http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=IG&P=12
Just for giggles, when was your last boost leak check?
EDIT: I just looked at your video, was that a first gear punch? If so, you look to be lacking on power. When I rebuilt my friends car, 87 turbo 5 speed, it would smoke...