How does the compressor output of a turbo-charger unit relate to manifold pressure?

The compressor output of a turbocharger unit is generally greater than the manifold pressure due to the increased pressure produced by the compressor as it compresses the intake air. In a turbocharger system, the turbine extracts energy from the exhaust gases, which is then used to drive the compressor, allowing it to draw in ambient air and compress it before it enters the engine's intake manifold.

As the compressor works, it increases the density of the air, resulting in a higher pressure output than the ambient pressure in the manifold. This excess pressure boosts the engine's overall performance by allowing more air (and consequently more fuel) to enter the combustion chamber, enhancing the combustion process and enabling greater engine power output.

In contrast, while the manifold pressure can vary based on engine load, speed, and throttle position, the role of the turbocharger is to consistently generate a pressure that is above the manifold pressure, especially under boost conditions contributing to performance gains.

This relationship helps in maintaining the necessary air-fuel mixture for optimal combustion efficiency, making the option indicating that the compressor output is greater than the manifold pressure the appropriate choice.