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Thread: prolonged use of hill descent control

  1. #1
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    prolonged use of hill descent control

    Hi, Just a quick question regarding the prolonged used of HDC, i will be towing a off-road camper trailer that will be fully loaded up (it does not have brakes), we will be going to a camp site called west Kunderang in the wild oxley rivers NP, near Armidale, i am told that to get down to the valley there is a fairly steep long sections of downhill to negotiate,

    My question is do i continue to use HDC and low range auto, or should i disengage HDC and engage 1st gear low range and use the brakes in short sharp bursts to stop over heating?

    I there a chance of HDC over heating brakes?

    Thanks Pat

  2. #2
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    I'd be doing both. That way HDC will only kick in when required.

  3. #3
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    disregarding the HDC for a sec,,
    The D2 has an issue with lack of revs and the Torque Converter,,
    no revs = no lockup = runaway car!
    all can be averted by actually driving the car downhill, but not sure just how tricky the new command shift box is,,,

    anyone?
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  4. #4
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    Why do you have an offroad camper with no brakes fully loaded it will be over 750kg, that is the problem, not the HDC.

    Give the car a rest every now and then, might take a bit longer to get to camp, but it might save some arse pucker moments as well, if the track is as steep and long as people would say, on most trips we have done, the steepness of tracks comes down to the experience of the person doing them, what one person calls steep another might think it's not.

    You will work it out once your there, I would imagine.

    Have fun, Baz.
    Cheers Baz.

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  5. #5
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    Quote Originally Posted by Pedro_The_Swift View Post
    disregarding the HDC for a sec,,
    The D2 has an issue with lack of revs and the Torque Converter,,
    no revs = no lockup = runaway car!
    all can be averted by actually driving the car downhill, but not sure just how tricky the new command shift box is,,,

    anyone?
    Sorry. I know it's off topic.

    I have experienced what you describe and certainly it gives the heebeegeebees

    Keeping it in low 1st will at least ensure that revs are maintained at a higher level. But then you need to keep an eye on the temperature if it is for a long time.
    Alan
    2005 Disco 2 HSE
    1983 Series III Stage 1 V8

  6. #6
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    Quote Originally Posted by Pedro_The_Swift View Post
    disregarding the HDC for a sec,,
    The D2 has an issue with lack of revs and the Torque Converter,,
    no revs = no lockup = runaway car!
    all can be averted by actually driving the car downhill, but not sure just how tricky the new command shift box is,,,

    anyone?
    Quote Originally Posted by disco2hse View Post
    Sorry. I know it's off topic.

    I have experienced what you describe and certainly it gives the heebeegeebees

    Keeping it in low 1st will at least ensure that revs are maintained at a higher level. But then you need to keep an eye on the temperature if it is for a long time.
    I'm pretty sure the D3/D4 doesn't do this, the D3/4 has an adjustable HDC, to as low as 3kph.

    Also you can't compare the D3/4 with the D2, they are vastly different vehicles.

    Baz.
    Cheers Baz.

    2011 Discovery 4 SE 2.7L
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  7. #7
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    Quote Originally Posted by Redback View Post
    I'm pretty sure the D3/D4 doesn't do this, the D3/4 has an adjustable HDC, to as low as 3kph.

    Also you can't compare the D3/4 with the D2, they are vastly different vehicles.

    Baz.
    Fair call. I don't think Pedro's intention was to compare the vehicles, it certainly wasn't mine. That's why I apologized for the off topic post.
    Alan
    2005 Disco 2 HSE
    1983 Series III Stage 1 V8

  8. #8
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    The HDC is one of those things that's hard to trust but does work very well. I'd be trusting it for sure but the weight of the trailer pushing you down will be concerning if it has no brakes but I presume it does have at least hydraulic brakes like most good off road campers because that should definitely assist you as long as the incline doesn't create excessive drag.

    Personally I'd go for HDC while watching temps and monitoring for undesired 'noises & smells' with the window down while watching for pullover spots after the first hundred meters or so.

    Sounds like a great trip.

  9. #9
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    Mate - I dont have this vehicle, but principles are the same. Always the lowest gear - so low range first where its steep. Then bring about assistance of HDC - ie use both.

    Cheers

  10. #10
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    In the D3 the HDC is fully adjustable but is not very smooth and gets uncomfortable - as soon as you do something else in the car like speed up, change range etc the HDC goes back to its highest speed setting so you have to bring the hdc speed back down.

    I have found command shift (1st/2nd), low range far superior to HDC. I am not sure whether the TC locks up in these circumstances but if the correct gear is selected you have full engine braking and rarely need to use the brakes (remembering HDC is a brake based system).

    So I would be using the gears in command shift and if for some reason that is not good enough then use HDC but it is a bit rough.

    Garry
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