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Old 09-23-2013, 08:38 PM
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Does Quadra-trac II help in rainy days?

I know under normal driving conditions, it's basically a rear-wheel drive suv. I was wondering if quadra-trac II helps your driving on rainy days especially on high-way when select-terrain is on auto mode?
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Old 09-23-2013, 08:50 PM
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Re: Does Quadra-trac II help in rainy days?

The short answer is NOT REALLY. The QT-II on the highway is really working as QT-I on the highway. If you are in LOW gearing mode available only on QT-2/QD-2 on a off-road and uphill in the rain, then I would say YES.
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Old 09-24-2013, 09:53 AM
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Re: Does Quadra-trac II help in rainy days?

I believe you are incorrect about it being "basically rear-wheel drive" under normal driving conditions. Auto mode is 50/50. Sport mode is 20/80 (front/rear). AFAIK.
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Old 09-24-2013, 11:39 AM
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Re: Does Quadra-trac II help in rainy days?

Quote:
Originally Posted by Jim_in_PA View Post
I believe you are incorrect about it being "basically rear-wheel drive" under normal driving conditions. Auto mode is 50/50. Sport mode is 20/80 (front/rear). AFAIK.
But according to this (Jeep - 4x4 Basics - How Jeep 4x4 Systems Work - Quadra-Trac II - 4WD SUVs), it looks like under normal driving conditions, 100% torque is on rear wheels. I got confused. It would be good if it's 50/50 which I believe should help in rainy days as well.
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Old 09-24-2013, 02:23 PM
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Re: Does Quadra-trac II help in rainy days?

Note the description of Quadra-Trac II in the upper left corder of the graphic at:

Jeep - 4x4 Basics - How Jeep 4x4 Systems Work - Quadra-Trac II - 4WD SUVs

Quadra-Trac II®
This active full-time system functions in all-wheel-drive until additional traction is needed, then reacts by electronically engaging the clutch pack to transfer up to 100% of the torque to either axle.
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Old 09-27-2013, 05:24 AM
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Acording to the manual it is around 50/50, but according to being in a dirt road and flooring it I'm not so sure. You can feel the rear tires losing traction and then feel the torque being transferred to the front, I'm sure there is already some torque in the front but it feels a awful lot like my wife's old explorer, which was RWD but when it sensed slippage it would send power to the front axle.
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Old 09-27-2013, 08:07 AM
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Re: Does Quadra-trac II help in rainy days?

Yes, it will move power around if there is slipping...that's a feature. But under "normal" circumstances outside of Sport Mode, 50/50 is supposed to be the target.
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Old 09-27-2013, 12:59 PM
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Re: Does Quadra-trac II help in rainy days?

Quote:
Originally Posted by loveracing1988 View Post
Acording to the manual it is around 50/50, but according to being in a dirt road and flooring it I'm not so sure. You can feel the rear tires losing traction and then feel the torque being transferred to the front, I'm sure there is already some torque in the front but it feels a awful lot like my wife's old explorer, which was RWD but when it sensed slippage it would send power to the front axle.
Most real AWD cars drive a lot more like RWD cars in slippery conditions than like FWD vehicles. Real AWD cars to me represent those cars with permanent AWD (Subaru; Audi etc) and not FWD until a lethargic system detects slippage (CRV; RAV-4 etc).

Consequently, FWD have a tendency to understeer at all times whereas AWD and RWD cars have a tendency to oversteer when the rear tires lose grip. AWD vehicles exhibit a bit of both - understeer into a corner, oversteer away from the apex.

When I drive my Subaru (front, center, rear LSDs, 50-50% power distribution but no traction control) during freezing rain or snow, I make a point about NOT lifting in corners (on the highway or any other roads driven at higher speeds), as to preserve momentum and suspension load. Lifting (the accelerator) in a corner with an RWD car will send you spinning, as the rear axle becomes "unloaded". With AWD, if lifting or braking, it's usually not a tragedy, but it can create palpitations if the rear tires lose grip.

How To Adjust Your Driving For Rear-Wheel, Front-Wheel, And All-Wheel-Drive Cars
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Old 09-27-2013, 05:18 PM
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Re: Does Quadra-trac II help in rainy days?

Quote:
Originally Posted by Jim_in_PA View Post
I believe you are incorrect about it being "basically rear-wheel drive" under normal driving conditions. Auto mode is 50/50. Sport mode is 20/80 (front/rear). AFAIK.
You are correct. It is not rear wheel drive in any mode, where sport comes closest, but still has some front wheel power.

Easily checked by asking an emissions tech where they have to use the dynos, or looking up towing instructions, or googling.
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Old 09-27-2013, 05:19 PM
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Re: Does Quadra-trac II help in rainy days?

Quote:
Originally Posted by loveracing1988 View Post
Acording to the manual it is around 50/50, but according to being in a dirt road and flooring it I'm not so sure. You can feel the rear tires losing traction and then feel the torque being transferred to the front, I'm sure there is already some torque in the front but it feels a awful lot like my wife's old explorer, which was RWD but when it sensed slippage it would send power to the front axle.
On a wet road, you can chirp all 4 wheels from a standstill with QD-II.
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Old 09-27-2013, 05:30 PM
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On a wet road, you can chirp all 4 wheels from a standstill with QD-II.
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Old 09-27-2013, 08:02 PM
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Re: Does Quadra-trac II help in rainy days?

I never experienced over steer in my Subaru, it was almost always under steer when I slipped beyond its limits. Not severe understeer, just very slight. It is extremely predictable.
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