I would have thought you should be able to feel 8psi of boost coming in. Obviously you are around 10psi down if max boost is 18psi/1.2bar. It looks like it's a problem in boost management which is probably going to be cheaper to fix than a turbo rebuild. Could be a waste gate problem or an air leak. Apparently, the base of the plenum chamber is a notorious leak point. It seems you are sniffing along the right path!
hi ! Thx for this tip !
Have you noticed some oil deposit on right intake air hose or after throttle body ?
This valve is situated under (the 2) air filter, a bit next to ? like a bypass turbo to air Hose induction ? mentioned "pop-off valve" or "wastgate" in manual ?
Can you post some pictures ?
I get a little deposit of oil in the left air intake ( the right when you are front of your car).
My car don't smoke, but i find some burned deposit on rear bumper, and smal leak under exaust.
I think oil is coming from oil-vapor convertissor, and re-injected in air intake.
Any idee ?