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Re: My turbo seems to violently kick in at 4k RPM sometimes and other times

well the DV could be bad, the DV is not utilized until after you release the gas pedal that is when the pressure build up and could go against the turbo. What may be occuring is that when you shift and have released the gas to shift, the DV may fail. In this sense there pressure on the turbo from both ends, which in affect causes it to do nothing, but as the RPM range increases the pressure you want to go through to turbo catches up, which causes teh violent boost. The turbo will taper off at higher RPMs cause of its stock design. If you have a chip the turbo would continue a little longer. I would get the DV checked out...it is possible for the DV to break even with the car being all stock. Hope this helps.
 

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Re: My turbo seems to violently kick in at 4k RPM sometimes and other times (ALPHA_NUMERIC)

Try listening to the engine after you release the gas pedal, you nay hear a honking sound which would mean the DV is busted.
 
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