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Diesels in the News

8143 messages,  Last post on Nov 27, 2009 at 12:10 PM

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What is this discussion about? Diesel


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#7214 of 8143
Re: Porsche Diesel [alltorque] by ruking1
Nov 24, 2008 (8:27 am)
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Replying to: alltorque (Nov 24, 2008 7:39 am)

For us that use the 128 oz gal, 84 imp=
 
69.94 mpg
#7215 of 8143
Re: Porsche Diesel [ruking1] by alltorque
Nov 24, 2008 (9:20 am)
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Replying to: ruking1 (Nov 24, 2008 8:27 am)

Still sounds pretty good. A quick n'dirty calc would suggest the Jag was running at around 45mpg US. Believe it's an 80 litre tank.
 
No wonder they were all astounded.
#7216 of 8143
Re: Porsche Diesel [alltorque] by ruking1
Nov 24, 2008 (9:26 am)
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Replying to: alltorque (Nov 24, 2008 9:20 am)

45 mpg!!! WAY cool. Again the US car industry is the repository for gas guzzlers. So as an example, I have a close Aunt/Uncle whose (late model) Jag gets 12-15 mpg and they say they are lucky to get THAT !!!!! 45 miles per gal the twin turbo diesel gets 3 times to 3.75 x better mileage !!!!!! This might be a good reason why our K-12 school system pooh poohs mathematics? Our "leaders" still don't get it. But they still generate a lot of hot air about it.
#7217 of 8143
Re: Porsche Diesel [alltorque] by jlbl
Nov 24, 2008 (12:07 pm)
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Replying to: alltorque (Nov 24, 2008 7:39 am)

Gagrice, the pleasure is mine and, I presume, Jose's. Just highlights that something ain't right in your car industry.
 
Sure it's my pleasure too.
 
There are so many good diesel cars over here… practically the full range of asians, europeans, and the USA big three brands offer diesels, from the biggest to the smallest models.
 
I'm not a diesel apostle. In my life I´ve driven gassers and diesels and enjoyed both. My conclusion is: driving a diesel through torque is at least as fun as it can be driving a gasser to the redline but more fuel efficient.
 
That said, I must say that by no means I'm a hypermiler. I like to drive agile. I enjoyed my last 530d and I enjoy even more my current 335d. I much liked a 118d I drove extensively last winter; she was an excellent blend of performance and economy.
 
My point is that opting between gassers and clean diesels is a good choice which can be made almost everywhere. Why not in the USA? Let the buyers decide. (Please do not forget legislation also is environment ally conservative over here.)
 
Regards,
Jose
#7218 of 8143
Re: Porsche Diesel [jlbl] by houdini1
Nov 24, 2008 (7:10 pm)
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Replying to: jlbl (Nov 24, 2008 12:07 pm)

Jose, how are you doing? Glad to see you posting in the diesel forum. For sure, we get very few diesels over here to the tune that it is almost criminal. Our gov. preaches fuel and oil conservation but makes laws to promote just the opposite. Ridiculous.
 
I hope you are doing well and enjoying your 335d. I just bought a 2006 LS 430 and believe it or not, after about 1,000 miles, according to the computer (and me verifying at fill ups), I am averaging about 23.5 mpg overall. That v-8 is sweet and at a steady 70 on the freeway gets around 31 mpg. A very pleasant surprise.
 
Another pleasant surprise, with the collapse of oil prices, gasoline prices in Kansas City area have dropped from a high of around $4.50 to around $1.50 per gal. So I am saving a few dollars at the pump (and losing thousands in the stock market).
#7219 of 8143
Re: Porsche Diesel [houdini1] by jlbl
Nov 25, 2008 (11:20 am)
Reply

Replying to: houdini1 (Nov 24, 2008 7:10 pm)

Hey Dan, nice to hear from you.
 
I'm doing reasonably well, given the circumstances.
 
My 335d coupe is a joy now that her engine is easing after 12500 miles. The only thing I miss is manually shifting—though I use to drive her in M mode most of the time. I'm really satisfied with this car. 530d was more fuel efficient, but 335d is more a driver's machine.
 
Thanks for asking,
Regards,
Jose
#7220 of 8143
From the NYT today.. by kdhspyder
Nov 25, 2008 (4:35 pm)
Reply
There's a good ride and drive report on the writer's time in the new Jetta TDI. It's a good fair appraisal IMO.
 
Jetta TDI
#7221 of 8143
Local Prices 11/25/08 by altair4
Nov 25, 2008 (6:09 pm)
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RUG down to $1.999 with Diesel at $3.109. Price spread as a percentage currently rules out the Jetta CleanDiesel as a viable alternative for a replacement to our aging Accord.
#7222 of 8143
Re: ... Diesel Design Thoughts [roland3] by roland3
Nov 27, 2008 (2:10 am)
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Replying to: roland3 (Nov 22, 2008 6:26 am)

... If you look "fuel claims polarise opinion" in Google News you will see some controversial fuel droplet research conducted by Professor Tao of Temple University. This is quite a bit related to the theory behind Green Diesel Corp's new injector; however one relying on a mechanical means and one system using an electronic method to achieve the same goal, more complete fuel combustion. I think there should be some regulation induced incentive for these very sophisticated Diesels in that for reduced carbon and soot output there might be a Diesel only reduction (not to apply for gasoline engines) in the NOx regs that are strangling the industry.
#7223 of 8143
Re: ... Diesel Design Thoughts [roland3] by winter2
Nov 28, 2008 (7:44 pm)
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Replying to: roland3 (Nov 27, 2008 2:10 am)

Interesting comments. An interesting issue here. As gasoline engine compression ratios increase, and more of them are moving toward direct gasoline injection, they are starting to run into some of the same issues diesels have had, namely particulate and NOx. Higher compression ratios are more conducive to the formation of NOx. Particulate in direct injection gasoline just may become a problem. Particulate comes from the incomplete combustion of fuel. In gassers, add the fact that sulfur content is 30 PPM versus less than 10 PPM for U.S. diesel fuel, you add to the particulate issue. Granted 30 PPM is pretty small, but considering that 97% of vehicles in the U.S. are gasoline powered, it adds up.
 
In the newer diesels, piezo-electric injectors are becoming more mainstream. They can inject seven plus injections quickly to cool the air charge and produce a very clean burn. As for particulate, there are self-regenerating particulate exhaust filters and appropriate catalysts and urea spray systems to reduce NOx.
 
Does anyone in the forum know how effectively the urea injection system reduces NOx?

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