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-   -   Quadra Trac 1 situation/capabilities (http://www.jeepgarage.org/f73/quadra-trac-1-situation-capabilities-44853.html)

wadejg 07-17-2012 09:23 PM

Quadra Trac 1 situation/capabilities
 
Last June I purchased a 2011 Jeep Grand Cherokee Laredo X package. Unaware of a 4x4 beach where I live I didnít question the 4 wheel drive options available and purchased one with a Quadra Trac 1 system. After being introduced to the beach I decided to take my Jeep on it and successfully visited about 5 times with no problems. The other night I hit a soft spot in the sand and managed to get completely stuck. With help from some good people, shovels and wood I was able to get myself out. The next day I did some research and realized maybe the Quadatrac 1 system isnít sufficient for the sand? Does anyone use this system on the sand and is it a bad idea too? Just purchased some tow hooks but would like some experienced feedback on as to whether or not this is a good idea, Thanks!

JABEACHFANZ 07-18-2012 06:20 AM

Re: Quadra Trac 1 situation/capabilities
 
Quote:

Originally Posted by wadejg (Post 658051)
Last June I purchased a 2011 Jeep Grand Cherokee Laredo X package. Unaware of a 4x4 beach where I live I didnít question the 4 wheel drive options available and purchased one with a Quadra Trac 1 system. After being introduced to the beach I decided to take my Jeep on it and successfully visited about 5 times with no problems. The other night I hit a soft spot in the sand and managed to get completely stuck. With help from some good people, shovels and wood I was able to get myself out. The next day I did some research and realized maybe the Quadatrac 1 system isnít sufficient for the sand? Does anyone use this system on the sand and is it a bad idea too? Just purchased some tow hooks but would like some experienced feedback on as to whether or not this is a good idea, Thanks!

From what I've read on other adventurers taking their wk2 in the sand. Most only use the sand/mud setting with QTII. This is only a programming difference in how torque and wheel slippage is handled.

Personally I use mud/snow and in 4-low while aired down to 20 psi in the tires.

Did you air down your tires prior to venturing out? I have a feeling that airing down should be sufficient for beach driving in most 4WD vehicles.

So theoretically you should be fine with QT1 in the sand as long as you air down. But I would bring a shovel just in case. (Just FYI I've gotten stuck with QTII in 4-Low and in mud/sand mode on the beach becuase I didn't think I needed to air down.

dizz1979 07-18-2012 07:47 AM

Re: Quadra Trac 1 situation/capabilities
 
This is one of the reasons I went with Quadra Drive II. If I get stuck, call 911 lol.

fljeepleo 07-18-2012 08:59 AM

Re: Quadra Trac 1 situation/capabilities
 
I agree,, I would think qt1 should be just fine in the sand. Aired down tires and momentum is the key.

E55 Bulldog 07-18-2012 10:13 AM

Re: Quadra Trac 1 situation/capabilities
 
The only worry I would have with QT1 is that is you are never "locked" into 4WD and basically the system acts like an AWD vs 4WD truck. So basically when you tires start to slip you 4WD kicks in but as soon as you pick up speed and all 4 wheels seem to be moving freely the 4WD disengages and you are back to 2WD. The only problem with this in sand is as soon as you start to bog down or hit some deep dry sand it might already be too late and the 4WD almost digs you deeper. I see this a lot on your beach where people in AWD SUVs get stuck since their 4WD is not locked as a full time 4WD.

ColdCase 07-18-2012 10:15 AM

Re: Quadra Trac 1 situation/capabilities
 
Yeah the biggest disadvantage is the locking part. Takes more driver's skill, and practice will make you better.

JABEACHFANZ 07-18-2012 10:31 AM

Re: Quadra Trac 1 situation/capabilities
 
Quote:

Originally Posted by E55 Bulldog (Post 658248)
The only worry I would have with QT1 is that is you are never "locked" into 4WD and basically the system acts like an AWD vs 4WD truck. So basically when you tires start to slip you 4WD kicks in but as soon as you pick up speed and all 4 wheels seem to be moving freely the 4WD disengages and you are back to 2WD. The only problem with this in sand is as soon as you start to bog down or hit some deep dry sand it might already be too late and the 4WD almost digs you deeper. I see this a lot on your beach where people in AWD SUVs get stuck since their 4WD is not locked as a full time 4WD.

Actually I was reading up on QT1 on jeeps website and found the following:

The brilliance of this 4WD system is its simplicity. Quadra-Trac Iģ 4WD operates in a high-range all-time mode ó delivering optimum traction in virtually any driving situation, with no driver input required. The center differential splits the power ó sending 48% to the front axle, 52% to the rear axle and quietly works with the standard Brake Lock Differential and Four-Wheel Brake Traction Control system to deliver confident all-weather traction.

Watch the video and you should see that QT1 should be fine for sand but airing down is a must if you don't want to get stuck.

