Intake plenum and 911 throttle body

[KRAM36]

Originally Posted by jaykay

There is a rapid section change from the outlet diameter of the 997 diverter tee to the 3.2 inlet plenum diameter. Inside there is an exposed plenum entrance edge created by stretching the stock boots to fit the 997 diverter tee larger diameter. In 3d one could visualize this as a v-section ring disrupting airflow over it. Section changes and edges generally result in flow losses in closed piping.

This is why I am hoping that Ben has matched diameters....Ben can you verify explicitly?

Of course these assumptions have to be verified with flow testing. Torque power and throttle response being the goals.

When I installed the 997 Distribution T, it was fitting right against the Plenum opening. I don't think there is a gap there to create a V and disrupt the air flow. Also going from the larger to smaller opening could increase the air velocity. Maybe The Radium King could give some better insight on this.