Why do Turbocharged cars make a ';psshh'; sound every time they change gears?

Every time I see a car with a turbo changing gears, I hear this PSHHH type of sound. I'm trying to learn about cars, so I'm wondering how come all the turbo cars make this sound?



Also, is it true that if you buy a certain muffler for it, that sound will go away?Why do Turbocharged cars make a ';psshh'; sound every time they change gears?
Its the blow off valve that makes the sneezing sound when the boost is released so the revs can drop to change gears.

but it can be routed to the exhaust and then you don't get the stupid sound.Why do Turbocharged cars make a ';psshh'; sound every time they change gears?
It is from the turbocharger waste gate releasing pressure on the intake manifold.



Without this pressure relief the engine would continue to rev during gear changes. This would result in harsh shifts and transmission damage with an automatic transmission. It would result in engine damage from over revving with a manual transmission.



You may be able to quiet it some with a muffler. However turbo mufflers are usually lower restriction giving the exhaust less back pressure. This lower restriction makes the muffler louder. You want a low restriction exhaust with a turbocharger because it is the exhaust gasses that spin the turbocharger to make the boost. A turbocharger system that is restricted and makes no boost is a pointless waste of money.
That is the waste gate or a pressure valve, turbo chargers build air pressure packing %26gt;%26gt; 3 L of air into a 2.5L %26lt;%26lt; engine at 3.1 L the waste gate opens and dumps the excess air out.

Not muffler can prevent this as the waste gate is before the muffler.
compressed air is being released from a valve.