance line up though


Just from the spy pics it looks like there might be a fixed caliper on the car because it looks like it might have a floating rotor.

edit: KERS... yes!

edit 2:

based on this pic they are 6 piston calipers so they are probably fixed
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Old 07-02-2009, 04:19 PM   #11
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Quote:
Originally Posted by Gamite View Post
1. floating calipers are too good for this price range
2. floating calipers aren't good enough for this price range.
2. floating calipers aren't good enough for this price range.
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Old 07-02-2009, 04:22 PM   #12
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Originally Posted by Dinan_M5 View Post
He's saying that they aren't good enough for this price range. I agree and disagree. For the average user the dual piston front and single piston rear floating calipers (the brakes on the current model M5) have more than sufficient braking capability. For the motorsport enthusiast however a fixed caliper / floating rotor set up is in check.
It's not just braking capability, but that's certainly part of it, although a single piston floater can easily provide more torque than a multipiston fixed. The only advantage floating calipers have is price. For a car that costs 100 grand, saving a thousand bucks on calipers is pathetic.
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Old 07-02-2009, 05:52 PM   #13
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although a single piston floater can easily provide more torque than a multipiston fixed.
If the area of the single big piston in the floating caliper is greater than the total area of the 6 pistons in the fixed caliper then yes. However I doubt that is true.
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Old 07-02-2009, 06:08 PM   #14
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Originally Posted by Dinan_M5 View Post
If the area of the single big piston in the floating caliper is greater than the total area of the 6 pistons in the fixed caliper then yes. However I doubt that is true.
If you think about the math behind circle area, it's actually not hard to achieve this. But increasing piston area will decrease your caliper pressure, so simply adding more pistons won't give you more braking power. However, having a wider, fixed caliper will increase your brake pad width (which, with the right compound, is what will get you more torque and much better fade resistance) and improve your brake pedal feel.
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Old 07-02-2009, 09:17 PM   #15
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how can you tell the difference? Please elaborate
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