When a modified car speeding off from the side, we often hear ldquo; buzzing hellip; hellip; rdquo; after a period of engine acceleration sound, then came ldquo; bared hellip; hellip; rdquo; the I heard mdash; mdash; it gives people a sense of momentum transfer full. This is where the sound is coming from? Why did not this sound on ordinary civilian car, or some high-performance sports cars (and some ordinary modified car there)?
In fact, this unique ldquo; ci hellip; hellip; rdquo; acoustic sound pressure relief valve turbocharged engine when the relief issued, it can be said that all will have a turbocharged engine the sound, but for everyday civilian car manufacturers in the design will be handled as a noise that sounds, it will be as low as possible. Approach is to vent the pressure within the intake manifold, so the noise is small mdash; mdash; This method is called internally drained relief.
to those of ordinary civilian vehicle turbocharged engine assembly, generally do not listen to undetectable relief when there ldquo; ci ci rdquo; sound. This is like for ordinary civilian car, engine noise and exhaust rumbling sound that belongs to the Side (and sometimes high-performance car can emphasize the sound), the sound will eliminate as much as possible the original design. And for those who like driving pleasure of the riders, the sound have become a catalyst to stimulate their driving passion (we often see a lot of car exhaust pipe is like a barrel change in general, the sound rumbling loudly).
In addition to the excitation driving passion, ldquo; dazzle rdquo; one of the demands is modified, a lot of people want to change their car like ultra-high-performance car, even if the car is not particularly strong momentum. Generally, turbocharged engine emitted ldquo; ci, ci rdquo; sound associated with the size of the boost strength mdash; mdash; large turbocharger easier to issue such a sound. So if this sounds relatively large, this car can seem larger turbocharger, people have a shining feeling.
Many fans also modified for this purpose, their own civilian vehicle engine (such as Bora 1.8T, Passat 1.8T) is internally drained ventPressure leak into the formula, and further increase ldquo; bared rdquo; sound reasons as barrel-type exhaust duct is very similar. Why, then, turbocharged engine will be issued such a voice it?
When we accelerator pedal is depressed to accelerate, throttle opening, the engine exhaust temperature and high pressure exhaust energy of the exhaust gas turbine driven to rotate, when the speed reaches the turbocharger when the working (i.e. the turbine rotation per minute when 100,000 rpm or more), before the turbocharger compresses ambient air, increasing the engine intake air amount, to enhance the engine power.
“HKS efflux relief valve”
When we in the skimmer, the opening degree of the throttle valve is closed rapidly decreases until an idling state , that is to say the engine does not require the air intake, or intake pipe flow at the throttle valve will be blocked. But at this moment the turbocharger and did not stop working! Because of inertia, the turbocharger speed remains at 100,000 revolutions per minute continues spinning. Now imagine, at this time still continues to be a steady stream of air compressed into the intake manifold, if this part of the high pressure air can not be discharged in time in the intake manifold, the intake pipe will rapidly increase in pressure may cause festival valve damage or intake pipe burst.
“pressure relief valve installed in the intake pipe”
In this case, it is necessary to install in the intake duct in a pressure relief device, to unload off the excess pressure air conduit from the intake of the turbine compressed. In fact, the pressure relief valve is a valve mounted on the inlet pipe, for controlling the supercharging pressure. Closing the relief valve is controlled by an ECU (Electronic Control Unit) solenoid operated. The ECU will be made of low-pressure turbine outlet charge is determined, as soon as the pressure exceeds a critical value, the electromagnetic coil will be turned on or off control, to open or close the relief valve.
When the relief valve is closed to ensure that sufficient feed intake pressure based intratracheal, when the valve is open can vent excess gas to the atmosphere, reducing the intake manifold pressure, engine intake duct protection . So we hear modified car ldquo; bared, bared rdquo; sound is the sound pressure relief valve in the exhaust of relief.
ldquo
In fact, given the car modification; Bared, bared rdquo; sound for enhancing engine performance makes no sense, but can render a great boost the value of illusion. Relatively speaking, the greater the boost value of the engine, which exhaust air relief valve relief the more, the greater the noise generated theoretically. The modified car when the pressure relief valve relief when the sound is amplified, like using a large barrel exhaust pipe as mdash; mdash; movement is cool, but little practical effect.