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Thread: terrain response

  1. 20th June 2012, 02:27 PM #1
    irondoc
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    terrain response

    Hi guys, just wanted your input on terrain response. I haven't had my 2011 2.7 D4 for long and was trying to go up a steep slippery grass hill with standard road tyres. I had it in low range mud & ruts.

    I kept getting to a point where there was a ledge, the wheels started spinning and i couldn't go further. I put the brakes on, the car would start slipping back, the ABS would cut in and the car would stall, so i would wait till it stopped, put the car in park, restart it, put it in reverse and go back. It all felt a bit cumbersome.

    Does this sound normal? Should the car have stalled? Should i have had DSC off?

    I would appreciate any comments as i haven't done much offroading in the D4 and my mates have been laughing at me.......

    I realise some decent offroad rubber would help....

    Cheers
    lucas
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  2. 20th June 2012, 03:30 PM #2
    BobD
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    You should have been in rock crawl with DSC on I think. Mud and ruts allows the wheels to spin (for mud) but rock crawl gives you maximum lock up of everything and aggressive traction control.

    Bob
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  3. 20th June 2012, 04:01 PM #3
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    Lotz-A-Landies
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  4. 20th June 2012, 04:21 PM #4
    Celtoid
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    Hey Mate,

    The tyres don't help but I've gone up and down slippery grass and gravel pretty easily on the Wranglers before they got turfed for ATR Scorpions.

    GGS is the first option....Grass, Gravel, Snow.

    Rock Crawl is amazing and would be my second option if the going gets tough....it's got me out of mud and sand bogs.

    DSC....pretty sure I'd be turning it off. Any wiggles or wobbles will cause the brakes to come on....not what you want on a steep ascent.

    GGHaggis on this forum is the king of these machines, he'll give you heaps of advice if needs be.

    Cheers,

    Kev.
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  5. 20th June 2012, 04:59 PM #5
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    gghaggis
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    Quote Originally Posted by irondoc View Post
    I put the brakes on, the car would start slipping back, the ABS would cut in and the car would stall, so i would wait till it stopped
    At this point (if I understand you right), I think you've come up against the laws of physics. No friction = no forward motion. So regardless of what you did with the TR, it's doubtful you'd have made it up on road tyres. Big reduction of tyre pressure and slowly-slowly in RockCrawl (DSC on) would have been your best bet. Assuming you didn't want to launch yourself over the ridge!!

    Cheers,

    Gordon
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  6. 22nd June 2012, 10:18 PM #6
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    wyperfield
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    The 2.7 can stall pretty easily when in Auto up steep hills even when in mud/ruts mode. So I usually start out in low range + command shift 3rd or 4th and change down when you feel the engine struggling at low revs. The D3 will climb most surfaces without any special terrain response.
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  7. 2nd July 2012, 03:16 PM #7
    irondoc
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    I'm feeling much better about the D4 now - went up a little steep muddy, tree-rooted, rutted track on the weekend. The D4 got up pretty easily with a bit of slip-and-slide on road tyres. The Defender 90 behind me took about 5 goes....

    cheers
    lucas
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  8. 2nd July 2012, 03:53 PM #8
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    gghaggis
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    Quote Originally Posted by irondoc View Post
    I'm feeling much better about the D4 now - went up a little steep muddy, tree-rooted, rutted track on the weekend. The D4 got up pretty easily with a bit of slip-and-slide on road tyres. The Defender 90 behind me took about 5 goes....

    cheers
    lucas
    This should justify your feelings! Have a look at a couple of vids from our last training session - first is Defender (on mud tyres) trying a deceptively slippery clay hill:

    [ame=http://www.youtube.com/watch?v=AWC6iI_c-ek]23Jun2012 0016 - YouTube[/ame]

    Next is me on the same hill - Rock-Crawl with all-terrain tyres:

    [ame=http://www.youtube.com/watch?v=-660Y2FXelk]23Jun2012 0017 - YouTube[/ame]

    Cheers,

    Gordon
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  9. 2nd July 2012, 04:08 PM #9
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    Robocop
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    Where was the terrain response on the Defender? I know my Xtreme had it buy I also know its an option these days..

    Rob
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  10. 2nd July 2012, 04:30 PM #10
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    gghaggis
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    Quote Originally Posted by Robocop View Post
    Where was the terrain response on the Defender? I know my Xtreme had it buy I also know its an option these days..

    Rob
    There is no Terrain response on the Defender - it has a pre-set traction control that is approximately set to the level of the on-road TC in a D3/D4/RRS. When one wheel (in this instance the rear passenger) is fully loaded and the other side is completely off the ground, the TC isn't aggressive enough to provide power to the grounded wheel. On slightly shallower wombat holes, it is. The next video in the set shows the Defender's TC working (but haven't uploaded it yet).

    Cheers,

    Gordon
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