Turbo efficiency

[upngo50]

I think I read somewhere that turbos are more efficient at making boost and/or horsepower than a supercharger. Is this a true statement and if so why?

[1slo5.0]

I don't know a whole bunch about turbos but I can tell you that a supercharger uses horsepower to make power. It takes X number of horsepower to turn the impeller. A turbo works off exhaust gas and draws a minimal amount of horsepower.

[Kool Rock Steady]

I think the main reason is drag on the crank to spin and it's always putting tension on the crank pulling on it too. It can make a lot more power and sounds a lot cooler too. Making full boost @2000 rpm is a reality too with different impellers

[67stang]

Besides the differences in how they’re driven (engine vs. exhaust), the biggest reason a turbo has the potential to make more power is that it is an actual compressor a roots type blower is not. It builds boost by moving more air than the engine displaces, while at the same time beating the crap out of it. When you compress air to a given psi there has to be a temperature gain, how efficient the compressor is determines that amount. A turbo is very efficient, in the area of 80 to 85%; a blower is only 50 to 60% at best. This means the out let temp of a turbo will be much lower than a roots type blower and more of the pressure you see on the boost gage is actually “boost” and not heated air.

[upngo50]

That was what I was looking for thanx!!!!

[SHOfeartotha98]

they are more efficent due to the fact that they are driven by the exhaust gases vs being driven by the motor off of a crank. then if u hook up a intercooler the efficentcy with rise. but without it u cant run to much boost due to the amount of heat they produce