i run a cossie 4wd turbo, no 360 degree bearings or owt, but a 0.48 cossie housing and modified downpipe.
i have a 1,8zvh with megasquirt MS2 v3.0 running things and siemens deka 63Lb injectors.
i start making boost just over 2000rpm, full boost at 3100rpm limited to 22psi due to map sensor and lack of bravery for more.

i've thought of going for T34, but no real gains for me, no better ve efficiency and no real gains on boost, just more lag due to T4 compressor wheel and housing.