Yannick wrote:
>Well let's make some quick calculations. 1 bar = 14.7 psi. Technically, at
>1
>bar of boost, you have technically 2 bar of absolute pressure. Suppose your
>engine breathe 300cfm (just a number in the air) at 1 bar, it will,
>technically, breathe 600cfm at 2 bar.
Yannick this is technicaly not correct. CFM is a volume measument.
Turbochargers do not improve Volumetic efficiency in most circumstances
(except in a few rare racing and industrial diesel applications), in fact
the VE can be reduced under certain circumstances (small super fast spool
street turbos).
Turbochargers greatly increase the density of the charge. This is where the
power comes from. The volume of the intake charge remains largely the same.
Check out a turbine machine engineering textbook and see from the
equations.
Mike
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