I have the Brockwat r920 and the AEM air fuel meter in my car and I always had A/F between 11.3 and 12 but today I noticed the A/F between 12 and 12.6 in all gears,I even saw when I shifted gears 14.5 but I let off the throttle immidiatly,when I hit full throttle again it was between 12 and 12.5 again.
My car has K16/24, 5 bar fpr ,new fuel filter,new injectors,new plugs and is tuned to hold 1 bar,I have the tune for about 3 months now and A/F was always good untill today.
Anyone got an idea what could cause this ?

 

No but you can definitely run more boost once you figure it out. 1.2 BAR with the right tune, especially with 5 BAR