Page 1 of 3 1 2 3 LastLast
Results 1 to 20 of 42
  1. #1
    Join Date
    Jan 2007
    Location
    Cape Town
    Posts
    1,777
    Thanked: 563

    Default Is cooling down a TD still a thing?

    Do you still allow your turbo diesels to cool down before shutting off?

  2. #2
    Join Date
    Dec 2008
    Location
    Pretoria
    Age
    55
    Posts
    6,631
    Thanked: 8379

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by dph View Post
    Do you still allow your turbo diesels to cool down before shutting off?
    After a hard run- yes.

    After town driving - no.
    "K.a.k Wheeler

    2006 Jeep Grand Cherokee 3.0 CRD - 400 000km and permanent member of the family
    2014 Jeep Wrangler JKU 3.6 - no lift kit and smaller wheels.

  3. The Following 6 Users Say Thank You to Rainier Vermaak For This Useful Post:


  4. #3
    Join Date
    Jun 2012
    Location
    Benoni
    Age
    49
    Posts
    2,460
    Thanked: 10020

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Rainier Vermaak View Post
    After a hard run- yes.

    After town driving - no.
    Good avice for any turbo car, not just diesel
    Anton Muller

    Nothing upsets me more than vegetarians having pudding
    2024 X5 M60i
    2020 X3 M40i
    Birkin SR20VET race car

  5. The Following 3 Users Say Thank You to mullerza For This Useful Post:


  6. #4
    Join Date
    Oct 2011
    Location
    Kempton Park
    Age
    50
    Posts
    5,759
    Thanked: 4886

    Default Re: Is cooling down a TD still a thing?

    I would love to understand exactly what the recommended practice is.

    I was taught that it's safe to turn off the engine once the EGT's have reached a certain temperature (the specifics seem to vary but I use 150 degrees most of the time).

    But this takes far less time than some people let their cars idle for, especially if the last few 100m are driven mildly?
    Beat-up rat rod of a '96 Nissan Patrol that bears the evidence of many wonderful adventures (and a few stupid indiscretions).

  7. The Following User Says Thank You to Peter Connan For This Useful Post:


  8. #5
    Join Date
    Jul 2011
    Location
    127.0.0.1
    Age
    41
    Posts
    1,917
    Thanked: 5015

    Default Re: Is cooling down a TD still a thing?

    If I pull into a petro port off the highway, I let it idle for a minute or two.

    If I get off the highway (or get into town) and putter to my destination in traffic, I switch off as soon as I stop.

  9. The Following 2 Users Say Thank You to IcePick88 For This Useful Post:


  10. #6
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    54
    Posts
    1,962
    Thanked: 3031

    Default Re: Is cooling down a TD still a thing?

    Always....since turbos still spin at serious rpm's.
    Current - 2009 Mazda BT50 3.0CRDi 4x4 d/c
    Previous - 2005 Ranger 2.5 tdi 4x2 d/c (277 422km)

  11. #7
    Join Date
    Jun 2009
    Location
    Barberton
    Age
    66
    Posts
    7,258
    Thanked: 7792

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by mullerza View Post
    Good avice for any turbo car, not just diesel
    Yet, more and more of our cars are factory fitted with ASS (including your Beast), which makes an idle-down impossible.

  12. #8
    Join Date
    Aug 2019
    Location
    Roodepoort
    Posts
    1,353
    Thanked: 1852

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Peter Connan View Post
    I would love to understand exactly what the recommended practice is.

    I was taught that it's safe to turn off the engine once the EGT's have reached a certain temperature (the specifics seem to vary but I use 150 degrees most of the time).

