Re: [ST] Supercharge vs Turbo

[Paul English <tallpaul@xxxxxxxxxxxxx>]

On Sat, 4 Feb 2006, Jim HIGGINS wrote:

> So you are unaware of the turbos with variable vanes--Aerocharger,Garrett,
> and one other(cannot remember offhand) and the variable nozzle ones like
> used on the 6.0 Ford diesels.Able to respond well over entire rpm range.

>> Usually it is a bit of a tradeoff that works out to be a net gain...at
>> certain speeds. So.. you loose a bit of power to the increased back
>> pressure, but you gain a lot of power because of all the extra air - a net
>> increase. It doesn't work at all speeds though, unless the turbo is able
>> to adjust its back pressure across the whole range.

You must have missed the last sentance above. Variable vanes = variable 
back pressure.
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