A turbo timer can keep an engine running for a pre-specified period of time, to automatically provide this cool-down period. A more complex and problematic protective barrier against oil coking is the use of watercooled bearing cartridges. The water boils in the cartridge when the engine is shut off and forms a natural recirculation to drain away the heat. It is still a good idea to not shut the engine off while the turbo and manifold are still glowing.
In custom applications utilizing tubular headers rather than cast iron manifolds, the need for a cooldown period is reduced because the lighter headers store much less heat than heavy cast iron manifolds. Rule of thumb to protect your investment is at least 90 seconds of idling to cool the exhuast manifold before turning the car off. Some cars even have their electric fans stay on for a couple minutes after the car shuts off to aid moving hot air out of the engine bay away from the turbo.
In custom applications utilizing tubular headers rather than cast iron manifolds, the need for a cooldown period is reduced because the lighter headers store much less heat than heavy cast iron manifolds. Rule of thumb to protect your investment is at least 90 seconds of idling to cool the exhuast manifold before turning the car off. Some cars even have their electric fans stay on for a couple minutes after the car shuts off to aid moving hot air out of the engine bay away from the turbo.
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