boost pipe popped off

[jas915]

So i recently changed my exhaust and had to remove the turbo the get 2 snapped studs machined out.So went away this weekend van seemed fine going along at 60 on A road then lost power.A boost hose had come off at a join which i hadn't touched( one where 2 pipe join, its a 1.9 using the AAZ inlet manifold so not quite standard boost plumbing). i reattached the at side of the road but the same happened twice more.Since being home iv reattached it as secure as possible and been for a drive and its not come off. Im wondering now if the turbo has somehow broke and the waste gate is stuck shut? would this even be possible considering it was working fine before, maybe some swarf got it the turbo? Or do you just think its a result of moving the removing the other end of the pipe/

Hoping to go away this weekend but worried the engine maybe over boosting? dont have a gauge to check.
thanks jason

[davegsm82]

If you boost pipes are popping off then you need to get better clips, there are occasions that your turbo will overboost or 'spike' and your pipework should be able to handle it.

It's taken me a long time to make my boost system durable enough to survive the way I drive and the turbo that I have fitted, believe me, I've had plenty of experience with my head in the engine bay by the side of the road after a pipe has gone 'POP-PSSSSSSHHHHhhhhhhhh'.

Might be worth you investing in some T-clamps, much stronger than jubilee clips etc which have no 'spring' in them to take up the stresses under boost.

I can't see why drilling would cause your turbo to overboost severely, unless it has been handled badly and bent the wastegate actuator or something, possibly damage to the pipe from the compressor housing to the actuator?