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Summary of change:
== Ports == Com - "common" port that can be switched to pass air from NO or NC NO - normally open port. When the solenoid is OFF, air passes from Com to NO (or the other way - it's not a diode ;) ) NC - normally closed port. When the solenoid is ON, air passes from Com to NC http://vems.hu/www.vems.co.uk/VEMSUserManual/BoostValve.png == Port connections == Com is connected to the boost source (ie the inlet manifold) NO is connected to the actuator NC is connected to fresh air (in a MAP/AlphaN car. MAF is slightly different...) == Yet to be re-edited == You then have a duty cycle table (TPS against RPM) and this is used to stop the actuator "seeing" pressure. When you want to build boost fast, the duty cycle approaches 100%. The "sense" of this changes slightly for an external wastegate as these have a 2 port actuator - one for "open" and one for "hold closed". I will throw some diagrams together if you like... [dnb] --- More info about boostcontrol, even plumbing diagrams, look at the the following page: BoostController - DB
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