I thought I'd better go back and check your assumptions.
The 2.17 number you quote is the DENSITY RATIO required for the 1.6T to make 620 hp @ 10.5 kRPM, assuming the same VE and TE as the 2.4 V8. The pressure ratio required to achieve this density ratio (at 80% compressor efficiency and no intercooling) is about 3.25 ie 3.25 bar abs boost. Discharge temperature is about 190*C.
With a typical intercooler, the pressure ratio required will be about 2.3 and compressor discharge temperature about 140*C.
The cars will need intercooling.
I beg to differ somewhat here, do you really think you need a 2.25 Bar boost to bring a 1.6 liter racing ICE to produce 620 Hp at 10 500+ Rpm,
still believe that a 1+ Bar boost will be quite enough and that they can do without intercooler all things considered?
Such a shame we might never know as I suspect they will keep the V8s after 2013.
Edited by Rasputin, 11 October 2012 - 09:12.