Boost Solenoid Question

[moose]

What exactly does the solenoid or switch that is hooked up to the turbo do? Does it control boost by vaccum somehow or does it somehow raise or lower the timing through the computer? And, How does it work?

 

[Greyling]

From my understanding it is pulsed by the ECM to leak air from the vacuum going to the wastegate actuator to control boost. The open nipple,...if plugged will limit your boost to the spring tension on the actuator.

 

[moose]

Makes sense to me. Mine is currantly plugged, Should it be unplugged for the chip to be able to actually control the boost?

 

[1KWIK6]

The solenoid 'bleeds off' pressure that would otherwise open the wastegate. This allows the boost to run higher than the spring rating.
Without the solenoid, the wastegate would open at whatever pressure the spring in the actuator was rated at.

 

[moose]

I have an unknown chip in my car and the turbo had a vaccum line running from the turbo housing directly to the actuator, I put everything back like it was supposed to be today and I wandered if maybe I could tell a little about the chip by hooking up the solenoid like it was supposed to be in the first place. With the solenoid hooked up right should I be able to tell how much boost the chip was set for as long as the nipple on the end of the solenoid is left open to bleed off the vaccum? All I know about the chip is it has STAGE I wrote on it.

 

[moose]

Anyone there?

 

[gnturbo]

I had so many flucuations in boost that I unplugged the rascal and put one of those little boost controllers on,Now It appears to be quicker spool and better control of boost up to 22 psi where my actuator does what it wants then ,I dunno.