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Schematic overview and setpoint values

The blow-off valve dissipates unwanted charging pressure peaks that can occur when the throttle valve is closed.

Fig 1: Compressor Valve Operation Diagram
G09908139Courtesy of BMW OF NORTH AMERICA, INC.
Index Explanation
1 Compressor bypass valve closed
2 Compressor bypass valve open

Observe the following setpoint values for the blow-off valve:

Size Value
Voltage range 8 to 16 V
Response time at 20 C and 13 V ≤ 40 ms
Power consumption at 25 C and 13 V approx. 1 A
Temperature range -40 °C to 140 °C
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