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  #25  
Old 07-27-2012, 06:53 PM
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Re: Quadra Trac 1 situation/capabilities

Yeah I think I will invest in them also. If you under you jeep you will see there is no where to attach a tow rope without damaging something on your jeep. This is a huge fail on jeeps part for not making this standard!
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  #26  
Old 07-28-2012, 05:36 AM
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Re: Quadra Trac 1 situation/capabilities

It is strange and cheap of Jeep to not put some sort of tow hook on every model, plain or loaded or 4x4 and 4x2. I mean this is a Jeep wether it goes off road or never even sees a gravel road during it life.
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  #27  
Old 07-28-2012, 04:34 PM
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Quote:
Originally Posted by RedBolt View Post
Pardon my ignorance as I am a newbie when it come to beach driving, but an earlier post stated "Personally I use mud/snow and in 4-low while aired down to 20 psi in the tires." Why would you need (or want) to use 4-low in the sand? Thanks!
Low range locks the front and rear driveshafts together so power is evenly sent to both the front and rear axle. This helps to keep all 4 tires actually turning. You can only use low range on slippery surfaces though, if you use it on something like pavement your driveline will bind up which is hard on your axles.
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  #28  
Old 07-29-2012, 05:34 AM
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Re: Quadra Trac 1 situation/capabilities

Since all JGC's that are 4x4 are AWD, wouldn't even 4hi have both alxes turning with a 50/50 power distribution?
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Old 07-29-2012, 08:41 AM
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Yes the power distribution is 50/50 but say you are driving off road and you get your Jeep up on 3 wheels with one wheel up in the air. If you aren't in low range the wheel that's in the air will receive all the power (at first). With modern AWD systems as soon as something like that happens a function of the ABS braking system applies braking force to the wheel/wheels that are spinning more than the others allowing torque to be sent to all 4 wheels. Low range is the only way to truly have 50/50 torque split to both axles. Search on YouTube for videos like AWD test and you can see what I'm talking about. So to sum up an answer to your question tnjeep yes power distribution in 4 wheel drive high range is 50/50 to both axles until an axle/wheel has more/less resistance to spin.
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  #30  
Old 07-29-2012, 02:04 PM
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Re: Quadra Trac 1 situation/capabilities

Where QT1 is open, the QT2 adds a clutch pack to the transfer case, so there is always torque going to both axles regardless of traction. The amount of torque depends on select terrain mode set. The clutches slip to release drive line binding.

There are some inefficiencies there so a locking transfer case, or switching to 4Low may be a little better in some conditions.

QD adds a clutch pack to the rear axle for the same effect rear wheel to rear wheel. The ultimate capability is provided by QD, but you can only get that with a V8.
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Old 07-29-2012, 02:09 PM
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ColdCase how strong are the clutches in the transfer case on QT2? I know it's better than the transfer case you get with QT1 but by how much?

You know what 4WD system I want in my WK2? The one in the JK Rubicon haha. What's it called rock-trac or something like that?
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  #32  
Old 07-29-2012, 10:37 PM
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Re: Quadra Trac 1 situation/capabilities

QT2 is standard on the STR8 and all Hemi V8s. I don't know if that means anything about strength. I'm not sure if the clutch pack in the newer QT2 is the same as the one thats been around for years. The QT2 is locked in 4low without clutches. The QT1 you can't lock at all and is only used in V6s... don't know off hand what is available in the CRD.

Folks are complaining so much about clicks and clack as well as whining now, wonder what they would do about rock-trac . The JK was so noisy it didn't matter.....
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  #33  
Old 07-29-2012, 10:47 PM
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ColdCase I should have used a different word than strong. What I meant is how well do the clutches in the transfer case in QT2 push power to front/rear axle while in high range?
For example if the back tires are spinning and fronts aren't in an offroad situation can the clutches 'push' power to the front axle or does the ABS function of the brakes still need to activate to help?
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  #34  
Old 07-30-2012, 06:17 AM
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Re: Quadra Trac 1 situation/capabilities

I would like to expand the OP's question a bit. He asked about whether his QT1 was up to sand. I have a QT1 that I bought primarilly for road use, but would not be opposed to some off-road use. I know that it is not, and never will be a rock crawler nor do I want it to be. Is there a chart somewhere that shows the types of off-roading experiences, from gravel roads/forest service roads to rock crawling with all the conditions in between and what transfer cases would be appropriate for each?

I suspect the QT1 is more capable that I am thinking it is, but my primary mission for it was AWD, which I understand it does just fine at. My last vehicle was a 4x4 Armada with running boards and all the options. It was very capable, but I never took it rock crawling as that would have ripped off the boards and, given the wheelbase, probably half the underside.

I appreciate the input from those who have tested the QT1 in various conditions. I realize that wheel/tire selection plays a big part and the 20" wheels with low profile tires on the Altitude are not ideal for many off road situations, but having another set of wheels on hand is a possibility. Thanks for the input.
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Old 07-30-2012, 07:45 AM
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Re: Quadra Trac 1 situation/capabilities

Quote:
Originally Posted by RedBolt View Post
Pardon my ignorance as I am a newbie when it come to beach driving, but an earlier post stated "Personally I use mud/snow and in 4-low while aired down to 20 psi in the tires." Why would you need (or want) to use 4-low in the sand? Thanks!
The reason I use 4-low in sand is so that the axles are locked at 50/50. In 4-hi the computer is constantly managing how much torque to distribute power between the axles. In some instances I believe that the T-case was overheating from the constant changes. I use 4-low just to be safe.
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Old 07-30-2012, 08:18 AM
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Re: Quadra Trac 1 situation/capabilities

Quote:
Originally Posted by Schweibs View Post
ColdCase I should have used a different word than strong. What I meant is how well do the clutches in the transfer case in QT2 push power to front/rear axle while in high range?
For example if the back tires are spinning and fronts aren't in an offroad situation can the clutches 'push' power to the front axle or does the ABS function of the brakes still need to activate to help?
Jeep claims 90% so if one axle is completely off the ground you get 90% of the engine power to the axle on the ground. I haven't seen anyone actually measure it. A locked transfer case would provide 100%.

Brake traction is used between wheels on the same axle. If one wheel loses traction, brakes are applied to it to keep its spin rate about the same as the other wheel on that axle. If I recall correctly, brake traction control is about 50% efficient. So if three wheels are off the ground, with QT2 you would get about 45% of the engine power to the one with traction. QT1 about 25%. Add QD to the QT2 case, with both front and one rear off the ground, the rear wheel on the ground gets 80% of engine output, rears off the ground and one front, the front on the ground would get about 45%.

There are other factors that may be more important, such as response time, but QT2 is not free as the extra weight and clutch dragging reduces mpg, some say 1-2 mpg on the highway.
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