Advertise on DISCO4.COM
Forum · Gallery · Wiki · Shop · Sponsors
DISCO4.COM > Technical (D4)

Looking after your turbo(s)
Post Reply  Down to end
Page 2 of 2 <12
will.i.am
 


Member Since: 05 May 2016
Location: hertfordshire
Posts: 250

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Keswick GreenDiscovery 3

i never go above 2000-2500rpm untill my engine has warmed up - oil reached optimum viscosity and temperature.

i would also always let the engine idle for at least 30 seconds before i turn it off on whatever journey and where i have done 100-200plus miles, i would let the engine sit idleing for around 5 mins - this has been out of habit amd what i have been tought.
  
Post #226289618th Nov 2021 8:16 am
View user's profile Send private message View poster's gallery Send e-mail Reply with quote
sasdiscos
 


Member Since: 22 Feb 2013
Location: Northants
Posts: 885

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Bali BlueDiscovery 4

Turbos can run from 300 to 500 and anything up to 1200 deg c. Do you think 30 seconds is going to do anything to cool down a turbo?

Any modern engine will run under many conditions and take a lot of abuse.

Apart from a land rover engine!

Steve.
 You remind me of a younger me, not much younger mind...perhaps even a little older!  
Post #226299618th Nov 2021 8:21 pm
View user's profile Send private message View poster's gallery Reply with quote
will.i.am
 


Member Since: 05 May 2016
Location: hertfordshire
Posts: 250

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Keswick GreenDiscovery 3

Better than stopping and turning it off straight off........
  
Post #226301718th Nov 2021 10:38 pm
View user's profile Send private message View poster's gallery Send e-mail Reply with quote
shanegtr
 


Member Since: 22 Aug 2014
Location: Perth - Western Australia
Posts: 142

Australia 2005 Discovery 3 TDV6 SE Auto Cairns BlueDiscovery 3

Older journal bearing turbos it was a lot more critical to let them spool and cool down. They could damage the bearings if shut off with the turbine doing anything other than idle speed due to oil pressure disappearing. These style of turbos also relied on the oil flow for cooling of the core. If shut of while hot these could cook the oil and cause coking within the bearing core.

Newer ball bearing turbos don't require anything near the oil flow to stay lubricated as ball bearings don't require all that much oil to stay lubricated - its much less than you would think. So shutting them down while the turbo is spinning is no where as detrimental to the bearings as a journal bearing. And due to the lack of oil flow most of these are also water cooled which should keep the core cooler and reduce the chance of oil coking in the bearing.

So I'm not saying you dont need to let the turbo's spool down and cool - its still good practice to do this, but its no where near as critical as it once was.
  
Post #226303519th Nov 2021 5:12 am
View user's profile Send private message View poster's gallery Reply with quote
Sidewaysste
 


Member Since: 10 Oct 2021
Location: Pinxton Nottinghamshire
Posts: 23

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Bali BlueDiscovery 4

Has nobody mentioned the difference between sleeve and rollerball bearing chras?

A sleeve bearing turbo required oil pressure to prevent metal to metal contact in much the same way as the shells in an engine. Turbos take a period of time to decelerate and at full boost will be spinning somewhere in the region of 180,000 to a quarter of a million rpm.

The idea behind the idle period before shutdown was to allow the turbos to return to idle speed and from that to 0 rpm would be a much shorter space of time so the amount of time without adequate bearing lubrication and support would be reduced to a minimum.

Nearly all modern turbos use roller ball bearings which operate on a completely different principle, yes they require oil but not a a high pressure, they can run quite happily with little to no oil pressure so long as there is still some oil and they're not running dry. hence it isn't critical to allow the misnamed cooldown period. That and they tend to be water-cooled which prevents hotspotting.
  
