No, I'm not asking how much additional HP is added by a supercharger.
The laws of thermodynamics tell us that nothing is free. The belt is spinning the supercharger whether the wastegate is "using" the air or not. I haven't studied the airflow paths but I presume when the SC's output isn't being actively used, its output side is dumped to atmosphere to minimize backpressure on the SC, belt, and engine. BUT... there's still friction.
What is the effective HP consumption for a typical SC for engines in this size range? It cannot be zero. There is a cost for having the SC available. Does anyone know the power cost to have it standing by?
The laws of thermodynamics tell us that nothing is free. The belt is spinning the supercharger whether the wastegate is "using" the air or not. I haven't studied the airflow paths but I presume when the SC's output isn't being actively used, its output side is dumped to atmosphere to minimize backpressure on the SC, belt, and engine. BUT... there's still friction.
What is the effective HP consumption for a typical SC for engines in this size range? It cannot be zero. There is a cost for having the SC available. Does anyone know the power cost to have it standing by?