Selec Terrain mode power distribution - Page 3 - 2014+ Jeep Cherokee Forums
User Tag List

 19Likes
Reply
 
LinkBack Thread Tools
post #21 of 96 (permalink) Old 02-23-2014, 09:16 PM
Member
 
mlankton's Avatar
 
Join Date: Jan 2014
Location: Red Oak, IA
Posts: 78
Now I'm confused, the designer of the system in the Cherokee calls it AWD
AAM Ecotrac
mlankton is offline  
Sponsored Links
Advertisement
 
post #22 of 96 (permalink) Old 02-23-2014, 11:04 PM
Forum Elder
 
clew's Avatar
 
Join Date: Nov 2013
Location: Dallas
Posts: 4,065
Garage
Quote:
Originally Posted by mlankton View Post
Now I'm confused, the designer of the system in the Cherokee calls it AWD
AAM Ecotrac
It really irrelevant what anyone calls it, with technology the lines are getting blurry in the middle ground between awd and 4wd.

Granite V6 Trailhawk, Leather, Tow, Comfort/Convenience, 9 Speaker, Nav, Lifetime Maxcare
Adds: E46/ZKW-R/CBI HID Retrofit, RRO Super Sliders, JWS 6145 Fogs, Tint, LED Interior/License Plate Lights, Shark Fin Antenna, Black Muffler, Canvasback Cargo Liner, Weathertech Passenger Liners, Weathertech Window Deflectors
clew is offline  
post #23 of 96 (permalink) Old 02-24-2014, 01:56 AM
Enthusiast Member
 
cloose's Avatar
 
Join Date: Nov 2013
Location: Calgary, Alberta, Canada
Posts: 125
Quote:
Originally Posted by Tiefy View Post
I don't think engineers have anything to do with it, I think its sales trying to hype this up as the most advanced system of its type. Personally I would think they only way they came up with 40% front and 60% rear is because the weight balance would be 60% front 40% rear. Just a numbers game and sounds better than 50/50 split.


From everything I have read, torque is normally split 100/0 front to rear. Then there's the ability to transfer torque to the axle with traction. That varies from 100 % front 0% rear to 0% front 100% rear. BUT 100% rear does not mean rear wheel drive. it just means the front tires are already spinning and have 0% traction, so 100% of the torque is going to the rear, that has traction.
I read this as you are contradicting yourself.....you stated previously that you believe it is impossible for ALL the torque to transfer to the rear as the front is always engaged, yet above you state 100% torque going to the rear ??

If in fact more torque to the rear was impossible, then that would mean that the front wheels would ALWAYS be turning regardless of front slip / rear traction.

Watch the following where it is stated that there is a rear AND front disconnect.


2014 Anvil Jeep Cherokee Trailhawk
Comfort & Convenience group, Leather, Cold Weather group, Technology group, Sunroof, Navigation, CD
cloose is offline  
 
post #24 of 96 (permalink) Old 02-24-2014, 06:09 AM
Enthusiast Member
 
Tiefy's Avatar
 
Join Date: Feb 2014
Location: Sk Canada
Posts: 297
Garage
Quote:
Originally Posted by cloose View Post
If in fact more torque to the rear was impossible, then that would mean that the front wheels would ALWAYS be turning regardless of front slip / rear traction.

Watch the following where it is stated that there is a rear AND front disconnect.
The video states that the rear drive shaft disconnects at the ptu and the rear differential.
Ok people.... 50/50 power distribution is what you achive with both front and rear locked together. Understand? Both Front and rear axles getting all power!
Torque transfer has nothing to do with electronics, or the vehicle. It means that the wheels with traction will get torque transferred to them!
What you all seem to think is with all 4 wheels off the ground in this system its possible to put it in gear and only have the rear wheels turn.
It won't happen! It's goes from 100/0 up to 50/50

Torque split has nothing to do with power transfer! As I explained with the jeep wrangler type transfer case where power is equally transferred 50/50 when in a 4x4 mode. They will still transfer 100% of the torque to the axle with traction!
Tiefy is offline  
post #25 of 96 (permalink) Old 02-24-2014, 06:20 AM
Enthusiast Member
 
Tiefy's Avatar
 
Join Date: Feb 2014
Location: Sk Canada
Posts: 297
Garage
That link to aam that mlankton provided really helps explain everything i've been trying to say.
Tiefy is offline  
post #26 of 96 (permalink) Old 02-24-2014, 08:54 AM Thread Starter
Forum Elder
 
Toecutter's Avatar
 
Join Date: Dec 2013
Location: Bend, Oregon
Posts: 1,667
Quote:
Originally Posted by cloose View Post
Starting at about 1:50 in the video above, the Jeep representative states that the front drive can completely disconnect. Would that be an example of when the motor is sending 100% torque to the rear, such as in Mud/Sand mode?
AlbertaCherokee likes this.

