what makes a turbo spool? is it the intake that makes the spool sound?
It's the turbocharger gaining RPM that causes the spool sound (turbochargers operate in RPM ranges up to 170,000+ RPM).
exhaust gas makes the turbo spool
I guess technically the turbocharger makes that classic spool sound when it's at steady state as well, so the sound is due to the incredibly high RPM at which a turbocharger operates.
i honestly dont think he is asking about the sound. also, not all turbos
operate at 170,000+ rpm's. another reason why some turbos make a whirring
sound is the type of bearings they use.
and yes, it's the exhaust that spools turbos up.......
I am aware of that, I intended that to say some turbochargers operate at RPM ranges up to 170,000+ rpm. Most of the larger turbos people use do not actually spin that high.