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Old 11-05-2013, 08:43 AM   #15
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If you drive in higher elevations, another factor to consider is that naturally aspirated gasoline engines will lose between 3% and 4% of their power for every 1000 feet of elevation as air density decreases. Therefore, at 10000 ft elevation, only 60% to 70% of the engine's sea level power is available. Turbocharged diesel engines don't experience this power loss until much higher elevations - for instance, Cummins turbodiesels maintain their sea level ratings up to 10000 ft elevation. That's because the turbocharger merely spins faster as elevation increases (air density, and therefore load on the compressor impeller, decreases) and pushes more of the thinner air through the engine - that is, mass airflow (lbs of air per minute) remains constant - up to the RPM limit of the turbocharger.

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Old 11-05-2013, 10:21 AM   #16
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IMHO, the way to ruin a diesel engine is to put too high gear ratio rear end (lower number) behind them. I had (2) 01 Dodges (totaled 1st one) that were the same except the early one had a 3:54 and the present one has a 4:10. There was very little difference in fuel mileage but a lot of difference in performance. The early model I was shifting down every time I started up a hill. Not now. I think the problem is the 3:54 reaches the sweet spot @ 65/70 and the 4:10 at 60.
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Old 11-05-2013, 02:02 PM   #17
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Quote:
Originally Posted by CD View Post
IMHO, the way to ruin a diesel engine is to put too high gear ratio rear end (lower number) behind them. I had (2) 01 Dodges (totaled 1st one) that were the same except the early one had a 3:54 and the present one has a 4:10. There was very little difference in fuel mileage but a lot of difference in performance. The early model I was shifting down every time I started up a hill. Not now. I think the problem is the 3:54 reaches the sweet spot @ 65/70 and the 4:10 at 60.
What about the newer diesel trucks; I know Ram's 2500/3500HD only are offered with the 3:42 Differential on the SRW models only. This is for the MY2013 and on trucks and to meet the mandated fuel economy by the FEDS.

This statement may have been true in the past with the 4 sped auto's but not with todays trucks that have the 6 sped auto double overdrive transmission in them.

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Old 11-05-2013, 02:09 PM   #18
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I bought my first diesel pickup this spring. I will never own another gas truck as long as i live. It is a new experience learning the maintenance. If you get the Chevy Duramax there a a very helpful forum. Duramaxforum.com.
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Old 11-05-2013, 02:42 PM   #19
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Go to a rest area and sit looking at the real trucks stopping and count the number of gas trucks pulling real trailers. They are all survivors and making the driver smile.
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