Watch your boost gauge. the turbo spins, yes.
Thing to know. Turbo's don't work off of pressure in the exhaust.
They work off of heat. It's the heat energy in exhaust that makes the turbine spin.
That's why we hate superchargers.
If turbos worked off of exhaust pressure, they would have to be positive displacement turbines, which would rob mad power like the old muscle head guys think turbos do. Like superchargers do. Also, 5000 rpm would spool a turbo no matter what, hell idle would spool a turbo no matter what.
When the EGTs are low, exhaust gasses have very little energy to give to the turbine, and it doesn't spin with enough energy to produce boost, because it just slips between the turbine blades. Oh you can get a little puff from the valve, but without a two step putting load on the engine, and increasing egts, you won't hear a 10 psi bov sound in neutral.
It's the temp difference that makes the energy to spool a turbo. That's why we coat things to keep heat in the exhaust manifold and hot side of the turbo. It's not because we gain 3.7 hp by lowering underhood temps, it increases spool time because that heat isn't warming our airfilter, it's spinning our turbines.
