How does boost pressure control work on a Saab?
Boost Pressure Control (BPC) is how the engine ecu controls and limits turbo boost. Same function as APC on older Saabs, but performed directly by the ecu. With no boost pressure control, boost would be regulated by the spring inside the waste gate actuator. It would only reach 0.4 bar, or about 6 psi. This is also called “base” boost.
Can a pressure control valve be removed from a Saab?
The valve can be removed after unplugging the electrical connector, and removing two torx head screws. The screws are held by rubber bushings with metal inserts. If the screws do not come out easily, it may be necessary to remove the headlight and push them out from behind.
Where is the boost pressure control valve located?
The valve is normally open from the compressor to the waste gate, and closed to the intake. Above 0.4 bar, the ecu cycles the BPC solenoid to open the valve to the intake and bleed off some of the boost air from the waste gate actuator, which allows the waste gate to open at a higher pressure.
Where is the pressure valve on a turbo?
Turbo compressor, which is the source of air pressure, waste gate actuator, which is operated by the air pressure, and the air intake which is used to bleed off air above base boost. The valve is normally open from the compressor to the waste gate, and closed to the intake.
Boost Pressure Control (BPC) is how the engine ecu controls and limits turbo boost. Same function as APC on older Saabs, but performed directly by the ecu. With no boost pressure control, boost would be regulated by the spring inside the waste gate actuator. It would only reach 0.4 bar, or about 6 psi. This is also called “base” boost.
The valve can be removed after unplugging the electrical connector, and removing two torx head screws. The screws are held by rubber bushings with metal inserts. If the screws do not come out easily, it may be necessary to remove the headlight and push them out from behind.
The valve is normally open from the compressor to the waste gate, and closed to the intake. Above 0.4 bar, the ecu cycles the BPC solenoid to open the valve to the intake and bleed off some of the boost air from the waste gate actuator, which allows the waste gate to open at a higher pressure.
Turbo compressor, which is the source of air pressure, waste gate actuator, which is operated by the air pressure, and the air intake which is used to bleed off air above base boost. The valve is normally open from the compressor to the waste gate, and closed to the intake.