Re: [ST] Supercharge vs Turbo

["Jim HIGGINS" <buellrydr1@xxxxxxx>]

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.


>From: Paul English <tallpaul@xxxxxxxxxxxxx>
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>Subject: Re: [ST] Supercharge vs Turbo
>Date: Sat, 4 Feb 2006 11:21:41 -0800 (PST)
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>
>On Fri, 3 Feb 2006, Jim HIGGINS wrote:
>
> > Properly sized turbo has no added back pressure,turbo is sized according 
>to
> > intended use,street,drag racing,ralley,etc.So a good turbo system 
>matched to
> > your engine use,compression,etc. will work seamlessly.Look at the
> > Mitsuibishi Eclipse,Rallye,Subaru WRX's etc.The added heat comes from
> > compressing the incoming charge and is overcome with intercoolers/charge
> > coolers.Jim.
>
>No offense, but this is counter to the laws of physics. If it is doing
>work, then it requires energy. It either must get that energy from the
>heat of the exhaust or from the motion of it. If it is getting it from the
>motion, then it resisting that motion aka back pressure.
>
>It is clearly not getting energy from heat so it must be producing back
>pressure.
>
>More accurately said, maybe is that a well designed turbo adds little to
>no back pressure over a stock or poorly designed exhaust pipe, because
>just having a pipe and muffler on the exhaust adds some back pressure.
>
>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.
>
>Turbos are a big win on things like ships or airplanes where the engine
>will be cruising for hours at a near fixed rpm. Then the turbo can be
>precisely tuned for that rpm and it doesn't much matter if it is a bit of
>a loss the rest of the time.
>
>
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