[macrorain]

I have the JB+ on a 320i spec B48 (330e). It's on it's default setting.

What I experience is the following: boost initially rises to around 13-14 psi and stays there, but then at around 4500rpm it starts dropping off again, all the way down to around stock boost when I reach 5500.

Is this the famed "throttle closure" issue, or what can typically be the cause of this?

Thank you in advance for any advice.