AWD, vs. AWD Lock! - Kia Forum

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post #1 of 25 (permalink) Old 11-20-2016, 02:58 PM Thread Starter
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AWD, vs. AWD Lock!

I recently had an issue with the rear end skidding sideways in light snow a bit at low speed on this new 2015' AWD Sorento, that I also had happen on my previous 2011'AWD Sportage? Going about 10-15mph into a turn, with AWD LOCK ON, the rear end on my Sportage slid out, and hit the curb!? It was kinda hard, but it being snow packed, did no damage, TG. I also had this happen with the new Sorrento when coming up to a Stop sign in a local community, while driving slowly the rear end started to skid out, but I caught it in time to straighten out before the stop. This was in only about 1" of snow!

I haven't noticed anything like this with the AWD LOCK OFF! I know the stock tires are not that good in the snow, & ice, but I was driving slow, & easy! Pondering about these 2 incidents, I'm inclined to believe it is better to Not use AWD LOCK, unless it is absolutely necessary! The Auto AWD appears to work better most of the time. This is Just a Head's Up, for anyone having to deal with nasty weather, be careful out there!


Some previous Hyundai/Kia vehicles: 2002 Santa Fe LX V6 AWD, 2005 Tucson LX V6 AWD, 2010 Tucson GLS 2.4L AWD, 2011 Sportage EX 2.4L AWD, 2015 Sorento Ex V6 AWD
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post #2 of 25 (permalink) Old 11-20-2016, 03:18 PM
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Originally Posted by MikDee View Post
I recently had an issue with the rear end skidding sideways in light snow a bit at low speed on this new 2015' AWD Sorento, that I also had happen on my previous 2011'AWD Sportage? Going about 10-15mph into a turn, with AWD LOCK ON, the rear end on my Sportage slid out, and hit the curb!? It was kinda hard, but it being snow packed, did no damage, TG. I also had this happen with the new Sorrento when coming up to a Stop sign in a local community, while driving slowly the rear end started to skid out, but I caught it in time to straighten out before the stop. This was in only about 1" of snow!

I haven't noticed anything like this with the AWD LOCK OFF! I know the stock tires are not that good in the snow, & ice, but I was driving slow, & easy! Pondering about these 2 incidents, I'm inclined to believe it is better to Not use AWD LOCK, unless it is absolutely necessary! The Auto AWD appears to work better most of the time. This is Just a Head's Up, for anyone having to deal with nasty weather, be careful out there!
hmmmm....interesting. I'll be on the watch for this if the snow ever gets here (just a light dusting this morning).
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post #3 of 25 (permalink) Old 11-20-2016, 04:17 PM
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When you say "stock tires" I hope you mean winters.
Three season tires or summer tires are not going to work at all in snow no matter how slow and easy you go. The first inch is oftentimes the worst driving conditions.

I have never had anything like this occur and put about 50,000 km of winter driving on my 2015 Sorento and used the lock feature many times but with 4 winter rated tires on at all tires in the snow.
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post #4 of 25 (permalink) Old 11-21-2016, 01:07 AM Thread Starter
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Originally Posted by BCRose View Post
When you say "stock tires" I hope you mean winters.
Three season tires or summer tires are not going to work at all in snow no matter how slow and easy you go. The first inch is oftentimes the worst driving conditions.

I have never had anything like this occur and put about 50,000 km of winter driving on my 2015 Sorento and used the lock feature many times but with 4 winter rated tires on at all tires in the snow.
Well good for you! I'm talking about those of us who can't afford new snow rated tires, and have to deal with the O.E. ones, for now. This is about the tendency of how the vehicle reacts when using AWD lock,,, And you're talking tires.

IMO, When you have the AWD Lock off, (automatic. mode) there's a bit of a drag on the rear wheels that help keep the vehicle inline, as opposed to both sets of wheels pulling. Bottom line is, I was wondering why on occasion this was happening, then finally realized it was only when I put each of these vehicles in AWD Lock mode. So, I just thought I'd throw this out there! I have no idea what the results would be with good snow tires, or if they were on ice? Do you think the back end might kick out then? Unless you're using studs.

My Sori wouldn't go up my slightly sloped blacktop driveway in only 4" of fresh fallen snow last night at midnight. In AWD (auto. mode) All the tires were slipping, but in seconds I felt the rears kick in, and it wiggled a bit, then pulled up to the door! I bet if I had locked it in previous to that, I would have ended up sideways in the driveway.