2014 Trail Hawk
V6 | Anvil | Black leather | Tow | Comfort | Cold | Tech | Nav | Subwoofer | Soul patch | 20% tint | 245/70R17 Duratrac
Toecutter is offline  
post #27 of 96 (permalink) Old 02-24-2014, 10:07 AM
Enthusiast Member
 
Tiefy's Avatar
 
Join Date: Feb 2014
Location: Sk Canada
Posts: 297
Garage
Quote:
Originally Posted by Toecutter View Post
Starting at about 1:50 in the video above, the Jeep representative states that the front drive can completely disconnect. Would that be an example of when the motor is sending 100% torque to the rear, such as in Mud/Sand mode?
Yes, the ptu disengages the link to the rear drive shaft, as well as the rear clutch pack. Unlike other vehicles that always turn the rear drive shaft and only have one link that disengages. This saves fuel. Power flow goes engine, transmission, ptu imput, past the rear ptu output to the front differential then front axles.
When the rear drive engages, the ptu sends equal power distribution to the front differential and the rear drive shaft. From this point on the multi disk wet clutch pack in the rear differential unit will engage or release the clutch as needed based on terrain control setting, and front wheel slip. Up to 50/50 power distrubution.
Torque distribution has nothing to do with drivetrain modes! It totally depends on how much traction each axle has!
Anyways, I can't say it any more. If anybody can come up with schematics of the ptu that prove otherwise I invite you to.
Array likes this.
Tiefy is offline  
post #28 of 96 (permalink) Old 02-24-2014, 10:30 AM
Forum Elder
 
clew's Avatar
 
Join Date: Nov 2013
Location: Dallas
Posts: 4,065
Garage
The different modes do have different torque distribution. If the ptu sends power to the rear, it takes it away from the front. The settings for the various modes are defaulted to 60/40 40/60 etc, no slip needed.
Please provide your schematics first that show it is always powering the front 100% till slippage...until then, I will go with the jeep engineers on this one.

Granite V6 Trailhawk, Leather, Tow, Comfort/Convenience, 9 Speaker, Nav, Lifetime Maxcare
Adds: E46/ZKW-R/CBI HID Retrofit, RRO Super Sliders, JWS 6145 Fogs, Tint, LED Interior/License Plate Lights, Shark Fin Antenna, Black Muffler, Canvasback Cargo Liner, Weathertech Passenger Liners, Weathertech Window Deflectors

Last edited by clew; 02-24-2014 at 12:02 PM.
clew is offline  
post #29 of 96 (permalink) Old 02-24-2014, 10:45 AM
Enthusiast Member
 
Tiefy's Avatar
 
Join Date: Feb 2014
Location: Sk Canada
Posts: 297
Garage
Tiefy is offline  
post #30 of 96 (permalink) Old 02-24-2014, 10:55 AM
Forum Elder
 
clew's Avatar
 
Join Date: Nov 2013
Location: Dallas
Posts: 4,065
Garage

Granite V6 Trailhawk, Leather, Tow, Comfort/Convenience, 9 Speaker, Nav, Lifetime Maxcare
Adds: E46/ZKW-R/CBI HID Retrofit, RRO Super Sliders, JWS 6145 Fogs, Tint, LED Interior/License Plate Lights, Shark Fin Antenna, Black Muffler, Canvasback Cargo Liner, Weathertech Passenger Liners, Weathertech Window Deflectors
clew is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the 2014+ Jeep Cherokee Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



  Similar Threads
Thread Thread Starter Forum Replies Last Post
Jeep : Grand Cherokee Overland Overland SUV 5.7L Sunroof NAV Power Steering Power Doo Jeep Cherokee Parts Jeep Cherokee eBay Classifieds 0 02-21-2014 08:40 PM
Jeep : Grand Cherokee SRT-8 SRT-8 Certified 6.4L V-8 NAV Power Steering Power Door Lo Jeep Cherokee Parts Jeep Cherokee eBay Classifieds 0 02-12-2014 12:50 PM
Selec-Terrain knob for Limited Wildturkey 2014+ Jeep Cherokee General Discussion 6 01-24-2014 02:45 PM
Selec Terrain Mode testing *video* Tyler-98-W68 Off-Road 8 12-29-2013 09:15 AM
Selec-Terrain Seguerski 2014+ Jeep Cherokee General Discussion 5 12-06-2013 11:56 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On