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Thread: *shocker* VW TDI Wins Green Car of the Year

  1. #1
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    *shocker* VW TDI Wins Green Car of the Year

    Green Car Journal has named the Jetta TDI as Green Car of the Year
    http://www.msnbc.msn.com/id/27825003/


    I think this is a nice step in the direction of the acceptance of diesels in the NA market.

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    Nice to see we're making progress.

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    About time a diesel car gets labelled as green

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    Are diesel's actually better for the environment though?

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    Quote Originally Posted by Kitdy View Post
    Are diesel's actually better for the environment though?
    Depends. Some emissions are better, some worse. They do generally get better mileage, especially in bigger vehicles. The real tradeoff comes in cost vs mileage, but that's not environmental. I'm just worried they'll become the next hybrid and the smug levels will start rising again.

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    Quote Originally Posted by wwgkd View Post
    Depends. Some emissions are better, some worse. They do generally get better mileage, especially in bigger vehicles. The real tradeoff comes in cost vs mileage, but that's not environmental. I'm just worried they'll become the next hybrid and the smug levels will start rising again.
    I wonder about emission per kilometre.

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    Quote Originally Posted by Kitdy View Post
    I wonder about emission per kilometre.
    They're better than anything with a petrol engine.
    Especially with particulate filters.

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    Quote Originally Posted by Zytek_Fan View Post
    They're better than anything with a petrol engine.
    Especially with particulate filters.
    Not in terms of NOx, and with the same fuel consumption petrol engines produce less CO2s per kilometre than diesels IIRC.
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    Quote Originally Posted by Ferrer View Post
    Not in terms of NOx, and with the same fuel consumption petrol engines produce less CO2s per kilometre than diesels IIRC.
    absolutely. I would say that a diesel produces more CO2 in first place, but it can be lowered, producing more NOx though, but I would need to check some of my books.

    and the particulate filter is preventing the performance to raise as in the past between each new model. it can be basically seen as a sort of plug in the exhaust, since it works better when it is almost filled with entrapped particulate, but lowering (a lot) the pressure in the exhaust, and as we now all diesel works with a turbocharging system, which in turn works with pressure.
    Last edited by LeonOfTheDead; 11-28-2008 at 06:18 AM.
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    Overall though, are the higher nitrous oxide emissions enough to offset the lower carbon dioxide emissions?

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    So?

    Motortrend's Car of the Year is the GT-R.

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    Quote Originally Posted by Kitdy View Post
    Overall though, are the higher nitrous oxide emissions enough to offset the lower carbon dioxide emissions?
    CO2 is the result of the combustion, something you can't get rid completely, and it's quite natural too, even if in big quantities is not a good thing for the environment. NOx are toxics, and much more difficult to reduce.

    finally, gas exhausted by a diesel stink, if compared to those of a petrol.
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    Quote Originally Posted by LeonOfTheDead View Post
    and the particulate filter is preventing the performance to raise as in the past between each new model.
    some random cars with a particulate filter: Peugeot 908, Audi R10, very poor on performance indeed....
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    Quote Originally Posted by henk4 View Post
    some random cars with a particulate filter: Peugeot 908, Audi R10, very poor on performance indeed....
    you should wonder what they could make without it though

    considering LMP/GT engines usually run with air restrictors and so on, it shouldn't have been a big deal for them to install the filter (and I could even argue if those filters really work or work as those we both have on our cars)
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    Quote Originally Posted by LeonOfTheDead View Post
    you should wonder what they could make without it though
    all BMW, Mercedes and Audi diesels now come with a filter. no performance problems there I would say. If you are already using exhaust turbo charging, which all modern diesels do, then the need for a free flowing exhaust system becomes less urgent than when using an atmospheric engine...
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