If you want to increase horsepower, you’ve probably heard of a turbocharger recirculation or bypass valve. These valves allow boost pressure to flow back into the airbox or somewhere else in the intake system. These valves are commonly used in OEM applications, like Turbonetics systems. Bypass valves provide a different level of performance than high-end systems.
Variable flow compressor recirculation valve
A variable flow compressor recirculation valve (VFCRV) is a device used to regulate the discharged flow in compressors. It allows the discharged flow to be quickly recirculated back into the compressor. The VFCRV calibrates the discharge flow to the pressure loss in the orifice or venturi.
The valve includes a piston and housing. The piston connects to a primary valve that opens and closes fluid communication between the inlet and discharge ports. The CRV can also have a control port valve that opens and closes to regulate the flow in the engine.
The CRV helps minimize the surge in the compressor. A CRV can reduce the rise by recirculating the compressed air back to the inlet. However, it may cause a poor response during transient conditions and inadequate boost to meet torque requirements. Therefore, this valve should be operated carefully to avoid any negative consequences.
A variable flow compressor recirculation valve is often used with turbocharging to allow smaller displacement engines to operate. While turbocharging can lead to fuel economy gains, it also degrades the compressor’s performance. The VFCR also allows a compressor to work close to a surge boundary while avoiding the surge. The variable flow recirculation valve also allows the engine to get a boost at the right time for current power demands.
Variable flow compressor recirculation valve should be sized appropriately, as a compressor will typically initially operate at full open. Choosing the correct valve size will ensure a smooth start and operation.
Diverter valve
Your vehicle’s turbocharger has a diverter valve located in the compressor housing. While this valve is not the same as the blow-off valve, it is similar and prevents unused pressure from escaping back into the system. This prevents compressor surge, keeps the wheel moving, and reduces turbo lag. Earlier models of turbochargers had diaphragm-style valves that would rip when you cranked up the tune.
Diverter valves come in two types: mechanical and electromechanical. An automatic valve in the intake manifold features a spring-loaded valve that closes off the charge piping to the atmosphere. An electromechanical valve operates with a 12v solenoid and is controlled by the vehicle’s ECU. The EcoBoost ECU includes a BPV Mode monitor that controls the valve’s function.
Regarding turbocharger recirculation, diverter valves are the best option for vehicles with mild turbo upgrades. These valves recycle waste fuel, while blow-off valves are more appropriate for vehicles with significant turbo upgrades. Blow-off valves may lead to running rich or sluggish.
Bypass valves work on the same principle as a VTA valve. They release pressure back into the intake system when the throttle is closed. This helps prevent the loss of metered air into the atmosphere. It also prevents boost creep, the condition where there is too much boost pressure in the engine.
Forge recirculation valve
A recirculation valve recirculates air to the turbocharger, improving the turbocharger’s response and boosting pressure. A recirculation valve is a superior option for those looking to increase boost pressure and improve performance without affecting the car’s fuel efficiency. This valve comes with all the necessary fittings and includes a replacement solenoid. The valve is also easily tuneable with replacement springs.
Dayco compressor recirculation valve
The Dayco compressor recirculation valve allows engineers to precisely control boost pressure and prevent surges within the turbocharger’s operating range. This valve helps reduce turbo lag and reduce fuel consumption. Today, fuel efficiency and carbon emissions are significant concerns for the automotive industry. Developing an efficient valve is a crucial step toward achieving these goals.
The Dayco CRV 12 includes a first aspirator 14, a vacuum reservoir 16, a vacuum limiting valve 18, and a gate valve. The valve also has a control chamber, which communicates with the actuator portion of the gate valve 19. As the compressor exhausts air, the pressure in the control chamber of the CRV 12 acts on the valve portion to move the valve into the closed position. The valve remains in this position until the pressure is released or overcome.
The Dayco ACTIVAC will be used on Ford’s F-150 pickups until the end of the year. Initially, the company will focus on the brake system, but it hopes to expand its use to other vehicles, engines, and procedures. Dayco plans to continue this project in other automotive sectors, and the company has six other projects for other vehicle systems.
The Dayco compressor recirculation valve has a pressure-controlled chamber and a seal to prevent backflow. A valve’s actuator controls the valve’s opening and closing by moving a gate member. The gate member is positioned within an annular recess on the valve body 100. This valve may also include a biasing element.
