No limited slip - posi traction on Genesis?

[SoCalGen]

My driveway is pretty steep near the road where you pull in, so in lower vehicles like the Genesis it's best to pull in at an angle to avoid bottoming out. The first day I brought the genesis home from the dealer I pulled in my driveway at an angle and the right rear tire actually lifted slightly off the ground and lost traction. The left rear tire did nothing to help me pull in. The car actually slowly moved backwards when I lost traction and grabbed the pavement again for a moment before losing grip again when the tire lifted. The second time I let it roll backwards, reversed a couple feet and gave it a little more gas so I had momentum to roll into the driveway. Now I have it down to a science but I was kind of disappointed the left rear didn't help out when I lost traction on the right.

 

[scottdk]

The 1st generation Genesis (and probably 2nd) has and electronic LSD, so the car uses the rear brakes to simulate a mechanical LSD, which is almost worthless.

 

[SoCalGen]

The 1st generation Genesis (and probably 2nd) has and electronic LSD, so the car uses the rear brakes to simulate a mechanical LSD, which is almost worthless.

You can say that again!

 

[Buford T Justice]

Sure would be nice to have one. Traction in snow wouldn't be so terrible then. Performance would obviously be helped too.

 

[Billfz1]

Forum,
I am not sure about the other models but specs on the R spec list a limited slip differential specifically. I was out in the rain on Saturday and it was sure acting like one too. Some great slow corner stuff.
Bill

 

[scottdk]

Forum,
I am not sure about the other models but specs on the R spec list a limited slip differential specifically. I was out in the rain on Saturday and it was sure acting like one too. Some great slow corner stuff.
Bill

My 2009 was marketed with an LSD too. Notice much of the marketing doesn't state any details? 2 ways to find out. I know if I do the "ESC MOD" and light up the rear end I get the one-wheel-wonder. 2nd way is to jack up the rear of the vehicle and spin one of the rear tires while the vehicle is in neutral. The wheels should spin in the same direction for LSD. If they wheels spin opposite of each other than it's an open diff.

 

[dareckibmw]

The Rspec comes with an LSD, I'm pretty sure ....

https://www.youtube.com/watch?v=PRQK3MmURBw

 

[427435]

I doubt very much that there is any mechanical limited slip in the Genesis.

Mine uses the brakes on the spinning wheel to force more torque to the one with better traction. Seems to work if you don't get crazy on the throttle. If you do, the engine will then be bogged.

By the way, shifting into 2 before moving also helps in the snow.

 

[scottdk]

The Rspec comes with an LSD, I'm pretty sure ....

https://www.youtube.com/watch?v=PRQK3MmURBw

I can do the same with my car, but my point is that if the ESC mod is done or even the fuse removed completely, you will only spin one wheel. If our rear end was mechanical LSD, this would NOT be the case. It is not a locking rear diff.

 

[SoCalGen]

So.... anyone want to test out putting a Ford 9" rear diff in our cars?

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[daviderle]

I can do the same with my car, but my point is that if the ESC mod is done or even the fuse removed completely, you will only spin one wheel. If our rear end was mechanical LSD, this would NOT be the case. It is not a locking rear diff.

Our cars indeed have LSD, the 2010+ as I recall (there was a big discussion about it at the time) is not 'fully' mechanical but electronically controlled LSD and only on the V8s anyways:

http://www.cars.com/hyundai/genesis/2013/standard-equipment
(Look for limited slip deferential)

I need to look up the the original documentation, the only year that had mechanical LSD (without electronic integration/intervention) is the 2009 and only on the V8 as it did not have the fancy electronic parking/breaking. (Yes, it has a foot based parking breaks)...

Now thinking about it, I was wondering why the R-Spec butt likes to get way a lot more than my 2009 4.6 Under hard cornering (more so with the ESC disabled)! I kept thinking because of the increased power and weight ratio, but this thread reminded me otherwise and to reexamine that hypothesis...

At any rate, sorry dear V6 brethren, but you are very much out of luck...

But in summery, this is another one to add to the V8 advantage column

Hope this helps to clear matters a bit...

 

[scottdk]

David - When I get time I'll jack the rear of my car up and make a quick video of the direction of the wheel spin once up in the air. I would think that my 4.6 and your RSpec would have the exact same rear differential.

The photo below is a shot of the rear diff for a 2009. I notice that the parts are all the same for the 5.0 and 4.6, but part number 1 is the drive axle assembly. This part shows only for the 4.6. I searched the 2012 RSpec, but the site I'm using does not show a rear diff for a 5.0 model for some reason. Partshyundai.com

I just searched for a little bit regarding our LSD and a trusted forum member Mikec has mentioned the LSD in a different thread (shown below) a couple of years ago, so I may be wrong by saying that the car doesn't have a true LSD, but then I would not understand why I can't lay 2 strips with the ESC mod????

http://genesisowners.com/hyundai-genesis-forum/showpost.php?p=65089&postcount=9

 

[daviderle]

David - When I get time I'll jack the rear of my car up and make a quick video of the direction of the wheel spin once up in the air. I would think that my 4.6 and your RSpec would have the exact same rear differential.

The photo below is a shot of the rear diff for a 2009. I notice that the parts are all the same for the 5.0 and 4.6, but part number 1 is the drive axle assembly. This part shows only for the 4.6. I searched the 2012 RSpec, but the site I'm using does not show a rear diff for a 5.0 model for some reason. Partshyundai.com

I just searched for a little bit regarding our LSD and a trusted forum member Mikec has mentioned the LSD in a different thread (shown below) a couple of years ago, so I may be wrong by saying that the car doesn't have a true LSD, but then I would not understand why I can't lay 2 strips with the ESC mod????

http://genesisowners.com/hyundai-genesis-forum/showpost.php?p=65089&postcount=9

As far as I can tell they are identical as well:

http://www.partshyundai.com/auto-pa...ine/driveline-and-axles-cat/differential-scat

I remember talking at length about the subject with one of the techs back in 2010, and his take was the 2010 (V8) still has the LSD, but it is electronically controlled, while the 2009 was purely mechanical....

Now back to your issue, not sure if your modified wheel and suspension setup have any impact on the process? As I am sure you have tried everything (including pressing the break with your left foot, rev the engine with your right foot while slowly removing your foot from the breaks?)


All I tell you that with the the Mrs. 2009 4.6, I can still lay 2 strips through first and half way through the second gear (25 feet plus) with the ESC disabled, and around 5 feet before the ESC intervenes, while ESC disengaged (via the button in the normal way), not to mention can do donuts forever (or perhaps until one of the tires blow out)

One thing to note, it is now slightly more difficult to get the strips to lay down in the first place after the Rigit collar installed on both cars and more so on the 4.6, using the same tire sets...

 

[scottdk]

I can always put 2 strips down with the ESC button pressed off. Just can't with the fuse mod (completely disabled) for some reason, which I find very odd.

 

[daviderle]

I can always put 2 strips down with the ESC button pressed off. Just can't with the fuse mod (completely disabled) for some reason, which I find very odd.

Very bizarre indeed, I wish you can get some OBDII raw / log data for both conditions (perhaps using any method highlighted in HUD on R-Spec thread)

 

[Billfz1]

Well, I can't say for sure, but if they went to a Torson limited slip. The one with the worm gear/ wheels the carrier could look the same externally. These diffs have become popular as they improve mileage compared to a clutch pack limited slip diff.
Bill