| Author |
Message |
    
A.W. (A_W_Disco)
| | Posted on Sunday, June 16, 2002 - 11:31 am: | 
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Hi, I have a 95 disco v8i and I was wondering if someone can answer this question.
Under normal driving conditions, is the 4 wheel drive system should be kept all the time at "4-low"?
It made more sense to me that it should be kept at "4-Neutral" all the time, but when I attempted this, my car didn't move at all (my regular automatic transmission would not engage at all, and would act as if it's also on "Neutral"), is that normal? |
jim
| | Posted on Sunday, June 16, 2002 - 11:39 am: |
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You want to have it in 4-hi unlocked. |
A.W. (A_W_Disco)
| | Posted on Sunday, June 16, 2002 - 11:45 am: |
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Thanks but what do u mean by "unlocked",how do u lock it or unlock it? |
jim
| | Posted on Sunday, June 16, 2002 - 11:56 am: |
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What I mean by this is that when you are in low locked you are distributing the power evenly between front and rear and when you are unlocked you are distributing most of the power to the rear and less to the front. The red arros is pointing to where you should be for regular driving.
/image{cdl.jpg} |
jim
| | Posted on Sunday, June 16, 2002 - 11:57 am: |
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sorry here is the image  |
A.W. (A_W_Disco)
| | Posted on Sunday, June 16, 2002 - 12:05 pm: |
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Thanks Jim, I appreciate it. |
jp
| | Posted on Monday, June 17, 2002 - 06:36 am: |
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SOME OF THIS ONLY APPLIES TO D1, not to all D2s.
These cars are ALWAYS sending power to ALL 4 wheels. Each axle has a diff to allow one wheel to move more than the other (going round a corner, outside wheel has further to move than inside one). Also, the centre transfer case has a diff to allow one axle to turn faster than the other - eg one in loose stuff, other on good grip. This situation can sometimes mean you will send all the power out one wheel, and go nowhere, therefore a centre diff lock is provided to ensure that some power goes to both axles. This Lock should ONLY be used on loose surfaces - it can be VERY expensive to use it on a sealed road, as there is always some difference in axle speeds, and they will lock up badly.
Normal driving should be in 4High Unlocked, moving to locked if you lose grip and get stuck, then to 4 Low locked if you get very stuck.
jp |
Frode H�bertz Haaland (Discofrode)
| | Posted on Monday, June 17, 2002 - 06:58 am: |
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There's an excellent article on this site to help you understand the system:
Go to "Discovery" -> choose "Basics"
This is the direct link:
http://www.discoweb.org/discovery/basics.htm
Frode |
Al Oliveira (Offroaddisco)
| | Posted on Monday, June 17, 2002 - 04:00 pm: |
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jp,
I hope you carry lots of recovery gear if you wait to get stuck before you go to 4LLc. =)
AW - I think what jp is trying to say is keep it in 4H unlock on all paved roads. If you run into snow covered roads then go into 4 high lock. (NOTE SNOW COVERED ROADS NOT PAVED ROADS IN THE SNOW) If you get into most real off road trails you should get into 4 low and in most cases lock it unless you KNOW there is no chance of getting stuck and you're on loose dirt or gravel. Just remember to unlock the diff before hitting the pavement and switch back to high range. And read Frodes link and your manual (RTFM). Don't be link the goofball in the magazine (Autoweek?) who decided to see what the G-Wagen would be like with the diff locked on the paved road. (I can't believe they even printed that they tried it!) |
B.Bailey
| | Posted on Monday, June 17, 2002 - 08:36 pm: |
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Your Disco is in Permanent Four Wheel Drive. You have the option of a Low or High gearing range for better low speed towing and for off roading. You actually have 3 differentials in your truck, one on each axle, and one in the middle "axle" or drive train between the two axles. They all do the exact same thing.
The problem with a Diff is that power from the engine will always follow the easy path. If one wheel slips, the friction from on that wheel is suddenly reduced, therefore, the power from the engine follows that path and the wheel just spins while the other three wheels are not getting any power. This is because the Diff will always allow the two wheels or two axles to spin at different speeds (even in different directions!) But if you could lock or partially lock a differential you would always have the same amount of available power going to each wheel on that axle. Well, that is what the "Diff Lock" part of the selection is for. You have the option of Locking the center differential in your truck. This means that both axles will always get equal power from the engine. However, you cannot lock the axle differentials. So, when one wheel slips, you will loose power to the opposite wheel. However, because you have the Center Diff locked, you will still be getting power to the other axle. You can buy aftermarket locks or partial locks for the axle differentials. But go get some mud on your car first, then spend the extra $500 - $1000 bucks on other locks.
In the mean time, use very gentle left foot braking when you feel the car slipping on a hill climb or in mud. This gives the slipping wheel a sort of "artificial" traction. (The friction makes it "think" it is still in contact with the ground.) I have found that with a little practice, you can actually give yourself some 25% - 30% more traction in some situations!!
Also, read a lot. Search the Internet for tips on driving. Go to my web site and look at some of the links. There is one that has a whole series on off-road driving. The more you learn about your car the safer and better you will be off road.
http://landrover.mrbaileyshistory.net |
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