| and airflow, and have maximum efficiency, but the rotating assembly in the turbo is spinning over 100K RPM. The rotational speed of the group, in addition to the pressures put on the thrust bearings and radial bearings, are going to cause more wear on the parts than if it is run at a lower pressure, lower airflow, and LOWER efficiency. As an example, take a look at the GT28RS map:
 Look at the point on the map that corresponds to a pressure ratio of 2 and airflow of 17#. You can see that the efficiency of the turbo is at 72%. Now look at the point of a pressure ratio of 2.6 and an airflow of 30#. The efficiency of the turbo is still at 72%. So you can see, there is no change in efficiency of the compressor between these two points as they are both at 72%, however, running the turbo at a pressure ratio of 2.6 and 30# of air per minute is going to create considerably more wear on the rotating group (namely the bearings and seals). The efficiency has NOTHING to do with longevity of the turbo. All the efficiency tells you is what the temperature of the air is going to be when the turbo flows "X" amount of air at "Y" pressure ratio.
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Incorrect Spee. You can run the turbo at high pressures - 
