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Message: [QUOTE="superpsd, post: 1042126, member: 15821"] Older roots blowers had a adiabatic efficiency in the 40-50% range. The M122 I am running is 65% in the sweetest spot of the map. Twin screws like the new Whipple Chargers put the number up to 75% adiabatic and a 99% Volumetric efficiency. i found some information that had a Whipple representative stating that a 2.9 Whipple will take 25 hp to drive the blower at peak pressure which is 25 psi for that unit. So at lower pressures I am sure the parasitic loss is not a major concern. I mean that Whipple only 7.1 Duramax is said to dyno over 1500 hp screaming thru a pair of zoomie headers. Now of course compounds have many advantages but blowers can have their place as well and as technology in the twin screw and roots departments improve superchargers will likely be more useful down the road. [/QUOTE]

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