Difference between turbo issues, ALDA issues and wastgate

I have a 1985 Turbo federal model...no particulate filter. I bought the turbo rebuild kit and tested the turbo beforehand. It only boosts to 7.5 psi without the installation of the kit (in summeer). I have not rebuilt the turbo yet. The car is extremely slow off the line and in cold weather....I can floor it for three minutes with no increase in RPM. (Some people even cut my block heater cord off because it smoked so much....as if that would stop me!)

So..how do I tell if the issue is wastegate vs. ALDA vs. turbo needing a rebuild?
The turbo gauge from the kit oscillated at 7.5...to me...that would mean wastegate...though I couldn't hear it unlike my previous turbos.

Thanks for any advice.

g

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