Some previous Hyundai/Kia vehicles: 2002 Santa Fe LX V6 AWD, 2005 Tucson LX V6 AWD, 2010 Tucson GLS 2.4L AWD, 2011 Sportage EX 2.4L AWD, 2015 Sorento Ex V6 AWD

Last edited by MikDee; 11-21-2016 at 01:11 AM. Reason: grammar
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post #5 of 25 (permalink) Old 11-21-2016, 02:30 AM
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Originally Posted by MikDee View Post
... Going about 10-15mph into a turn, with AWD LOCK ON, the rear end on my Sportage slid out, .. also had this happen with the new Sorrento ....
WEll...in a turn, rear wheels track inside of the front wheel track circle and then would have to rotate a bit slower, which is not possible in lock mode, and then they would slip (weight on the rear is less than front) and the tighter the curve, the higher the consequent slip.
IN straight line though, there is no geometrical explanation. ANyway, interesting ; but since we are obliged by law to have winter tires here in QUebec (with consequent hike in price), I might have a reduced chance to duplicate the behaviour.
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post #6 of 25 (permalink) Old 11-21-2016, 12:04 PM
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I don't think the lock has anything to do with it. The dynamax system is not a "lock" like a 4x4 truck with a locking transfer case. It is still a differential in the center that allows the two axles to spin at different rates.

I think it's just a case of the sideways forces on the tire (from the turn) exceeding the grip of the tire on the pavement/snow. Whether that tire is being driven or simply rolling doesn't seem to make a difference to me when you are talking about the tire losing grip and sliding sideways.
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post #7 of 25 (permalink) Old 11-21-2016, 02:29 PM
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... The dynamax system is not a "lock" like a 4x4 truck with a locking transfer case. It is still a differential in the center that allows the two axles to spin at different rates...
Negative. No differential as such (to save weight). Just a magnetic coupling multidisk clutch that , indeed, can slip somewhat under the stress of different rates front and rear, but not to be abused (like having different tire sizes or turning in circles ) as it is not that sturdy and will fry the clutches.

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Last edited by LMP; 11-21-2016 at 03:24 PM.
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post #8 of 25 (permalink) Old 11-21-2016, 06:04 PM
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Originally Posted by MikDee View Post
Well good for you! I'm talking about those of us who can't afford new snow rated tires, and have to deal with the O.E. ones, for now. This is about the tendency of how the vehicle reacts when using AWD lock,,, And you're talking tires.
My apologies I did not mean to offend you. I was pointing out that smooth tires on snow might be the issue and not the AWD Lock.

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post #9 of 25 (permalink) Old 11-21-2016, 06:41 PM
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in the sorento, isnt it the awd lock for locking all 4 but this disengages at higher speed? turning in awd lock mimics 4wd to have traction to get you out on a "'stuck" situation or pulling something on a mud/gravel situation..

you have a dynamax system.. detects yaw.. its a simplistic and improvised awd drivetrain compared to the evolution x (i have one) ; also to save weight.. (awd in demand) you would have been fine if you let the system detect slip.. then it sends power to the outer rear wheel to counter the slide.. if you let go of the gas and brake when slipping, then its same as any car sliding.. have to feed some little gas to activate the "the awd on demand" slipping..

from kia:

Yoo Jae-Myeong
Sr. Research Engineer
Vehicle Testing Team 3
The Sportage is outfitted with a newly developed electronic all-wheel drive (AWD) system.


"The newly applied AWD system offers greater responsiveness compared to the previous electronic magnetic coil method and employs an electronic hydraulic motor method that can reduce vibrations and noise to deliver a smoother driving experience. The use of a hydraulic motor allows direct operation of the system to maximize power transmission responsiveness.
The AWD system evaluates road and driving conditions by receiving data signals from various sensors and exerts exacting control over the clutch’s clamping force, allowing for variable control over the driving power that is relayed to the rear wheels.
According to this principle, the new AWD system can offer optimized driving power control depending on driving conditions. During off-road driving, the rear wheel driving power is maximized. It is then minimized for areas with lots of noise and vibration. During driving at high and constant speeds, settings are differentiated to maintain optimum fuel efficiency.
For example, during constant speed driving, the driving power is almost completely transferred to the front wheels. When cornering, driving power is relayed to the rear wheels in accordance to the turning radius and vehicle speed. If one or two of the front wheels slide, an appropriate amount of driving power is then relayed to the back wheels depending on the level of sliding.
In particular, during the ‘Lock’ mode, power is delivered to all four wheels to help the vehicle through adverse driving conditions."


mitsubishi used to be designing and building engines for hyundai.. then in early 2000s it was the other way around.. except for the 4b11t and 4g63
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post #10 of 25 (permalink) Old 11-22-2016, 07:10 AM
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Originally Posted by kobi411 View Post
...
The Sportage is outfitted with a newly developed electronic all-wheel drive (AWD) system.
"The newly applied AWD system... employs an electronic hydraulic motor ....
OK..interesting info....and from other sources, it seems this system (Dynamax) dates from 2010 on (made in Korea) ... but Magna INternational (Canada) now builds it since 2015 and says it then equips 3rd generation (2016 on) Sorento. DOes tnat mean SOrento 2015 does not have it, or did have it, then made in Korea ?. I will surely explore the underside of my newly acquired 2015 Sorento.

Bought in Oct 2016 at 55000km, now (Apr 2019) at 73000 km. I like cars...

Last edited by LMP; 11-22-2016 at 07:54 AM. Reason: New info , details.
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