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      09-04-2014, 03:46 PM   #23
3.0L
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Quote:
Originally Posted by bman6074 View Post
Also wouldn't air density and elevation change things a bit. This could be why they report different 0-60 times.
Yes, it very well could. The term is called "Density Altitude" in the aviation world has a very big effect on aircraft performance.

High altitudes combined with hot air temperatures results in much thinner air. Normally aspirated (no turbo) engines really suffer under those conditions. Typically, a normally aspirated engine can only achieve about 75% of its sea level rated HP at an altitude of 8000 feet or so. And that's on a so-called standard day. A "standard" day is described as 59 degrees temperature at sea level and the barometric pressure is 29.92 inches of mercury. In other words, non-standard days are the norm.

In the case of our turbocharged cars, a big part of the equation is how much reserve do our turbos have (if any) to maintain sea level HP at higher altitudes and/or higher than normal air temperatures.
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      09-04-2014, 04:31 PM   #24
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Different outfits use different methodologies for acceleration testing.

For example, C&D normalizes their results to account for differing weather conditions during testing.
http://www.caranddriver.com/features...braking-page-2

C&D, MT, R&T use rollout, Automobile and Edmunds do not:
http://forums.anandtech.com/showthread.php?t=2009715

Due to these differences, one should only compare 0-60 times with others from the same magazine, group, site, etc.
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      09-04-2014, 04:49 PM   #25
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Quote:
Originally Posted by plien69 View Post
Different outfits use different methodologies for acceleration testing.

For example, C&D normalizes their results to account for differing weather conditions during testing.
http://www.caranddriver.com/features...braking-page-2

C&D, MT, R&T use rollout, Automobile and Edmunds do not:
http://forums.anandtech.com/showthread.php?t=2009715

Due to these differences, one should only compare 0-60 times with others from the same magazine, group, site, etc.
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      09-04-2014, 06:02 PM   #26
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Quote:
Originally Posted by 3.0L
Quote:
Originally Posted by Researcher View Post
Note that in the 2014 Model BMW quotes 0-60 of 4.8 on the AT M235i.
For 2015 they are quoting 4.6.

I assume this is just a revised literature to reflect actual numbers and no changes were made to the vehicles themselves.
From the many road tests I've read, the BMW factory numbers appear to be a bit conservative. Car & Driver and others have been observing consistent 0 to 60 times in the 4.3 to 4.5 second range (automatic version).

Also, from my experience, the car slightly exceeds the EPA MPG ratings, especially on the highway.
Wow. 4.3?
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      09-04-2014, 06:52 PM   #27
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Quote:
Originally Posted by ewohar View Post
Wow. 4.3?
So they (the car mags) say. Your mileage may vary.

Maybe one of these (cool) days I'll take my car out on some level, desolate road and do my own 0 to 60 testing. Just for grins.
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      09-04-2014, 08:59 PM   #28
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Quote:
Originally Posted by Researcher View Post
Note that in the 2014 Model BMW quotes 0-60 of 4.8 on the AT M235i.
For 2015 they are quoting 4.6.

I assume this is just a revised literature to reflect actual numbers and no changes were made to the vehicles themselves.
Maybe I'm just naive, but before I decided between RWD and xDrive, I read that there's a claimed 4.6s for the m235xi while a claimed 4.8s for the m235i. This seems like it would explain the quoted numbers changing when the xDrive variant was introduced for 2015.
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      09-04-2014, 09:31 PM   #29
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Quote:
Originally Posted by 3.0L View Post
Yes, it very well could. The term is called "Density Altitude" in the aviation world has a very big effect on aircraft performance.

High altitudes combined with hot air temperatures results in much thinner air. Normally aspirated (no turbo) engines really suffer under those conditions. Typically, a normally aspirated engine can only achieve about 75% of its sea level rated HP at an altitude of 8000 feet or so. And that's on a so-called standard day. A "standard" day is described as 59 degrees temperature at sea level and the barometric pressure is 29.92 inches of mercury. In other words, non-standard days are the norm.

In the case of our turbocharged cars, a big part of the equation is how much reserve do our turbos have (if any) to maintain sea level HP at higher altitudes and/or higher than normal air temperatures.
You are correct sir, good post
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