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  #25  
Old 10-05-2013, 05:35 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by Scottina06 View Post
now for select terrain

auto-The system leaves the traction control system in nominal mode, 45% of the engine power is delivered to the front wheels and 55% is sent to the rear wheels and the Transmission behaves normally

snow-then the system puts a bit more power in the front wheels, starts the vehicle in 2nd gear and makes the traction control system more aggressive.

sport-80% of the power is delivered to the rear wheels (this is where you want power for racing...improves acceleration and handling). The traction control system is also turned off so that the driver is able to drift through corners. The shift points on the transmission are also tuned to be a bit stiffer. Finally, if the Grand Cherokee is also equipped with Quadra-lift then the Jeep will be lowered by about half an inch to improve aerodynamics

((When I put mine into sport mode it does not turn off the TCS, I have to do that manually? 2014 Overland

sand-same as snow except GC starts in 1st gear

mud-same as above but allows more driver intervention

rock- the 4 wheel drive system must be placed in low range. This is done by placing the transmission in neutral and pressing the 4wd Low button right next to the Selec Terrain switch. Once the Jeep is in low range, the switch can be turned to Rock and this mode is engaged. As before the traction control system is more aggressive. If the Grand Cherokee is equipped with the Quadra-lift system the Jeep is raised up to 4 inches giving a pretty good ground clearance.
^^ good info except what I noted
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  #26  
Old 10-05-2013, 10:48 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by JeepGuy2014 View Post
So what is WK2's equivalent of GM's 4HI ?
The WK2 does not provide a manually selectable 4HI switch setting like GM and RAM does on some of their trucks (trucks that also have locking axle options).

Only auto modes are provided where, when necessary (e.g. wheel spin), the the traction computer will automatically set the transaxle to lock (i.e. 4HI) for you.

From what I've heard around here, the WK2 automatic system is so effective it makes a manual 4HI override irrelevant. It is a SUV optimized for driver convenience, not a truck.
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  #27  
Old 10-06-2013, 08:31 PM
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Re: Is it possible to lock the center diff?

It's really a shame that there's no way to lock it independently. Notice I didn't say "manually" because that might cause some confusing. I'm not looking to manually lock anything (like the old school hubs were manually locked), I just wish there was a button or lever to lock the center diff when I want it locked. I'm sure the software is great, but I like to know exactly what's going on with the hardware when I'm using the different 4wd modes.

On some Range Rovers, there's a graphic display of the drivetrain and which diffs are opened/locked. That's very cool and I wish Jeep would have done something similar.
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  #28  
Old 10-07-2013, 10:20 AM
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Re: Is it possible to lock the center diff?

They had a number of reports of jeep's getting stuck in sand and the 4wd disabling itself. They re-did the software algorithims to fix the mud/sand setting. In the 2014's they moved the sport mode to the shifter and seperated the sand/mud to now allow different settings for sand and mud. The center diff is only locked in 4-lo. In 4-hi the computer dictates which axle gets how much power.
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  #29  
Old 10-07-2013, 01:41 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by MSCA View Post
It's really a shame that there's no way to lock it independently.
There are perhaps plusses and minuses. When we designed features into products we tended to avoid those the amateur could accidentally select and damage equipment. For you, perhaps a no brainer, but I need two hands to count the number of times the spouse or daughters shifted the WJ or truck transfer case into 4Hi in mid summer and tried negotiating sharp turns of a parking lot. Then complained of the lack of power when they get home For our family, automatic full lock without any way to override is highly desirable and I am grateful for it.

The range rover display is cool when it works... but I think most WK drivers are not tech heads and would be confused and not impressed. I'd rather have less information, or only the info required in nice large clear displays. Range Rover reviewers often mention how cluttered that dash is and how confusing it can be to the average Joe... who invariably miss improtant things in the clutter..

The 4WD sand mode thing in early models was apparently the traction controller getting confused by noise on the CAN bus, probably generated by a faulty sensor.
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  #30  
Old 10-07-2013, 02:28 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by ColdCase View Post
There are perhaps plusses and minuses. When we designed features into products we tended to avoid those the amateur could accidentally select and damage equipment. For you, perhaps a no brainer, but I need two hands to count the number of times the spouse or daughters shifted the WJ or truck transfer case into 4Hi in mid summer and tried negotiating sharp turns of a parking lot. Then complained of the lack of power when they get home For our family, automatic full lock without any way to override is highly desirable and I am grateful for it.

The range rover display is cool when it works... but I think most WK drivers are not tech heads and would be confused and not impressed. I'd rather have less information, or only the info required in nice large clear displays. Range Rover reviewers often mention how cluttered that dash is and how confusing it can be to the average Joe... who invariably miss improtant things in the clutter..

The 4WD sand mode thing in early models was apparently the traction controller getting confused by noise on the CAN bus, probably generated by a faulty sensor.
That's a really good point that they have a wide range of users.

Although they could still easily put it in 4-Lo and mess things up pretty good.

They should put a finger print scanner in to protect some settings
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  #31  
Old 10-07-2013, 07:03 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by mswlogo View Post
That's a really good point that they have a wide range of users.

Although they could still easily put it in 4-Lo and mess things up pretty good.

They should put a finger print scanner in to protect some settings
That is why it has to be in neutral and pretty much stopped to complete the shift, it makes sure you know what your doing.
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  #32  
Old 10-07-2013, 11:44 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by ColdCase View Post
The range rover display is cool when it works... but I think most WK drivers are not tech heads and would be confused and not impressed. I'd rather have less information, or only the info required in nice large clear displays.
I'd rather just get up the hill. How many PSI of hydraulic foot pounds are being applied to which cog, and how many times per second - not really interesting.

As a curiosity, it would be nice if it logged all of that info so someone could use it for a diagnostic, but other than that, if I get to the top of the hill -- it worked.

The vehicle computers are watching the traction happen is super slow motion. Combined with fast responding differentials and break systems, the vehicle knows a lot more about what's going on underneath it than the driver does. The driver may know what the surface looks like, the vehicle knows what it feels like.
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  #33  
Old 10-08-2013, 08:51 AM
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Re: Is it possible to lock the center diff?

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Originally Posted by Scottina06 View Post
QT2 and QD2 still work the same....but are mated to a world class tranny.
World class?
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  #34  
Old 10-09-2013, 06:55 AM
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Re: Is it possible to lock the center diff?

It is if you get the non Mpar build one and get the Merc version like us Hemi and CRD guys!! LOL
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