Actually this statement isn't 100% correct, albeit I used to think the exact same. pspvdk(_w) does come into play in EGFE, BGMSZS. BGRLP and MSDK, and IF the pvd sensor isn't calibrated correctly, it can and will lead to weird adverse effects regarding load and fueling.
thank you. of course the map sensor is partially used to calculate load. Map + MAf. hence why with the 2.5 bar sensor you can run more then 23psi. b5 s4s dont even use psi based boost control. its all load based upgrade your map sensor and you can reach higher loads/psi/mbar whatever you want to call it