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lol the turbo doesn't know that its label says 800 hp though. It only knows pressures, speeds, flows, and efficiencies.
I am confused about this statement? When determining how much horsepower an engine will make you have to calculate the air flow requirement for that engine based off of engine displacement, VE RPM, AFR, BSFC and other parameters. Knowing the variables you can caculate (spreadsheet) engine airflow requirement for each engine operating point, know as an engine lug line. Then you can plot these points on the compressor map to see if it will supply enough air for that operating condition. If your points do not go into choke the turbo will support that power. If the points go into surge that means the engine can not handle the air flow the turbo is flowing and causes the compressor wheel to surge.
 
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