Thanks very much

A sensible boost limit is around 14-15psi, which is where I will draw the line, this should give around 300-330bhp at wheels, and be plenty quick enough, considering the car is very light.

The parts fitted to this engine are capable of running more boost/power, see the link below

http://www.bigccracing.com/shop/prod...0&source=thumb

but it starts to become less reliable the more you push. Both mappers I've used have told me the same thing, which is "making the power is not a problem, keeping the engine together is!", usually turbo bike engines are fitted to drag bikes and they don't tend to do many miles, so reliability is less of a concern to them as it is to me and my 5000 mile per year road car.

If i threw caution to the wind and ran a bit more boost, it'd make around 420-450bhp at wheels with 28psi, not bad going from 998cc's!