Originally Posted by
AquariousRS
So its just transfering cold, pressurised air from the inlet into the exhaust manifold to keep the turbo spinning when the engine cant consume the full amount of air being supplied?
Yes, and extra fuel is being injected to continue burning in the manifold to spool the turbo. This makes the turbo spin more or less on its own if wanted undependent of the engine load. This kind of makes the turbo a bit like a jet engine. Turbos have been converted to jet engines time and time again. Not that different in the end.