    But this takes far less time than some people let their cars idle for, especially if the last few 100m are driven mildly?
    I see the same

    I have EGT gauge. Although the probes only measure the exhaust gas temps, not the turbo temp, the reading on the gauge drops very quickly - From 650 C flooring it up a hill down to 300C when you take your foot off the accelerator within a few seconds. If you drive nicely into the suburbs, it idles down to 150C very quickly. Personally, I never let it idle when I get home, turbo was still perfect after 270k km

  13. The Following User Says Thank You to Tiaan Pot For This Useful Post:


  14. #9
    Join Date
    Aug 2009
    Location
    Centurion
    Age
    58
    Posts
    2,495
    Thanked: 1178

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by dph View Post
    Do you still allow your turbo diesels to cool down before shutting off?
    What is your Owner's Manual saying?
    E.g. for my vehicle:
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	OG28GD6.jpg 
Views:	499 
Size:	60.2 KB 
ID:	724239  

  15. The Following User Says Thank You to PieterOos For This Useful Post:


  16. #10
    Join Date
    Jun 2012
    Location
    Benoni
    Age
    49
    Posts
    2,460
    Thanked: 10020

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by RoelfleRoux View Post
    Yet, more and more of our cars are factory fitted with ASS (including your Beast), which makes an idle-down impossible.
    I have not tested it but I dont think ASS will shut down an engine that was run hard. I'm not 100% sure on the BMW but I know my ex Audi montored turbo RPM as one of its parameters.
    Anton Muller

    Nothing upsets me more than vegetarians having pudding
    2024 X5 M60i
    2020 X3 M40i
    Birkin SR20VET race car

  17. The Following User Says Thank You to mullerza For This Useful Post:


  18. #11
    Join Date
    May 2019
    Location
    Brackenfell
    Age
    42
    Posts
    360
    Thanked: 978

    Default Re: Is cooling down a TD still a thing?

    This was so easy on the Tiguan. It had stop/start so after arriving at the destination I just let the car decide for itself when it wants to turn off.

    In the Mitsu, I usually wait between 15 to 30 seconds, or if there is a nice song on the radio - till it is done
    2018 Mitsubishi Pajero Sport 4X4
    2016 Mazda CX-3 2.0 Dynamic Auto - Sold
    2012 VW Tiguan 2.0TDi Bluemotion - Sold
    2009 Ford Fiesta 1.6 Titanium 3 door - Sold

  19. The Following User Says Thank You to WernerDL For This Useful Post:


  20. #12
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    54
    Posts
    1,962
    Thanked: 3031

    Default Re: Is cooling down a TD still a thing?

    Since I started driving turbo diesels I changed my driving style to accommodate the cooling down. I will always wait a minute or so. At home I have to wait for my gate to open and then I drive in and park in front of the closed garage door. Whilst opening it, the bakkie keep on idling. So when I'm inside on the right spot, its cooled off sufficiently.
    Current - 2009 Mazda BT50 3.0CRDi 4x4 d/c
    Previous - 2005 Ranger 2.5 tdi 4x2 d/c (277 422km)

  21. The Following User Says Thank You to Spiceman For This Useful Post:


  22. #13
    Join Date
    May 2011
    Location
    Stellenbosch
    Age
    58
    Posts
    1,305
    Thanked: 4195

    Default Re: Is cooling down a TD still a thing?

    After a hard drive, at least a 2 min cool down sounds about right.

    Click image for larger version. 

Name:	Screenshot_20240611_172336_Firefox.jpg 
Views:	142 
Size:	161.9 KB 
ID:	724263

  23. The Following 4 Users Say Thank You to Searcher For This Useful Post:


  24. #14
    Join Date
    Nov 2011
    Location
    Langebaanweg
    Age
    47
    Posts
    3,239
    Thanked: 2872

    Default Re: Is cooling down a TD still a thing?

    We use a 1 minute cooldown on our Pt6 turboprop engines, so I set that as my maximum cooldown.

    I usually let it idle until the EGT falls below 130°C, which is about 30 seconds minimum.
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekindē)
    '84 Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work.
    The only thing needed for evil to triumph is for a good man to do nothing.

