They're all "always running". Positive displacement superchargers(like
roots and KB) move the same amount of air/engine rpm and produce max
boost at loow rpm and it then stays at that level.
Centifugal superchargers' boost increases with engine rpm reaching a max
at high rpms.
Turbos produce boost based on engine load and can reach max boost in the
midrange, beyond which point it is restricted by the wastegate.
Dr. Pat
hoegen wrote:
>
> my understanding is that turbos only initiate at certain rpms as opposed to
> an SC which is always running. If I am incorrect, someone let me know.
>
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