530D Safe Mode

[HenriTh]

Hi

I have a 530D with DPF removed, remapped, and chipped
Last week i was in Germany
I could max reach 240 kph (149 mph)but after a few seconds it went i some kind of safe mode.
My gaspedal feld dead for around 20seconds.
I tested it a few times, and everytime i reached 230 240 it did they same

Anybody clue whay it can be?
Meybey air leak in Vaccuumhose, underpressure ?
I assume i should get more out of it then 240, and it also should not go to same mode.

I have not managed to check this, since a have to demount inlet manifold to check, and this moment i am waiting for the postman with my delivery of blank plates