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Thread: Turbo Timer

  1. #11
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    Originally posted by fossil
    On a similar subject what are the possible consequences on a turbo diesel of performing a stall recovery on a steep hill i.e.if you can't make the climb, stalling the vehicle, selecting reverse and then starting the vehicle. ... Would this be potentialy damaging to the turbo considering that it is likely that it would have been working hard on the climb and then had the engine shut straight down. I'd be interested in any thoughts.
    Iain
    Hi Iain,
    I wouldn't think it's a problem for two reasons.: 1) The engine would only be stopped for a few seconds - hardly enough time for the 'heat soaking' of the bearing to get going, and 2) even though you may think you engine's working hard in 1st and 2nd low range work, it's really not. The extra low gearing is doing the hard work but the engine's generally not being too heavily loaded. You're very unlikely to be using full throttle at mid to high rpms for minutes at a time in low range - well, not unless you drive a lot different to me.

    High load conditions (full throttle, full boost and mid-to-high rpm), which you often get towing caravans or heavy trailers up a incline, or even solo up a steep range, are the ones that send EGT (and hence the turbo housing temps) very high - to 700 C and beyond if you don't back-off or change to a lower gear.

    Drivesafe, I take on board your recommendation to talk to people who actually service trubo-diesels and do so at every opportunity. But again I must question your assertions. "modern diesel engines and turbos are dramatically different... but both are now designed to operate at much higher RPMs"

    Is the max. rpm of a Td5 that much higher than a 10-year-older-design 200 tdi - not much I think, still about 4500-5000 rpm. AFAIK, typical small high-speed diesel engine turbos still run up around 100,000 rpm but I'll stand corrected if you can quote me some references on this.

    "they are also designed to tolerate higher operating temps" Maybe so, but I thought we were talking about the temperatues the bearing oil is subjected to after a 'hot' turbo is shutdown - something not directly related to the 'operating temps', I would have thought. And again, AFAIK, engine oils, even 'u-beaut' synthetics, don't like being subjected to temperatures above about 140-150 C.

    I think I'll continue to use my turbo timer, with a setting that allows the EGT to settle to the low 200's before stopping. And I'll try Vlads tactic if I'm ever 'ticked' for it...
    Ian &
    Leo - SIII 109/GMH3.3
    Daphne I - '97 Disco 300Tdi Manual
    Daphne II - '03 Disco Td5 Auto

  2. #12
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    Hi again, if you want to use a turbo timer, use it but the facts still remain that of all the 4WDs out there, very few have idle timers of any form, fitted to them and it makes little difference as to what situations they are used in, you just don’t here of any problems now days.
    I had a timer fitted to my 97 disco and once the novelty wore off, I never used it. Most people have little idea if any about what a timer does and as I said, there not having problems.
    So if you like using yours, by all means, use it but all I'm saying is that there is no evidence that anything is achieved by have one or anything is lost by not having one. They just seems a waste of money these days.
    Regards.

  3. #13
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    Turbo timers are still very valid option on turbo vehicles, and more specifically LR actually have a turbo timer within the ECU's for TD5 engined vehicles operating in differant markets.
    After reading about this function on another LR site, I approached LR to have the option turned on. The owners Manual tells you to allow for a cool down period, and I thought it was logical to let the engine do it automatically.
    They explained that although the engines controlled by the foreign market ECU would measure temps and times to achieve a optimum cool down period to avoid oil boil and resultant premature wear, they could/would not do this to an Aussie beast because ADR do not allow it anymore.
    If you contact Garrett and query the need for cool down periods, they will advise that it is still most beneficial to the bearing life. Regardless of the advances made in turbine design, without an appropiate cool down period, you still risk boiling the oil, this will lead to the bearing running without its protective film of oil. the oil can also in severe cases develop a similar effect to glazing which effectively compounds the oil film problem that leads to bearing siesure.

  4. #14
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    Hi folks, you are still missing the point. It makes no difference as to how much data you put forward in favour of using timers. The facts are that most people driving 4WDs today would not have a clue as to what was under the bonnet or how to look after it properly. There still not having problems and from what I have seen over the years, most of the people that put a turbo time on there vehicle only did so without really having any need to do so. If you are operating a heavy vehicle, semi or what ever then there is probably a need. But if you are driving 4WD and you are thrashing the guts out of it then having a turbo timer on it might prolong the inevitable for a while, but I doubt it. The engine is going the develop acute case of stoppage long before the turbo fails.
    As for normal driving, even when towing something, you will usually have to drive slowly for the last few kms as you would have left the high speed areas like the highway or expressway where you might be giving the engine some stick but by the time you do pull up, the engine would have already cooled. On those rare occasions where you would stop immediately after pulling off the highway say to get fuel, you will most likely turn your engine off straight away to allow for fuelling.
    Most drivers go through these situations all the time, why are there not more blown turbos.
    There is just no valid evidence that a turbo timer does anything more than chew up fuel.
    As I said, if you fell more comfortable using a turbo timer, then do so.
    But there is no evidence that having a turbo timer is of any advantage what so ever for normal driving.
    If you know of facts and figures relating to the number of turbos failing verses the number of vehicles fitted with timers that have not failed please correct me but the plain every day facts are that there are tens of thousands of 4WDs out there with no turbo timers and there is not tens of thousands of turbos failing.
    Cheers

  5. #15
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    I quote the owners manual:

    "To avoid the possibility of damaging the turbo-charger bearings (Tdi models) through inadequate lubrication, ALWAYS allow the engine to Idle for 10 seconds before switching off.".....

    I guess this means the engine should run below 1800 rpm for this period of time. Next time you go driving count to ten.

    The Td5 owners manual reads similarly.
    Mahn England

    DEFENDER 110 D300 SE '23 (the S M E G)

    Ex DEFENDER 110 wagon '08 (the Kelvinator)
    http://www.aulro.com/afvb/members-rides/105691-one_iotas-110-inch-kelvinator.html

    Ex 300Tdi Disco:



  6. #16
    VladTepes's Avatar
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    Yeah I have my TT set for 1 minute coz I reckon its silly to leave it for longer - but that's just me. And judging LR's "recommendation" that's just fine.


    Maybe.


    [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]
    It's not broken. It's "Carbon Neutral".


    gone


    1993 Defender 110 ute "Doris"
    1994 Range Rover Vogue LSE "The Luxo-Barge"
    1994 Defender 130 HCPU "Rolly"
    1996 Discovery 1

    current

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  7. #17
    kels Guest
    keep trying Drivesafe - you'll get through eventually!

  8. #18
    VladTepes's Avatar
    VladTepes is offline Major Part of the Heart and Soul of AULRO Subscriber
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    Well I wouldn't call my '93 build diesel 'modern'.
    It's not broken. It's "Carbon Neutral".


    gone


    1993 Defender 110 ute "Doris"
    1994 Range Rover Vogue LSE "The Luxo-Barge"
    1994 Defender 130 HCPU "Rolly"
    1996 Discovery 1

    current

    1995 Defender 130 HCPU and Suzuki GSX1400


  9. #19
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    Give it up one iota,,,, Landrover , Garret, 8O ,,, what would they know :? .

    Drivesafe knows just how many turbos blow up each day. :roll: TIC

  10. #20
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    The bloke next door has a GU 3L Nissan with less than 60k on it and it is on it's second Turbo. The car is a 2002 model I think and he never letts it run down and it has no timer. Lucky it has 3 year warrenty.

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