Quote:
Originally Posted by wparsons
How are you expecting the twin screw to flow more air than it already is at a given RPM? Pressurizing the air before it gets to the blower won't make it flow more air...
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Yes it does.
That's what "compound boost" is all about. It multiplies whatever is fed to it.
Rather than trying to explain from scratch, here's something prepared earlier, from Wikipedia:
"compounded boost is always produced as the pressure ratios of the two compressors are multiplied, not added. In other words, if a turbocharger which produced 10 psi (0.7 bar) (pressure ratio = 1.7) alone blew into a supercharger which also produced 10psi alone, the resultant manifold pressure would be 27 psi (1.9 bar) (PR=2.8) rather than 20 psi (1.4 bar) (PR=2.3). This form of series twincharging allows for the production of boost pressures that would otherwise be unachievable with other compressor arrangements and would be inefficient."