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flightlead404 flightlead404 is offline
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Join Date: May 2015
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Quote:
Originally Posted by spuggy View Post
Diagram is correct, IMO.

If you're using the common 35-series (3 port) MAC valve, port 1 is normally-closed, port 2 is normally open (vented to atmo via port 3).

If you've got some other variant, you're on your own - but the diagram is consistent with a MAC solenoid.

Connect the intercooler/throttle body etc to the side port of the Tial and port 2 to the top.

Until the controller switches on, all the boost goes to the side/bottom of the wastegate, and you're running on just the spring.

As the solenoid activates/duty cycle goes up, it adds boost on top of the diaphragm, increasing resistance above the spring rate.

NASIOC guys say to leave the brass "muffler" out of port 3, BTW.
So higher duty cycle = higher boost? Glad I caught that as I assumed it was the other way around.
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Old 07-19-2019, 10:13 AM
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