This is the newly patented AJP turbo "boost regulator". When any of the large companies copy and replicate this idea for mass production at least give me some recognition and gratitude.....You're welcome in advance.
In the SHO and probably other ecoboost cars especially in automatics I think, there is an inherent nature to have boost spikes upon WOT upshifts...The turbos are spinning fast just before the shift then the engine RPM's suddenly fall and the turbo doesn't slow down fast enough and the engine isn't consuming the air at 4500 like it was at 6000. So airflow builds and boost spikes
If the throttle is left open then boost will spike...Ford uses the throttle in this case to close, then you get TIP spikes...When the throttle closes briefly it keeps MAP down to what it should have but the TIP pressure will spike because the airflow hits a wall(Throttle blade).
I've tried many ways to make the wastegates more responsive and adjust wastegate duty cycle tables but nothing worked well.
In a perfect world you want the throttle open for performance benefits but no boost spikes....I'll post pics of the benefits..Boost spikes are bad for fuel pressure, stft's and knock....Abrupt increase in load(boost) cause knock, fuel pressure gets depleted because fuel trims will increase to maintain afr because when pressure falls more injector duty is needed which sucks fuel from the rail...Pressure falls which can also lead to knock in direct injection where pressure is critical