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  #1  
Old 12-12-06, 09:56 AM
davetapson davetapson is online now
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Default 4WD engaged on dirt roads?

This is a subject that has been done to death - personally I engage 4wd on dirt roads for a couple of reasons:
1. better vehicle control
2. less damage to driving wheels as drive is spread from 2 to 4 wheels
3. less damage to road - esp sand tracks etc etc

However, a couple of times down in the E. Cape I found that I was flung out of the corner when turning sharp corners - seemed to be worse on steeply banked corners.

I think it may be due to axle wind up due to the sharp corner (these are like 90 deg on narrow roads / tracks) exacerbated by the fact that I have cooper stt's fitted. They don't slip to relieve the windup until large forces are built up - then BOING - you get fired out of the corner on the outside.

Has anyone else experienced this?
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Old 12-12-06, 10:45 PM
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My vehicle is very short and light, so if I don't use 4x4 on gravel I lose the back end VERY quickly. Steering may be heavier but it should not fling you out of a corner though. I could understand what you describe if you had lockers engaged.
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Old 13-12-06, 09:32 AM
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For dirt/gravel it's very easy to test and prove to yourself. Find a large patch of gravel (somewhere where you can play!).

Vehicle in 2wd, turn the wheel full lock, floor it. See what happens.

Now do the same in 4wd, you will see the results in vehicle control is completely different. In 4wd you will get a sideways drift, in 2wd it will just be plainly out of control.

When I still drove the Paj petrol and had speed I use to only use 4wd on dirt, and going through corners you could really floor it.

One of our members here, Ralph, will be able to really give much more info!
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Old 13-12-06, 11:02 AM
Derren
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Wouldn't there be a bit of a difference between the Pajero and a bakkie in it's handling?

When the Pajero is in 4x4 is the center diff locked? because it will be for a bakkie in 4x4.
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Old 13-12-06, 11:16 AM
4ePajero
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Derren,

On the Mitsubishi Super Select, the centre diff is not locked in 4H.

Should the driver select 4HLc, the centre diff is locked.

All this happens "on the fly".




Dave's symptom sound typically like locked diffs. The auto-locking diffs tend to do this - lock the diff when you least expect it and "pitches" you off the road faster than you can respond.
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Old 13-12-06, 11:25 AM
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Quote:
Originally Posted by 4ePajero View Post
Derren,

On the Mitsubishi Super Select, the centre diff is not locked in 4H.

Should the driver select 4HLc, the centre diff is locked.

All this happens "on the fly".

Important you cannot go to 4HLc on the fly, you HAVE TO STOP! (Been there done that did the damage!). You can only shift to 4H (4wd high range) on the fly, below 80km/h
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Old 13-12-06, 11:34 AM
4ePajero
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Brain fart!

amaDisko is 100% on the 4HLc switching!
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  #8  
Old 13-12-06, 12:13 PM
davetapson davetapson is online now
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It feels like a locked diff - but my diffs don't lock automatically - gotta press a button. (the standard hilux 2.7 difflock)

And it only happens now and then, whereas if the diff was locking it would happen more often?

I myself when it happens... :0
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  #9  
Old 13-12-06, 12:30 PM
Derren
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But your center diff will be locked - presuming you are talking about your Hilux...

So when you go around a corner your back wheels and front wheels will travel different paths so you will get a windup between the front and the back and it is made worse with sharper turns where the travelled path is much more different.
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Old 13-12-06, 12:52 PM
davetapson davetapson is online now
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Yep - for sure. I think it's the wind up not being released because of the traction of the STT's that's causing it. I suspect that if I had less aggressive tyres, one would slip before too much wind up happened, and the effects of the wind up would be less spectacular - probably unnoticable?

Last edited by davetapson; 13-12-06 at 12:56 PM.
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