Yes the pinny is runnig stock internals the only thing I have tried to lower compression by using a copper head gasket couldn't get it to work so I am about to put a standard head gasket back on.
The toyota blower is of an 85 1ge gze import in OZ the motor was a 6 cylinder twin cam 2lt.
I am running it at a 1:1 gear ratio which gives me 4psi on say a V6 commodore the run it at 1:2 Gear ratio and get 10 psi. They have put two of these blowers on a ford V8 5.7lt and pumped 16psi. Hope that gives you an idea of what you can do with this awsome jap blower