Hi Jimbo
I am going to start a just over half a bar (8 psi) and see how it goes. John Parker at VPD (
www.v-performance.com) in America is getting 150 Bhp at the wheels with just 6 psi of boost with standrd exhaust / head / cam. With 10 psi this jumps to 170 bhp at the wheels.
Once i have all the bugs ironed out i may rebuild the engine with forged pistons and take the boost up.