I think that turbo is too big. I am using a GTX2863R and I don't start to even see boost until 2000 RPM, and fully spooled by 3600 RPM, but then again I am running much higher pressures, and for a different intended purpose than you are wanting to do.
Specs below for my turbo.
Compressor - GTX2863R
Inducer - 47.1mm
Exducer - 63.4mm
Compressor Housing - GT28 with Anti-Surge Machining
Inlet - 3"
Outlet - 2"
A/R - .60
Turbine - GT28
Inducer - 53.9mm
Exducer - 47.0mm
Turbine Housing - T31
Inlet - T3 flange
Outlet - 2.5"
A/R Ratio - .82
CHRA
Dual ball bearing
Water cooled
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