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  #13  
Old 08-27-2014, 01:11 PM
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Re: Difference bewteen terrain settings

Thanks Specx that's a lot better than what the manual has to say

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  #14  
Old 08-27-2014, 07:00 PM
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Re: Difference bewteen terrain settings

LOL... I guess some people prefer pictures to words.
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Old 08-27-2014, 07:36 PM
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Re: Difference bewteen terrain settings

I have been looking for more detailed information about what the different settings do as well, but most of the information seems to be vague and fluffy, even the video sounds more like a sales spiel than actual technical information.

I think for those of us coming from mechanical 4WD systems, we would like a bit more of a technical understanding about what the computer is doing, as previously we would be doing this ourselves with throttle control, and selecting gears, etc.

Here's what I mean:

Quote:
Originally Posted by MDBones View Post
• 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.
All this says is it will use 2nd gear and raise the height, that isn't saying much. What are the tuning changes? Does it take torque off at certain revs? How much? Is the TC less or more aggressive in snow than sand mode?
I often used 2nd gear start in sand, is this tuning similar to sand mode tuning, could I use this mode on sand, why or why not?
Quote:
• 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.
I'm guessing this is pretty much like AWD in any soft roader.
Quote:
• 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.
Maximised for traction how? Is this more maximised than snow mode, how? I experience binding in Auto, how is this different? TC throttle control is limited, cool, is this similar in snow mode, or does snow mode not limit TC intervention? Does it tune throttle control to limit torque, how does it compare to snow mode throttle management?
Quote:
• 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.
This looks like a cut and paste from sand mode, is mud and sand mode the same thing? How do they differ?
Quote:
• 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.
How do they achieve improved steer-ability? Is throttle management changed, how? I'm guessing this is the main area they tune rock mode, for low speed control, what do they change to achieve this, other than suggest we use low range?

I'm guessing this is another one of those questions that we would all love to throw at some Jeep engineers some time.... until then it will be trial and error working out how to drive this thing offroad and get use to how the computer manages traction. I'll be giving snow mode a test next time I'm on the beach.
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Old 08-27-2014, 08:07 PM
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Re: Difference bewteen terrain settings

nice video but it tells me exactly the same as the manual i mean what more info do you really require? its electronic not an banger from the 70's
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Old 08-27-2014, 08:09 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by MDBones View Post
LOL... I guess some people prefer pictures to words.
you just cut and pasted the manual ... the video has alittle bit more to say then the regurgitated half headed information that I have been receiving. which might I say both the video and the manual leave a lot to be desired still ,but I am giving up with asking.

Quote:
Originally Posted by Benn0 View Post
I have been looking for more detailed information about what the different settings do as well, but most of the information seems to be vague and fluffy, even the video sounds more like a sales spiel than actual technical information.

I think for those of us coming from mechanical 4WD systems, we would like a bit more of a technical understanding about what the computer is doing, as previously we would be doing this ourselves with throttle control, and selecting gears, etc.

Here's what I mean:


All this says is it will use 2nd gear and raise the height, that isn't saying much. What are the tuning changes? Does it take torque off at certain revs? How much? Is the TC less or more aggressive in snow than sand mode?
I often used 2nd gear start in sand, is this tuning similar to sand mode tuning, could I use this mode on sand, why or why not?
I'm guessing this is pretty much like AWD in any soft roader.
Maximised for traction how? Is this more maximised than snow mode, how? I experience binding in Auto, how is this different? TC throttle control is limited, cool, is this similar in snow mode, or does snow mode not limit TC intervention? Does it tune throttle control to limit torque, how does it compare to snow mode throttle management?
This looks like a cut and paste from sand mode, is mud and sand mode the same thing? How do they differ?

How do they achieve improved steer-ability? Is throttle management changed, how? I'm guessing this is the main area they tune rock mode, for low speed control, what do they change to achieve this, other than suggest we use low range?

I'm guessing this is another one of those questions that we would all love to throw at some Jeep engineers some time.... until then it will be trial and error working out how to drive this thing offroad and get use to how the computer manages traction. I'll be giving snow mode a test next time I'm on the beach.
I sitting in the same boat with you with all the same questions Benn0 ...


Quote:
Originally Posted by nicjak View Post
nice video but it tells me exactly the same as the manual i mean what more info do you really require? its electronic not an banger from the 70's
lol I just wanna know the differences with detailed information...
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Old 08-27-2014, 09:09 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by nicjak View Post
nice video but it tells me exactly the same as the manual i mean what more info do you really require? its electronic not an banger from the 70's
A better understanding of how the system reacts in different modes helps the driver know how to drive it offroad. A good example is driving on sand, in a banger from the 70s you would feather the throttle to maintain momentum, while watching for and avoiding wheel spin which would see you dig down and bog. With the modern terrain control system it seems most drivers have found that you are better off staying hard on the throttle, and letting the system pull back for you if wheel spin starts. That is an example of a driver understanding how the system works, and adjusting their technique to suit. There are lots of various scenarios in sand, mud, snow, rock where a better understanding of how the system is working will help you get through a challenging section, or out of a bog. I'm guessing there may be a scenario where rock mode might help you in sand, it would be good to understand the modes at a lower level to know if and when that is the case....
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Old 08-27-2014, 09:36 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by Evolv0 View Post
you just cut and pasted the manual ... the video has alittle bit more to say then the regurgitated half headed information that I have been receiving. which might I say both the video and the manual leave a lot to be desired still ,but I am giving up with asking
I think you're making this too painful for yourself.
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Old 08-27-2014, 09:47 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by MDBones View Post
I think you're making this too painful for yourself.
Painful is getting stuck offroad because you didn't understand how your car works....
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Old 08-27-2014, 09:56 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by Benn0 View Post
Painful is getting stuck offroad because you didn't understand how your car works....
What I don't like about these automated systems is that the beaches get too crowded. A big part of that is that you don't have to know anything ... At least that's what people are being told.


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Old 08-27-2014, 10:48 PM
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Re: Difference bewteen terrain settings

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Originally Posted by bill_de View Post
What I don't like about these automated systems is that the beaches get too crowded. A big part of that is that you don't have to know anything ... At least that's what people are being told.


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Yep, but if you can find a place that is harder to get to, it will be a bit quieter....
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  #23  
Old 08-28-2014, 08:11 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by Benn0 View Post
Painful is getting stuck offroad because you didn't understand how your car works....

I'd say that has more to do with poor driving skills than not knowing how software algorithms work. And that has a lot to do with why they're used.

I'll take my ability to read terrain and road conditions and what my hands, feet and the seat of my pants tell me anyday over what software algorithms may or may not be doing in the background.

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Old 08-28-2014, 08:22 PM
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Re: Difference bewteen terrain settings

Quote:
Originally Posted by MDBones View Post

I'll take my ability to read terrain and road conditions and what my hands, feet and the seat of my pants tell me anyday over what software algorithms may or may not be doing in the background.

Do you have a choice these days? It seems that no matter what you think is right, the system
will over ride you if it doesn't agree. I haven't been able to find a "do it yourself" mode.


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