Swapped the engine in my s3 yesterday and now there isn't any boost controll. I'm sure it's all plumbed in right. I have just disconnected the n75 just now so it's running 5psi off the actuator but when it's plugged in its like it just sticks wide open letting the boost go as high as it wants. It was fine before I changed the engine. I'm thinking the map sensor or n75 could be playing up but no codes were coming up. Any ideas?