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  #13  
Old 01-11-2016, 03:37 AM
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Re: Does the Grand Cherokee have an electronic locking diff??

Quote:
Originally Posted by f1anatic View Post
Well, what about a mechanical differential - a Torsen ? I do not think on paper such a differential would interfere with the software BLD solution currently in use.
A torsen lsd would be rubbish


As in the rough stuff there's a wheel off the ground quite often and then it'd behave like an open diff

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  #14  
Old 01-11-2016, 03:54 AM
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Re: Does the Grand Cherokee have an electronic locking diff??

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Originally Posted by echo7tango View Post
I have QT2 on mine. I wonder what limitations QT2 has that QD2 can handle? So far with what I've done, and some obstacles were pretty gnarly, QT2 has done well enough. Put another way, what can QD2 do that QT2 can't?
Well I found this on youtube, Jeep QD2 QT2:



Does that sum it up or are there other key differences between QT2 and QD2?
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  #15  
Old 01-11-2016, 10:01 AM
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Quote:
Originally Posted by echo7tango View Post

Well I found this on youtube, Jeep QD2 QT2:



Does that sum it up or are there other key differences between QT2 and QD2?
Yes it does thx for sharing . Also, for us northern suburbanites QDll really assists starts from a stop, like at lights, in the slippery slush, snow and ice by greatly reducing wheel spin at the rear. As always, QTll with great winter tires will smoke a QDll with poor ones.....tires matter!
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  #16  
Old 01-11-2016, 09:32 PM
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Re: Does the Grand Cherokee have an electronic locking diff??

Quote:
Originally Posted by 14SummitHemi View Post
As always, QTll with great winter tires will smoke a QDll with poor ones.....tires matter!
Fair enough, but with all else being equal, QD2 will outperform QT2.

The way I understand it is that with QT2 there is a delay in power transfer to the wheel with grip because the free wheel, the wheel without grip, has to spin freely before QT2 kicks in, applies brake to that free spinning wheel which then lets the diff transfer power to the wheel with grip.

But also , while the free wheel is spinning, the QT2 rig does not appear to slide back downhill like the rig with the open diffs did. So maybe QT2 is also applying brake to the wheel with grip to keep the rig from sliding downhill until power can be transferred to that wheel? I really don't know, this is a guess.

At the end of the video there's a message that says QT2 will get you up the hill also. Yeah, but it's not as elegant as QD2.

I think Wikipedia has a good explanation of the 4WD systems so maybe it's time to revisit that.
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  #17  
Old 01-11-2016, 09:39 PM
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Re: Does the Grand Cherokee have an electronic locking diff??

I'd be interested in some hard info on what the rear elsd is, Jeep were using the eaton units, but the WK2 doesn't appear to be using the same system. There is an eaton e-locker, but it is always referred to as elsd....
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  #18  
Old 01-11-2016, 10:37 PM
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Re: Does the Grand Cherokee have an electronic locking diff??

Quote:
Originally Posted by echo7tango View Post
Fair enough, but with all else being equal, QD2 will outperform QT2.

The way I understand it is that with QT2 there is a delay in power transfer to the wheel with grip because the free wheel, the wheel without grip, has to spin freely before QT2 kicks in, applies brake to that free spinning wheel which then lets the diff transfer power to the wheel with grip.

But also , while the free wheel is spinning, the QT2 rig does not appear to slide back downhill like the rig with the open diffs did. So maybe QT2 is also applying brake to the wheel with grip to keep the rig from sliding downhill until power can be transferred to that wheel? I really don't know, this is a guess.

At the end of the video there's a message that says QT2 will get you up the hill also. Yeah, but it's not as elegant as QD2.

I think Wikipedia has a good explanation of the 4WD systems so maybe it's time to revisit that.
well, both claim to "instantly" detect slippage and do their thing, the big thing is that the non-elsd rear diff relies on BTC to get the torque split and that is inefficient and the brakes can be overridden, etc...better than nothing but....the elsd actually locks the diff on the fly....big difference in certain traction scenarios. The QDll (elsd) is a $795 (I think) option on Limited and Overland ...no brainer.

this is a decent overview...

Jeep Grand Cherokee WK2 - Transfer cases
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  #19  
Old 01-11-2016, 11:01 PM
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Re: Does the Grand Cherokee have an electronic locking diff??

Good overview there, thanks. The one on Wikipedia was not that good.


Quote:
Originally Posted by 14SummitHemi View Post
The QDll (elsd) is a $795 (I think) option on Limited and Overland ...no brainer.
Alas, it's too late for me. Oh well, so be it.
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  #20  
Old 01-11-2016, 11:12 PM
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Re: Does the Grand Cherokee have an electronic locking diff??

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Originally Posted by echo7tango View Post
...Alas, it's too late for me. Oh well, so be it.
It is poorly, as in virtually not all, communicated that you can get QDll/ELSD on a Limited/Overland 4WD/V8...salesmen have no idea...everyone thinks it's Summit only unfortunately.

FWIW, my '02 Limited with BOTH front and rear ELSD (the original Quadra-Drive) would simply walk away from my current rear only ELSD...i relished slippery conditions, it had insane traction and was plain fun in the snow...current gen, meh, gets the job done.
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Old 01-12-2016, 06:34 PM
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Re: Does the Grand Cherokee have an electronic locking diff??

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Originally Posted by MexicanBatman View Post
A torsen lsd would be rubbish


As in the rough stuff there's a wheel off the ground quite often and then it'd behave like an open diff
Yes, correct, by itself it would do that. But lifting a wheel is not the only aspect of off road experience. But the BLD (brake lock differential) control allows the otherwise spinning wheel on the open diff to momentarily slow down or lock and thus transfer torque to the opposite wheel. We would all benefit from a Torsen front and rear diff that worked together with the current BLD solution as the in most circumstances all 4 wheels have some traction.
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  #22  
Old 01-12-2016, 08:22 PM
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Quote:
Originally Posted by 14SummitHemi View Post

It is poorly, as in virtually not all, communicated that you can get QDll/ELSD on a Limited/Overland 4WD/V8...salesmen have no idea...everyone thinks it's Summit only unfortunately.

FWIW, my '02 Limited with BOTH front and rear ELSD (the original Quadra-Drive) would simply walk away from my current rear only ELSD...i relished slippery conditions, it had insane traction and was plain fun in the snow...current gen, meh, gets the job done.
I hear you 14SummitHemi. I have gotten my 14 stuck twice in situations I feel my 08 would have easily driven out of. The braking action on the front differential really makes it feel like things are bogging down when u need it compared to the last gen setup.

I'm sure Jeep has their reasons for not offering a front ELSD currently (warranty/reliability??), but I for one would be willing to pay more for that option.
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  #23  
Old 01-12-2016, 08:32 PM
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Re: Does the Grand Cherokee have an electronic locking diff??

It requires a different driving style using the brake force torque distribution, you need to keep your boot into it when it feels like its bogging down....
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  #24  
Old 01-12-2016, 08:41 PM
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Re: Does the Grand Cherokee have an electronic locking diff??

sticking my head under the SRT

its an E locker made by ZF
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