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-   -   WK2 QD vs. WK QD? (http://www.jeepgarage.org/f73/wk2-qd-vs-wk-qd-51821.html)

ccfoodog 12-19-2012 02:12 PM

WK2 QD vs. WK QD?
 
My understanding is they dropped the front ELSD from the WK2 QD, but claim to have made "improvements" in the WK2 version.

Anyone have experience with both? How do they compare?

Thanks!

-john

Schweibs 12-20-2012 02:20 AM

QD on the WK has LSD's on the front and rear axles while QD on the WK2 only has a LSD in the back while the front diff is open.

Honestly I don't think you would really lose a lot of off road capability from this. The brake traction control system does a very good job of making sure that both wheels actually turn at somewhat the same speed. My Jeep only has QT1 so I can't even lock my front and rear driveshafts together but I can still go off roading and really get through some difficult stuff.

There are some benefits to having an open front diff instead of a LSD. For example LSD's rob a little bit of engine power while open diffs are more efficient. Plus aren't open diffs usually lighter and more reliable? I would think so.

The QD system on the WK and WK2 performs very well and I bet anyone would be satisfied with either system except for some of the hard core off roaders.

ccfoodog 12-20-2012 04:58 AM

Thanks. I understand the technical differences which suggest the WK has a more capable system. It has been suggested by a Jeep engineer (sorry, hearsay, no reference) that programming improvements in the WK2 system make up the difference. I'm a bit skeptical about that.

I figured there was a fair chance we'd have some folks here that owned both and could give some hands on feedback.

-john

JeeperJohn 12-23-2012 10:40 AM

Re: WK2 QD vs. WK QD?
 
I currently have it on both and I think if you look at the whole system the WK2 is much better. On my WK2 I can dial in the "snow" mode and it makes a world of difference. Same with sand.

I'm not a hard core off roader so I can't tell you about any differences there. But for every day real world driving the WK2 is much better.

ColdCase 12-23-2012 11:38 AM

Re: WK2 QD vs. WK QD?
 
ccfoodog, Are you thinking typical street and mild off-roading?

The WK2 works better on the street and in most off-road conditions simply because it has faster response and does not need wheel spin to engage. If you only have one front wheel with traction, the WK2 would need a bit more throttle to pull you through, however.

You already know the technical details, but the performance difference comes from how the limited slip is implemented and how much control the traction computer has over the diff.

The WK hydraulic limited slip is built into the diffs. The traction controller can only lock the diff, which it typically does in 4low (rear only) or override release which it does when ABS is active (during braking). Because the slip depends on difference in wheel speed to operate, it needs a bit of wheel spin to engage, which can be disconcerting to some.

The WK2 uses an all electric system, no limited slip built into the diff but the traction computer has full control of the amount of slip from 0 to full lock. For example, the traction computer can set a 10% lock anytime it feels the desire (like when set to snow mode). The system will also full lock in 4 Low I think. Folks that use them say the WK2 version is fast with practically no wheel spin until most of the traction is gone. Neither one is suitable for those conditions where you really need a locker.

With the WK2, as you know, you depend on the brake traction in front. There is no way to control the slip or lock the front diff. The old WK system did not allow full time full lock in the front, it just acted like a limited slip diff and locked on differences of wheel speed/traction.

The WK2 traction control processor has more horse power (faster) and more sophisticated programing than the WK.

The WK system may work better in some rock climbing or in deep mud conditions, but I'd suspect you wouldn't want to take any WK rock climbing in the kind of places it makes a difference.

ccfoodog 12-23-2012 01:24 PM

Thanks that's useful info.

-john

Jeff_Jeske 12-23-2012 06:20 PM

Re: WK2 QD vs. WK QD?
 
Well... I just sold my WJ QD and for daily driving kind of stuff it was light years ahead of the WK2. The WK2 simply shuts you down and makes all kind of racket if you stay on the throttle. My WJ would step out and spin and haul arse where the WK2 simply kills power then prevents wheel spin in the front.

I guess if you only needed to climb over rocks and didn't know how to drive on a slippery surface the WK2 might help but in real world conditions I pretty much hate it. It's capable but in now way shape or form is it fun.

ColdCase 12-23-2012 06:36 PM

Re: WK2 QD vs. WK QD?
 
Thats a unique way of thinking about it, everything I've experienced, heard or have viewed on UTube is that the WK2 QD has it all over the WK or WJ QD system for function for those that take driving seriously. If you want drama the older systems are better. The WK or WJ will throw snow, gravel, and mud all over the place as it sits there and does donuts, where the WK2 just goes slow and steady. WJs were a lot of fun to drive if you like to be out of control on slippery surfaces, which many of us find fun/exciting. :)

If you want to get from point A to point B safely, the more modern QD system is better. Some will argue the newer WK2 QTII is better than the old QDs for function.

JeeperJohn 12-24-2012 03:25 PM

Re: WK2 QD vs. WK QD?
 
^ X2 :thumbsup:

ny450es 12-24-2012 03:54 PM

Re: WK2 QD vs. WK QD?
 
if someone gave me the option of 4 wheels pullin instead of 3 i'd go with 4 (all else being equal, ie...same transfer case). i've had a 90 wrangler(5spd manual), 98 ZJ limited and my current 09 Overland. the best one so far is the Overland. dont know if its all the computer stuff helping out but i do know all 4 wheels pullin makes a diff. when i used to get the other two jeeps stuck in the nastiest stuff only 2 wheels(right front and left rear) would spin because of open diffs.

Jeff_Jeske 12-24-2012 05:00 PM

Re: WK2 QD vs. WK QD?
 
^ yea... but the WK QD had a front and rear ELSD.

Schweibs 12-30-2012 03:05 AM

Quote:

Originally Posted by Jeff_Jeske (Post 728281)
The WK2 simply shuts you down and makes all kind of racket if you stay on the throttle. My WJ would step out and spin and haul arse where the WK2 simply kills power then prevents wheel spin in the front.

I guess if you only needed to climb over rocks and didn't know how to drive on a slippery surface the WK2 might help but in real world conditions I pretty much hate it. It's capable but in now way shape or form is it fun.

So assuming you took a WK2 off road did you turn off the traction control? I know that with QT1 on the WK2 it does not perform well of road with traction control set to "on" but if you set it to "off" it performs much better. And yes I do realize that when you then trac control "off" on the WK2 that it is still on it just operates differently.


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