Originally Posted by
AquariousRS
Chip from those graphs, How much do you think the presure ratio will corespond with boost presure? Is it likely that 2 on the graph scale will still be equal to 1bar atmospheric?
Pressure ratio means its based on whatever pressure you have at the inlet side of the turbo, with a decent inlet filter and in a low country like england thats going to be very close to atmospheric yes mate.
So the 2 there is essentially 1 bar of boost, and the 4 is 3 bar of boost.