Re: [ST] Supercharge vs Turbo

["Jim HIGGINS" <buellrydr1@xxxxxxx>]

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.


>From: "Chris Harwood" <Chris@xxxxxxxxxxxxxxxxxx>
>Reply-To: ST@xxxxxxxxxxxxxx
>To: <ST@xxxxxxxxxxxxxx>
>Subject: Re: [ST] Supercharge vs Turbo
>Date: Fri, 03 Feb 2006 10:31:17 +0000
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>
>What about back-pressure in the exhaust?  Particularly when spinning-up.
>  Turbos must make it more difficult to clear the cylinder for the next
>charge.
>
>Add Jaguar (Ford) to the supercharger camp.
>
>Chris Harwood
>00 RS
>
> >>> robertr@xxxxxxxxxxxxxxxx 03/02/2006 00:58:04 >>>
>This is always a contentious one.
>
>Supercharge:
>Almost instant response
>Usually heavier then turbo
>Usually requires case mods to get a drive to the pulley
>Sucks horsepower so the first bit of boost is wasted fighting
>mechanical
>losses, varies depending if Rootes or vane type
>Can put undesirable side load on case bearings not designed for the
>extra
>pulley hanging off the end.
>
>Turbo,
>Very little wasted boost
>Exhaust plumbing
>Lag
>Risk of overboost without a waste gate
>Can have problems with shutting down if you don't let it spin down
>before
>turning off the engine.
>Modern turbos minimise the lag problem.
>
>If you look at cars, Saab, Audi and others go with Turbo, Mercedes, GM
>others go with Mechanical (though GM have also used turbo), so it comes
>down
>to the Mfr in-house technical and marketing strategies. Fuel dragsters
>use
>mechanical, Nissan and Ford used turbo in their group 'c' sedans that
>were
>almost unbeatable.
>
>Confused?
>
>Cheers
>R
>
><<
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