Holset Turbo Specs
There seems to be a lot of miss information on this topic, so I'm going to help clear it up some.
First off what do the numbers mean, for instance a 56/60/12?
The First number is the Diameter of the Compressor Inducer in Millimeters, in this case it's a 56mm compressor wheel.
The Second number is the Diameter of the Turbine Exducer in Millimeters, in this case it's a 60mm turbine wheel.
The Third number is the exhaust housing size in cm2, I'm not going