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Old 11-02-2013, 09:52 PM   #19 (permalink)
War_Wagon
5 Gears of Fury
 
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Join Date: Sep 2009
Location: Vancouver B.C., Canada
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Spunky - '90 Honda Civic CX
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Quote:
Originally Posted by redpoint5 View Post
I don't understand how turbos are hurt by shutting off the engine. Sure, the oil or water that cools it stops flowing, but so does the heat generation. Does a turbo continue to increase in temperature after the engine is shut down, and if so, how?
I was always told that it's because the turbo is still spinning when you shut the car off if it had recently been under boost, and once the engine stops then the shaft is still spinning with no oil circulation. I don't know how accurate that is, but it made sense when I heard it. The turbo timer would let the oil keep flowing at idle until the turbo had time to stop spinning.
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