Diesel Consumption in Winter
11-24-2006, 01:09 PM
#13
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Well for shorter trips our consumption goes up during the winter, due to the cold starts.. We use a electric engine heater, so the engine is pre-heatet before startup. It helps the engine getting warm in a shorter period compared to when I can't preheat it !
On longer trips our consumption is even lower than during the summer, due to colder weather (turbo likes that!) and our winter tires are not as wide as our summertires.
+10 degress ? here now, in the end of November, so we are still on summertires! Amazing!
On longer trips our consumption is even lower than during the summer, due to colder weather (turbo likes that!) and our winter tires are not as wide as our summertires.
+10 degress ? here now, in the end of November, so we are still on summertires! Amazing!
11-26-2006, 07:00 AM
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My Ride: -04 530D
Originally Posted by KAF' post='360126' date='Nov 24 2006, 07:00 PM
My 530D gives 31.6 in summer 29.7 in winter.
Reasons,
4. And...I think.....Colder fuel means the 'calorific value' is reduced, for a given amount of fuel by volume you get less energy out. So you have to use more for the same power. (I'm sure Znod or one of the other technical experts will put me right here!)
Reasons,
4. And...I think.....Colder fuel means the 'calorific value' is reduced, for a given amount of fuel by volume you get less energy out. So you have to use more for the same power. (I'm sure Znod or one of the other technical experts will put me right here!)
Biggest consumer, specially in direct injection diesels, is heating. Did You know that in BMW diesels radiator actually heat cooling liquid? Yep, there is electrical resistors which help engine to heat up quicker. Maybe second biggest is bearing rolling resistance which is higher at cold weather. If You use winter tyres their rolling resistance is also higher. We who have Webasto intepended heater can see up to 0,7 L/100km higher consumption.
That air density is quite far... But I got the hint!
Or did I?? 
Skaffa
11-27-2006, 08:38 AM
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My Ride: 2001 BMW 316ti, 2004 BMW 530d, 2006 BMW 530xd, 2013 BMW 320d touring, 2014 BMW 520d touring, 2016 BMW X5, 2020 BMW 320da touring, 2020 BMW 540i
Model Year: 1974
Engine: Flat six
i can get around 7,5 liter/ 100 km/h in regular drive or around 8,5/9 liters at extreme driving... last week drove around 300 km always at + 200 km/h.... 8,9 liter/ 100 km.
Drove 80 kms side by side with a 535d touring around 230/250 km/h.
Drove 80 kms side by side with a 535d touring around 230/250 km/h.
11-27-2006, 08:52 AM
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My Ride: My ex-ride: EU '08 LCI 520dA. Space Grey, Sport Seats in Black Leather/Fabric Anthracite, Sport Steering Wheel, A/C with Extended Features, Hi-Fi Speakers, Cup Holders, Cruise with Braking function, Folding Rear Seats, Xenons, Park Distance Control.
Originally Posted by Tuga' post='361102' date='Nov 27 2006, 07:38 PM
i can get around 7,5 liter/ 100 km/h in regular drive or around 8,5/9 liters at extreme driving... last week drove around 300 km always at + 200 km/h.... 8,9 liter/ 100 km.
Drove 80 kms side by side with a 535d touring around 230/250 km/h.
Drove 80 kms side by side with a 535d touring around 230/250 km/h.
Have you ever seen or felt cold?
11-27-2006, 09:15 AM
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My Ride: E61 535d Apr 05. UK spec + Media Pack, Luxury Pack & Visibility Pack
Originally Posted by Ricracing' post='361111' date='Nov 27 2006, 05:52 PM
Have you ever seen or felt cold?
11-27-2006, 09:49 AM
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Originally Posted by Tuga' post='361102' date='Nov 27 2006, 06:38 PM
i can get around 7,5 liter/ 100 km/h in regular drive or around 8,5/9 liters at extreme driving... last week drove around 300 km always at + 200 km/h.... 8,9 liter/ 100 km.
Drove 80 kms side by side with a 535d touring around 230/250 km/h.
Drove 80 kms side by side with a 535d touring around 230/250 km/h.
Tuga's car has just been broken in, that's why it runs so nice!
+130.000 kms right ?
11-28-2006, 09:17 AM
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My Ride: E60 530dA 3/2004
I'm a bit surprised that no one has mentioned gearbox and differential?
I remember several years back when I started my E34 and went straight away to higway: The car was with manual and naturally the stick was very tough at a beginning (- 26 C). More surprised I was ,when I noticed that the stick remain a bit tough all thru the journey (apr 150 km)! So the air cooled the gearbox allmost equal the rolling warmed it.
I wonder how much there was additional friction for engine to work on.
Can't remember what was the fuel consumption. Pretty high, I guess.
Back to today: I haven't notice any difference in mileage in my 530dA comparing mid autumn to early winter drives.
I remember several years back when I started my E34 and went straight away to higway: The car was with manual and naturally the stick was very tough at a beginning (- 26 C). More surprised I was ,when I noticed that the stick remain a bit tough all thru the journey (apr 150 km)! So the air cooled the gearbox allmost equal the rolling warmed it.
I wonder how much there was additional friction for engine to work on.
Can't remember what was the fuel consumption. Pretty high, I guess.
Back to today: I haven't notice any difference in mileage in my 530dA comparing mid autumn to early winter drives.
12-06-2006, 09:29 AM
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My Ride: 520d SE Manual, Sports Suspension, Sports Steering Wheel, Dakota Leather.
Originally Posted by steve_gus' post='360194' date='Nov 24 2006, 08:59 PM
the more power with cold air' is always an interesting one. Although its true, does anyone ever drive thier car on a cold day and think hey, this is faster today - dont think so - the effect must be pretty marginal.
the example I gave on my car was for a full 50 mile journey, each way, each day, over 2 years, so im pretty sure its not just the first few miles of warm up.... not over a 50 mile journey.
If the air charge is more dense, then there needs to be a proportionately bigger amount of fuel added ..... this makes sense no?
On the other hand, it might just be crappy engine mapping, overfuelling a bit to help with what would otherwise be a lumpy engine response.
In less than a week i will abe able to see how a 520d compares, as least in the cold
cheers
steve
the example I gave on my car was for a full 50 mile journey, each way, each day, over 2 years, so im pretty sure its not just the first few miles of warm up.... not over a 50 mile journey.
If the air charge is more dense, then there needs to be a proportionately bigger amount of fuel added ..... this makes sense no?
On the other hand, it might just be crappy engine mapping, overfuelling a bit to help with what would otherwise be a lumpy engine response.
In less than a week i will abe able to see how a 520d compares, as least in the cold
cheers
steve