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Turbocharging diesel automotive engines has been a major approach toward improving their performance conditions and consequently, reducing the air pollution contributed by their exhaust emissions. The components of the turbocharging system discussed in this paper were compressors with improved performance characteristics, turbines with small inlet areas, waste-gate valve, and fuel control device (necessary for fueling schedule and engine speed control). Matching these components as a system and as well as to the engine was a major issue. The main purpose of the matching procedure was to develop and fit a turbocharging system with most suitable performance characteristics to the engine in order to obtain improved engine thermal operating conditions as well as an overall vehicle performance. An application example of the concept was performed on an eight-cylinder, direct injection, heavy duty diesel automotive engine predicted for urban city bus.