Blowers
increase horsepower and torque from 20% to 50% on high-performance
motors.They also have greater effect on stock motors because of
poor volumetric efficiency. Roots-style blowers have no boost lag
and no restrictions in exhaust.
These blowers' drivability and street performance applications
are outstanding because compression is dropped down in the motor
to around 8:1. There are no extra steps required, no hassles of
compression-release valves which can be time consuming and are liable
to fail.