You sure on that i had a t28 on a 1.5L et turbo that boosted to 19psi, 130fwkw, wasnt smokey and that too didnt spin over at idle, maybe its a bit to do with bush or roller bearings as well. Beware the 2nd hand turbos, i wont ever buy another unless ive seen it running fine. Bought way to many fukt ones of the net and importers, they can look fine, have minimal shaft play but still smokey because of the seals. The turbo on the 180b i had used to smoke a bit untill it warmed up then it was ok, still used to spit a bit of oil through the cooler. We cheated and put a tiny as restrictor in the line to stop it, cant be good though. My exa turbo used to smoke massivelly when the exhaust wasnt on from the dump pipe to exhaust, must have been the back pressure helping or something.