Wastegates and Blow Off Valves | Garrett - Advancing Motion
Using the proper blow off valve (BOV) affects the system performance. There are two main types to consider.
MAP (Manifold Absolute Pressure) sensor uses either a vent to atmosphere valve or a recirculation valve.
– Connect signal line to manifold source
– Surge can occur if spring rate is too stiff
MAF (Mass Air Flow) sensor uses a recirculation (bypass) valve for best drivability.
– Connect signal line to manifold source
– Position valve close to the turbo outlet for best performance (if valve can handle high temp).
– Surge can occur if valve and/or outlet plumbing are restrictive.
Internal wastegates are part of the turbo and integrated into the turbine housing. Two connection possibilities exist for signal line. The first is to connect line from compressor outlet (not manifold – vacuum) to the actuator. The second is to connect a line from compressor outlet to boost controller (PWM valve) and then to the actuator. Manifold pressure is limited by the spring rate of the actuator. Most OEM style actuators are not designed for vacuum, and thus, the diaphragm can be damaged resulting in excessive manifold pressure and engine damage.
External wastegates are separate from the turbo and integrated into the exhaust manifold rather than the turbine housing. Connection to the manifold greatly affects flow capability, and correct orientation of the wastegate to the manifold is essential. For example, placing the wastegate at 90° to the manifold will reduce flow capacity by up to 50%! This greatly reduces the control that you have over the system and puts your entire drivetrain at risk. Instead, the ideal connection is at 45° with a smooth transition.
There are two connection possibilities for signal line to an external wastegate:
• Connect a line from the compressor outlet (not manifold – vacuum) to the actuator
• Connect a line from the compressor outlet to a boost controller (PWM valve) and then to the actuator. Again, manifold pressure is limited by spring rate of actuator.
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