07-22-2014, 04:40 PM
Join Date: Mar 2011
Location: Prince George, B.C.
Single wheel spin control: Is always on and can not be disabled by the operator. This function transfers power using the ABS by applying brake to the wheel with less traction thus forcing power to the wheel with more traction. This is how you get the LS function on the open diff. New in 2011. I remember my 2011 manual was vague but did detail this and it was copied and posted to some of these threads.I haven't looked in my 2013 manual for this yet.
Originally Posted by joedotmac
Why does Ford offer a option code for the LSD and physical hardware if the alleged one wheel slip feature as it's now coined similates a legitimate LSD? Since all F150's have it will this alleged featured cannibalized orders for the LSD and ELR since they are now deemed less necessary by the one wheel slip feature?
The LSD is being phased out as an option. It is being offered to the few old school types that don't want a locker or believe in electronics doing the job. It will not cannibalize locker sales. It works as a supplement to the locker so you don't have a lousy open rear diff when not locked like FX4's pre-2011.
If alleged is in fact true Ford is seriously deficient in marketing this feature and is missing out on a huge on defining a competitive differentiator.
Maybe, but many competitors are doing the same as nearly all new vehicles have traction control systems now and this LS functionality uses those systems. Sort of becomes standard practice.
Goals are different, in your test there's negligible load difference side to side, and zero traction, the validation used is to hammer the throttle to spin both wheels in dirt or gravel, hey that works great.
?????? You obviously don't get the message that a couple of burn outs are not the only tests that have been performed. How about 3 years and multiple owners posting results? I spent a week trying to figure out how this system worked before I accepted delivery of my truck (first ever Ford so I was extremely cautious) as there was no way I was going to drive around in Northern Canadian winters with a plain open diff. this thing kicked a** all over my LS 2009 GMC HD3500 when it came to function and traction. No clutches clunking in and out, just smooth seamless transition of power to the wheel with more traction. Left my GM for dead on icy roads and I had Blizzacks on the GM and the stock Wrangler AT/S on the Ford. I was sold.
Other driving situations might be to retain traction while going around corner on pavement and not spin the inside tire. Mine spins, and power is pulled from the engine, the one wheel spin control seems to have a limited set of use cases.
Every limited slip rear I've had does the same thing, spins one wheel until the clutches engage the opposite side, in this case with force and then the rear end spins out as both wheels spin. This new system is a little more gradual and smoother, plus using stability control to stop you from accidental donuts.
Will the one wheel slip feature power a 2wd truck through a twist ditch?
Yes, much like a standard LS. Within limits. All systems can be pushed and over whelmed if that is the intent. This is where the locker fits in, pull the switch and no spinning needed, just crawl thru fully locked.
It seems the one wheel slip feature having LSD capability is overly optimistic. Else why does Ford offer a true LSD? Is it possible because the one wheel slip feature has limited use?
The only item remotely close in the '13 manual is on page as reference #4 Engine traction control and two-wheel spin brake traction control functions are disabled. Single wheel spin traction control is always enabled.
Ford labels this as a spin traction control. Using the brake caliper to control wheel spin. Makes zero mention of LSD like features and is a far cry from actually distributing engine torque from the driveshaft to both axles like an LSD would do until the difference in load from side to side is greater than the specification of the clutch pack.
Engine traction control and two wheel spin control are the systems that stop you from overly spinning both rear wheels and going nowhere fast. Engine retards power and/or brakes are applied to stop excessive spinning. One touch of the traction control button disables this function so you can spin your heart out.
However stability control is still on and if you get a little sideways it will shut you down enough to keep you straight. A five second push of the button turns stability control to a higher threshold limit and you can do some donuts or power slides then.