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Originally Posted by Calum
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not at all. twin-screws with bypass valves still have to act like a supercharger even under low load due to the design. roots at low load consume fractions of a HP but this contributes to what the article said about twin screws boosting faster.
on a side note Eatons TVS (roots style with 4 lobes and 170deg of twist on the rotors) is more efficient thermally than the twin screw, and boosts just as fast while still consuming less hp than a traditional roots or a twin-screw over the whole rpm range. and uses again a fraction of a hp under low or no loads.
overall TVS is best but the one we want for this car isn't in production (R1050, Next gen R1100). twin-scew is better than a traditional roots type set-up.