Central Diff.

[wisey110]

Can some one explian how it works for me don't really understand. Old boy had ago at but i got lost. :eek:

[Scouse]

It allows the front & rear wheels to turn at different speeds, say when going around corners. The front wheels have to travel further than the rears in that case & the centre diff "slippage" action allows for that.

However, because of the "slippage" the centre diff allows, it means you can come unstuck when off road. If one wheel loses traction, the centre diff will slip & all you'll have is the wheel without traction spinning hopelessly.
Locking the centre diff locks the front & rear propshafts so power is sent to both ends of the car. If one front wheel lifts, you'll still have power to the rear.

Hope that helps.

[one_iota]

Basic but good explanation:

HowStuffWorks "How Four-Wheel Drive Works" (http://auto.howstuffworks.com/four-wheel-drive.htm)

[procrastination inc]

http://en.wikipedia.org/wiki/Differential_(mechanical_device)

[wisey110]

So what happens when you say, have left front and right rear off, how is the power sent then?? does the power go to the other wheels on the ground or are you stuffed because you have only 2 wheels on the ground(the ones in the air spin)?

[spudboy]

If you get one wheel on each axle in the air than you are back to zero wheel drive.

That's why they invented LSDs and Lockers :D

[Scouse]

Yep, it's called "cross axled". A LR has a fair bit of wheel travel though so you'll still get through what the Toyotas get stuck in :).

Usually a bit more momentum will get you through if you do get 2 wheels in the air.

[austastar]

Yep, it's called "cross axled". A LR has a fair bit of wheel travel though so you'll still get through what the Toyotas get stuck in :)

Here is a Toyota cross axled on the ARB demonstration rig.

https://www.aulro.com/afvb/

The rear right and front left tyres are left hanging and have no traction.
The T has no centre diff, so it is effectively the same as the centre LR diff in locked position.

To continue driving, it was necessary to engage the lockers in the front and rear differentials.

[wisey110]

Ah ok cool, i crossed axled my dads 130, trying to get it stuck and to see the travel it had. hints the questions. I chose low gear 1st NO throttle to do this(i know to get over it use the throttle) chose a dirty big rut in our gravel pit, it got hung up. With diff lock it got across. another question i guess you could add to that is how well does the TC work on the 110, i'm getting one in few weeks, thought this would be a good test for it to work out lockers or not.

[austastar]

how well does the TC work on the 110, i'm getting one in few weeks, thought this would be a good test for it to work out lockers or not.

Not a clue, don't drive a landy (yet) but I gather traction control will apply the brake to the freely spinning wheel, forcing power back through the differential to the wheel with some traction.
If you have ever driven a tractor (old one maybe) that has a left and right brake pedal, you will have already used the principal.

cheers

[slug_burner]

TC works very well. On my D2 I lifted a wheel when doing a u turn as I rode up the enbankment. Did not even need to engage CDL as the TC took over and still allowed the other wheels to put power to the ground.

[austastar]

TC works very well. On my D2 I lifted a wheel when doing a u turn as I rode up the enbankment. Did not even need to engage CDL as the TC took over and still allowed the other wheels to put power to the ground.

Good to know that, but I don't think I can get it on the Defender 130 Cab Chassis I'm looking at getting new. I was thinking I would have to get ARB lockers, is this correct?
cheers

[wisey110]

Not a clue, don't drive a landy (yet) but I gather traction control will apply the brake to the freely spinning wheel, forcing power back through the differential to the wheel with some traction.
If you have ever driven a tractor (old one maybe) that has a left and right brake pedal, you will have already used the principal.

cheers
mate i'm a farmer and i don't think i've done that before. unless your talking about when you do tight turn then i understand. All the power goes to the outside wheel making it turn on the spot, after you hit the inside brake hard.

[JDNSW]

mate i'm a farmer and i don't think i've done that before. unless your talking about when you do tight turn then i understand. All the power goes to the outside wheel making it turn on the spot, after you hit the inside brake hard.

I use the principal regularly on the tractor (with a blade), although not when cross axled - tractors rarely get cross-axled, as in most cases (conventional rwd or fwa) the weight bias is so heavily on the rear wheels that it will never lift a rear wheel except as you go over. But as you lose traction, one wheel will start to spin first, and brake on that wheel will sometimes save the day.

John

[wisey110]

should of added in my last bit when you hit the inside brake. Still would of never thught that would work till now. All ours are 4WD with diff lock never get stuck

[buzz66]

Here is a Toyota cross axled on the ARB demonstration rig.

http://myswag.org/gallery/d/6996-1/ARB+stuck.JPG

The rear right and front left tyres are left hanging and have no traction.
The T has no centre diff, so it is effectively the same as the centre LR diff in locked position.

To continue driving, it was necessary to engage the lockers in the front and rear differentials.

Check it out! has thousands of dollars of extra weight **** hanging off it and it still wont go!

[carjunkieanon]

If you have ever driven a tractor (old one maybe) that has a left and right brake pedal, you will have already used the principal.

cheers

Or you can use left and right brakes to steer when a big weight on the rear tray lifts the front wheels in the air. Done that a bit, but not terribly wise.

[austastar]

Or you can use left and right brakes to steer when a big weight on the rear tray lifts the front wheels in the air.

That would be terrifying.

cheers