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Thread: Tdv6 vs sdv6

  1. #1
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    Tdv6 vs sdv6

    Does anyone know the difference in these two engines and can explain it to a layman like myself?

    the sdv6 appeals to me because it has 700nm instead of the 600nm the tdv6 but what concerns me is have they stretched the same engine to get that extra power and therefore is that possibly going to make it less reliable?

    i clearly have no idea of the inner workings to this stuff so feel free to correct my logic

  2. #2
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    My understanding is that in the Disco 5, they are the same engine just at a different level of tune.
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  3. #3
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    The update 225kw 700nm is twin turboed.
    Cheers

    Chuck

    MY 23.5 P300 110 Defender with Ediff & ATPC
    MY 21 76 Series Landcruiser
    Ex D1, D2, D2a, D3, D4, Prado, D4, D5,
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  4. #4
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    And so is the lower powered version.

    It is only the US Ford Duramax version that is single turbo.

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  5. #5
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    Quote Originally Posted by 101RRS View Post
    And so is the lower powered version.
    The workshop manual disagrees - I have a TD6 and enough space under the bonnet to fit an air compressor where the SD6 has a second air intake box. I thought that was for the second turbo.
    This is from the 2018 TD6 workshop manual:

    Screen Shot 2020-09-02 at 7.51.33 pm.jpg

    Ron
    2016 D4 TDV6 Corris Grey
    --------------------------------------------------------
    2018 D5 TD6 SE Silicon Silver - gone
    2011 D4 TDV6 2.7 Indus Silver - gone
    IIDTool BT

  6. #6
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    Quote Originally Posted by IndusD4 View Post
    The workshop manual disagrees - I have a TD6 and enough space under the bonnet to fit an air compressor where the SD6 has a second air intake box. I thought that was for the second turbo.
    This is from the 2018 TD6 workshop manual:

    Screen Shot 2020-09-02 at 7.51.33 pm.jpg

    Ron
    I certainly agree that is pretty persuasive but if you actually google Discovery 5 TDV6 it always comes up as the earlier TD6 (190kw/600nm) sequential turbo engine. If you google Discovery 5 SDV6 it always come up the later TD6 (225kw/700nm) sequential turbo engine.

    Other than the US Ford Powerstroke engine, I dont see any reference to a single turbo in the 3.0 V6 diesel engines.

    Though not authoritative wiki has both LR SD6 engines as sequential turbos. Ford AJD-V6/PSA DT17 - Wikipedia

    However what is clear is that the engines were not generally fitted to the D5 at the same time - it would seem the 190kw V6 engine was fitted to the D5 in the first years and now it has the 225kw engine is fitted to later models - not sure if there was much of a cross over period.

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  7. #7
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    Hi Garry

    I've always thought the 'S' in SDx was for sequential, therefore a SDV6/SD4 would be a twin turbo and a TD6/TD4 (or even TDV6 in a D4) a single turbo. At least in Australia / Europe. As for google, it is hard sometimes to find the answer which may be due market differences in these vehicles.

    Ron
    2016 D4 TDV6 Corris Grey
    --------------------------------------------------------
    2018 D5 TD6 SE Silicon Silver - gone
    2011 D4 TDV6 2.7 Indus Silver - gone
    IIDTool BT

  8. #8
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    Yes I agree but what confused matters was back with the D4 - in early D4s the TDV6 was the 2.7 (single turbo) and the SDV6 was the 3.0 sequential twin turbo. But when the 2.7 was dropped the TDV6 badge went to the low power 3.0 sequential twin turbo (155kw?) and the SDV6 stayed with the high power (180kw) diesel - hence the start of the confusion.

    Now to the D5 - despite google no clarifying the issue I agree the earlier 3.0 TD6 (190kw) was single turbo. While some people may us the terms TDV6 and SDV6 with respect to the D5 - the correct term is TD6 or DTV6 (very early on) or SD6 currently (more confusion). So the TD6 can refer to the single turbo engine early on or the sequential turbo later on or the later can also be a SD6 .

    So the OPs original question - forget TDV6 or SDV6 or TD6 or DTv6 or SD6.

    The single turbo 3.0 diesel was fitted to D5s up to about late 18 early 19 (not sure of the change). This was the engine that had the oil dilution problem and can break crankshafts - is lower power and torque as you have noted.

    The later twin turbo 3.0 diesel has 225kw of power and 700nm of torque - does it too break crankshafts - no idea. The US Powerstroke Engine has been out for about 2 years and has a different crank and bearings - no idea if this fixed the crank breaking issue or whether this crank has been put into the newer Land rover engines.

    It seems (and I am not sure) you cannot pick and choose which 3.0 diesel you wanted in your D5 - it came with whatever year model you bought.

    The confusing, and constantly changing engine naming process makes things as clear as mud - starting back with the D4.

    This is doing my head in
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  9. #9
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    Agreed, LR muddied the waters with the D4 TDV6 2012 onwards.

    As for the original question, in the D5 the td6 is a single turbo 190kw/600nm engine and the sdv6 is a twin turbo 225kw/700nm engine.
    Also true, you can indeed not pick your engine output other than by selecting a later model year (MY19 ->).

    Ron
    2016 D4 TDV6 Corris Grey
    --------------------------------------------------------
    2018 D5 TD6 SE Silicon Silver - gone
    2011 D4 TDV6 2.7 Indus Silver - gone
    IIDTool BT

  10. #10
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    Clear as mud indeed. I appreciate that explanation

    so, to my second question I presume the jury is still out on the most reliable of the two?

    Is the oil dilution problem fixed for existing early models? Or is that still an issue for those cars which needs to be looked out for? (Understand it’s fixed for 2019 onwards).

    i can’t afford a 2019 D5 unless I wait another year

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