Diesles and elevation
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From: AZ
Diesels and elevation
I will be doing a trip to Colorado later this summer and some one told me that diesels do not like elevation too much.
How much of this is true?
The exact location I'm going to is Ouray.
How much of this is true?
The exact location I'm going to is Ouray.
Last edited by KING; May 27, 2005 at 11:50 PM.
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From: Aggieland, TX
Originally Posted by Fire Rooster
The older diesels didn't. The new ones no problem, that is what you have a turbo for.
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From: New Hampshire
pulled my 5ver, (10k lbs.), up some long grades coming home today... started off taking it easy on the girl...(60 mph or so in drive), but... the more she ran.. the better she ran... she got to the point where she was pulling some moderate grades and holding 72-74 mph in overdrive no less..! one other thing... egt's seemed to come down as she started pulling the hills better... anybody have any theories on why this might be so..?
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From: Rio Rico, AZ.
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Postmaster
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From: New Hampshire
ahhhh. i wondered if that might be the case... but...if that's true then why wouldn't she run lower egt's running down a gear.... higher rpms and even more boost.. (22 instead of 16)...? i thought the less you "lug" your motor the lower your egt's are... just wondering kwik... is it possible that blowing the soot out of the stock exhaust helps to lower your egt's...?
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From: Rio Rico, AZ.
Hmmm, I'm kind of guessing here that higher RPM=more combustion events per minute, creating more heat that has to be carried off. Even with the greater air mass in the combustion chamber, it just can't keep up. I don't think that cranking the boost to 60psi at high RPM for even greater air maiss(just an arbitrary value for the sake of discussion) is the answer either, blown boots and head gaskets aside. You get into the realm of diminishing returns due to the turbo generating it's own heat from the compression and blowing it down the intake's throat.
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From: New Hampshire
that makes sense kwik... she took about a half hour of towing to heat eveything up and clear her pipes a couple of times, then she started to pull real well... in od, i would slowly step on the acelerator till she got up to 16 or 17 lbs of boost and running around 75 mph... and just hold the peddle in place... she would back down to 70 or so and loose a little boost... but... she would stay in od and pull the hill with the egt's 100 degrees or so less than when i was down a gear and running 62-65... that's what i REALLY love about gauges... they let you learn how your truck runs and you can adjust how you drive to how she likes to be driven..!