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...if you disconnect the "W" hose from the solenoid, you should have as much boost as the turbo can produce.... unlimited boost... until your engine blows up.
by disconnecting the "w" hose from the solenoid, you are removing the air-pressure that starts at the compressor housing, is fed through the solenoid, and enters the wastegate actuator...
basically, the wastegate actuator is BLOWN open by pressure from your turbo... and... thus... by disconnecting the "w" hose...
no pressure should be reaching the wastegate actuator... and furthermore that means the wastegate should be completely shut, if the rod is adjusted correctly.
So...
this means your wastegate actuator is either broken somehow, or mal-adjusted....
...or the wastegate flap itself is stuck open internally.
That is your number 1 suspect right now, and unfortunately a little difficult to get at.
try getting at the turbo unit on your car, finding the wastegate actuator rod, and pulling the small pin from the end of the wastegate rod out, and disconneting the wastegate rod from the flap end.
then wiggle the flap rod back and forth to make sure it's not stuck. see if the wastegate actuator rod pulls in and out as well.
if they all are moving normally, and not stuck, then... you have to get inside the turbine side of the turbo and visually inspect the wastegate flap to make sure it's still there in one peice... and makes a proper seal when closed.
we know that your wastegate actuator doesn't have an air leak in it, because if it did, you would have too much boost, and not too little... as the air pressure required to blow open the wastegate would be bleeding out...
got all that ? ;)
wastegate check time
-gavin
posted by 74.76.4...
, Sun, 8 Apr 2007 20:04:00, Sun, 8 Apr 2007 22:34:46
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