Hyundai Genesis Coupe and Limited Slip Differentials (LSD) - Hyundai Genesis Forum
Transmission and Drivetrain This section is reserved for talking about transmission and drivetrain discussions.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 27 Old 02-18-2009, 11:25 PM Thread Starter
Poser!
 
Sabbasaun's Avatar
 
Join Date: Jul 2008
Posts: 2,997
Sabbasaun is on a distinguished road
(Thread Starter)
Wink Hyundai Genesis Coupe and Limited Slip Differentials (LSD)

There has been a lot of mis-information on which and what type of Limited Slip Differential (LSD) unit that comes on the Track packages of the Hyundai Genesis Coupe. I'll try to explain as simply as possible which lSD the Genesis Coupe has and why it uses this type of system versus others.

The Hyundai Genesis Coupe has a Torsen (this is the manufacture name) Limited Slip Differential. Torsen typically uses helical gears in their LSDs rather than clutches. They have a very smooth engagement (you usually do not know they are even working) and work great with the Electronic Control systems found on many cars today. They are also very low maintenance for a LSD as there are no wearing parts. It is one of the reasons that many OEMs use this type of system (GM, Ford, Audi, Mitsubishi, etc).

So in the Torsen LSDs, the job of these helical gears is to basically transfer torque or power, either to both drive wheels at the same time or a Ratio (Bias) of power to the drive wheels. Some other generic names that these types of LSD can go by is a "Torque Sensing" or "Torque Biasing". In a nutshell, Torsen LSDs can "detect" when one wheel loses traction over the other and transfers this power automatically (or as I like to say, "AutoMAGICALLY!"). This is important for when you go around corners and one wheel needs to spin faster than the other. You want most of the power going to the outside drive wheel.. When used with the Electronic Traction Control or Electronic Stability Control found on many cars a Torsen unit can aid in getting out of bad driving conditions like in sand, dirt, gravel, snow and even on ice. Another benefit of these units is that you can in a sense "lock" both drive wheels for optimal traction. Great for drag racing in a straight line!

Keep in mind that because of the varying ratios of torque transfer that these units emply they are not called 1 way or 1.5 way or 2-way LSDs. You'll usually find these designations on aftermarket LSD units (Kaaz is one that gets thrown around a lot) that employ a different type of LSD system, usually clutch packs. They are higher maintenance items compared to Torsen units as the clutch packs can wear out and you often have to use a special friction enhanced differential fluid. The Torsen units have no problem running on regular dino gear lube.

So for the Genesis Coupe, Torsen units are great choices for most people. They have smooth low noise operation and they are low maintenance. They will plant power down to the ground and let you light up both tires when you feel like turning off the traction control and showing off to your friends.

Well that's it for now and hopefully this clear up some things on the type of LSD the Genesis Coupe uses. I posted some example pictures below.

Example of Helical Gears that I was talking about:


and a complete view of some different Torsen units with Helical gears:




Sabbasaun is offline  
post #2 of 27 Old 02-19-2009, 12:04 AM
Mini Speeder
 
jiyooniexp's Avatar
 
Join Date: Feb 2009
Location: LA, CA
Posts: 212
jiyooniexp is on a distinguished road
i knew what lsd was, but i forgot it.
thanks for reminding me

...and i'm back
jiyooniexp is offline  
post #3 of 27 Old 02-19-2009, 12:06 AM Thread Starter
Poser!
 
Sabbasaun's Avatar
 
Join Date: Jul 2008
Posts: 2,997
Sabbasaun is on a distinguished road
(Thread Starter)
Quote:
Originally Posted by jiyooniexp View Post
i knew what lsd was, but i forgot it.
thanks for reminding me
lol, no problem
Sabbasaun is offline  
 
post #4 of 27 Old 02-19-2009, 05:28 AM
Moderator
 
Tufast's Avatar
 
Join Date: Sep 2008
Location: Columbus, GA
Posts: 10,780
Tufast is on a distinguished road
Thank You

That's what I was looking from...

Sponsored By: Columbus Body Works / ARK Performance / Modern Automotive Performance / Forged Performance
Tufast is offline  
post #5 of 27 Old 02-19-2009, 06:53 AM
Senior Member
 
orange3.9stang's Avatar
 
Join Date: Feb 2009
Location: N.E. Wisconsin
Posts: 82
orange3.9stang is on a distinguished road
Sabbasaun ...

So the more common and much less expencive Clutch Plate type (like a Ford Traction Lok) is considered a 1.5 way or a 2 way ??

Just trying to embrace this new 1-way, 1.5-way, and 2-way lingo !!

Doug
orange3.9stang is offline  
post #6 of 27 Old 02-19-2009, 07:08 AM
Senior Member
 
Join Date: Feb 2009
Location: Knoxville,TN
Posts: 94
polaris is on a distinguished road
So, probably won't need to go aftermarket if you get the track or r-spec?
polaris is offline  
post #7 of 27 Old 02-19-2009, 10:18 AM Thread Starter
Poser!
 
Sabbasaun's Avatar
 
Join Date: Jul 2008
Posts: 2,997
Sabbasaun is on a distinguished road
(Thread Starter)
Quote:
Originally Posted by orange3.9stang View Post
Sabbasaun ...

So the more common and much less expencive Clutch Plate type (like a Ford Traction Lok) is considered a 1.5 way or a 2 way ??

Just trying to embrace this new 1-way, 1.5-way, and 2-way lingo !!

Doug
The Ford Trac-Lock to me is more of a very weak 1.5 LSD. The way the Ford LSD units mainly works is by "sensing" torque on acceleration. The more power you put down the more load gets placed on the clutches and the tighter they get. Normally the trac-locks have a little bit of pre-load on them. So every day driving and even on deacceleration the unit will stay partially engaged.. However it takes very little to break the friction on the clutch-packs on these units, in my Ford you could break the clutch-pack with as little as ~100 ft/lb of torque when no load was being transmitted to the LSD. That's why I would say they are a weak 1.5. However this is what gives the Track-lock LSDs very predictable driving characteristics.
Sabbasaun is offline  
post #8 of 27 Old 02-19-2009, 10:20 AM Thread Starter
Poser!
 
Sabbasaun's Avatar
 
Join Date: Jul 2008
Posts: 2,997
Sabbasaun is on a distinguished road
(Thread Starter)
Quote:
Originally Posted by polaris View Post
So, probably won't need to go aftermarket if you get the track or r-spec?
It really depends on what your plans are for this car. For the average Joe who does the occaisional track day the OEM LSD will be fine. If you are wanting this car to be an all out drift-car I would invest in an aftermarket 1.5/2 way LSD.
Sabbasaun is offline  
post #9 of 27 Old 05-07-2009, 05:19 AM
Senior Member
 
780gervais's Avatar
 
Join Date: Apr 2009
Location: Edmonton, Alberta, Canada
Posts: 143
780gervais is on a distinguished road
excellent write up!! does anyone know what companies are supplying LSDs for the genesis coupe? i looked at the kaaz website and could only find one for the tiberon?
780gervais is offline  
post #10 of 27 Old 05-07-2009, 05:27 AM
The Dude
 
Lord Calvert's Avatar
 
Join Date: Aug 2008
Location: Puyallup,Wa
Posts: 2,120
Lord Calvert is on a distinguished road
Torsen is the maker of the LSD for the Hyundai Genesis.
Lord Calvert is offline  
Reply

Tags
coupe , differential , genesis bk , genesis coupe , Limited Slip Differential , LSD , Torsen

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome