What's this little sucker?

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Jan 30, 2006 | 12:23 PM

#41

tab545

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Joined: Aug 2004

Posts: 493

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From: Chicago

My Ride: #1: 2004 545i; 6-speed manual; Sport Package; Mystic Blue with a gray leather interior and Anthracite wood; CWP; Logic 7. #2: 2010 535xi Touring; Automatic.

Quote:

Originally Posted by Bart001' post='231923

The only sense in which wind chill matters to inanimate objects is that they will approach the true temperature more quickly. If a car is warm and parked at 0 degrees with no wind (like in a garage), it will not hit 0 degrees for quite a while, due to the buildup of layers of warm air immediately around the car; but if that warm car is parked at 0 degrees and a 50 mile per hour wind, it will approach 0 far more quickly.

That's not "wind chill," it's simply heat transfer. It may be relative to the rate of change of temperature, but it's not relative to absolute temperature.
[/quote]

Hmmmm. I guess I just think of it as: higher winds decrease the relative time it takes things to reach ambient temperature. Whether that's rate of heat transfer or wind chill, I'm not in a position to speak technically. Maybe wind chill takes into account the moisture of the skin, for example, whereas the other assumes dry conditions. No idea. I see I'm not using wind chill technically correctly then.

Jan 31, 2006 | 12:05 PM

#42

Rich535d

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Joined: May 2005

Posts: 113

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From: Leicester, UK

Exactly correct. 'Wind chill' will only relate to damp things (like us). Anyone familiar with wet and dry bulb hygrometers?

Just had another thought. Friction. If we can get enough speed, we should be able to hit 130C (270F) at around Mach 2 (but only because the probe is exposed)

Jan 31, 2006 | 12:47 PM

#43

kscarrol

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Joined: Mar 2004

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From: New Orleans, LA USA

My Ride: E90 M3

Model Year: 2011

Quote:

Originally Posted by miss525i' post='231773

Oh I jsut checked... I do have that little bugger!

Maybe its a accelerometer!!!!

did you find the little thingy? I couldn't find mine

[/quote]

Sorry to hear that miss525i!

Feb 12, 2008 | 10:57 AM

#44

sixcard

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Joined: Aug 2007

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From: Atlanta Burbs

My Ride: 08 550 Carbon Sport Almost everything factory, but no sound upgrades.

Suppose it is raining? Rapid evaporation would cool the thingy. That would be wind chill.

Feb 12, 2008 | 11:13 AM

#45

JeffNNJ

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Joined: Apr 2006

Posts: 1,102

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From: Northern NJ, USA

My Ride: 2011 M3 Convertible, Alpine White/black, 6 speed 2011 535xi Tasmin Green, Venetian Beige

Wow, I thought it was the car's weener

Feb 12, 2008 | 01:07 PM

#46

timewa

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Joined: Mar 2007

Posts: 258

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From: Enschede, Holland

Quote:

Originally Posted by w8pmc' post='231752' date='Jan 30 2006, 06:32 AM

I noticed this on my new car that i collect today & after asking the question the dealer said he thought it was an external temp sensor. Reason i asked is that it's over twice the size on my car than the photo you've posted & the other E60's that were parked close by, so my guess is that the 535D M-Sport needs a larger one, although for the life of me i can't work that out. I'd hoped ot was a radar jammer or something. They do look a little overkill for a temp sensor, but if that's what they are then fine.

That's obvious. The 535d has so much torque that they needed to make the little thingy twice as thick to prevent it from bending too much during acceleration.
It's called German design optimization.