View Single Post
Old 10-03-2011, 11:15 PM   #15 (permalink)
Patrick
Master EcoModder
 
Patrick's Avatar
 
Join Date: Apr 2008
Location: Northern Florida, USA
Posts: 510

Hot Tamale - '10 Toyota Prius III
Thanks: 27
Thanked 96 Times in 70 Posts
Quote:
Originally Posted by tjts1 View Post
No it doesn't. Taller gearing means lower RPM for a given speed therefore reduces manifold vacuum (higher absolute pressure) and reduced pumping losses. The amount of power to overcome rolling resistance and aerodynamic drag remains the same.
Power remains the same, but RPM is lower, therefore torque must be higher, requiring a larger throttle opening.
  Reply With Quote