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  #1  
Old 08-25-2014, 08:46 PM
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Difference bewteen terrain settings

Does anyone actually know the exact difference between the "mud/snow/Sand/rock"ect.. settings for the QD2 ...

like for SNOW, does it give more power to the front wheels and starts you out in second grear?
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Old 08-25-2014, 09:20 PM
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Re: Difference bewteen terrain settings

It's explained pretty well in the owner's manual. That's where I'd start.
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Old 08-26-2014, 07:03 AM
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Re: Difference bewteen terrain settings

Thanks, as it was enlightening, it did not tell me what I was looking for, neither did jeepwiki.
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Old 08-26-2014, 07:58 AM
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Re: Difference bewteen terrain settings

Was pretty clear to me
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Old 08-26-2014, 08:27 AM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by nicjak View Post
Was pretty clear to me

How is this telling me what the differentials, transfercase and transmission are doing exactly?

"Sand – Off road calibration for use on low traction
surfaces such as sand or wet grass. Driveline is maximized
for traction. Some binding may be felt on less
forgiving surfaces. The electronic brake controls are set
to limit traction control management of throttle and
wheel spin. If equipped with air suspension, the level
will change to Off-Road 1.


Mud – Off road calibration for use on low traction
surfaces such as mud. Driveline is maximized for
traction. Some binding may be felt on less forgiving
surfaces. The electronic brake controls are set to limit
traction control management of throttle and wheel
spin. If equipped with air suspension, the level will
change to Off-Road 1."

First of all besides the fact that they say the same thing for these 2 settings, all I'm gather is that it is trying to "maximize" traction and clearance.. it fails to give me anything specific, mechanical, gearing, ratios, power front to rear, side to side, locking which differentials or not.. lol I'm looking for more useful information.


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Old 08-26-2014, 05:04 PM
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Re: Difference bewteen terrain settings

It tells me the centre diff is now locked for offroad use in h range. It also tells me the electronics are also activated to limit the amount of wheelspin on a stuck wheel. It couldnt be any clearer.
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Old 08-26-2014, 05:27 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by nicjak View Post
It tells me the centre diff is now locked for offroad use in h range. It also tells me the electronics are also activated to limit the amount of wheelspin on a stuck wheel. It couldnt be any clearer.
since you say you understand, can you please tell me the detailed differences between each of the settings.
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Old 08-26-2014, 06:02 PM
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Re: Difference bewteen terrain settings

I could never find the specifics that are being asked for here. The best I could come up with is that switching to the different modes set a different set of parameters in the software. That causes the drivetrain to react differently to varying amounts of slippage, and send different percentages of power to different wheels as it applies some braking to others.

If I understand it correctly it would take some kind of graph to be able to see what is happening based on the various inputs.

It's a little more involved than switching gears. Unless I totally misunderstood everything I read. The older I get the more often that happens, so feel free to ignore this post.


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Old 08-26-2014, 06:33 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by Evolv0 View Post
Thanks, as it was enlightening, it did not tell me what I was looking for, neither did jeepwiki.

Actually it does. I also think Bill did a pretty good job of explaining in layman's terms how the software parameters play a part in the Select-Terrain operation.

There are two separate operations explained in the OM and you need to consider how they both work together...

- QDII operation.
- Select-Terrain operation.

Quadra-DriveŽ II System – If Equipped

The optional Quadra-DriveŽ II System features two torque transfer couplings. The couplings include an Electronic Limited-Slip Differential (ELSD) rear axle and the Quadra-Trac IIŽ transfer case.

The optional ELSD axle is fully automatic and requires no driver input to operate. Under normal driving conditions, the unit functions as a standard axle, balancing torque evenly between left and right wheels. With a traction difference between left and right wheels, the coupling will sense a speed difference. As one wheel begins to spin faster than the other, torque will automatically transfer from the wheel that has less traction, to the wheel that has traction.

While the transfer case and axle coupling differ in design, their operation is similar. Follow the Quadra-Trac IIŽ transfer case shifting information, preceding this section, for shifting this system.

So on the WK2 QDII you have torque transfer front to rear but you only have side to side torque transfer on the rear axle. This is different from the older QD system that used gerotor couplers in the transfer case and in both Vari-Lok axles. On that system, 100% torque could be applied to any of the 4 wheels.

The WK2 system is relying on traction and stability control software to make up for the lack of a limited slip differential up front.


SELEC-TERRAIN™ — IF EQUIPPED

Selec-Terrain™ combines the capabilities of the vehicle control systems, along with driver input, to provide the best performance for all terrains. Selec-Terrain™ consists of the following positions:

• Snow – Tuning set for additional stability in inclement weather. Use on and off road on loose traction surfaces such as snow. When in Snow mode (depending on certain operating conditions), the transmission may use second gear (rather than first gear) during launches, to minimize wheel slippage. If equipped with air suspension, the level will change to Normal Ride Height (NRH) if the transfer case is in high range. The level will change to Off-Road 1 if the transfer case is in Low range.

• Auto – Fully automatic full time four-wheel drive operation can be used on and off road. Balances traction with seamless steering feel to provide improved handling and acceleration over two-wheel drive vehicles. If equipped with air suspension, the level will change to NRH.

• Sand – Off road calibration for use on low traction surfaces such as sand or wet grass. Driveline is maximized for traction. Some binding may be felt on less forgiving surfaces. The electronic brake controls are set to limit traction control management of throttle and wheel spin. If equipped with air suspension, the level will change to Off-Road 1.

• Mud – Off road calibration for use on low traction surfaces such as mud. Driveline is maximized for traction. Some binding may be felt on less forgiving surfaces. The electronic brake controls are set to limit traction control management of throttle and wheel spin. If equipped with air suspension, the level will change to Off-Road 1.

• Rock – Off-road calibration only available in 4WD Low range. The vehicle is raised (if equipped with Air Suspension) for improved ground clearance. Traction based tuning with improved steer-ability for use on high traction off-road surfaces. Activate the Hill Descent Control for steep downhill control. Use for low speed obstacles such as large rocks, deep ruts, etc. If equipped with air suspension, the vehicle level will change to Off-Road 2. If the Selec-Terrain™ switch is in ROCK mode, and the transfer case is switched from 4WD Low to 4WD High, the Selec-Terrain™ system will return to AUTO.
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Old 08-26-2014, 06:45 PM
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Re: Difference bewteen terrain settings

the explanation above couldnt be any clearer straight from the manual. if you understand 4x4 you should understand the manual. if you arent mechanically minded it will be a nightmare to get your head around it..
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Old 08-27-2014, 09:05 AM
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Re: Difference bewteen terrain settings

Thank you, but I don't think you guys are exactly getting what I'm asking. except I think bill is right, with how the information might not be available.

I'm asking how the drivetrain/software reacts or is treated under each different setting in comparison to one another. aka How does the "Mud" setting differ from the "Sand" setting.

I already know how our drivetrain works and how the software keeps traction.
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Old 08-27-2014, 11:19 AM
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Re: Difference bewteen terrain settings

Check out this video, it helps explain some of the questions your asking about the different modes with using the terrain modes.

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