I usually do the seatbelt and allow maybe a minute after a hot run, but that includes the time backing into the carport.
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I usually do the seatbelt and allow maybe a minute after a hot run, but that includes the time backing into the carport.
A few years ago, a member of AULRO did a test in his Disco, recording boost and EGT every ten or fifteen seconds. It was done primarily to look at the time lag between changes in boost and changes in EGT.
The results showed that very soon after turning off the highway onto residential streets, the EGT dropped significantly.
Turning into his driveway dropped the temperature even further.
By the time he stopped in the carport, temperatures were low enough that just the time taken to apply the handbrake, remove his sunglasses and undo his seatbelt was more than enough cool down.
People whose driveway is only metres away from a high speed freeway might need a bit longer. :) Normal suburban driving at legal speeds with a couple of intersections seems to do a lot to reduce EGTs.
If modern turbos were damaged by shutting down quickly, wouldn't there be a huge number of failures in the large number of vehicles driven by mechanically ignorant people, some of whom don't even know whether their engine is fitted with a turbo?
My EGTs are pretty high by the time I get to my street, as it's uphill all the way. I slow to around 40 in my street ( kids, dogs ) and by the time I'm in my drive with the brake on and the lights off I can usually switch it off at around 200. This is in the 300. I have no idea in the TD5, but always give it around 30 secs for the reasons given about turbo spin down. When driving the Scania (R730), by the time I got the thing parked it was fine to switch it off. That thing had done 430,000 ks when I finished, and had no mechanical failure other than the gearbox.