If your ALDA is removed, shimmed up too high, or broken, black smoke ensues at off-boost RPM when you goose it. That'd be normal. After about 2500 RPM if you still have smoke, it's not the ALDA's fault.

Black smoke should stop when you're driving (got load) and turbo is producing output and you're feeling power. If it still smokes in these conditions your finely tuned IP could be too rich, your turbo is not producing enough air, or that's some other kind of smoke... like that oil from the turbo is more chronic than you think and it's dumping oil into the exhaust side as well for a smoke show.

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Cheers!
Scott McPhee

1987 300D