Hello,

Not looking to get into it with you. The atmosphere does change as you go up. The changes are gradual. The changes in the areas that we drive our trucks are just not worth talking about.

Damon

 

Figures and I wanted to learn something new today.

Below is a link to a Wikipedia explanation of the atmosphere. Very informative but you will note that it never says the O2 levels change with altitude.
Earth's Atmosphere

 

Hello,

I hate to disappoint people and since you gave me a link. This is a partial copy of the link. "Earth's atmosphere begins to have a composition which varies with altitude." What was that you said?

More food for thought. Where does oxygen come from? It is produced mostly by organic life. Plants and bacteria primarily. Guess what? In parts of the world where there is more oxygen producing life their is more oxygen. See you learned something today. Glad i could help!

By the way not a whole lot of physics going on here. It is called science.

Later.

Damon

 

i like this thread , my turbo is sized properly and therefore the wast gate keeps the max pressure at 35psi weather at sea level or the ski run only difference is at what rpm the turbo can make the boost is raised as you go up in altitude that is why i said spool up is a little slower

 

Man Damon you are on top of things.

The composition begins to changes at 100 KM, not many roads at that altitude. Full quote below.

"Below the turbopause at an altitude of about 100 km (not far from the mesopause), the Earth's atmosphere has a more-or-less uniform composition (apart from water vapor) as described above; this constitutes the homosphere. However, above about 100 km, the Earth's atmosphere begins to have a composition which varies with altitude."

As for Physics, the following is the definition

Physics is the science of matter and its motion. as well as space and time — the science that deals with concepts such as force, energy, mass, and charge. Physics is an experimental science; it is the general analysis of nature. Its purpose is to understand how the world around us behaves

Sounds like the Science of what we are talking about, Physics.

 

That is correct since that is where you want your waste gate to control.

 

Hello CamperAndy,

Your statement "Below is a link to a Wikipedia explanation of the atmosphere. Very informative but you will note that it NEVER says the O2 levels change with altitude." Is false I just pointed it out to you. What more do you want? Didn't I say it is not worth talking about, twice! If you check further than your link you will find that the atmosphere is not constant around the world and in elevation. The 02 level and hundreds of other things change but they are not worth talking about. I just brought it up initially to point out a technicality and it has gotten out of hand.

By the way the definition that you cited about physics and science proves my point. Science includes the composition of the atmosphere. The physics part is how the atmosphere behaves just like you said so thanks for the help.

Damon

 

Damon,

I guess we will have to agree to disagree, The first time I mentioned that O2 does not change I mentioned it as it relates to where we drive. When I reiterated that the O2 levels do not change as illustrated by the Wikipedia link I was still referring to where we drive. Since the O2 percent is more or less constant to 100 kilometers, I still say it does not change enough to even have been mentioned that it changes a little, as you implied.

 

I live at 6k elevation and routinely drive up to 10k plus. I do not know about the physics or the science of what happens but I can tell what happens at least with my truck. My truck at sea level is a different animal. It spools quicker and is more responsive and less smoke. At 6k where I live it drives just fine but definitely more smoke, less responsive. At 10k it takes even longer to spool, even less responsive and definitely more smoke. My boost seems to remain relatively consistant. It just gets there quicker the lower in elevation I am.

Last summer I was going fishing at a high mtn lake and was climbing a shelf road. It was steep but not too bad and at about 13k elevation. My transfer case decided to take a crap on that trip so I had no 4wd. I was crawling up at a couple miles an hour couldnt build any boost at all. Truck would not go, period, after I got so high. It idled fine and would rev up fine in park or neutral but just could not go once in gear. Had to back down a shelf road a couple hundred yards to where I could get to a switchback where I could turn around. Major pucker factor, one of if not the worst I have ever had. Talk about a smoke show going up the last hundred yards or so before I gave up. Blacked out the whole darn valley. I think that had I been able to use 4 low it would not have been a problem. Just two weeks previous we were up there in my brothers Jeep Liberty and had no problems, that little thing just cruised right up. Aside from no 4 low there was nothing else wrong truck ran great once I got turned around (well didnt need any power to go down). Once I got back to blacktop still at 10k truck was fine, no boost issues at all the rest of the trip or since then.

 

Put a boost elbow in and now I can get it up to about 21 psi. I must have a leak somewhere; I'm going with the $1200 fix from Spearco.

Nick