Originally Posted by foreigneRS
we are talking here about a volume of air, certainly way less than 0.5 m^3 with a pressure of 1 or 2 bar above atmospheric going out through a tube with a couple of inches diameter (although much smaller past the turbine). how fast can that air be going? the force would be proportional to the volume flow. very fast air through a small tube does not create a large force, it creates a large pressure perhaps that could do some localised damage.
that isnt that pressure itself that causes the damage, but the change what air makes on a compressor. the air volume, pressure and flow velocity are dependent on each other, but they can all be changed seperately, when you modify your turbo. but when you change one, others will change too.
Originally Posted by foreigneRS
are you sure that it's the dump valve cannot flow enough, or just that the balance of spring and pressures is not correct?
yes, i am. when me and my friend installed a bigger DV, it solved Chatter problem. we did try to adjust DV but it wasn enough. there is systems whit 2 DV too.
Originally Posted by foreigneRS
the air must go past the compressor wheel whilst the pressure is higher inside the system than outside. it's nature. unless the system is sealed, which it is not as the compressor wheel has a clearance around it.
when your throttle plate closes, compressor wheel still keeps spinning at same direction. when air gets back to compressor, from the throttle plate, the air force tryes to change the direction of compressor wheel rotation. the rotation direction wont change, but the force that air makes, works against to normal rotation direction.
Originally Posted by foreigneRS
but in a turbo, it will be blowing equally on all sides so will not cause an imbalance.
good discussion so far
imbalance problem isnt from that blowing egually, but from that it tryes to force compressor wheel to rotate to different direction, than normally. if you have a fan, blow it on the otherside and check what direction it will rotate. then blow to otherside and you will see, that rotation direction is diffirent.
yes, its good always to have a discussion. it is kinda hard to explain this, when its not in my native language. but bare whit me.
