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LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23866
  
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Why does the TDV6 HSE have a higher CO2 output than other TDV6 models? I can only guess that It's due to the rear air-con, is that correct?
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 30th Oct 2006 1:38 pm |
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JakobVels
Member Since: 11 May 2006
Location: Copenhagen
Posts: 223
  
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Manual is standard on all TDV6 non-HSE
Auto is standard on TDV6 HSE
Combined CO2 emissions (g/km)...
Manual=244
Auto=270
Cheers
Jakob
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| 30th Oct 2006 1:54 pm |
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LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23866
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Didn't think of that, thanks. Although the HSE has auto. as a no cost option I thought.
I wonder if those figures are really true?
If I thrashed the engine all the time in a manual car, would I still produce less CO2 than driving smoothly in an automatic? If so why?
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| 30th Oct 2006 2:23 pm |
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Pelyma
Member Since: 06 Jan 2005
Location: Patching, Sussex
Posts: 15496
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As a know nothing, could it be the power lost through the torque converter? DS3 TDV6 HSE - Silver with Alpaca (old one) Gone
DS3 TDV6 HSE- Silver with Alpaca (new one) Gone
D4 HSE Lux - Montalcino Red Gone
Porsche Cayenne V8 Diesel S
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| 30th Oct 2006 2:57 pm |
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LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23866
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The torque converter would sap some power, I think. Still be interested to compare the CO2 output of a "thrashed" manual D3 with a smoothly driven auto. D3. I find it hard to believe that the auto. would produce more CO2 than a manual taken to the max. revs in each gear before changing up.
Perhaps I'm missing something obvious though.
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| 30th Oct 2006 3:09 pm |
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Ocsid
Member Since: 29 Nov 2005
Location: Hampshire
Posts: 255
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Just as the fuel consumption ratings relate to very specific and controlled schedules so does the CO2 rating.
The more fuel you burn the more CO2 you make, unless its part burnt. Its why petrol vehicles like for like are more CO2 polluting than diesels.
Thats also why the Autos are environmentally worse than manauls on the test, they simply burn more fuel to overcome basically the torque converter's rpm slippage and the extra weight in the case of HSEs.
Once we have got hold of it we could thrash it and get far more pollution just as we can influence the fuel consumption, or we could try to drive conscientiously.
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| 30th Oct 2006 5:33 pm |
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LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23866
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Anyone actually know what the CO2 output test conditions are?
We all know that the official mpg figures are not very realistic in the real world. Just wondering if the quoted CO2 figures are really less or more under normal driving conditions.
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| 31st Oct 2006 12:13 pm |
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zig
Member Since: 09 Sep 2005
Location: Scotland
Posts: 650
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The CO2 figures are obtained from the VCA Combined Fuel Consumption figures.
For a 06 MY diesel automatic Discovery the metric combined fuel consumption is stated as 10.4 litres/100km or 0.104 litres/km.
If you multiply the 0.104 litres/km by the conversion factor of 2.68 (National Energy Foundation figure) you get 0.279 kg/km or 279 g/km (the VCA must use a slightly different conversion as there quote a figure of 275 g/km).
In otherwords every litre of diesel used results in 2.68kg of CO2.
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| 31st Oct 2006 10:06 pm |
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catweasel
Member Since: 05 May 2006
Location: Bundaleer
Posts: 4805
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so if diesel weighs 1kg/l (more like .85kg/l) is put into an engine and is burnt with some of it's loss as light, some as noise and some as energy to force the piston down with the remainder being exhausted, this exhaust gas then goes to a take away and gains weight and for that same litre emits 2.68kg of CO2. please elaborate on it's weight gain, I can't see it.
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| 1st Nov 2006 12:17 pm |
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JMC
Member Since: 25 Feb 2006
Location: Aberdeen-Angus. Where the Bull* comes from!
Posts: 6417
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catweasel wrote:please elaborate on it's weight gain, I can't see it.
I thought abnout this for some time CW, and I was of the same initial feeling as you. However, when you look, the answer is staring you in the face. 
CO2...... The 'C' comes from the diesel fuel, but the 'O' comes from the combustion with Oxygen in the air.
An analogy would be to say that 100ml of diluting orange juice makes a litre of orange squash, then ask how you can get 1000ml from 100ml to start with. Get it 
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| 1st Nov 2006 12:30 pm |
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