Hi Alcaid,
do you have a compressor and/or turbo map?
I would be interessted to find out, how the turbo would be on a BMW 325TDS / 525TDS (M51). I would immagine that it would be to small for 30 psi of boost on that engine, but what about 23-25 psi (170-220 hp).
If you can get full boost on an 1.6 engine below 3000rpm, it should be instant boost on an 2.5 liter engine, but i would also like to see if surge could be an issue, as the turbo has no enhanced map (anti-surge compressor housing).
Best Regards
Alleslowbuged