Could be a bad turbo. Is the car running fine besides? Mine would run fine until I had to use some boost then it ran like poo and had no power. Pick up a used or rebuilt turbo and do it your self. Its easy. You may want to change the O2 sensors, sparkplugs and clean the MAF, throttle body, after you replaced the turbo to get everything clean again. Unplug the battery for 15min to reset the ECU as well.
Sounds like you might have blown a ring on a piston. and the black smoke is oil being burned...find out what the engine code is....but a blown ring usually requires an engine rebuild to fix. Hope this helps.....sorry about the bad news
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