I am also interested in knowing, my RS220 been acting up since day one of ownership i rarely get max boost out of this car its been to the dealership a few times and everytime it comes back with no faults detected.
The last visit they replaced oxygen sensor as it wasn't responding. So took the car for a good drive .. could not get it to boost to specified boost ... then suddenly out of the blue the car performs beautifully..... full boost etc.
So now i started taking note of when and noticed that it would not boost full while in the 80Deg Celsius range only once it gets to about 90Deg coolant temp does this car go like stink.
What i don't know is why it's such a struggle to get it to that temp, the car would be at about 95Deg and going fine then suddenly it's low 80's and you would struggle to get it higher, and performance pulled back again.
I need some answers or something to rectify this 🤔