![]() It controls boost and spool up rate, one port for vacuum supply, the other two for max boost and spool up rate, if you want to call it that. The vacuum solenoid on the patrols is a two stage set up, three ports. Originally it was between the control solenoid and turbo. Would this be any different to the older style Dawes valve as the instructions say to just bypass the solenoid.Īlso, where should the dampener be placed? Between the turbo and valve (currently set this way) or the valve and vacuum pump? Or does it not matter? Here is a link to an earlier version of the HPD Boost controller. The question I have is that most of the diagrams I see still keep the factory vacuum solenoid or use a needle valve so are these rally needed? On my car its just the Dawes valve connected between the vacuum pump and turbo. ![]() Around town its 10-12psi or lower when not under load. ![]() It would spike up to 16-17psi and then settle down to 14psi on the highway. I drove it around town as well on the open road (110 km) and boost was linear. This seems to be working fine on the patrol. Two separate suppliers advised that I just isolate the solenoid and hook up the Dawes valve directly to the vacuum pump and then to the turbo. I have just installed a HPD Dawes valve to my CRD Patrol to stop the over boosting caused by the new 3 inch exhaust.
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