Quote:
Originally Posted by auroan
You have all the components. But described it wrong. Air into the compressor is at atmospheric pressure or may be a little higher if you take into account the ram air effect when the vehicle is travelling forward. It may be heated a little by that but not significantly.
You are thinking of the compressed (boosted air) which is "after" the compressor. This is why we have intercoolers. To cool the compressed air before it enters the inlet manifold.
You are also thinking of compressor stall. Either way only exhaust gases "power" a turbo. If you disagree do some more reading.
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I am not thinking of the compression air at all. At lower engine speeds the air traveling into the compressor travels at a slower rate. Depending on how that air is directed it can suffer heat soak and the air temperature rises. The turbo has to work harder to produce the same amount of boost. If the turbo is unable to work harder it will be producing less boost and the compressed air will be higher in temperature. If the intercooler is unable to get the charge air temps down. The air will be less dense and the engine will be down on power.
If the air inlet temperature to the compressor remains cold and free flowing, the air is already dense, the air can travel faster through the compressor wheel aiding the turbo to spin up easier and faster, the turbo doesn't have to work so hard, it operates at a cooler temperature, the compressed air is at a lower temperature leaving the turbo meaning the intercooler can do a better job of providing colder denser induction air.
Just because the exhaust gasses do most of the work, you would be wrong to assume they do all of it.
If you disagree try observing it on an engine dyno. Much more informative than just reading books.