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-   -   Quadra Drive: =All Wheel Drive? (http://www.jeepgarage.org/f73/quadra-drive-all-wheel-drive-16879.html)

THEPRFCT10 12-31-2010 08:10 AM

Quadra Drive: =All Wheel Drive?
 
Ok, I may have just missed something--I really have tried to find this in the manual, but can someone who has better knowledge verify that with the Quadra Drive II system and Select Terrain in Auto mode, the GC is in 2-wheel drive mode unless it detects slip, etc., then goes into 4WD mode as neccessary or you manually select a different full-time 4WD mode like SNOW, etc.? Thanks in advance for the help and answers, I love this forum! HAPPY NEW YEAR guys!:)

nek121328 12-31-2010 08:17 AM

Re: Quadra Drive: =All Wheel Drive?
 
You'll only have three wheels driving as the front axle is open.

Frank TJ 12-31-2010 08:26 AM

Quote:

Originally Posted by nek121328 (Post 325686)
You'll only have three wheels driving as the front axle is open.

Technically you only two wheels driving, one front one rear. Rear Axle acts as an open differential until wheel slippage is detected.

xj31 12-31-2010 09:19 AM

Re: Quadra Drive: =All Wheel Drive?
 
Quote:

Originally Posted by Frank TJ (Post 325688)
Technically you only two wheels driving, one front one rear. Rear Axle acts as an open differential until wheel slippage is detected.

You will actually have all 4 wheels driving unless one or more is slipping.Thats probably not going to happen.I see what you are saying,with an open differential you have the possibility for only one wheel to be driving,but for that to happen,the other wheel has to lose traction

Frank TJ 12-31-2010 10:14 AM

Quote:

Originally Posted by xj31 (Post 325695)
You will actually have all 4 wheels driving unless one or more is slipping.Thats probably not going to happen.I see what you are saying,with an open differential you have the possibility for only one wheel to be driving,but for that to happen,the other wheel has to lose traction

As long as your driving in a straight line. Soon as you turn differential action occurs.

MSCA 12-31-2010 10:53 AM

Re: Quadra Drive: =All Wheel Drive?
 
Quote:

Originally Posted by Frank TJ (Post 325688)
Technically you only two wheels driving, one front one rear. Rear Axle acts as an open differential until wheel slippage is detected.


What? LOL.

Consider a basic RWD sedan (forget anything 4wd for a second) with an open rear differential. Driving down the road under normal conditions, both rear wheels are providing power equally to move the car. It's a misconception that an open differential automatically means only one wheel is providing power to the ground. The problem with open differentials is that power goes to the wheel with the LEAST traction, which means a spinning tire will get all the torque and the tire with traction will basically get no power at all. But when traction is equal to both wheels, then they both split power equally.

dsi jeep 12-31-2010 11:28 AM

Re: Quadra Drive: =All Wheel Drive?
 
The way I am looking is that sometimes traction control on the front could be more problem than help. If all 4 wheels do not have good traction the rear will lock and try to push, but front traction will apply brake to the left, then to the right, back to the left, back to the right .... trying to get traction on one of the wheels but overall will be breaking than pushing. So rear is pushing and front is breaking. Overall the vechicle is not moving or.... moving slow. I live on 10deg hill and when is snowing my front wheel drive Chrysler 300 can not make it to the top because traction control is breaking all the time. If I turn it off I could make it better with a lot of whell spin. But my WJ Overland with QD does not have any problems because varylocks are locking all the wheels and just goes and I have never used winter tires in Wisconsin. I am assuming that in the snow mode the traction control is limited and allows more wheel spin to help pushing. You could see it in the other post with select terrain video when in the snow mode rpm's are 2000 and TC was ON only one time.
Please correct me if I am wrong. I am not trying to say bad things about WK2, just want to explain it miself too.

xj31 12-31-2010 12:01 PM

Re: Quadra Drive: =All Wheel Drive?
 
Quote:

Originally Posted by Frank TJ (Post 325726)
As long as your driving in a straight line. Soon as you turn differential action occurs.

True,but that doesn't mean only one wheel is driving.They will turn at different speeds.
Quote:

Originally Posted by MSCA (Post 325737)
What? LOL.

Consider a basic RWD sedan (forget anything 4wd for a second) with an open rear differential. Driving down the road under normal conditions, both rear wheels are providing power equally to move the car. It's a misconception that an open differential automatically means only one wheel is providing power to the ground. The problem with open differentials is that power goes to the wheel with the LEAST traction, which means a spinning tire will get all the torque and the tire with traction will basically get no power at all. But when traction is equal to both wheels, then they both split power equally.

Very well said.

Frankie 12-31-2010 12:05 PM

Re: Quadra Drive: =All Wheel Drive?
 
Check this out...

http://www.jeep.com/en/4x4/how_syste...uadra_drive_2/

dsi jeep 12-31-2010 12:19 PM

Re: Quadra Drive: =All Wheel Drive?
 
Quote:

Check this out...



This is from the Jeep site but is more for WK because it has LSD in front and rear. WK2 with QD is not explained there yet.

Quadra-Drive IIŽ

Quadra-Drive II's active full-time 4WD system is the ultimate for virtually any driving situation. This system uses the Quadra-Trac IIŽ transfer case and Electronic Limited Slip Differentials in both axles, offering excellent tractive performance. Quadra-Drive II also features a 2.72 LOW-RANGE and NEUTRAL.

Frankie 12-31-2010 12:24 PM

Re: Quadra Drive: =All Wheel Drive?
 
Quote:

Originally Posted by dsi jeep (Post 325795)

This is from the Jeep site but is more for WK because it has LSD in front and rear. WK2 with QD is not explained there yet.

Quadra-Drive IIŽ

Quadra-Drive II's active full-time 4WD system is the ultimate for virtually any driving situation. This system uses the Quadra-Trac IIŽ transfer case and Electronic Limited Slip Differentials in both axles, offering excellent tractive performance. Quadra-Drive II also features a 2.72 LOW-RANGE and NEUTRAL.

Check out the description! ;)

http://img442.imageshack.us/img442/1557/qdii.jpg

MSCA 12-31-2010 12:26 PM

Re: Quadra Drive: =All Wheel Drive?
 
Quote:

Originally Posted by xoxSTUGOTSxox (Post 325797)

That's true, but from what I've heard the QDII system is not the same on the new WK2. It no longer has ELDS in the front axle like the WK and Commander.


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