Abstract: The present invention is related to the housing (60) of an exhaust turbine (32) of a turbocharger comprising a first volute (61) and a second volute (62), each of the volutes (61,62) ending in respective first and second guide tongues (64,66). The gap between the first guide tongue (64) and turbine wheel is smaller than the gap between the second guide tongue (66) and turbine wheel. This tongue asymmetry allows for control of the pulse amplitude emitted when a blade of the turbine wheel passes by each respective tongue. Moreover, by increasing the wheel-to-tongue distance of only the second guide tongue (66) durability requirements can be met.

Abstract: The present invention is related to the housing (60) of an exhaust turbine (32) of a turbocharger comprising a first volute (61) and a second volute (62), each of the volutes (61,62) ending in respective first and second guide tongues (64,66). The gap between the first guide tongue (64) and turbine wheel is smaller than the gap between the second guide tongue (66) and turbine wheel. This tongue asymmetry allows for control of the pulse amplitude emitted when a blade of the turbine wheel passes by each respective tongue. Moreover, by increasing the wheel-to-tongue distance of only the second guide tongue (66) durability requirements can be met.

Abstract: A turbocharger includes a compressor section (3). The compressor section (3) includes a compressor wheel (5), and a housing (12) that surrounds the compressor wheel (5). The housing (12) defines an air inlet (16) that is aligned with the rotational axis (R), an air outlet (18) in fluid communication with the air inlet (16), a volute (14) that provides a portion of a fluid path between the air inlet (16) and the air outlet (18). A variable diameter diffuser (7) extends radially between the compressor wheel (5) and the volute (14), and is defined between an adjustable diffuser wall assembly (30) and a facing surface (17a) of the compressor housing (12).