Sorry! I completely forgot to update this thread!Just guessing, maybe you don't have some prerequisite for overboost? Like low quality gasoline, missed service interval or even a minor malfunction. Have you tried 100 octane gasoline?
Did you solve the issue? I am having the same problem... https://n-cars.net/forums/threads/no-overboost-function.6361/I update, after six days I have the same problem again. I'll tell you more when I know something.
I will have a look on that... In theory here in Spain all fuels are more or less the same as there is just one distributor authorised. I'll have a try on that.I'd look at the fuel you're utilizing first and foremost. Top tier fuel is considered best for the 2.0T Theta II engine. If you're using anything else, this might be the cause.
I can definitely feel the car struggles to build up the power... I have been speaking with a guy that had the same issue and the problem solved resetting the ECU.It's not suppose to have overboost , if it's the basic 250 hp and not the i30N Performance 275 model.
Personally, I think there's to much concern with a little light on the dash.