Boost solenoid question
02 September 2005, 08:07 AM
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I am not sure how much detail you are looking for but the solenoid is what controls the internal wastegate and thus how much boost you make. I dont think there will be any difference between yours and a newer one.
Here is an explanation I got from a mate of mine.
Both the WG solenoid and spring work together to close the WG and hence allow inital boost to build up. Once boost is around 0.6-0.8Bar a diaphragm actuater pushes against the WG spring and without a solneoid would quickly open to release all excess exhaust gases - hence limiting boost near this value. However your ECU kicks in beforehand and activiates the solenoid to keep the WG closed again (by gradually increasing WG duty cycle) and thus allowing boost to grow beyond 0.8Bar. In otherwords the diaphragm pushes/balances against the WG spring and solenoid.
Here is an explanation I got from a mate of mine.
Both the WG solenoid and spring work together to close the WG and hence allow inital boost to build up. Once boost is around 0.6-0.8Bar a diaphragm actuater pushes against the WG spring and without a solneoid would quickly open to release all excess exhaust gases - hence limiting boost near this value. However your ECU kicks in beforehand and activiates the solenoid to keep the WG closed again (by gradually increasing WG duty cycle) and thus allowing boost to grow beyond 0.8Bar. In otherwords the diaphragm pushes/balances against the WG spring and solenoid.
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