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 How Do Traction Control and Limited Slip Interact?

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rustbucket



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PostSubject: How Do Traction Control and Limited Slip Interact?   August 22nd 2015, 9:25 am

Not sure if this this is the right place for this post but I'm curious how a limited slip/ locker interacts with a truck that has traction control, particularly one with just RWD. Would the limited slip or locker bring added benefits beyond what traction control offers?
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joemac

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PostSubject: Re: How Do Traction Control and Limited Slip Interact?   August 22nd 2015, 3:15 pm

TC is independent of the rear differential configuration.  Traction control is an electronically controlled feature that uses the wheel speed sensors, observing any delta from the rear wheels spinning faster than the front wheels and or one side versus the opposing.  The control is normally done electronically at the throttle body decreasing power commanded, and pulsating the brakes, thus retaining traction.  

Limited slip is a mechanical function, the limited slip clutch pack attempts to keep both wheels turning at the same rate.  Once the torque side to side is greater than the clutch pack can maintain, the wheels are able to turn at different rates, such as navigating a corner.  

A locker is either engaged keeping both wheels at the same rate, or open, just like an open differential where the wheels are free to spin at different rates and are operating totally independent.

Ford's less than optimal implementation of the locker (electronic) only engages manually via the driver pulling a knob.  This is unlike the GM G80 mechanical locker which automatically engages when 1.5 rotation difference occurs side to side.

TC and a LS or locker both are all attempting to solve similar problems through different means.  The combination of these complementary systems is better than one system alone.
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TheQuig

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PostSubject: Re: How Do Traction Control and Limited Slip Interact?   August 22nd 2015, 6:03 pm

Traction Control in my Chevy can be turned off if necessary. It is recommended not to turn it off unless you are stuck in snow or sand. I have never turned it off in snow. When it is working, it lights up on the dash. I have only seen it go on twice in snow.

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rustbucket



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PostSubject: Re: How Do Traction Control and Limited Slip Interact?   August 23rd 2015, 2:59 pm

joemac wrote:
 This is unlike the GM G80 mechanical locker which automatically engages when 1.5 rotation difference occurs side to side.

TC and a LS or locker both are all attempting to solve similar problems through different means.  The combination of these complementary systems is better than one system alone.

Thanks. A few years back I test drove an F- 150 (reg. cab, 8' box, RWD, open diff) during a nasty early spring snow (wet and greasy) and was amazed how good it was though deep snow might have been a different story. Wasn't sure if ESC/traction control rendered LS or lockers redundant  or if a LS/ locker could cause conflicts in the ESC/traction control system.
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