Turbo vs. Supercharger.

[nealtovsen at yahoo.com (Neal Tovsen)]

> In the case of 
> the VNT, the variable vanes allow a varying nozzle
> effect - ie the gas can 
> be directed onto the outer portion of the turbine
> for fast spool up with 
> low gas velocity, and onto the inner portion of the
> turbine for high 
> airflow and boost regulation.

OK...that makes sense. So why then did the essay say
that they use such small compressor wheels? A smaller
compressor wheel would make *any* turbo spool faster.

It would seem that for a VNT you would want to use a
normal, or even larger than normal, compressor since
the nozzle vanes would allow you to spin it up faster.
I'm not understanding the logic here.

Neal

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