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The MKIV+ TDI (99.5 and newer) do have VVT Turbo's.
They are controlled in software. Basically the ECU tells the N75 (vacuum switching valve) to open/ close and the vacuum actuator moves the vanes.
I don't know of an easy way to do this in software, but I'd like to give it a shot by manually actuating it.
The chip tuners can probably do this, and probably do . . . Most people claim about 5~10% increase in FE, I'll bet that this is one place that they find that extra economy.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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