IIRC someone used the VNT15 off of an ALH (1.9 as fitted to the US spec 1999-2003 cars) and it worked quite well. The one in my TDI is making 8 psi by 1600 rpm and full boost at 2100 rpm.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.