View Single Post
      02-29-2012, 11:35 PM   #140
Nyulak
Captain
 
Nyulak's Avatar
 
Drives: 2009 BMW 535xi
Join Date: Feb 2007
Location: SheffVill, OH

Posts: 949
iTrader: (4)

Garage List
2009 BMW 535xi  [0.00]
Quote:
Originally Posted by KevinJ;


Also just review the C/D test notes: 2012 335i 0-60 5.3 and look at the outside cold temp which would helps the 0-60 time. The 335is for example was done at near 70-80 degree temps.

[url
http://media.caranddriver.com/files/2012-bmw-335i-sedan-test-review-car-and-driver2012-bmw-335i-april-2012.pdf[/url]

http://media.caranddriver.com/files/2011-bmw-335is.pdf
KevinJ, I think the cold weather of the C/D test may have reduced the grip from the tires. Also, the turbos are not maxed to allow for adjustments with respect to temperature, that is the hotter air would result in less power, but the extra headroom of the turbo is put to use by the DME to allow a consistent level of torque regardless of temperature - think of it as a temperature-dependent boost limiter that increases with temperature. This is why the car works better at higher altitudes than a comparable NA car; the DME can compensate for thinner air by allowing the turbos to spool more than it would at sea level. Of course, there is a limit to this adjustment.
Nyulak is offline   United_States
0
Reply With Quote