View Single Post
Old 09-13-2013, 06:43 PM   #52 (permalink)
Tesla
Master EcoModder
 
Join Date: Feb 2012
Location: Australia
Posts: 355

The Truck - '02 Nissan GU Patrol ST
Thanks: 5
Thanked 76 Times in 50 Posts
Just found this study on plenum volume and efficiency.
http://muhserv.atauni.edu.tr/makine/..._files/A/e.pdf

Although they talk in terms of increased volume, the experimental design describes the use of throttle body spacing, they found overall improvements from 1,700-2,600 rpm at the expense of reduced performance beyond 2,600.
I'm guesstimating they used around 1" & 2" spacers on the bases of a 2 1/2" diameter intake duct, bigger than 2 inch reduced overall performance.
  Reply With Quote