some people does say it will wear the turbo quicker, as theres more force to slow the compressor than letting it slow down gently.

SOme will say they have run with out a dump valve for years and the turbo is still ok, I personally think its a risk, some will not have a problem, so will,

The fact theres a dump valve on it in the first place I think might indicate manufactures are worried about the turbo life.

The sound is very easy to acheive on a T16 turbo, leave the orignal DV fitted but the vac pipe disconnect, fit a big air filter (to allow the sound to escape) and also a stronger actuator (like the forge one) to hold the wastegate fully shut.

I just dont want to damage your turbo or engine, I personally feel the extra stresses on the compresor might wear the seals out quicker, ie more chance of it smoking or bending the fins wich could end up going through the engine??

 

As I was curious a few years on the same question, I did a video,
running standard actuator so the sound isn't that loud and also running standard boost.
http://www.youtube.com/watch?v=lIafhsT6miI&list=UUqt1G8FTPwVJA9yVbOogWbA&feature=plcp

 

Yes the flutter is bad for the turbo. Some turbos can cope with it, some cannot.

The fact that rover/garret decided that one was needed on the T16 / T25 should be a clue I reckon.

They decided that they didn't need one for the O series turbos though.

 

theres a tiny little DV on the o-series turbo carb plenum chamber, its spring only operated. not idea what pressure its set to though.

 

That isn't really a dump valve though, as it doesn't actively dump pressure, only vent a small amount when it gets over 11psi to regulate pressure.