On reading my car manual, it says that after a period of high speed driving or
climbing up a steep incline, you need to sit at idle for a maximum of two
minutes before switching off the engine. I know this has something to do with the turbo, but why do we need to do that? What is happening with the turbo that makes this necessary? Thanks for your responses.
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its cooling while having oil fed to it
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Try searching for 'simmer' and 'turbo' this has been covered many times in the past.
Basically when turning the engine off with a red hot turbo
the oil in the turbo bearings gets burnt and the bearings start to fail. Simmering the turbo to allow it to cool before turning off the engine prevents the oil burning and the bearings last must longer.
hth
Ian L.
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Spud
Search under 'TDI Diesels - after a run' for the full answer.
Regards
John
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Its all on this site at;
www.honestjohn.co.uk/phorum/read.php?f=1&i=33491&t...1
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The exhaust side of a turbo-the cast iron bit-will be well red hot when running at max power-max speed.The main time this should cause problems is entering service areas on german autobahns where the pumps are the first items you come to;most french autoroutes have a sufficiently tortuous entrance that the turbo will have cooled-same for going home-a thirty limit will have allowed it to cool.Some very high performance engines have a water-cooled turbo to overcome these problems.
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I'm glad to see that Toyota has taken this on board and included it in the driver's manual for the Yaris D-4D. Have just ordered one for a week's test but won't get it until 29th April, so we're in Spud's hands for updates on the car.
HJ
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I've wonder if a warning light could be fitted linked to the temperture of the turbo.
This would indeed be unique as most warnings advise to switch OFF not to leave ON!
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Having owned a diesel turbo I am well aware of this need, and Mitsubishi certainly mention t in their instruction book. It seems to me though that the owner should not be expected to learn this what is obviously an unusual technique for the new comer and I would expect these days some sort of automatic program whereby the engine was kept simmering for the required period without driver intervention?
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This is the best idea , they can be obtained and are called "Turbo Timers" and will delay engine shut down for a minute or two. But, to leave the vehicle, locked and secure, on the public highway, with the engine running, will bring forth the full might of the law if you are caught and then it's up before the Beak, lots of finger wagging and tut tutting and, probably, a hefty fine. However, if some Cretin forces the door lock and drives the vehicle away, that culprit is likely to be sent on a safari holiday, at the taxpayers expense, to assist in his "bonding" with society. Here speaks a sufferer at the hands of that growing band of idle scum who target vehicles for their kicks.
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Moosh
The warning light is an excellent idea.
Can't be that difficult or expensive to rig up.
How do we get manufacturers interested, HJ ?
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Remember though that turbos in diesel engines run much cooler than they would in a petrol engine. I always let my TD car idle for about 10 seconds before driving off after starting to allow the oil circulate around the engine and the turbo's bearings. Do not start any turbocharged car and immediately rev the clock weights off it!
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Surely that applies to any car, not just turbos.
Regards
John
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