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Home > Technical > TURBO COOL-DOWN |
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iain cooper Member Since: 27 Aug 2007 Location: north of Glasgow Posts: 1989 |
I always let mine run for a few seconds before switching off, but as far as I know you don't need to do it.
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26th May 2011 12:36 pm |
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landy19840 Member Since: 13 Mar 2011 Location: Non Posts: 1817 |
I am sure on the new td's it has some fancy cool down pump when the engine is switched off. My td5 defender use to whine for about 30secs after shut down, that was a pump that kept running oil round the turbo I thinks! |
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26th May 2011 2:05 pm |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
I only wait if I was driving on boost (hard, sporty way) for extended periods of time. No more than 2 minutes.
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26th May 2011 3:39 pm |
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oldgeezer Member Since: 09 Apr 2011 Location: Wiltshire Posts: 1302 |
Jacksback, you are quite correct, if I was fitting an engine delay module I would set the cool down time for three and half mins. I never switch mine off for at least a min and when towing in europe in hotter climates I normally allow it to cool for 3-4 mins just ticking over. The lower combustion temp at idle helps lower the temp in the turbo which helps prolong the life of the seals and reduces the oil cooking in the oil galleries around the turbo causing a glogged up effect overtime. I have run diesels for years including driving trucks and never suffered turbo failure , even in the middle east! Good luck and keep it up !. |
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26th May 2011 4:23 pm |
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Dave Member Since: 04 Jul 2007 Location: Somewhere Near You Posts: 2666 |
It isn't the cooling fan, it's not a whirring or buzzing sound. It's a continous high pitched note almost like a piezo sounder if you know what I mean. ______________________
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26th May 2011 5:00 pm |
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D99 Member Since: 08 Mar 2011 Location: UK Posts: 386 |
Dave my 57 Td4 SE does exactly the same, then there's a noise like a solenoid or a valve or somthing working when it stops. |
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26th May 2011 5:12 pm |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
There is a difference between the noise being made by the electronic throttle that reset itself and the one made by the cooling fans after a very hot engine is turned off.
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26th May 2011 5:39 pm |
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Big Dave Member Since: 22 Nov 2009 Location: Yorkshire Posts: 1055 |
I've heard both the solenoid and whirring noises...however neither are 'turbo timers' or cooling systems for the turbo.
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26th May 2011 5:41 pm |
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chicken george Member Since: 05 Dec 2007 Location: N. Yorks Posts: 13289 |
I just take it easy for the last 1/2 to 1/4 mile before parking, then maybe leave it ticking over whilst undoing seatbelt etc. then press the fob to release and it doesnt stop the engine so I press stop button and then press the fob again stupid system At work
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26th May 2011 6:17 pm |
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jaksbak@freel2 Member Since: 26 Dec 2010 Location: Fraser Coast Posts: 225 |
Wow. Lot's of replies and all are very helpful (I think!), so thank you. Diesel engines have changed quite dramatically ove the past 5 years or so and so too the turbo technology and monitoring systems, so who knows if there's any need for those 'after-market' mechanisms that many people are investing in. There's an old saying that "where there's smoke, there's fire" so there is probably a lot of value in allowing the turbo to cool down, at least partially after a heavy workout and more so if the turbo has been engaged recently for any length of time. Thanks again. |
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27th May 2011 10:32 am |
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simont Member Since: 15 Feb 2011 Location: Sunderland/Newcastle Posts: 1809 |
I would think in general most journeys are probably like my experience is.
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27th May 2011 10:38 am |
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Big Dave Member Since: 22 Nov 2009 Location: Yorkshire Posts: 1055 |
But even then you'll be off the throttle for 30 seconds or so as you slow from cruising speed, the tootling finding a space, there'll be the best part of 2 mins with the turbo not doing anything and cooling down then. Mate of mine has a track car with a turbo timer on it and that doesn't engage if you take the last 3 or 4 corners steadily into the pits after a session. It's all a bit overrated on 'everyday' cars nowadays. When working none of the plant machinery my family's business had never had them on, and they would more regularly go from full power to stopping in short spaces of time, with no problems. Mine: 2012 Golf GTI Edition 35 Family's: 2009 Freelander 2 HSE TD4 Auto, Stornoway Yorkshire - God's County |
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27th May 2011 11:30 am |
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Past master Member Since: 30 Jun 2010 Location: Isle of Ely Posts: 2710 |
I've not read about the need to cool the turbo before. However owners' manuals used to warn about oil pressure. Namely, that the turbo spins very fast so needs decent oil pressure, so the advice was always to idle the engine and allow the pressure to rise before accelerating, and similarly, to idle for a few seconds before switching off, to allow the turbo to spin down. The manuals also warned against the old (and nowadays completely unnecessary) habit of reving the motor before switching off, for the same reason. As far as I know that advice still stands, although it may be that bearing technology has improved since the early days? |
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27th May 2011 9:29 pm |
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gerryca Member Since: 25 Apr 2011 Location: dublin Posts: 8 |
It hasn't.
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27th May 2011 9:35 pm |
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