Why still no dive acceleration difference?

[Crumpp]

Does P47 need to reduce manifold before dive?

Yes, if he does not the airload will increase his manifold pressure and the waste gate will open to depressurize the system.

You understand the turbocharger requireds very gentle throttle movements. If you reduce power too fast, you can depressurize the system and you basically have a very poorly normally aspirated engine for the next 30 seconds until the turbine spools back up to repressurize the system.