So far i have yet to see technical info on the various turbos used in turbo-diesel cars, Skoda Vrs etc. By technical info i mean compressor maps, housing, trim, even manufacturer etc.
Do you want info on any particular model? I dont think you would be able to find indepth info from a car manufacture but the best bet would be to get the part no and manufacture and trace it from the turbo manufacturer. I remember Tata safari used KKK turbo with the boost starting at 1500rpm.