guyz Posted April 22, 2019 Share Posted April 22, 2019 TRADER FEEDBACK 0 0 0 TOTAL RATING N/A Members 0 4 posts Locationvancouver bc Report post Posted 6 hours ago Based on old but positive posts on here, I recently bought a HDI electronic boost controller (type D) and am ready to install it. Seems great but I'm not super impressed with the instructional clarity regarding running the pressure lines to/from the solenoid. I'm running an external wastegate and it's clear and obvious that the pressure signal from my compressor outlet goes to port P on the solenoid. Port A then goes to the wastegate and it seems to make sense that it should go to the chamber below the diaphragm and spring, solenoid sends pressure signal at set boost ceiling and the wastegate is opened, thereby doing its job. The waters are cloudy for me when I go to the expanded schematic on page 9 of the online install manual (www.hdimenu.com) where it shows the solenoid output (port A) going to the upper chamber of the wastegate (spring side). They then show a line connected from the WG lower chamber, below the spring/diaphragm that is being fed by manifold pressure. What that means to me is that when boosting there is essentially an equilibrium of pressures coming at the diaphragm from either side. As I write this it is starting to make sense to me that once the solenoid is triggered by the preset within the controller, it opens and the pressure that is pushing against the top side of the diaphragm and holding the WG closed, then bleeds off via the open and unused solenoid port R, and the WG will then be free to open because of the manifold pressure being exerted against the single, low side of the WG diaphragm chamber. If I've got this correct then some validation from those more experienced here will allow me to carry on accordingly. Thanks in advance Quote Link to comment Share on other sites More sharing options...
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