Boost pressure control valve for different automobiles
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Your Pressure converter (turbo control valve) worn out? » Read more about common malfunctions • Repair • Replacement manual
Control intake air control with the pressure transducer The pressure transducer, also sometimes referred to as boost pressure control valve, is a component of turbocharged engines. The valve controls the air volume supplied to the engine. This optimizes combustion and prevent the engine from taking damage. There are two designs of pressure transducers. Pressure transducer function with a turbocharger The pressure transducer can be used as a pure component to protect turbocharger and engine, or actively for the engine management system. With exception of regulation, both boost pressure control valves function in a similar manner. The more exhaust gases are expelled, the more air a turbocharger boosts into the system. Thus, without regulation, an engine equipped with a turbocharger would continuously rock itself into ever higher speeds. Sooner or later, this will first result in destruction of the turbocharger. Later on, the engine itself may also be damaged as a result of overspeed. The pressure transducer prevents this by diverting part of the air flow via a bypass valve in the exhaust stream once a certain boost is achieved. Since the drive wheel and the turbocharger's turbine wheel are interconnected by means of a rigid shaft, the speed of the turbocharger decreases when exhaust gas pressure is diverted. Consequently, less air is taken on the suction side and the boost pressure decreases. If the boost pressure control valve is used to protect the engine and turbocharger, it is controlled by a rubber diaphragm. It is entirely controlled manually by the external pressure of the atmosphere. This type of boost pressure valve is also called "Wastegate". If the boost pressure valve is to be actively involved in engine control, it must be moved electronically. The characteristic values of the electronic boost pressure control valve are the measured boost pressure, the position of the throttle valve and the knocking tendency. In addition, the temperature of the intake air, the temperature of the engine, the current speed and the ambient pressure are important for the calculation of the boost pressure as corrective signals. The pressure transducer is precisely controlled via an electronically controlled stroke valve. This allows an engine with program-controlled management to always reach an optimum combustion via the control unit by means of the electronic boost pressure control valve in combination with the fuel injectors. This minimizes consumption and maximizes available performance. In any case, both systems are always also equipped with an additional blow-off valve, which drains the boost pressure in the case of a massive exceeding of the speed. Boost pressure control valve defects If the electronic boost pressure valve is faulty, the signals sent by the control unit are no longer correctly implemented. A common cause of this is a hardened membrane, which can be replaced under certain circumstances. Pressure transducers are especially sensitive to contamination resulting from missing air filters, leaks in the air system or charring in the exhaust gas. This may arise from penetration of oil into the turbocharger. Electronic boost pressure control valves feature complicated inner mechanics of worm gears made of plastic. If the control rod of this valve is stuck, this transmission may actually become disassembled. There are also special workshops, which can repair the component under certain circumstances. Typically, however, a replacement is the only option in the event of failure of a pressure transducer. Pressure transducer repair Fortunately, Repairing a boost pressure control valve is quite simple. It is easily accessible on most vehicles and repair merely requires replacing it. Under some circumstances, it may also have to be programmed to work with the existing controller, but this can be quickly performed by a specialist with appropriate hardware and software. The most important aspect of repairing the boost pressure control valve is to eliminate the cause of the failure. Of course, these very complex components can simply fail from age. But oftentimes, a defect in the intake or turbo system is responsible for the pressure transducer's failure. If oil drips into the air hose, the turbocharger whistles loudly and looks very charred or any other obvious error occurs, it must be fixed. Otherwise, even the highest-quality boost pressure control valve won't last very long. Brand-quality pressure transducers for maximum service life Boost pressure control valves are in fact quite long-lasting components. One may expect the first intake passage failures in vehicles about 5-8 years in age or with a mileage of 120,000 km. Firstly, these relate to the hoses and seals. If such damages are fixed quickly and conscientiously, the boost pressure control valves also last longer. However, should its replacement become necessary, you should make sure to go for brand quality. You can acquire a reliable refurbished air duct at a reasonable price. Brand parts cost anywhere from 30 to about 80 euro.