[urq] wastegate diaphragm

[urq]

Which side of the diaphragm are you testing?  If you're testing the upper
chamber I would agree that you would expect to see that it holds a good
vacuum.  The bottom half is where the manifold pressure is applied, and that
side has the rod which goes to the wastegate proper.  I've never tested the
lower chamber for how good a seal it makes, but I wouldn't be surprised if
it was leaky.

It could be that the wastegate mechanism is sticking or the WG spring is too
stiff or binding.  You may want to pull the cap off and verify that you can
move the wastegate up and down, and that the spring is good.

Steve B
San Jose, CA (USA)

-----Original Message-----
Hi y'all!
 
My car is running great! 
Diff lock panel is in place, both locks work, and the LEDs work too!
But, it's boosting up to 20-22psi, even at 1/3 to 1/2 throttle, 4500 rpm.
It feels like the timing gets retarded during this, which is good.
Problem is it doesn't hold vacuum. Visually I can't find a hole in any of
my WG diaphragms. Also, I just replaced the hose.
 Could there be another leak source? A cracked WG cap?
 
TIA
 
Gary