Intake air flow modification

[GasSavers_DaX]

Originally Posted by MetroMPG

hi ryland (welcome to the site).

that's the first bit of evidence i've heard in favour of the restrictor.

if turbulence from the throttle plate is a fuel efficiency drawback in throttle bodies, i wonder why carmakers don't use a different design, like a variable diameter aperature rather than a butterfly valve.

I once wondered about an aperture style wastegate, but it would be expensive to create.

If turbulence from the throttle plate is a drawback, then the claims from devices like the Turbonator are definately bunk, as these types of devices do just that - create turbulence.