| That's a bit excessive imho, but to each their own I guess. Driving reasonably prior to shutdown is all that is necessary. The only time I ever let it idle is after a session at the road course. 45k so far on my setup so far without any problems. From Garrett's website: "Following a hot shutdown of a turbocharger, heat soak begins. This means that the heat in the head, exhaust manifold, and turbine housing finds it way to the turbo’s center housing, raising its temperature. These extreme temperatures in the center housing can result in oil coking. To minimize the effects of heat soak-back, water-cooled center housings were introduced. These use coolant from the engine to act as a heat sink after engine shutdown, preventing the oil from coking. The water lines utilize a thermal siphon effect to reduce the peak heat soak-back temperature after key-off. The layout of the pipes should minimize peaks and troughs with the (cool) water inlet on the low side. " It seems that Garrett intends water to be the primary cooling mechanism. As such, I would expect an electric water pump would be more effective than a turbo timer for 1 simple reason: the engine is off. Idling an engine still dumps heat into the turbo and manifold. While this heat will certainly be less than what would occur at WOT, it still must be managed after shutdown.
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