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  #25  
Old 03-20-2017, 02:59 PM
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Re: Ice. Which setting to use?

Quote:
Originally Posted by 2014RedHemiGC View Post
The engine difference shouldn't make much difference except for perhaps the V8's better low rpm torque. The bigger difference would be the V8's available QuadraDrive sysytem which wasn't previously available with the V6.
I don't think low rpm torque is what you want or need in snow. That's one of the reasons why Snow Mode tells the trans to start in 2nd gear.

As for QDII, it's an option for both engines, no? I know that the TrailHawk has it standard on all engines.

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  #26  
Old 03-20-2017, 03:09 PM
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Re: Ice. Which setting to use?

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Originally Posted by RocketTR View Post
I don't think low rpm torque is what you want or need in snow. That's one of the reasons why Snow Mode tells the trans to start in 2nd gear.

As for QDII, it's an option for both engines, no? I know that the TrailHawk has it standard on all engines.
prior to 2017 ELSD (QDII) was not available on any v6 only the V8 and diesel as an option was probably what he meant.
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Old 03-20-2017, 03:09 PM
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Ice. Which setting to use?

For those with ACC / FCW the round sensor is being hold in place by 3 small plastic clips (part# 68085813AA ). Extremely easy to knock this thing out of alignment. Don't ask why I know this...
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  #28  
Old 03-20-2017, 03:37 PM
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Re: Ice. Which setting to use?

Quote:
Originally Posted by silvermax04 View Post
prior to 2017 ELSD (QDII) was not available on any v6 only the V8 and diesel as an option was probably what he meant.
Exactly! That's why I said "previously" not available.
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Old 03-21-2017, 07:31 AM
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Re: Ice. Which setting to use?

Quote:
Originally Posted by 2014RedHemiGC View Post
Exactly! That's why I said "previously" not available.
That's fine, but my point is that saying the V8 is somehow better in snow doesn't make sense. Why? Well, a V8 and a V6 could both be equipped with QTII, in which case they would be on even playing fields. And as mentioned, QDII is now available on the V6, which means that a V6 Grand Cherokee could have QDII while a V8 Grand Cherokee could have QTII, giving the advantage to the V6 vehicle in that situation.

BTW, I'd love to see the numbers on this, but my guess is that the vast majority of 2014 and newer V8 Grand Cherokees have QTII.

So I know the V6 TrailHawk comes with QDII standard, but can you get QDII on any other trim level with the V6?
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  #30  
Old 03-21-2017, 09:01 AM
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Re: Ice. Which setting to use?

Quote:
Originally Posted by RocketTR View Post

So I know the V6 TrailHawk comes with QDII standard, but can you get QDII on any other trim level with the V6?
Overland has it as an option, I believe.
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  #31  
Old 03-22-2017, 11:46 AM
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Re: Ice. Which setting to use?

There are 2 reasons I could imagine the V8 "might" be better in snow than the V6;
1. the greater weight of the V8 allowing more traction (given otherwise identical vehicles).
2. likely turning less rpm when working, so, if the tires do start to spin they are spinning at a lower initial speed (hypothetically, 3rd gear low rpm in V8 vs 2nd gear higher rpm in V6), therefore affording more initial traction, allowing an easier opportunity to modulate/recover and get back into "hooked up" driving. This "theory of mine" is in keeping with the trans starting out in 2nd gear when in snow mode, again, lower rpm...
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  #32  
Old 03-22-2017, 02:52 PM
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Re: Ice. Which setting to use?

Thanks Mike. You bring up some very good points.
The GC is heavy to begin with, so in snow mode with 50/50 torque split, the extra weight of the Hemi could help front wheel traction. The Hemi does rev less with more torque available on take-off. Snow mode starts in 2nd gear and uses traction control to help the tires hook up and not spin.

While out for dinner a couple of weeks ago, it started to pour rain on the snow-packed laneway. Needless to say, it turned into a slippery sheet of ice. I had trouble shuffling out to the car. Unbelievably, my Hemi in snow mode, had no trouble getting up the sloped laneway by basically just letting it crawl up the hill off-idle.
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Old 03-26-2017, 10:13 PM
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Re: Ice. Which setting to use?

To answer someone's post above, I think rock mode would be only in 4low which by its nature locks the center diff full time. I think any mode with 4low selected would do this.. Someone mentioned that snow mode is 50/50, but I think I've read it can go 80 front if needed. Please correct me if I'm wrong, it's really hard to find clear facts about this drivetrain.

I tested my 2012GC on a steep hill (10% grade?) in about 6inches wet snow on OEM GY tires. From a standstill, as expected, even in 4low, it lost traction and all four wheels spun. At least ALL spun! No vehicle no matter the drivetrain, can overcome this. Thus only option in that type situation is momentum. Going "slow" is usually safe, but sometimes gets you stuck. I laugh at vids of 2 feet of fluff being pushed by a 4x4, because that's easy. Snow type makes all the difference (or ice).

I personally drive in snow mode on anything slick in winter, and shift to 1 at a stop manually to have more fun!
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Old 03-26-2017, 11:54 PM
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Re: Ice. Which setting to use?

From personal testing on a snow turned ice empty parking lot, my QD2 (rear ELSD) behaves as follows:

Snow mode reduces power and allows some oversteer. Spinouts at low speed get arrested before the rear comes around.

Rock mode causes understeer, which can be severe. No spin-out, but you have to back off the throttle a lot to correct the understeer.
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  #35  
Old 03-27-2017, 10:40 AM
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Re: Ice. Which setting to use?

Quote:
Originally Posted by akinney View Post
From personal testing on a snow turned ice empty parking lot, my QD2 (rear ELSD) behaves as follows:

Snow mode reduces power and allows some oversteer. Spinouts at low speed get arrested before the rear comes around.

Rock mode causes understeer, which can be severe. No spin-out, but you have to back off the throttle a lot to correct the understeer.
Thanks for this. I imagine that Sand and Mud would allow for spinouts? I don't live near snow & ice but I too will want to test this out like you did when I get to some snow and ice, if there's a clear parking lot.
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  #36  
Old 03-27-2017, 06:10 PM
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Re: Ice. Which setting to use?

I feel like you guys are really over thinking this stuff. Most of what I've driven has had traditional 4WD which is basically what rock or sand mode is doing in high range. Even in those modes the stability control is going to step in if the back starts to come out.

On ice you're not going to have any magic by changing modes. The only thing that will give you a real advantage is studded or chained tires. Everything here turned to ice on Christmas Eve last December and while it was incredibly slippery (like hard to walk in parking lots slick), my Wrangler was fine in 4 high and mud tires. It's all about knowing how to handle the vehicle and that generally starts with going substantially lower than your average idiot appliance driver who thinks AWD is magic and they can still do 50 on curvy back roads.
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