Originally Posted by
gcfcos
I took mine off and fitted a group a air filter to get the chatter but I'm not sure it does the turbo any good? Few turbo places have told me on the t series turbos it doesn't matter but I'm not 100% sure
It doesn't, look at the physics, without a DV the boost has nowhere to go when the throttle closes, so it is forced backwards through the turbo, trying to turn the impeller, which is spinning extremely fast in the opposite direction (this is the 'chatter' you hear, and has been known to break the blades).
A DV, opens and safety releases this pressure, preventing this from happening.
Martin