Turbo cooling D4 3.0

[dultim8]

Hi Guys

Just wondering if it is necessary to let the car idle after driving around to cool the turbos?
Im new to the Landy world and this question came up when chatting with my dad.
thanks.

[Robocop]

I always thought it was enough, once at the in town from a longish drive, the 4-5 mins at 50kph putting from the town limits to home.

[Disco4SE]

I do much the same as Robocop. Drive slowly the last few klms from home careful not to over rev.
Also, once I'm home, I get everything out of the car that I need to take in etc, then turn the vehicle off.

Always done this for safe measure. Don't believe in switching it straight off.

Cheers, Craig

[Robocop]

I did try & edit my last post but it didn't work.. Anyway, I usually turn the engine on a few mins before leaving to get the blood flowing, and the heater for swimbo..

[Disco4SE]

I don't agree with letting the vehicle warm up prior to driving off.
My father in law who is a diesel engineer & mechanic, advised me to drive the vehicle immediately after starting it.........but drive it gently until running temperature is reached.
This way, the oil will get pumped around the engine quicker.

Makes sense to me. Been using this method for 20 years .

Cheers, Craig.

[Robocop]

I don't disagree, my dad does the same thing. I think I read on this forum back when I had my defender where a bloke worked for CAT or similar & mentioned a carbon build up if left idling for too long. My problem is everything in town is within a 5km radius unless I go to Griffith or Wagga. Lots of short drives.

[dultim8]

thanks for the replies fellas. Just wanted to see what everyone else does.
I have an old turbo diesel 4 runner that i drive around slowly after a workout to let her cool. If I cant do that then i just let her idle for a few mins..

[MR LR]

I let all our diesels 'run down' it's something you learn on the farm, however with all the computer whizzbangery i think the engineers would have built something into the 'intelligent ignition (push button)' stuff to prevent the car turning off with hot turbo's, also what about the 'intelligent stop start' on gaylanders (Freelanders) and gayrangers (Evoques) how does that not fritzel your turbo???

[Disco4SE]

I let all our diesels 'run down' it's something you learn on the farm, however with all the computer whizzbangery i think the engineers would have built something into the 'intelligent ignition (push button)' stuff to prevent the car turning off with hot turbo's, also what about the 'intelligent stop start' on gaylanders (Freelanders) and gayrangers (Evoques) how does that not fritzel your turbo???
I agree to your theory to a certain extent. I recently brought the wife a BMW X3 and it has the same 'stop / start' function. When you pull up at the lights etc, the engine turns off. You can override this function by pushing a button beside the start / stop button.
Still don't agree that any turbo charged engine should be shut down immediately after driving.
Call me old school, but for piece of mind, I'll keep doing what I'm doing.

Cheers, Craig

[isuzurover]

I let all our diesels 'run down' it's something you learn on the farm, however with all the computer whizzbangery i think the engineers would have built something into the 'intelligent ignition (push button)' stuff to prevent the car turning off with hot turbo's, also what about the 'intelligent stop start' on gaylanders (Freelanders) and gayrangers (Evoques) how does that not fritzel your turbo???

Don't bet on it - they just don't expect the engine to last long enough.

However - stop-start systems are used in traffic, when EGTs are lowest.

IME with TD engines the only time you need to idle before shutdown is if the engine has been working hard. E.g. - after driving up very steep, long hills in low range offroad, I have needed to idle for 1-2 mins until the EGTs are <200oC.

As mentioned, idling a cold engine is bad.

[Barryp]

Drive slower before you get home and let it idle while you take off seat belt etc. Don't want oil to cook in the turbo oil gallery as heat runs up the turbo shaft after shutdown. No need to be anal but don't pull off the expressway and shut the endine down immediately. Common sense.:D
Regards
Barryp

[Stuart02]

I was told by a diesel mechanic that all this turbo cooling stuff pre-dates intercoolers and modern bearing turbos, and a bit of gentle driving before shutdown is more than enough...

[Disco4SE]

I was told by a diesel mechanic that all this turbo cooling stuff pre-dates intercoolers and modern bearing turbos, and a bit of gentle driving before shutdown is more than enough...
You are probably right Stuart.
There are a lot more Turbo Diesel vehicles on the road and if it were that important to cool down the vehicle, there would be warning signs all over the vehicle.
When we brought the wifes car recently, the salesmen suggested that there was no need to.
Having said this (as mentioned in previous post) I'll keep doing what I'm doing, knowing that I am looking after my hard earned $ as best as possible.

