Intake plenum and 911 throttle body

[jaykay]

Nice ....so stock plenum boots can be used as the tee diameters match the plenums? This is a major potential loss area when using the 997 diverter tee.

If it puts the tb in the same you might be able to work with the stock 3.2 intake tube ....modified get the end

Originally Posted by Ben006

As I say on the top of this page, around 300$, but I will depend on wethet I need to paint it or not


I will try to get it on the dyno, but I can't garantee it :/
The testing will be more about reliability. I will put it on my car, and abuse it, then take it off and see if there is any problem.
Then, if I decide that it's good, you will get some


I hope the sensor was the problem, will see next week if the CEL comes back.

Yes, the TB will sit at the stock location

Ben

[KRAM36]

Originally Posted by jaykay

Nice ....so stock plenum boots can be used as the tee diameters match the plenums? This is a major potential loss area when using the 997 diverter tee.

If it puts the tb in the same you might be able to work with the stock 3.2 intake tube ....modified get the end

I don't see where the 997 Distribution T being larger then the plenum openings would be of any hindrance to the air flow. I used the stock plenum boots, no problem using them.

[jaykay]

Originally Posted by KRAM36

I don't see where the 997 Distribution T being larger then the plenum openings would be of any hindrance to the air flow. I used the stock plenum boots, no problem using them.

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.

[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.

[jaykay]

Originally Posted by KRAM36

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.

"Right against" sounds like the worst condition. Essentially you have a small pipe inside of a large pipe with flow going to and into the small pipe. The flow hits the edge of the small pipe. This arrangement is covered by the boot. Sketch it out and you will have it

An increase in velocity may be good here but in this case it is accomplished in an abrupt turbulent fashion which is probably not beneficial to efficient cylinder filling....it all depends on the whole system.

Bens design would accomplish this velocity incease in a gradual non turbulent fashion which could help cylinder filling. There would also be less stress placed on the boots with an equal diameter arrangement. The spatial restriction imposed by the large 997 outlets is also eliminated.