Timing and stock sensor question
 

This ? isn't exactly S-AFC specific...more piggyback specific.

I am running a full T04-S on my S4 TII with an E-manage

I will be running about 16-18psi and Im curious of a couple things that will happen when tuning on the stock map with stock sensors.

1. If I bump up the airflow signal to add fuel (as opposed to just dialing more pulse width) at what point will the ECU correct this with timing? will it at all?

2. What will happen when the factory boost sensor sees 18psi? (even though there is an FCD)