It basically consists of two impellers fitted on the same shaft, which rotates on two floating bearings which are lubricated by means of a branch off the engine lubrication system.The oil used disperses some of the large amount of heat which is given off by the exhaust gases at the turbine.There is a wastegate valve (1) fitted on the turbocharger, controlled by a pneumatic actuator (2), which allows the passage of exhaust gases to the turbine to be choked depending on the engine's power/torque requirements.
