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  1. #41
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by PieterOos View Post
    How did she test it?
    Fuel consumption over 6 months using and then not using for another 6 months. Regular work trip daily. 1.5 litres /100 km more using ASS.
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  2. #42
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by pwgg View Post
    Fuel consumption over 6 months using and then not using for another 6 months. Regular work trip daily. 1.5 litres /100 km more using ASS.
    stop start must cause wear and tear. It puts strain on timing chains & starter motors and I also prefer to let the turbo cool down for a bit. Swambo had an X Trail that drove me crazy with its ASS. There again ASS is a good description for it 😃😃
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  3. #43
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by pwgg View Post
    Fuel consumption over 6 months using and then not using for another 6 months. Regular work trip daily. 1.5 litres /100 km more using ASS.
    I did a desktop calc and came to the conclusion that there are savings on my commute but very little as a car uses very little fuel while idling. I seem to recall BMW quoting 0.3l/100km saving.

    I cannot see how it can use more fuel with ASS though, and certainly not 1.5L/100km so there must have been other variables not accounted for.

    More modern systems no longer uses the starter to restart the car so minimal added wear and tear and lot more seamless than older systems. I'm still not a fan of the system but have become neutral with the latest itteration.
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  5. #44
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    Default Re: Is cooling down a TD still a thing?

    It's not about cooling down but rather, slowing down the turbo because if the engine is switched off, the turbo continues to spin at a high speed, but there is no oil feed to it. If I pull off the highway for a refreshment stop, I open a window or door until I hear the engine idle rough like a non-turbo diesel would, before switching off. I once went on a bus trip from Johannesburg to Lilongwe, Malawi and the driver did not once switch off the engine on the route. That is 3 rather slow border crossings one way, immigration and customs clearance for all the passengers, with the engine running. I thought at the time that this was a good standard operating procedure for the bus company because the cost of fuel does not compare to what it would cost to replace turbos damaged by drivers switching off.

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  7. #45
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Ramilayo View Post
    It's not about cooling down but rather, slowing down the turbo because if the engine is switched off, the turbo continues to spin at a high speed, but there is no oil feed to it. If I pull off the highway for a refreshment stop, I open a window or door until I hear the engine idle rough like a non-turbo diesel would, before switching off. I once went on a bus trip from Johannesburg to Lilongwe, Malawi and the driver did not once switch off the engine on the route. That is 3 rather slow border crossings one way, immigration and customs clearance for all the passengers, with the engine running. I thought at the time that this was a good standard operating procedure for the bus company because the cost of fuel does not compare to what it would cost to replace turbos damaged by drivers switching off.
    I think there are a number of things at play here, many (maybe most?) modern cars keep circulating oil to the turbo after engine shut down. With big diesels they certainly don't appreciate stop and start probably for more reason than just the turbo, and I suspect passenger comfort on a bus would also factor into it (aircon is only running if the engine is running).

    All I am saying is I don't think you can draw a direct correlation between a bus (not sure how long ago this was and how old the bus was) and a modern diesel car that is designed to take fairly unskilled (not professional) drivers into account.


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  8. #46
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    Default Re: Is cooling down a TD still a thing?

    I drive a Amarok, BITDI, it's done 470K, never have cooled it down after driving, nothing has failed this far.

    I think technology has changed, better materials, better tolerance and so on.

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  10. #47
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    Default Re: Is cooling down a TD still a thing?

    Also, a 2lt Amarok. 465k and never idled to cool turbos. No problems to date.

  11. #48
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    Default Re: Is cooling down a TD still a thing?

    Well old habits dont die,im still idling mine down after each trip,town slow etc not so much or long driving hard or towing definately.
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  13. #49
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    Default Re: Is cooling down a TD still a thing?

    Oh had a Ford 2.5TD that I bought from a friend with 480K on the clock, speedo had been broken for 3 years before I fixed it. He never let it cool down nor did I, never gave and problems.

  14. #50
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Geiler Keiler View Post
    Oh had a Ford 2.5TD that I bought from a friend with 480K on the clock, speedo had been broken for 3 years before I fixed it. He never let it cool down nor did I, never gave and problems.
    On this one and the Amarok posts, we don't how he, you or erwin is driving. You might be driving civilised.
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  15. #51
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Spiceman View Post
    On this one and the Amarok posts, we don't how he, you or erwin is driving. You might be driving civilised.
    I don't drive like Miss Daisy, my Amarok has REVO software, does 120kw on the back wheels and 500Nm torque, I put foot but don't rev the crap out of it. Works hard as sell, I tow generators, 150KVA, all over SA and install them for a SA restaurant group.

