That is one of many other calculators that we often use for some applications we engineer.
http://www.skf.com/group/knowledge-centre/engineering-tools/skfbearingcalculator.html
Of course Porsche's R&D have designed better formulas, but it could give you a head start selecting a, perhaps?, better bearing than what Porsche initially came us with.
Bearing life, frictional moment, frequencies, viscosity, dynamic bearing load, etc etc...