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if you look at how air flows into the end of a plain cut pipe under suction, you will see that a portion (not insignificant) comes from behind the pipe rather than in front. the normal thing to do is use a logarithmic/parabolic (i forget which) curve for the funnel, and to have a small bump before the backing plate to allow it to suck from behind also. unfortunately i dont have time or resource to make funnels, and associated small bumps. hence i said that its "pretty good" but not "perfect" (in my eyes).
i also believe that the air is drawn into the cylinder even when under pressure (atmospheric is just pressure after all) and that although the turbo is blowing and the air has velocity and energy, as long as the plenum is big enough, its just being filled by the throttle, and having "gulps" taken out of it at regular intervals by the engine.
also any velocity that is hitting the backing plate on the far half of the donuts will quickly be reverted by the backing plate.
hope that explains my reasoning.
thanks to those others who commented.
fred.
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