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Old 09-12-2007, 01:54 AM   #1
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ESC and LSD

Since Wranglers come standard with electronic stability control, is it necessary to have Limited slip diff. Doesnt the to devices basicly perform the same function? Prevent tire slip in one capacity or another....Dont flame me im not a mechanic.....I just change my oil myself. Theres a piece of mind when you buy mobile 1 fully syn and fill it yourself...

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Old 09-12-2007, 10:11 AM   #2
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From what I understand ESP deals with stopping and the breaking of the vehicle. Limited slip (years ago positraction Pontiac name) is the rear drive system that sends power to the wheel with the most traction. If one of the rear weels begins to spin the power is sent to the other weel. I am not sure if it locks up so both weels have power.
I am sure some one else can explain it better.

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Old 09-12-2007, 02:39 PM   #3
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In my experience

LSD= suck or stuck (you pick) but I guess it's better than a full open diff, barely. Get a locking differential if you do a lot of off-roading.

LSD - http://auto.howstuffworks.com/differential3.htm

ESC - http://en.wikipedia.org/wiki/Electro...bility_Control

LSD is a mechanical control in the differential that aids in slowing wheel spin whenever one wheel spins faster that the other (mud/ice). ESC is a computer control which reduces engine power and applies breaking (traction control) to prevent wheel spin and regain control.

To answer your question you are probably better off with both than with only ESC, but if you want the most bang for your buck, get a locker.
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Old 09-12-2007, 11:29 PM   #4
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Ok, Hang on here we go........ The JK uses the ESP, ERM and Traction Control all the same way. First lets touch on the ESP system. The Traction control is done with the computer using each wheel speed sensor that measures wheel speed. It then compares them with what the other 4 wheels are doing at the same time, then when the computer senses on wheel (the rear driver for this example) spinning faster than the other (passenger rear) it will do 2 things. The first is it will apply the brakes to ONE wheel that is NOT spinning, therefore transferring the torque to the Wheel with traction (pasneger rear). If the computer notices that there is not enough "effect" happening in a certain amount of time, it will close the throttle to help control wheel spin. Now lets touch on the ERM. The ERM bases its OUTPUT on the Inputs its recieving from various sensors. These sensors include the SAS (Steering angle sensor, it senses the position of the steering wheel), the four wheel speed sensors, located at each wheel, The electronic throttle control, and the ABS pump. Now, lets say you are driving down a smooth dirt road, and there is a sweeping right hand corner coming up. So, you think "what the heck, lets slide this thing" so you hammer the throttle down to the floor, and throw it into the corner. This is where things get interesting. The computer thinks by the readings from the SAS, the wheel speed sensors that you are sliding uncontrolably out of control. So the first thing the computer does is Pull throttle out, then it decides that it need to apply the front left caliper and the rear right caliper brake pressure. What this does it corrects your slide by braking and making the vehicle straighen out by applying certain brakes at certain times, under certain circumsatancs. Once you figure out how much FUN it can be, just hold your foot on the floor and throw it into corners. Let the jeep have the fun with ya!!! I will touch on the other electronics in the JK later...my fingers are tired...


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Old 09-13-2007, 12:42 AM   #5
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^^Hahah...thanks for taking the time to clear that up. Well said also.....Would it be advised to order the trac-lok limited slip diff, if im going to use my JK for an everyday driver. And little to no off roading.....IM sure I asked this question before but im looking for more opinions
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Old 09-13-2007, 03:05 PM   #6
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Quote:
Originally Posted by Superbuick96 View Post
^^Hahah...thanks for taking the time to clear that up. Well said also.....Would it be advised to order the trac-lok limited slip diff, if im going to use my JK for an everyday driver. And little to no off roading.....IM sure I asked this question before but im looking for more opinions
It's impossible to not take a jeep offroad. But, if you do not wish to utilize your jeep in this regard, save your money and x the LSD.
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Old 09-13-2007, 07:55 PM   #7
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I got ta use my rear locker last weekend climin some hills and runnin thru a dry creekbed and it really worked well.....I believe Ida got stuck in the sand without it.......These street tires arnt much help
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Old 09-13-2007, 09:27 PM   #8
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Quote:
Originally Posted by Superbuick96 View Post
^^Hahah...thanks for taking the time to clear that up. Well said also.....Would it be advised to order the trac-lok limited slip diff, if im going to use my JK for an everyday driver. And little to no off roading.....IM sure I asked this question before but im looking for more opinions
I would get the LSD. Its not really that much $$ and even if you never go offroad, it will help resale value in the end.

Joe

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