In addition to many other new features, the monoscroll turbo features electric wastegate actuation for quicker response and better gas sealing. Active control means that it can be opened at part-load, reducing backpressure and catalyst light-off time… The cast turbine wheel is now Inconel rather than MAR steel, and the compressor wheel is milled from solid.

 

[Source: Automotive Engineering, April 2012]

 

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