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Originally Posted by drunken monkey
The other good thing about them is that they can deal with a hell of a lot of heat and they also radiate very very well. Means you don't have to give your engine that cooling down period.
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the cooling-down period isn't for the benefit of letting the turbine wheel cool, it's to keep oil flowing through the turbo as the bearing unit cools. this prevent oil from coking and damaging the turbo. keeping oil flowing as the turbo cools prevents any damage.