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Old 11-30-2014, 12:26 PM   #1
Scooby Newbie
Member#: 341649
Join Date: Dec 2012
Default Boost controller fail safe question

So, i'm thinking to use the a relay to fly my wastegate open via the 3 port boost controller.

The question is, in the unenergized state, does it allow full boost to reach the wastegate or is it the other way around?

I'm thinking to cut power to the boost controller to let it run wastegate pressures
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Old 12-01-2014, 01:54 AM   #2
Scooby Specialist
Member#: 105104
Join Date: Jan 2006
Chapter/Region: VIC
Location: Coquitlam, BC, Canada
1979 BRAT / 01 RSTI
99 2.5TS (DEAD) / 87 GL


If you have it set up correctly yes, cutting power to it will allow you to run wastegate pressure.

If you look at the diagram on the side of the valve you'll see the numbers 1,2,3. These correspond to the port numbers on the valve. The two little boxes on the top designate that it is a solenoid actuated valve and the little squiggly thing on the bottom designates that it is a spring return.

So then there is the two boxes with arrows in them. The lower box is showing the unenergized state. As you can see, the flow is connecting port 2 to 3 and port 1 is blocked.

Then when it is energized, the top block is used. Keeping the labels in the same spot, it shows that now port 1 and 2 are connected, and port 3 is blocked.

So in an unenergized state, port 2 and 3 are connected, then you are just running on spring pressure. When it is energized, port 3 is blocked and therefore no pressure is getting to the wastegate to open it.

If you were to unplug or remove power from the solenoid, your car would only see spring pressure. Some solenoids are different so it's best to look at yours and confirm the operation. You can even just blow into different ports and see which ones are blocked/unblocked and then energize and repeat.
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Old 12-01-2014, 04:44 PM   #3
Scooby Newbie
Member#: 341649
Join Date: Dec 2012

Gotcha. Will work as i thought then
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