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The turbo I have is variable vane rather than variable nozzle. It has the ring of stator vanes around the exhaust turbine that change pitch depending on actuator position.


Care to elaborate on the differences? If I recall, Corky Bell's book was refering to what you describe as a VATN turbo. Could (definitely) be mistaken, though...


It's semantics really.

Some turbos work by changing the area of the nozzle which enters the scroll, Holset I think do one which blocks off one scroll in a twin scroll exhaust housing. I've been calling those "variable nozzle" VATN = Variable Area Turbine Nozzle?
Others have a toroid which moves in, making the path for exhaust gasses into the turbine narrower and accelerating the flow. I guess variable area describes those well.
Garretts ones change the pitch of multiple stator vanes, so variable vane describes them well.

Or you could group the whole lot together as "variable geometry" turbos.