This maybe normal but it doesn't seem right.
Whilst cruising at 50 kph the boost gauge doesn't drop below 7psi, if I travel at 60kph the boost drops to 1-2psi. When going at 50kph & the boost sitting on 7psi, you put your foot down to accelerate the boost goes up over 15psi until the engine hits about 2000 rev then drops to a normal accelerating boost. While it is doing this there's a noise from the turbo which sounds like pressurised air coming out. We had it looked at & have spent $1400 getting it recond. but it's still does the same thing. Can anyone shed any light on this thanks.