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Old 03-27-2009, 10:40 AM   #1
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Diesel Engine and torque question.

How well is a diesel engine now? are they clean?
what have changed over the year?

I am looking at the impreza 2.0L turbo diesel.
pushing 150 hp 0-60 in 8.6 second.
6 speed manual
258 lb.-ft. from 1800 rpm to 2400 rpm.

So now the question is, regular gasoline engine
Impreza 2.0L has 145 lb ft @ 3200rpm

so does it mean 145 lb ft max out at 3200 and decrease afterward?

if so, because diesel can pull early and longer, diesel is better?

I just want to know how good or how bad diesel is and why
and what does torque do to performance and which one is better.


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Old 03-27-2009, 10:47 AM   #2
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Diesels make much more torque at lower rpm, and hold it longer for the most part. Diesels are pretty neat, require less maint, and get great mpg. We have a certain diesel at work (15L) that makes 2000ft lbs at 1200 rpm.
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Old 03-27-2009, 10:55 AM   #3
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I read STi is going to have diesel version as well...
so make me wonder how well they performs...

diesel gave me impression of smelly and noise
are they getting better now?

do gasoline pollute more or diesel?
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Old 03-27-2009, 11:39 AM   #4
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yes, gasoline is actually worse for pollution than deisel though desiel looks like it pollutes more cause of all the exhaust you see out of the exhuast pipe. however, the pollutants that are more harmfull are the ones you can't see.
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Old 03-27-2009, 12:22 PM   #5
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the new mercedes diesels are so quiet you dont even know they are diesels. Of course that make me only want the older ones because I like that sound!
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Old 03-27-2009, 01:15 PM   #6
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yes, gasoline is actually worse for pollution than deisel though desiel looks like it pollutes more cause of all the exhaust you see out of the exhuast pipe. however, the pollutants that are more harmfull are the ones you can't see.
i know those you can see are the juts floating. no chemically reaction to the ozon or trap IR and heat up the world.

the only thing i have to think about was the NOx among, it is not as much as the gasoline, but it is going to effect the ozon more.

but seems cas should be in class one... it should be same as gasoline engine. i don worry about the PM... it is probably as much as brake dust LOL and road dirt...

Emission standard in Europe
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Old 03-27-2009, 01:17 PM   #7
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yes, gasoline is actually worse for pollution than deisel though desiel looks like it pollutes more cause of all the exhaust you see out of the exhuast pipe. however, the pollutants that are more harmfull are the ones you can't see.
what about performance?
it seems like most diesel car can run faster than gasoline car...
look at the R8 diesel. it is faster than regular R8.
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Old 03-27-2009, 01:22 PM   #8
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Well, depends what kind of performance, i mean, look at truck pulls, they require torque, and thats why almost all of them are desiels.
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Old 03-27-2009, 01:27 PM   #9
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The pullution you see is usually from an older diesels, or modified new ones. 2010 is the next federal emissions standard change for diesels. We work on 2010 certs which on average we'll say that NOx engine out=750ppm, NOx out of tailpipe=0-10ppm. Urea is crazy. Dodge is the only one (of the big three) that meet requirements now. They do it without urea too. That catalyst costs a ton of money though.
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Old 03-27-2009, 01:29 PM   #10
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I'd rather look at a hp/torque curve than peak values all day long. I remember test driving a Pontiac Vibe GT with my wife a number of years ago. The peak HP was around 185 but what I learned on the test drive was that 185 HP was at roughly 7000 rpm's.

If you want to race around and rev your motor like no tomorrow go with the gas engine. If you drive like a human being you will appreciate the diesel's low torque curve.
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