Hi. My car has 4bar fpr + vaccum. I want to unplug vacum to get stable 4bar. Anyone knows whats correction map? When i use only FKKVS I get strage results with fueling like -20% on vacum and +20% on boost.

I dont want my fuel pump work on 5.5 bar. It is more efficient on 4 bar. Should I active CWPKAPP like in returnless fuel supply system?

Not stupid at all. I will try it.

And the injectors are much bigger already?
At 1bar it's a 17% reduction in flow.

Actually almost all returnless systems run 5-6 bar for this reason.

Really stupid idea without knowledge of how anything works.
The pressure across the injector is constant with vacuum control, it is not without.

With 1.5 bar boost you will have 2.5 bar effective fuel pressure. Probably need at least 500cc injectors and atomization will be shit. Not to mention what happens with TVUB in vacuum. As on idle now the effective fuel pressure will be 4.5 bar or more.