Good summary
That's a good summary of the situation.
It also has a secondary impact that is not often discussed. If you increase the effeciency of the compressor, it takes less power from the turbine side to do the same work. The result of that, is the turbo spools faster and at a give boost pressure it will produce less exhaust gas back pressure.
What you have is a situation were several small, and complementary incremental improvements in the performance of the entire system make a noticable difference.
On my car, since the stock TD04L-13G turbo on a WRX is undersized by the factory, to get good midrange response. Added to that since I live and race at 5800 ft altitude, the effects of operating at high altitude made the workload for the turbocharger even greater.
The seat of the pants improvement in turbo spool and improved midrange power and torque were very noticable.
Larry
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