When we depress the accelerator pedal to accelerate when the throttle is opened, the engine will send issued "Well ......" sound with the enhancement of speed, engine exhaust temperature and high pressure exhaust energy driven rotation of the turbine exhaust gas, when it reaches the turbocharger rotational speed (that is, when the turbine rotating at 100,000 rpm or more per minute), before the turbocharger compresses the air around the engine intake air increases, improve engine power.
When we collect oil in the throttle opening is closed decreases rapidly until the idle state, that does not require the intake of the engine, or the air intake pipe will be blocked at the throttle valve. But at this moment the turbocharger does not stop working! Due to the inertia of the turbocharger rotational speed remains at 100,000 revolutions per minute or more to continue spinning. Now imagine, at this time continues to be compressed air streaming into the intake manifold, Peugeot 206 turbo if this part of the high-pressure air can not be discharged in a timely manner in the intake manifold, intake manifold pressure will make rapid rise may cause Festival valve damage or intake pipe burst.
At this point, we need in the intake duct installation of a pressure relief device to remove the pipe from the intake of excess high-pressure turbo compressed air. In fact the pressure relief valve is a valve installed on the intake pipe for controlling the supercharging pressure. Opening and closing of the relief valve is controlled by the ECU (electronic control unit) operated solenoid. ECU will be based on high and low pressure turbine outlet supercharged to make judgments, once the pressure exceeds a critical value, Peugeot 407 turbo will be on the electromagnetic coil is energized or de-energized control to open or close the relief valve.
When the pressure relief valve is closed to ensure that there is sufficient intake pipe inlet pressure as the basis, when the valve is open can vent excess gas into the atmosphere, reducing the pressure inside the inlet to protect the engine air intake pipe. So we hear the modified car "ci, ci" sound is relief at the sound of the exhaust pressure relief valve.Peugeot 307 turbo
In fact, the "ci, ci" sound emitted by the car modified for enhancing engine performance does not make any sense, but can boost the value of rendering a great illusion. Relatively speaking, the larger the engine boost the value of this pressure relief valve pressure relief exhaust air the more, the greater the noise generated theoretically. The modified car, the pressure relief valve relief when the sound is amplified, just like the exhaust pipe using a large barrel - the movement is cool, but there is no practical effect.
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