  16. #52
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Commander View Post
    I think there are a number of things at play here, many (maybe most?) modern cars keep circulating oil to the turbo after engine shut down
    .

    This.^^^^

    Designed so that in most cases oil from the oil lines gravity feeds the turbo bearings.

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  18. #53
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Ramilayo View Post
    It's not about cooling down but rather, slowing down the turbo because if the engine is switched off, the turbo continues to spin at a high speed, but there is no oil feed to it. If I pull off the highway for a refreshment stop, I open a window or door until I hear the engine idle rough like a non-turbo diesel would, before switching off. I once went on a bus trip from Johannesburg to Lilongwe, Malawi and the driver did not once switch off the engine on the route. That is 3 rather slow border crossings one way, immigration and customs clearance for all the passengers, with the engine running. I thought at the time that this was a good standard operating procedure for the bus company because the cost of fuel does not compare to what it would cost to replace turbos damaged by drivers switching off.
    i cant imagine the turbo taking too long to slow down with engine at idle, a few seconds maybe?

    could be wrong, im not a mechanic but watched far too many youtube videos with cars with big turbos

  19. #54
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    Default Re: Is cooling down a TD still a thing?

    Ek doen dit nog steeds as ek ver gery / sleep het laat ek my bakkie vir n minute idol dan sit ek hom af

  20. #55
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Spiceman View Post
    Always....since turbos still spin at serious rpm's.

    Quote Originally Posted by Ramilayo View Post
    It's not about cooling down but rather, slowing down the turbo because if the engine is switched off, the turbo continues to spin at a high speed, but there is no oil feed to it. If I pull off the highway for a refreshment stop, I open a window or door until I hear the engine idle rough like a non-turbo diesel would, before switching off. I once went on a bus trip from Johannesburg to Lilongwe, Malawi and the driver did not once switch off the engine on the route. That is 3 rather slow border crossings one way, immigration and customs clearance for all the passengers, with the engine running. I thought at the time that this was a good standard operating procedure for the bus company because the cost of fuel does not compare to what it would cost to replace turbos damaged by drivers switching off.
    It's not about slowing down the turbo.

    It's about cooling the turbo housing so the oil in the turbo doesn't cook, boil and carbon when the engine is switched off and circulation stops.

    The moment your car idles the turbo rpm will reach idle rpm in a second or two.

    High boost turbos usually have engine coolant circulating through it to help with cooling but many turbos are only cooled by the incoming air and the oil circulating through it.
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  22. #56
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Commander View Post
    I think there are a number of things at play here, many (maybe most?) modern cars keep circulating oil to the turbo after engine shut down. With big diesels they certainly don't appreciate stop and start probably for more reason than just the turbo, and I suspect passenger comfort on a bus would also factor into it (aircon is only running if the engine is running).

    All I am saying is I don't think you can draw a direct correlation between a bus (not sure how long ago this was and how old the bus was) and a modern diesel car that is designed to take fairly unskilled (not professional) drivers into account.
    Interesting. Do you know which engines do this? I assume they would need an electrical oil pump to circulate oil after the engine has switched off.

    I know of electrical aux water pumps, but haven't seen an electrical oil pump.

    I would assume that hybrid vehicles would have an electrical oil pump.

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  24. #57
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by Steve45 View Post
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  25. #58
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    Default Re: Is cooling down a TD still a thing?

    As I'm new to the TD market, I'm trying to treat this thing as well as I can. When starting first thing for the day, I usually let it idle for a bit before I take off. I also drive like a grandpa for the most part, don't rev high (a cold diesel sounds "crass" to me and it feels like I'm breaking it), and when I'm done I stop at the gate, open the gate, slowly drive in, into the garage, etc. This also takes a few seconds and it's at idling speed, no throttle even used.

    Anything I should specifically look out for?

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  27. #59
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    Default Re: Is cooling down a TD still a thing?

    Quote Originally Posted by CraigJ View Post
    Is this a real engine
    The French knows how to name an engine

  28. #60
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    Default Re: Is cooling down a TD still a thing?

    How many cases have there been recently of things going wrong when not cooling down a TD and what exactly went wrong?

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