true a twin screw is not a blower.
but hey, boost is boost even if it is wasted energy
this is what whipple has to say on the topic
Whipple Charger
Centrifugal
Turbo
Roots
Response
Awesome idle-to-redline rpm power. No lag.
Poor low-speed response, similar to "turbo lag."
Poor low-speed response. Turbo lag.
Good low to mid range power.
Driveability
Increased lugging ability in higher gears. Increased power throughout rpm range.
Must downshift to maintain boost level.
Must downshift to maintain boost level.
Increased lugging ability in higher gears.
Engine Torque Curve
Virtually flat curve; ideal characteristic.
Often worse than uncharged engine at low speeds.
Often worse than uncharged engine at low speeds.
Wide range; fall-off can occur at high speeds.
Heat Buildup
Low; intercoolers are usually not needed.
Low; intercoolers are usually not needed.
High; may need intercooler
High; limits boost available.
Noise
Very low noise levels.
Typically very noisy.
Very low noise levels.
Typically very noisy.
Adiabatic Efficiency
70-80%
60-78%
60-75% Peak
40-55%
Originally Posted by blowfishRus6
true a twin screw is not a blower.
