What is causing this sudden boost loss. Datalog attached

I know I am pushing the limits of what my turbocharger can give me, but what is this sudden drop of preassure?

Bmw N57 with a single vgt turbo

prerat,

You'll want to look at your VGT position to see if it corresponds to the boost drop. If it does, the ECM is likely pulling boost for some reason. There are many reasons the ECM may choose to limit boost, compressor speed protection is probably the biggest.

Nick

Thank you for taking the time to give me a very good answer Nick!

I will look at what you said at first opportunity 🙂