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Hi Peter
Yes, there are different meanings about how to choose the number of the PV. That's why I am not 100% fit on this part. But will be shown on tests.
My 4.5 seam to be good for my vacuum, but at 1mm gas pedal the PV is not active. The vac is over 10inHg. So it has no effect, also it works in the main circuit. Only when the vac drops down, by pushing the pedal to the metal the PV opens and adds additional fuel to main circuit.
Regards
Richard
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THX, FFR 427 MKIII.1
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