Can someone explain how the above boost control setup would work. The valve on the left uses a vac source applied to the top of the diaphram which would effectively help hold the spring closed at high boost levels providing high boost than a single valve setup would. I assume this would be used to give a large boost control range (similar to a CO2 boost controller). Is this correct?

I'm not sure what the D port on the actuator does though, I assume that D and E are both connected and would both work against the spring opening it?

What control circuit would be required to drive the two valves. Would you need a split range controller with two different duty curves, or could you run them from a single controller with a single curve, eg run the two valves from a single PWM output?

  • $\begingroup$ Cross posted here: mechanics.stackexchange.com/q/69632/10976 $\endgroup$
    – Solar Mike
    Aug 16 '19 at 4:09
  • $\begingroup$ Yeah I re-posted it here as it is more suited to engineering. $\endgroup$
    – rollsch
    Aug 16 '19 at 5:22
  • $\begingroup$ Important info on the cross post is that the car is a skoda 1.9 ... $\endgroup$
    – Solar Mike
    Aug 16 '19 at 5:59
  • $\begingroup$ Mike do you reply to every single post on this stack exchange? $\endgroup$
    – rollsch
    Aug 16 '19 at 8:26
  • $\begingroup$ No, do you post on every one? $\endgroup$
    – Solar Mike
    Aug 16 '19 at 8:28

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