Turbine housing for a turbocharger and corresponding turbocharger

The invention relates to a turbine housing for a supercharger, comprising an inlet opening, a turbine seat and a race extending from said inlet opening to said turbine seat, said race comprising a first spiral chamber (7) which mouth into said turbine seat and a second spiral chamber (8) which mouth into said turbine seat. According to the invention both the first spiral chamber (7) and the second spiral chamber (8) mouth in a first angular segment (²) of the turbine seat, the axial height of the mouth into the turbine seat of the second spiral chamber (8) in said first angular segment (²) is bigger in the end of the first angular segment (²) than in the beginning thereof seen in a flow direction (F), and in that the A/R-ratio of the first spiral chamber (7) is smaller than the common A/R-ratio of the first spiral chamber (7) and the second spiral chamber (8).