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  #13  
Old 12-30-2013, 06:24 AM
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Re: 4WD behaviour

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Originally Posted by f1anatic View Post
Take a look at this video, with emphasis on the Quadra Trac II equipped WK2.



When I first purchased the Jeep, I was expecting the Jeep's 4WD system to work more like (mechanical limited slip differentials) but actually it doesn't. It is the ABS involvement that creates this jerky behavior of crawl forward - brake the spinning wheel(s)- torque transfer along the same axle - crawl forward and ...repeat...

And if you look at , you will see that even Quadra Drive 2 equipped vehicles (rear E-LSD) suffer from the same "hopping" behavior when it comes to navigating over obstacles.
So what IS the claimed benefit of electronically controlled 4WD traction systems vs mechanically locked diffs all 'round?? Cost of manufacture? Ease of use?
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  #14  
Old 12-30-2013, 09:01 AM
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Re: 4WD behaviour

For me, I was just shocked in the loss of traction, I guess it is a tyre thing.

These pics weren't taken for this purpose, but it will show the area I got and still get wheel spin.
At first we noticed it when reversing an empty horse float into the shed. The grass was moist. But it has then happened several times since. Reversing or going forward, and not towing, car only.





As you can see, nothing particularly steep or menacing about that grass slope. My RWD sedan doesn't lose traction here and spin a wheel.
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  #15  
Old 12-30-2013, 09:42 AM
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Re: 4WD behaviour

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Originally Posted by lt4vette View Post
So what IS the claimed benefit of electronically controlled 4WD traction systems vs mechanically locked diffs all 'round?? Cost of manufacture? Ease of use?
Among the list of arguments, one must definitely include cost savings and reduced complexity (increased reliability). I've read somewhere that for WK2, the front E-LSD was dropped because it did not offer any added benefits.
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Old 12-30-2013, 10:24 AM
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Re: 4WD behaviour

You definitely have some weight and tire playing a roll in slipping on wet grass vs. the sedan (unless its an old school caddy). Would be interesting if you used snow/mud/sand if there is a difference in wheel spin. In snow, sand, mud, and rock the center diff is locked 50/50 between front and rear.
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Old 12-30-2013, 06:31 PM
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Re: 4WD behaviour

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Originally Posted by TurboRush View Post
You definitely have some weight and tire playing a roll in slipping on wet grass vs. the sedan (unless its an old school caddy).
Never had the issue with my last 4WD, though either. So probably more so the tyres.

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Old 12-30-2013, 10:06 PM
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Never had the issue with my last 4WD, though either. So probably more so the tyres.

Knowing that, I'd agree...
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Old 12-31-2013, 06:44 PM
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Re: 4WD behaviour

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Originally Posted by lt4vette View Post
So what IS the claimed benefit of electronically controlled 4WD traction systems vs mechanically locked diffs all 'round?? Cost of manufacture? Ease of use?
What do you mean by mechanical locked? The ones you throw a switch and they lock, or the mechanical limited slip where wheel spin difference drives a pump that activate clutches that clamp the axle together?

If you are talking manual controlled lockers, the electronically controlled ones are much safer and can be activated by the computer at any time.

In the second case, the mechanical limited slip is slower and less effective.

The most significant advantage is in SRT applications where when the driver stomps the throttle, the diff locks up before any wheel spin and thus provides far superior launches.

A few years ago there were a couple member here that owned both the older WK Overland and the newer, and the WK2 traction was a bit better with less wheel spin and quicker action. There were also a couple that drove near identical WK2s with and without QD and the less QD wheel spin was noticeable on gravel roads and snow. If I wasn't so lazy I'd search the forum for you
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  #20  
Old 12-31-2013, 06:46 PM
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Re: 4WD behaviour

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Originally Posted by ColdCase View Post
If I wasn't so lazy I'd search the forum for you
That is pretty lazy, it's not like there are many posts to search through.
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  #21  
Old 01-01-2014, 02:21 PM
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Re: 4WD behaviour

Quote:
Originally Posted by ColdCase View Post
What do you mean by mechanical locked? The ones you throw a switch and they lock, or the mechanical limited slip where wheel spin difference drives a pump that activate clutches that clamp the axle together?

If you are talking manual controlled lockers, the electronically controlled ones are much safer and can be activated by the computer at any time.

In the second case, the mechanical limited slip is slower and less effective.

The most significant advantage is in SRT applications where when the driver stomps the throttle, the diff locks up before any wheel spin and thus provides far superior launches.

A few years ago there were a couple member here that owned both the older WK Overland and the newer, and the WK2 traction was a bit better with less wheel spin and quicker action. There were also a couple that drove near identical WK2s with and without QD and the less QD wheel spin was noticeable on gravel roads and snow. If I wasn't so lazy I'd search the forum for you
By mechanically locked I mean I mean by switches. On my Landcruiser I can push a button to lock the centre diff (or it locks automatically in Low Range), or lock the rear diff only, or both the front and rear diffs. I agree that forgetting the front diff is locked can be exciting!
It just seems to me that the computer requiring wheel slip to activate a lock results in a jerking forward motion - slip/grip, slip/grip etc. At least that's how my QD is behaving under at least some conditions. But you mentioned earlier that with the ELSD, it should lock with throttle application and no need for wheelspin - so I will get the transmission checked out when I take the car in for a recall on Friday.
One thing which may be related that I don't understand, is the interaction between the ELSD and the braking of an individual wheel when it loses traction. It certainly feels more like a wheel being braked/released, braked/released, than a progressively controlled diff lock. Or is the wheel braking technique disabled when an ELSD is present?
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Old 01-01-2014, 04:24 PM
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Quote:
Originally Posted by TurboRush View Post
You definitely have some weight and tire playing a roll in slipping on wet grass vs. the sedan (unless its an old school caddy). Would be interesting if you used snow/mud/sand if there is a difference in wheel spin. In snow, sand, mud, and rock the center diff is locked 50/50 between front and rear.
The only time the transfer case is locked is in 4 low. The torque split is 50-50 in mud, sand, and snow mode but it still is not locked.
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