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A turbocharger unit mainly consists of a centrifugal compressor and a turbine coupled together by a solid shaft. This is employed to boost the charge air pressure of the engine. Turbocharging in modern diesel and gasoline engines have become a common and essential operation to result higher power outputs, lower emissions, improved efficiency and refinements from a similar capacity of naturally aspirated engines. The automotive turbocharger system is a source of synchronous and asynchronous noises that should be eliminated or reduced for passenger comfort. Subjectively, a high whistle noise was audible in the passenger cabin during in a mid-rpm range drive in all gears in a 4 cylinder diesel vehicle. Objective noise and vibration data confirm the issue as unbalance whistle. A detailed study has been carried out to identify the source and radiating part of the unbalance whistle noise generated in a 4 cylinder diesel engine running a passenger car.