Originally posted by Mrk_Mickey
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Eletric boost!!
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apart from the fact that fan type impellers are terrible for creating a pressure difference (why turbochargers are radial flow impellers and superchargers are mostly roots blowers) lets think about this: if you want a roots blower to make lets say a meagre 5 psi, you'll still need about 4kW at the crank (for a really good blower) at high rpm.
so lets say you only want to make 2psi boost with this thing - then you will probably need to suck about 1.6KW of juice to run the fan to make the pressure. i dont know how many of you are wary about these things, but your starter motor also sucks about 1.6kW of power to start your car.
so, you put a 1.6kW load on your engine thorugh the alternator.
P=V*I - power = voltage * current. you have (under load) about 13.3V coming from the alternator if its alright - not being conservative - so you would need:
I=P/V = 1600W/13.3V = 120A of current.
the only electric motors i see around that can make 1.6kW on 12V are starter motors - so unless your electric supercharger looks like a startermotor, with an ENORMOUS fan attached, its not going to work. further, even if it did, your alternator would be maxed out robbing at least 1.6/0.85 (for efficiency) = 1.9kW from your engine, while your electrical leads cook trying to supply 120A to your electric supercharger.'07 Touareg V6 TDI with air suspension
'98 Mk3 Cabriolet 2.0 8V
'99 A4 Quattro 1.8T
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