im not really sure bout symptoms of blow turbo, but black smoke is normally rich mixture (i.e no extra air when the maf says you are on boost) check the pipes between the turbo and the inlet manifold, if you are not intercooled, and still using the std cross over pipe between the turbo and the inlet, then the turbo end has a orange seal, this i think cant take 10 psi boost, and has prolly blown out.
there is plenty of guys on here that will tell you exactly what those symtoms are.
good luck
