TURBO'S V SUPERCHARGERS - Pros & Cons:


Turbo Pros ( + )

Only one, where max boost/max power is required in full race, track application, where other considerations can be rejected, e.g. cost to build and develop, life expectancy etc.

Turbo Cons ( - )

Much higher boost pressure needed for the same bhp due to pressurised air being much hotter, due to conduction from red hot exhaust manifold.

Much more complex management needed to control fuelling and ignition due instantaneous rise of boost pressure.

Higher pressures and temperatures encouraging detonation, the big engine destroyer.

More intercooling needed to cool inlet air.

Much higher under bonnet temperature making everything hotter and so reducing power.

High under bonnet temperature reducing life of things like wiring looms and hoses.

Much higher incidents of fire due to red hot turbo and manifold.

Compromise exhaust manifold and system function due to restriction of turbo not letting the gas flow freely.

Extra shock loadings on transmission due to sudden increase in power


Supercharger Pros ( + )

Basically all the things the turbo is bad at the supercharger is good at.

Supercharger Cons ( - )

No dump valve to make a nice noise
 

For those building their own kit I would recommend always going to a charger 1 size above what the engine capacity suggests, as the price for the next size higher is quite small and if necessary put a restrictor in to reduce the boost. The reason I say this is that most people start off with quite modest expectations but as soon as they have it fitted they want MORE and if the charger they have already fitted is running at max capacity, they have to discard it and buy a complete new unit. This problem of running out of charger capacity is especially a problem if the engine is 1) High revving e.g. over 7000 rpm. 2) 16 valve unit, as they eat air quicker than 8 valves. 3) The compression is lowered.

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