Post #227224711th Jan 2022 6:35 pm
View user's profile Send private message View poster's gallery Reply with quote
forest66
 


Member Since: 04 Jan 2021
Location: Lymington
Posts: 84

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

back in my ren 5 turbo days we let it tick over if its been a hard run and you come to quick stop, it went that if you shut off quickly the oil would stop and the turbo will spin on and heat the shaft up and trash the bronze bearings and shaft ,

i used to work for uk turbos building them and fitting them back in the late 90s,
the boss drummed in to us all the importance of the 30 second rule at start up, and stop, this was for the higher revving petrol engines with bronze bushes, and his shoddy turbos built with used parts at times Confused

derv motors there wasnt any real need back then they were lower revving , in fact i dont remember seeing a blued shaft on a derv turbo,

modern oil pumps are very good , but it cant hurt to do if you want modern dervs are higher revving than they used to be.

the 30 sec rule is what you want to do if you want to try it,

tick over for 30 sec at start up same at stop and job is a goodun that is all you need to do

i dont bother with it these days no need imo on modern turbos, unless its being shagged about maybe, , i dont race around in my d3 it does tick over before use and when i pull up which is plenty good enough i plod mostly like the lord of the manor!
  
Post #227227911th Jan 2022 9:31 pm
View user's profile Send private message View poster's gallery Reply with quote
PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4577

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

I was in Toyota dealership a few days ago when the service manager showed me a turbo from a car that was not producing even scintilla of boost.

It looked fine, very little end float, and was surprisingly clean too. It was only when I spun the impeller I then noticed the turbine was stationary. Snapped shaft, although the turbine did move freely even if it was independent of the impeller. Laughing
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #227228111th Jan 2022 9:53 pm
View user's profile Send private message View poster's gallery Reply with quote
Justme
 


Member Since: 09 Aug 2015
Location: Pwllheli North Wales
Posts: 104

United Kingdom 2005 Discovery 3 TDV6 GS Manual Unknown ColourDiscovery 3

robpenrose wrote:
So how do modern turbos and stop start work then? Do they have something in place to protect turbos?



Electric oil pumps to the turbo.
  
Post #227230912th Jan 2022 12:26 am
View user's profile Send private message View poster's gallery Reply with quote
NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10463

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

Quote:
Electric oil pumps to the turbo.


Which LRs have such electric pumps please?

NJSS
 Am I Gammon or Woke ? - I neither know nor care.

2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t. 
 
Post #227232912th Jan 2022 8:21 am
View user's profile Send private message View poster's gallery Reply with quote
Justme
 


Member Since: 09 Aug 2015
Location: Pwllheli North Wales
Posts: 104

United Kingdom 2005 Discovery 3 TDV6 GS Manual Unknown ColourDiscovery 3

No idea but I know some cars do have them.


Or was it an elec coolant pump in addition to the main pump that cooled the turbo my old astra J ecoflex had?

Will have to check now.
  
Post #227234012th Jan 2022 9:04 am
View user's profile Send private message View poster's gallery Reply with quote
NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10463

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

Some EVs certainly have electric pumps to lubricate transmissions & to replace the vacuum servos we see on ICE vehicles.

I'm not aware of any JLR ICE vehicle with an electric oil pump, but I stand to be corrected.

NJSS
  
Post #227237112th Jan 2022 10:45 am
View user's profile Send private message View poster's gallery Reply with quote
Justme
 


Member Since: 09 Aug 2015
Location: Pwllheli North Wales
Posts: 104

United Kingdom 2005 Discovery 3 TDV6 GS Manual Unknown ColourDiscovery 3

NJSS wrote:
Quote:
Electric oil pumps to the turbo.


Which LRs have such electric pumps please?

NJSS



I never said any Landrovers did.

Was not aware that we cant talk about other cars in here Sad
  
Post #227237712th Jan 2022 11:01 am
View user's profile Send private message View poster's gallery Reply with quote
Dondiddy
 


Member Since: 26 Dec 2019
Location: Hamilton
Posts: 306

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Yulong WhiteDiscovery 4

Does that mean that I can`t mention that my Volvo XC60 T8 has an electric oil pump as the ICE is constantly stopping and starting during normal running as it switches between the ICE and battery power? Whistle
  
Post #227242512th Jan 2022 2:03 pm
View user's profile Send private message View poster's gallery Post Reply
Display posts from the last:  
Post Reply Back to top
Page 2 of 2 <12
Jump to:  
Previous Topic | Next Topic >


Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



DISCO4.COM Copyright © 2004-2024 Futuranet Ltd & Martin Lewis
DISCO3.CO.UK RSS Feed - All Forums

DISCO4.COM is independent and not affiliated to Land Rover.
Switch to Mobile Site