Turbocharged engine, depending on the engine exhaust combustion gases drive a turbine to rotate, so the air is pressurized. Therefore, as long as the engine is at work, it will rotate the turbine, the turbine has been involved in the work, but not after the turbo engine reaches a certain speed before intervention work, which is wrong. Theoretically, the higher the engine speed, the higher the resulting turbo, but the engine and turbo always have a safe or appropriate operating pressure range, so it is necessary to increase the pressure relief valve, rover turbo which is why turbo engines has a broad range of torque output, such as the range of maximum torque S7 1750r / min --- 4500r / min, i.e., the engine speed is within the above range, the maximum continuous output torque will be 320 Nm, Note here that, the turbine is not when the engine speed reaches 1750 when work began to intervene, but at this point it has reached optimum working condition. In other words, when you look at the throttle turbine that had already started work, in 1000, when perhaps you can turn the output torque of 200 nm, and in 1500, when might reach 300nm (depends on the specific engine operating curve) when 1750 when the maximum 320nm, and continued until 4500 rpm. Of course, there will be turbocharged engine turbo lag phenomenon occurs torque flashpoint, but this is not reflected in the turbine have started working. Design better turbocharged engine turbo lag more obvious, and even less experience, such as PSA and BMW jointly developed 1.6THP (here not advertise), volvo turbo but there are some structural design flawed turbocharged engine, will gives a very obvious turbo lag phenomenon (low torque insufficiency), for example, the Great Wall of 1.5T (this is not slander). As to how the S7's engine performance, professional test drivers must be verified and markets.
So please those who are ignorant not to mislead
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