No max boost - wastegate?

[barry@moonbeast.com]

I'm trying to track down the low boost issues in my '87 5k--

It basically won't boost past 1.0 bar.

My vac hoses all look good, lots of new stuff.  I just tested that by plugging
the lower wastegate hose, and voilá, suddenly I'm getting full boost up to 1.5
bar and fuel cutoff.

Does that mean a bad wastegate diaphragm?  What else could it be?  I tried
removing the upper wastegate hose at the WG frequency valve and applying vacuum
to it- I got to 11.5 " Hg before it wouldn't hold any more.  How much vacuum
should it hold, or is that even a valid test?

What else could it be?  I think I'm getting close here...

Thanks!
=BB=

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