Actually it really doesn't surge much. (inless it's below 2k rpm) Or may be I just don't think it's surging. On a dyno after fully heat soaked, it was hitting full boost at 3500rpm. On the street about 3200rpm or so I think. (I can't keep up) The car dynoed 253RWHP and 275ft/lb at 3500rpm at 12psi.
Doesn't the effeciency chage when you have a different turbine housing and a wheel on? I mean the compressor can turn much faster at lower exhaust cfm right?
It really can't beat To4E wheels, there are just more effiecient. Unless 60-1 is in T04E housing.
I was thinking about 50 trim T04E before I got this 60-1
O, I'm about 500ft above sea level. (I got me a GPS)