Quote from: turbotoaster;75108973mm is the size of the exhaust wheel, its not the size of the turbine housing outlet, trust me i know.
73mm is the exducer of the turbine wheel, which when referring to turbine wheels is the internal diameter of the wheel. The inducer (referred to as OD above and given in inches) is 3.14" which is about 80mm by my reckoning. So the size of the exhaust wheel is actually 80mm which is a good size. Remember, inducers and exducers are reversed when talking about compressors and turbines and follow the direction of flow.
Agree that the housing might be a bit conservative though.


