The fact that I put 240,000 miles on my first turbo Daytona (son totaled it at that point) and currently have 176,000 miles on my Shelby Daytona and never had a turbo failer or any issues would suggest that the turbo timers may be over kill (never did anything extrodinary to cool off the turbo).
The only thing I have ever done in the way of a cool down was if I was romping on my car I would make sure I drove it for a mile or so easy (no boost) before shutting it down or let it idle for a few seconds. I also use synthetic oil which has a much higher break down temperature. The reason for the cool down was so you do not cook the oil in the bearing housing of the turbo. This issue was significant when turbo's did not have water cooled bearing housings, chrysler has had a water cooled housing since the first turbo car in 1984. At that time they actually made a big deal out of the fact the water would continue to circulate through the housing after the engine was shut off to cool and protect the turbo.
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Dave Clement
\'03 GT, Electric Blue
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