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The boost control solenoid is modulated by the ECU to bleed the pressure signal going to the wastegate in order to control the opening of the wastegate
and oil consumption yet strength enough to support big power levels and motorsport type operating conditions
the equivalent single spring application
Must use shimless buckets
EJ22 / EJ18 / EJ25 MY90-96
STI High Pressure Radiator Cap 11815AB213 The boost control solenoid isCOOL UNDER PRESSURE The STI high pressure radiator cap helps keep the coolant within the engine under extreme driving conditions. This cap increases maximum system pressure from 108kPa (15. 7psi) to 130kPa (18. 9psi) to ensure that the system will not overflow under conditions of increased coolant thermal expansion. Higher system pressure also increases the coolant boiling point. Please ensure all hoses and clamps are in excellent condition before
