Cars turbocharged engine principle relief valve relief

Modified cars unique "ci ......" sound is the sound pressure relief valve turbocharged engine emitted when relief can be said that all the turbocharged engine will produce this sound, but for everyday civilian vehicles and words, the manufacturers would this sound as noise to deal with in the design, to reduce it as much as possible. Approach is to vent the pressure within the intake manifold, so very little noise - this relief method is called internally drained.
HKS efflux relief valve
For turbocharged engine assembly ordinary civilian cars are concerned, do not listen are generally unable to perceive the "bared bared" sound when relief. This is like for ordinary civilian car,Peugeot 308 turbo engine noise and exhaust rumbling sound is part of a negative argument (and high-performance cars and sometimes you can emphasize that this sounds), the original design as possible to eliminate this kind of sound. And for those who like driving pleasure riders, the sound will become a catalyst to stimulate his driving passion (which we often see a lot of car exhaust pipe is like a barrel change in general, the sound rumbling loudly).
Pressure relief valve installed in the intake pipe
In addition to the excitation driving passion, one of the "flip" is also modified demands, many people want to change their car like ultra-high performance car, even if the car is not particularly strong momentum. In general, the turbocharged engine is the size of the "ci, ci" sound associated with the supercharged strength - large turbocharger easier to issue such a voice. So if this sounds relatively large, this car can seem larger turbocharger, people have a shining feel.
Many modification enthusiasts but also for this purpose, Volvo S40 turbo his own civilian vehicle engine (such as Bora 1.8T, Passat [Review Photo Forum] 1.8T) within the pressure relief vent leaked into a formula,Volvo V50 turbo and further increase the "ci" sound , the truth and the barrel-type exhaust pipe is very similar.

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