See I was thinking maybe my cam... It's strange that it seems to have hit a wall in exactly the same place as my previous turbo (fuelling requirements are identical albeit at a lower boost pressure) and wont flow any more.
Perhaps I'll get a vernier and have a play, a dyno would be very useful yes! lol
But I will be able to tell by how the VE changes and also if it has an effect on the surgeof course, I also think I'd better get a new inlet manifold sharpish too as we know they are restrictive.