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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #1  
Old 05-16-2016, 12:17 AM
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totitan totitan is offline
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Location: Thousand Oaks, CA
 
Join Date: May 2013
Posts: 280
Mein Auto: 2009 335d
568 miles Gallup NM to Parker, steady 92-100, 6400-5900 elevation 31 mpg

I spent the night in Galllup and arrived at my destination of Parker today. There were very few cars on the road so I decided to find out if the mpg in these cars drops much when driven at speed for long distances at speed. I mostly ran at 92-100 with a few bursts to 125 when passing. I was surprised to see 31.3 mpg. The previous day running from Thousand Oaks to Gallup I had to go a little slower, 80-90, and got 32.0.

I did notice a significant decrease of power especially when we were over 7000 ft around the Continental Divide.

Even after owning it for 3+ years this car never fails to amaze me.
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2009 335d
2016 VW GSW SE tsi
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2008 VW Rabbit
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  #2  
Old 05-16-2016, 05:41 AM
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bimmerdiesel bimmerdiesel is offline
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Location: Chicago
 
Join Date: Jul 2010
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Mein Auto: 335d
I usually drive 85-95 with few bursts to higher speed. I tend to get 31-33mpg. I miss when I used to get 35+ when driving in j 65-75 range.
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  #3  
Old 05-16-2016, 07:13 PM
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BB_cuda BB_cuda is offline
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Location: Clear Lake, Texas
 
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Posts: 893
Mein Auto: 2011 335D Msport
This car is a long distance and high speed cruiser.
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  #4  
Old 05-17-2016, 12:55 PM
335dwanted 335dwanted is offline
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Location: Northern NJ
 
Join Date: Aug 2014
Posts: 13
Mein Auto: 2009 335d
Quote:
Originally Posted by bimmerdiesel View Post
I usually drive 85-95 with few bursts to higher speed. I tend to get 31-33mpg. I miss when I used to get 35+ when driving in j 65-75 range.
uh... you could always slow down.
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  #5  
Old 05-17-2016, 01:54 PM
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Doug Huffman Doug Huffman is offline
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Location: Washington Island, Wisconsin, thru Death's Door
 
Join Date: Apr 2015
Posts: 2,258
Mein Auto: 2012 X5 35d (E70)
Quote:
Originally Posted by totitan View Post
[ ... ]I did notice a significant decrease of power especially when we were over 7000 ft around the Continental Divide. [ ... ]
Uh oh. Better have your turbos/control looked at.
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Post hoc ergo propter hoc is a weak logic akin to arguing from ignorance, "I don't know, but ..." Better to be silent and thought a fool than to babble and remove all doubt.
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  #6  
Old 05-17-2016, 06:22 PM
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totitan totitan is offline
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Location: Thousand Oaks, CA
 
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Mein Auto: 2009 335d
Quote:
Originally Posted by Doug Huffman View Post
Uh oh. Better have your turbos/control looked at.
It was still quicker than anything else at 7000'....just not the same as when its home in CA at its operating environment of 600' above sea level.

I did buy 10 acres in Kiowa CO this trip to build my retirement home on so I guess the d will have to get used to altitude...
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  #7  
Old 05-18-2016, 12:30 PM
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Flyingman Flyingman is offline
hang up and drive!
Location: Miami
 
Join Date: Sep 2009
Posts: 2,569
Mein Auto: 335d
Quote:
Originally Posted by totitan View Post
It was still quicker than anything else at 7000'....just not the same as when its home in CA at its operating environment of 600' above sea level.

I did buy 10 acres in Kiowa CO this trip to build my retirement home on so I guess the d will have to get used to altitude...
Some engines have a built in adjustment for altitude. No idea if ours do?

I know turbocharged diesels will hold their power rating far better than gas engines or naturally aspirated engines, and way better than a typical gas turbine at higher elevations (let's not introduce jet engines at 40,000 feet please Doug). In the end it is all about air mass flow.
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  #8  
Old 05-18-2016, 02:08 PM
F32Fleet F32Fleet is offline
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Location: SE United States
 
Join Date: Jul 2010
Posts: 1,813
Mein Auto: 435i, 335d sold.
Quote:
Originally Posted by totitan View Post
I spent the night in Galllup and arrived at my destination of Parker today. There were very few cars on the road so I decided to find out if the mpg in these cars drops much when driven at speed for long distances at speed. I mostly ran at 92-100 with a few bursts to 125 when passing. I was surprised to see 31.3 mpg. The previous day running from Thousand Oaks to Gallup I had to go a little slower, 80-90, and got 32.0.

I did notice a significant decrease of power especially when we were over 7000 ft around the Continental Divide.

Even after owning it for 3+ years this car never fails to amaze me.
It's amazing I know. I miss my diesel for that very reason (high speed with excellent fuel economy).
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  #9  
Old 05-18-2016, 04:35 PM
F32Fleet F32Fleet is offline
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Location: SE United States
 
Join Date: Jul 2010
Posts: 1,813
Mein Auto: 435i, 335d sold.
Quote:
Originally Posted by totitan View Post
It was still quicker than anything else at 7000'....just not the same as when its home in CA at its operating environment of 600' above sea level.

I did buy 10 acres in Kiowa CO this trip to build my retirement home on so I guess the d will have to get used to altitude...
Years ago I read a blurb that the ECU (DDE for diesels) could make adjustments up to approx. 4k feet.
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