AAAA 07-18-2012 12:33 PM

Re: Quadra Trac 1 situation/capabilities
 
Quote:

Originally Posted by JABEACHFANZ (Post 658252)

Watch the video and you should see that QT1 should be fine for sand but airing down is a must if you don't want to get stuck.

This is correct on both accounts. I do not think QT1 is ever in 2WD. Be aware that many 2WD do go out on the beach successfully. Also not all the other vehicles are 4WD, many are AWD with no low range.

ColdCase 07-18-2012 01:17 PM

Re: Quadra Trac 1 situation/capabilities
 
Quote:

Originally Posted by JABEACHFANZ (Post 658252)
Actually I was reading up on QT1 on jeeps website and found the following:

The brilliance of this 4WD system is its simplicity. Quadra-Trac Iģ 4WD operates in a high-range all-time mode — delivering optimum traction in virtually any driving situation, with no driver input required. The center differential splits the power — sending 48% to the front axle, 52% to the rear axle and quietly works with the standard Brake Lock Differential and Four-Wheel Brake Traction Control system to deliver confident all-weather traction.

Watch the video and you should see that QT1 should be fine for sand but airing down is a must if you don't want to get stuck.

I think you missed Bulldog's point and confusing marketing words with the basics of how QTI operates. QTI is an open dif transfer case as well as axles. It splits 48/52 as long as all tires have traction. When a tire starts to spin nearly all power goes to spinning that wheel (its physics). A tire has to start to spin (which interrupts any power being provided to any other wheel) before the traction control computer kicks in to stop the spinning wheel (losing forward momentum during the system reaction time). And the system continues to start and stop wheels. Its better in sand to keep moving smoothly, not bog down, which a locking transfer case is better at. Not a fatal flaw, but if you understand what is happening you may better cope.

As mentioned, there are many 2WD vehicles out on the sand (I used to have much fun with my dune buggy). If you have a bit of skill, you can get them into and out of a lot of places. But a 2WD vehicle is not going to spin a front tire or remove power from a rear wheel and dig the front in/bog down. For sand its best to float (keep the momentum going) and do what you can to prevent tire spin.

Its nice to have the 4WD lock to perhaps keep from getting in over your head :).

penzly 07-20-2012 05:17 PM

Re: Quadra Trac 1 situation/capabilities
 
QT1 always splits 50/50 ish front to back. Regardless of slip. Left side right side will vary based slip and brakes will be applied to compensate.
QT1 is always "locked" 4 wheel, not AWD. AWD has the ability to vary front to back. QT1 does not. So, QT1 is very similar to QT2 in high range. However, QT2 has the ability to direct additional torque front to back, providing 100% to either. QT1 will manage quite well in all but low range. my simple understanding. Am I wrong?

ColdCase 07-20-2012 05:50 PM

Re: Quadra Trac 1 situation/capabilities
 
Quote:

Originally Posted by penzly (Post 659253)
QT1 always splits 50/50 ish front to back. Regardless of slip. Left side right side will vary based slip and brakes will be applied to compensate.
QT1 is always "locked" 4 wheel, not AWD. AWD has the ability to vary front to back. QT1 does not. So, QT1 is very similar to QT2 in high range. However, QT2 has the ability to direct additional torque front to back, providing 100% to either. QT1 will manage quite well in all but low range. my simple understanding. Am I wrong?

There was a thread months ago that went into the specifics but basically you are wrong about the QT1 used in the WK2. The transfer case is never locked, it is alway open. It uses a open differential similar to your axle differential to provide power to both front and rear axles full time without binding up the drive train. The system automatically applies brakes to direct power away from the wheels that are spinning without traction. So by strict definition it is an AWD system supplemented by brake traction control, but marketeers bend those nuances all the time.

QT2 is completely different than QT1, it uses a planetary gears set and clutch packs in the transfer case to direct power to the axle with most traction (similar to an automatic transmission). There is no differential. Brake traction is used from wheel to wheel on the same axle... unless you also have an ELSD in the rear (QD), which uses clutch packs in the rear axle to direct power to the rear wheel with traction. Clutch packs are much more efficient at getting engine power to the ground as there are no brakes generating heat (90% vs 50%). QT2 also has full lock and neutral modes.

QT2 will spin the wheels less than QT1 in the same situation, which is helpful in some situations. If you are hopelessly mired down, doesn't make much of a difference, but there is less chance of getting into that hopeless situation with the QT2 system.

You are right about QT1 managing well in all but the most demanding situations.

tnjeep 07-22-2012 06:30 AM

Re: Quadra Trac 1 situation/capabilities
 
I don't do any beach riding but have some buddies that do and they mostly have picklups that are 4x4 but usually no lockers, just open diffs. They always air down, way down but every not and then you can get stuck, no matter what kind of vehicle you have.


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