The car spent the day at Croydon Racing Developments today, and they have found that they need to upgrade the fuel pump. I expected to find a limit in the fuel or ignition system, so this isn't news.
The boost is now controlled very well. The wastegate has a 14psi spring in it, and it sits happily at 14psi. #WIN
It's already making the same power as before at only 14psi and VERY conservative ignition advance levels. The cams haven't been dialled in yet either.
They will run it at higher boost levels once the new pump goes in.
I'm excited!