Does anybody know if the Freelander 2 needs to be kept running for a while after long drives to allow the turbo to cool down?
There are quite of number of Turbo Diesel's here in Australia that are fitted after-market mechanisms that do just that. It's a bit wierd when you witness people get out of their vehicles, lock the door and walk off with the motor still running. Motors continue runing for 3 or 4 minutes.
After a workout in the SD4, I hear a "whirring" noise coming from the engine bay - is that some sort of turbo cooling system?

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.

the eco stop/start doesn't do it so it's probably not required

Iain

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!

I only wait if I was driving on boost (hard, sporty way) for extended periods of time. No more than 2 minutes.
If I was driving in normal manner, even after cruising at 70 mph on highway, I don't wait.

The 160HP TD4 variant, doesn't have any turbo/oil cooling system that works after power-down.
I don't know, yet, if the 190HP version has one. But I don't think so...

As for the buzzing/whirring, I believe that are the radiator cooling fans. They can run for 1-2 minutes after the engine stops, depending on how hot was the engine.
The versions equipped with Webasto supplementary heaters have an additional water pump to circulate the water inside the system when the Webasto system is working. Only and only if the Webasto was working during power-down, the water pump will continue to work for about 30 seconds to cool-down the Webasto burner. Otherwise, no. This additional Webasto water pump is easily heard inside after switching down the engine.

But it is easy to see. Just pop the hood (car's ) when you stop the engine and hear the sound, and see from where it comes. I bet it is the radiator cooling fans...

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 !.

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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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.

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.

The high pitched sound, made by the electronic throttle, was discussed here: http://www.freel2.com/forum/post70048.html#70048

Last edited by alex_pescaru on 26th May 2011 6:41 pm. Edited 1 time in total

I've heard both the solenoid and whirring noises...however neither are 'turbo timers' or cooling systems for the turbo.

There aren't many normal driving situations where you need to be idleing to cool the turbo, especially on relatively low pressure turbo's like on the Freely's. It's more about ensuring the turbo is spooled down before stopping the engine (so no revving then immediately stopping!) and this takes a matter of 2 or 3 seconds.

There's very few times I'm sure where you'll be driving 'on boost' and then parking and stopping the engine in less than a minute or so so there's no point in worrying about it. Mine: 2012 Golf GTI Edition 35
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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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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.

I would think in general most journeys are probably like my experience is.

In that my journeys always end with several miles of 30mph drive after the 70mph motorway driving.


I can't think of many times when I would finish 70mph driving with an immediate stop.

Only exception I can think of is stopping at the motorway services on-route - which I try to avoid. 2002 Honda VFR800
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Quote:

Only exception I can think of is stopping at the motorway services on-route - which I try to avoid.

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?

It hasn't.

Always let the engine idle for a bit.
After a high speed run, either back off 5 mins towards the end and let it cool down or...

1 minute of idle for every hour of high speed driving is the best advice.