i have an83 300tdt. Has 11 lbs of boost max. Reading old posts it said to pinch hose from turbo to wastegate &test again. did that with maybe a 1/2 lb change in boost presure. i understood from the old post that i should have seen an increase to max boost . did I do it wrong or did I not understand the post ? I would like to get it to 15lbs. whats wrong with my car or testing or thinking?

help thanks JOHN