OK so update and disappointment...
First dyno only yielded 140KW and 269Nm
That said I have been working 2 weeks (off and on) to find and possibly cure the boost drop without results. However I did fix a leak between the turbo and manifold, a bad leak in the manifold where they forgot to weld it and a sticking wastegate.
I finally found the problem in a last desperate attempt to cure the boost drop. I placed a bracket on the waste gate locking it closed. brought the revs up to 5000-5500RPM and nailed it....

Nothing! still only a measly 0.4bar!
So I started measuring up the turbo and the intake wheel is FAR undersize!

I went to the dyno and made what I could. Even if the boost only saw 0.6bar for a second. At around 4000 RPM it made 140KW (no idea at what boost though - woulda dropped by then already). Hopefully with a reworked turbo it will finally hold 0.6, 0.8 on setting A on the HKS EVC-S and then 1bar on setting B.
Maybe save some face at the next event.

More pics soon too...
