So just got in from the dyno session.
Firstly, the car will only hold around 18-19psi between 6-7k. The wastegate duty goes from around 70% at 4500 to 95% and boost tails off from 21psi in midrange. I cannot pressure test completely due to the intake issues so there is a possibility of a leaking DV. Once Gaz sorts out this out we can test properly.
The car was run up a good few times, they water meth, moderate boost and climate controlled dyno cell meaning the car stayed cool and consistent. The closed loop boost control is right on the limit of what it can handle and although it is spot on in every gear on the road peaking at 21psi, it spiked around 26psi on the dyno before coming down to 21psi and eventually 18psi at peak power.
This means the torque figure is a little inflated from what you will see on the road.
However, the figures are pretty impressive - 379ftlb at 4100rpm - 352bhp at 6291rpm.
On the road, the peak torque is probably around 3500rpm which makes this a very fast, very useable S3
Hopefully Gaz is smiling, and well done Dan for a cracking little turbo
Rick