My saph had a GT3076r with a 0.62 housing and it was laggy as hell. Showed a similar graph plot to Turbotrev and it was horrible to drive on the road - literally nothing until 4500rpm and then it all comes in with a bang - could not drive that car quick or hard as it would just break traction everywhere when the boost comes in.
This was on aftermarket management too so its not just that but the whole spec