after a journey in my lcr

[chicosanchez78]

Hi:

Recently I bought a lcr 2003 reg, and the person who sold me the car said that when I stop the car I should way for a few seconds because the turbo is running and oil is pump into the system and if I swith the engine off the system will run without oil. The same goes when I start the engine first thing in the morning I have to way before I move away.

has everyone done the same?

 

[traumapat]

yes its a good idea... coolant will flow for a while after switch off but oil wont. i usually run the last mile gently, then wait 30secs before switch off.

i tend to run her straight from turning on though. keep it under 3000 revs for the first 10 mins. ive fitted an oil temp gauge and by then temps have settled

 

[Willie]

As above, seemingly there is an issue with running the car standing still to warm up. I've always done it since mile 1 and after 85,000 miles no issues so take from that what you will.
As above I also run car at low revs for at least 5 mins before shutting off, usually the last 3 miles or so from home. This negates the need for a turbo timer with can be a week point in the LCR security

 

[chicosanchez78]

In conclusion, over the 3000rpm the turbo charges up and then I have to way a while or take it easy on the last 5 miles for it to back to normal.

is this right?

 

[Willie]

Sort of, the turbo is spun by the exhaust gases passing through it an turning an impellor which inturn turn an impellor in the compressor side to suck and blow cold air into the engine (sorry if you already know this but it makes it easier to explain this way). The exhaust gas temp is about say 800 deg. As you can appreciate with the turbo being metal it get feckin hot with this. Wheh the engine is running there is an oil feed running through the turbo picking up heat and getting cooled. When the engine is stopped its only a water line thats running through it, because your not driving the water isn't getting cooled by the radiator.
So if you keep the revs below say 2,000 RPm the turbo aint spinning (only slightly) and the cooling effect of the oil in increased and the turbo should be cool by the time you park and switch off. This also allow the turbo to cool slowly and all contract at the same rate where is just stopped it will cool at different speeds and not nearly as quick so possibly causing damage.
This is worse if you have been booting the car up big time and the turbo is glowing red hot.

 

[traumapat]

In conclusion, over the 3000rpm the turbo charges up and then I have to way a while or take it easy on the last 5 miles for it to back to normal.

is this right?

my keep it under 3000 revs from cold bit works in the oppersite way... trying to heat the engine oil and cat quickly to reduce wear. turbo spools up before 3000 but not in a huge way.... but if you keep the revs too low the engine will labour and have to work very hard on cold thick oil.

some prefer to let it run on the drive for 5 mins, but it takes longer to warm up.

its a compromise... as long as your not driving it hard from cold and not switching off straight after a hard run it`ll be fine

 

[chicosanchez78]

Hi:

thank you overyone contributed to my question, I have now a better idea how the turbo in my car works, most helpful responses thanks again guys

 

[RikH]

its something you should do with all turbo cars

its to not leave scorching hot oil in the turbo which damage seals over time if you just turn the car off, leaving it for 30sec - 2 minutes is a way of letting the oil carry on circulating and drop in temperature before you turn it off. This is what "turbo timers" do which you'll find on ALOT of jap performance cars

 

[stevie16v]

i've always been advised about this on any turbo diesel. I drive diesels at work and they get driven very hard, red lining etc and can be from pretty much cold some time (emergency services, not boy racer lol)
some have over 100k on the clock and i havent heard of any turbos going, and they are f...ords which IMO aint as good quality as vags