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Thread: Hill Descent Slipping

  1. #1
    solmanic's Avatar
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    Hill Descent Slipping

    I was doing a pretty steep hill descent on the week-end, maybe 35% but that might be wishfull thinking on my part (they always feel steeper than they actually are). I automatically assumed that low-low was the only way to go but on the steepest pinch I noticed that the wheels were slipping. The auotomatic 80 series 'Cruiser and Jackaroo SE Deisel with me said they had no slippage but they would have been coming down much faster without the same engine or transmission braking as me - should I have just been going a little faster? (I was lust letting the vehicle idle down).

    My tyres are just standard General Grabbers and the other two vehicles had slightly more agressive AT tread. The track surface was just dry dirt & stones - no big rocks or anything. The steepest pinch was over a woah-boy so I guess it could have been even steeper than I thought. I always make fun of people with those little inclinometers stuch to their dashboard but now I wish I had one so I know how steep it actually was.

  2. #2
    Martin Guest
    If they were going a little faster, than it would make sense they did not slip given the terrain. DON’T attempt to drive faster down, but if you do loose traction (and I know this feels counter intuitive – but is the right thing to do) blip the accelerator a little (and I mean a little if you are in low range), which should help you regain traction, once the wheels meet the speed of the vehicle. It is much safer than slipping to the bottom, as you can’t steer if you are slipping. negotiating steep descents is all about control, and the faster you go, the less you have!

    Steep descents on Sand dunes are a great place to practice this. After all, you really need to know how much to blip that throttle, and when you are in low range 1st, that may not be much at all. Better to learn how the car responds in a controlled environment. However the car will behave differently on rock descents - the idea is only to get to know how the vehicle responds to accelearation when you are slipping on a steep decline. You will still need to use your judgement when driving.

    Same goes for slippy muddy descents too – blip the throttle when you loose traction. Once regained, leave the car to do the work.

    J

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    You have alot stronger engine braking than the vehicles mentioned,Ive also had the same prob in my Disco.Re did a run in second low no probs at all,BUT a tad too fast for my liking.
    As Martin pointed out the correct method is to apply a LITTLE power to regain traction.
    Andrew
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    ahhhh I see the problem, As I have found out the branding of the default tyre on the 03 extreme very misleading...

    General Grabber My ass....

    General slippers would be more like it.. Ive had the nasty feeling of traction being just a fleeting memory even with the TC doing its damndest to keep it under control. IMHO They're ok on dry black top and sand but other than that you may as well have racing slicks on

    Cant wait to finally wear the buggers down to the point where they have to be replaced... a set of maxxis or BFG AT/MTs for me thanx
    Dave

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    Quote Originally Posted by Blknight.aus
    ahhhh I see the problem, As I have found out the branding of the default tyre on the 03 extreme very misleading...

    General Grabber My ass....

    General slippers would be more like it.. Ive had the nasty feeling of traction being just a fleeting memory even with the TC doing its damndest to keep it under control. IMHO They're ok on dry black top and sand but other than that you may as well have racing slicks on

    Cant wait to finally wear the buggers down to the point where they have to be replaced... a set of maxxis or BFG AT/MTs for me thanx


    if you dont rotate your spare into the equation.....you should get around 80,000kms out of them.....more if you drive easy.....

    and i would have to say....for what they are...they are a very good tyre.....
    but you really need to air down for them......
    thats all ive ever had on lurch.....and theyve gotten me as far as everyone else on the trips.....

    and i dont think you can beat them on the black stuff........

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    We have at times lightly applied the brakes in this sort of situation and regained control. You do not want to lock them up or else you are in all sorts of trouble.

    We did one very steep hill where we had the rev counter on 400rpm as we were on the brake pedal so much. There was too much slipage when in low low only and the hill went on forever so we did not want to increase speed at all.

    I normally like to take it slow and easy, even if I am on the brakes lightly.

    Very slippery slopes eg wet clay are another story, you just go for a ride and enjoy it if you can with slight accelerator if reqd. and if your speed gets too high like it did for us on one hill, we found luckily an escape track half way down that we stopped on, then reversed back and started downhill again with a lot less speed.

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    Quote Originally Posted by DEFENDERZOOK
    if you dont rotate your spare into the equation.....you should get around 80,000kms out of them.....more if you drive easy.....

    and i would have to say....for what they are...they are a very good tyre.....
    but you really need to air down for them......
    thats all ive ever had on lurch.....and theyve gotten me as far as everyone else on the trips.....

    and i dont think you can beat them on the black stuff........

    Hrmmm Yeah the tyre pressure thing is a good point and they are good on the black stuff, I love em under brakes not real keen on the sideways grip tho. mine are at 65k km ish and look like they have about 40 maybe 45% left to go and Im confident that If I look after em a bit more they might just make the 100k mark before MR plod says they gotta go.

    Tell ya what, IF you like em you can buy em off me and I'll put your donation towards the cost of my prefered rubber. I'll chuck ya the spare for nix if ya like...

    Seriously tho If anyone wants the spare when I goto my new rubber its yours so far it hasnt even sniffed the ground except when I pull it off to clean out the race in the mag and/or use it as a shower matt/impromptu seat.

    If i can find the rubber I want at a price I like the rubber change will happen this year after tax debacle is sorted.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
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    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  8. #8
    solmanic's Avatar
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    I had kind of overlooked the tyres in this. Certainly the other two vehicles were on wider rubber and fortunately it was only on the steepest pinch that the slipping occurred. I didn't let any air out either as we were mainly just forest driving.

    80K from a set of tyres is OK - only I had trouble with an ultra-long lasting set of tyres on my other car which just got too hard over time even though they still had stacks of tread left. It was like driving on ice-skates. I only hope that I can get all FIVE tyres suitably worn out when I go to replace them or else I'll just end up putting Grabbers back on since I'm such a tight-ass and won't want to throw away the spare.

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    Silly question, but did you have CDL on?

    Cheers,
    Simon

  10. #10
    solmanic's Avatar
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    I choose not to answer that on the grounds that I might incriminate myself.

    ...like I said, we were doing mainly forest driving and just thought to take this steeper track. When we hit the steepest pinch I was not expecting the slippage so I didn't bother (the others were fine). It was dry, easy and downhill after all so losing traction was a bit of a surprise.

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