It normally runs at about 1.05 bar
(about 15psi) with my Mines ECU.All of a sudden, last thursday it wouldn't boost over 0.55 bar, and building up boost slower than normal whyle making more hissing noise than usual
(I have a Arc intake, so can hear it spool up).After some checking, it turned out that:
-when applying boost to the actuator hose, the actuator did move the wastegate valve, so that was working-even when taking off the compressor to actuator boost signal hose (in this way the boost is not restricted at all and should peak at over 1.6 bar), it still wouldn't boost more than 0.9 bar, so my guess was that even though the actuator was working, the wastegate valve wasn't fully closing for some reason.I then with a boost/vac pump applied boost to the actuator a few times, letting it snap back a few times, and hey.
.... when making a trial run, all was well again, problem fixed......I thought 
Next day
(friday) I went away for a long weekend run (1100 Km) to Duderstadt meeting in Germany and the first 200km or so all was well. However at some point I again couldn't boost more than 0.55 bar, so the wastegate was again not fully closing.
I tried the trick with the actuator again but no success, so had to run almost 900km with low boost and probably the wastegate never fully closing.The car is running perfectly, just not boosting over 0.55 bar
Am I correct in my assumption that the wastegate is not fully closing?
Will I have done damage to it running 900Km this way, will it have burnt as If I am correct that it doesn't close to the turbo body it will probably have been extremely hot, not cooling down to the turbo body when closing as it should?
Is this a known problem, have other Turbo owners had this happen too?
Is there any way to possibly fix this without taking the turbo off, can it be fixed at all if the wastegate is defective and/or burnt?
Any advice much appreciated.
