Quote:
Originally Posted by BrewRifle
Boost builds as the RPM's rise with a centrifugal supercharger...
A very simple division between the two is low-end power that drops off with a positive displacement superchargers vs. linear power with a centrifugal type supercharger that increases with engine rpm. The linear curve from a centrifugal supercharger compliments an engine’s existing power band, instead of working against it like a roots or twin-screw. Another significant benefit is that the efficiency of a centrifugal is much higher, meaning a smaller amount of the work that goes into turning the compressor gets converted to heat with a centrifugal vs. a positive displacement supercharger, and especially so vs. a roots type supercharger. So it takes less energy to make power with a centrifugal, and the power that is created is much more usable power.
Here's an ESS-625 dyno showing the boost building - http://www.bigdynodatabase.com/DynoG...0068-DLSJ5.jpg |
centrifugar 'chargers on the S65 are a thing of beauty... it's like a 6L, 8600rpm monster with zero lag