  25. The Following User Says Thank You to jfh For This Useful Post:


  26. #15
    Join Date
    Aug 2019
    Location
    Roodepoort
    Posts
    1,353
    Thanked: 1852

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Searcher View Post
    After a hard drive, at least a 2 min cool down sounds about right.

    Click image for larger version. 

Name:	Screenshot_20240611_172336_Firefox.jpg 
Views:	142 
Size:	161.9 KB 
ID:	724263
    You might be over fuelling a tad there ...

  27. #16
    Join Date
    May 2011
    Location
    Stellenbosch
    Age
    58
    Posts
    1,305
    Thanked: 4195

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Tiaan Pot View Post
    You might be over fuelling a tad there ...
    Luckily not my vehicle, just a screen grab.

    But my 1HD-FTE can comfortably dive at EGT's of around 600oC -650oC under load.
    That's a deep cheery to dark red colour temperature wise.

    After a stop, that going to need some decent cooling off time.
    Land Cruiser 100 Series Sahara 4.2 TD
    Land Cruiser 200 Series VX V8 2UZ-FE

  28. #17
    Join Date
    Jun 2012
    Location
    WC
    Posts
    1,670
    Thanked: 527

    Default Re: Is cooling down a TD still a thing?

    Yes I still do for 2 minutes if driving over 100km/h for an extended period as that was stated in my 2009 Hilux D4D manual back then. That vehicle is long gone but that recipe has stuck, although I seem to be in the minority if I look at vehicles pulling into roadside fuel stations next to national highways. I'll keep doing it as I've never suffered a turbo failure!

  29. The Following 2 Users Say Thank You to QuQ For This Useful Post:


  30. #18
    Join Date
    Feb 2009
    Location
    Windhoek
    Age
    41
    Posts
    8,805
    Thanked: 9477

    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by QuQ View Post
    Yes I still do for 2 minutes if driving over 100km/h for an extended period as that was stated in my 2009 Hilux D4D manual back then. That vehicle is long gone but that recipe has stuck, although I seem to be in the minority if I look at vehicles pulling into roadside fuel stations next to national highways. I'll keep doing it as I've never suffered a turbo failure!
    Jup, same here.

    1. if I drive on highway/gravel and have to stop for a quick bathroom break (3 girls, so happens often), I don't switch off
    2. pottering into town after a long drive, drive slowly for the last few km's and will then switch off when at destination

    I never switch off without considering the turbo
    Gert Grobler

    VW Touareg V6 Tdi Escape; Land Cruiser 200 VX-R
    Bush Lapa Ratel 4i 1906

    Sold: Land Cruiser 200 V8 D4D
    VW Amarok PanAm V6

  31. The Following 2 Users Say Thank You to Nys For This Useful Post:


  32. #19
    Join Date
    Jan 2007
    Location
    Cape Town
    Posts
    1,777
    Thanked: 563

    Default Re: Is cooling down a TD still a thing?

    Cool, glad to see I'm not the only one still keeping ye ole' turbo in mind.

  33. #20
    Join Date
    Jun 2009
    Location
    Roodepoort
    Age
    50
    Posts
    2,887
    Thanked: 827

    Default Re: Is cooling down a TD still a thing?

    On modern cars it circulate the oil and many times also cooling water through the turbo after you switch off. My Stelvio actually has a dedicated cooling circuit complete with own reservoir tank for it. I still prefer to idle her a bit after gunning the final stretch home, just in case. My wife's Audi TT also circulates at least the oil.


    Alfa Romeo Stelvio - Bellissimo!
    Grand Cherokee 5.7L V8 (sold)
    Alfa Romeo MiTo Quadrifoglio Verde (sold but still near to me)
    JKU Rubicon Pentastar (sold )
    JKU CRD (sold)
    XJ 4liter (sold )

  34. The Following User Says Thank You to Jeepiscool For This Useful Post:


Page 1 of 3 1 2 3 LastLast

Bookmarks

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
  •