Cheers, Craig

[dultim8]

Thanks again fellas.
I know its common sense to drive slowly and let it cool down gently. I would never turn it right off after heavy use.
Im upgrading from a diesel Challenger so thats what i always do..
Just wasn't sure about the twin turbo setup the new disco has whether it would be any different..
Good to know about the "no idling" at startup.

[Pedro_The_Swift]

The more important thing with diesels is to give them a hard time.
The problem is how to do this with something that makes that many Nm's:p

[dultim8]

Why give them a hard time??? Please explain

[Pedro_The_Swift]

From wiki--
"Running the engine under very light or no load prevents the oil film placed on the cylinder wall from being scraped away by the expanding compression rings. The rings will instead �hydroplane� or ride over the deposited oil film, allowing it to be exposed to the cylinder combustion. The oil film will then partially burn on the cylinder leaving a residue that will build up and oxidize over time. Eventually this leaves a hard deposit on the cylinder wall that is very similar to the glaze left from flash burning. My caution to those just running the engine as a normal daily driver (without some loading) and especially those who love to idle their vehicles, expect some VERY extended break-in periods Expect oil consumption forever due to oil glazing. The rings never really seat well if they cannot expand from the dynamics and heat that a load produces."

so hook a boat up and tow it up a big hill;)

but hey,, dont believe me,, ask the question in the Tech Forum :)

[discotwinturbo]

I think it's well known that diesels need to be worked on a regular basis. During run in, even harder.
Extended idling is not good (a couple of minutes does not hurt).
It's just common sense for cool down as others have said.
Brett....

[dultim8]

so is foot the the floor a good way to run them in??

[Pedro_The_Swift]

No...
I'm sure the LR handbook explains what is required--;)

[dultim8]

I havent picked up the car yet, do so this week. Ill definitely have a look through it and Im sure it will be helpful.

[Disco4SE]

so is foot the the floor a good way to run them in??

dultim8, I am lead to believe not to over rev a new engine, especially a diesel, however dont be afraid to work it.
I was a bit weary about towing my 2.2 ton boat on a four hour trip not long after I bought it (only travelled 1,500Klm's). According to my father in law, its the best way to run it in.

Once the engine is run in, certainly dont be afraid to 'blow the cob webs out' every now and then. Just make sure that the engine is at running temperature.

Cheers, Craig

[CraigH]

I drive side loading garbage trucks for a living and these vechiles work load is rated as severe service, hard on transmission, engine and especially the cooling system due to the low speeds.
We blow turbos up every now and then but According to our mechanics the best way of extending their life is regular oil changes. If the vechile has been working hard and hot idling down for a couple of mins in theory should help prevent the oil from boiling in a hot turbo, but it dosent seem to make them last any longer.

[DiscoWeb]

so is foot the the floor a good way to run them in??

More fun to find a big steep hill with lots of dirt/sand/mud etc stick in 2 low and haul up it, then let it idle for 2 min, turn around go down and do it again until you are happy. Could take all day !!!

Now that is a great excuse to get you new D4 dirty.

George

[Dougal]

You'd have to be driving auto-cross style to get a turbo hot enough to need idle time when around town.
Even from a 100km/h flat cruise, pulling to a stop will see your EGT's low enough to not need any idle down.

If you get to the top of a mountain, don't shut it down straight away. Not just for your turbo but your cooling system. Good times at ski fields watching cars start to boil a minute or so after they've been shut down.

[dultim8]

so how should i run it in if i dont have any big hills nearby or a boat to tow around???

[discotwinturbo]

so how should i run it in if i dont have any big hills nearby or a boat to tow around???

Don't wrap it up in cotton wool. Use the load pedal but don't thrash it.

Brett....

[Pedro_The_Swift]

Isnt this in the World Famous FAQ??:o:o:p

I'd think it would be in the owners manual.

[dultim8]

Hi Pedro

I had a look in the FAQ located here. http://www.aulro.com/afvb/d3-d4-rrs/93220-aulro-discovery-3-4-rrs-faq.html
I could not find anything about running in a new vehicle.
Would you please be able to point me in the right direction to find it?

[Dingmark Jim]

The issue on older turbos (and I'm most familiar with turbos on aircraft piston engines) is that the idle time was also to give time for the fast-spinning turbo to stop spinning before the bearing lubricant stopped flowing. It's not just to do with heat. Modern road vehicles seem to have other means of causing the turbo to spool down quickly.