Cody, thank you. That was a very good explanation of the details of diesel turbocharging and I appreciated the videos too. I had no idea it was possible to attain that much intake manifold pressure. I also hadn't thought of the undesirable effects of compressive heating on the air charge on the intake side. It's a bit of a balancing act, isn't it?
And southpaw, I really didn't mean to sidetrack the thread with an argument over the amount of boost possible. I was really just trying to answer one of the questions you asked in your first post: "
The Turbo in general is supposed to offset the effects of altitude found in naturally aspirated engine. So I am wondering why the altitude parameters are needed..." And, I'm going to stand by my original response: That 28 psi boost you have at sea level is not going to be possible with the same turbo in Colorado Springs. Since the ambient pressure there is 11.77, you're probably going to see 23.5 psi. As the ambient pressure drops, the turbocharger has less input to work with - it cannot make something out of nothing. Therefore, altitude has to be a factor in any tune for the engine, right?
Since Cody's a moderator, southpaw, he can make any thread a "sticky" - I don't have to do it! And I agree with your opinion of his answers!
- Jack
Wed, April 29th, 2009, 11:09 AM
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