The opening of the diverter valve via vacuum sucks charge air. The excess charge air is blown out via a hose, which leads to a hissing noise. If the diverter valve is broken, the turbocharger makes a noticeable noise and that Pop-off valve flutters. In this case, the excess charge air is drained through the turbocharger. This is not healthy for the engine. The air pressure moving in the other direction, which is returned through the turbo inlet, creates a condition called turbo fluttering. The paddle wheel is rotated in a different direction during turbo fluttering or turbo flutter. Of course, it has to be slowed down first. Braking the paddle wheel generates the typical “fluttering” noises. Braking puts extreme stress on the bearings. The bearings cannot withstand the heavy loads for long and break prematurely. That means the end for the turbocharger.
What is the so-called turbo flapping?
When there is excess pressurized air in the turbocharger system, turbo flapping occurs, which is also called compressor surge. If the engine is unable to burn the entire amount of air that comes through the turbocharger, the excess air is built up in the intercooler. When the pressure in the intercooler increases with the pressure in the turbocharger, the air is forced back through the turbocharger inlet. The paddle wheel of the turbocharger is braked and moved in the other direction. Even with oversized turbochargers may cause a turbo flutter, since the engine is not able to burn the entire amount of air at low speeds.
Blow off valves
Here you should first know what a blow-off valve is. It is currently a very much desired tuning part. But many have only half knowledge about it. But what does the blow-off valve really do and what exactly does it do? What variations are there and what are pros and cons.
For one thing, there are closed systems. The blow-off valve directs the boost pressure of the turbocharger, which arises when leaving the gas pedal and the throttle valve wants to back into the intake. Here it does not come to the typical hiss. The hissing occurs only with open blow-off valves, as they let out the boost pressure. With the closed blow-off valve, the measured values of the air mass meter are not distorted. It's different when it's open Blow off valveSince this leaves the air out, the lambda sensors measure lower values. As a result, the idle speed is increased. The idle controller then tries to lower the idle speed again. And it creates again negative pressure. This circle keeps repeating itself. An alternative to producing the coveted hissing sound is to make it over an open suction. Or you increase the preload of the spring of the piston, then there is enough force there to keep that open blow-off valve closed even at idle speed.
Popular noise with big disadvantages
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