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Isnt the frequency valve like an electronic fuel injector. To control FD head pressure I have to change pressure resistence on ram movement--as you say low pressure easier movement more gas....so the Frequency valve bleeds off pressure as it relates to a pulse width as controlled by the ecu value intrepreted from the lambda output voltage. NO gas is introduced into the intake by frquency valve then is what you are saying.
If it were like a electronic fuel injector this orifice opening, if it is aligned with the constant pressure modification on the fuel head, would bleed pressure and enrich by increasing volume of gas flow.
Am I there?
Also you have an older 930 by the looks of your BOV plenum.. I see the over boost pressure switch next to the spring housing and the red rubber boot turbo pressure dash sending unit.. what is the function of the large vacum diaphram next to the boost sending unit?
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1987 930 -Guards Red
2001 740I sport Blk
2011 F-150 supercrew Blk
2014 X3 2.8 white
"What goes around comes around..."
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