What Happens When You Do A Burnout In An Open-Diff Car With Torque Vectoring?
Since taking delivery of our Jaguar XE S longtermer, we’ve been intrigued by its drivetrain setup. It does without a limited-slip differential, but you do get torque vectoring by braking. This is supposed to act like an LSD, by applying small amounts of braking to alter the speeds of each of the rear wheels.
So, you shouldn’t get one wheel spinning up madly on its own, otherwise affectionately known as one tyre fire. To test just how effective it is, we thought we’d do the mature thing and perform a ruddy great burnout.
As you can see, it does ‘lock’ the wheels as an LSD would and rather nicely smokes both rear tyres (sorry, Jaguar…), but how well does it do some equally mature skids? Once you push past the initial understeer the XE S will happily shake its rear end about, but in our little test, the 335bhp Jaguar seemed very keen to light up just one wheel. So, the vectoring system can mimic an LSD, but not under every situation.
As to how it would perform when doing proper, full-on powerslides, we’re not yet sure. If we get the chance to try it out, you’ll be the first to know…
Comments
Pretty much a Jaaaaaaaggg at full chat.
Actually I do not see a problem here. Inner wheel will ALWAYS light up a lot more aggressively than the outer wheel. Here is a car with a mechanical clutch pack LSD doing donuts - note that even after I brake stand to light up both tires as soon as I start moving again the inner wheel does most of the smoking. https://www.youtube.com/watch?v=R1Va2gYQ7sg
The fact that the Jag could do actual donuts means it’s diff emulation is doing it’s job just fine, if there was a problem it would insta-plow with it’s front to the outside lighting up the inner wheel while the outer wheel would roll idly.
To me it looks like the proper LSD is doing a much better job of locking up the rears there. The torque vectoring system in the Jag does a good job of mimicking an LSD, but it’s not going to be as good as the real thing
Something else to note: in aggressive driving, you’re putting a lot more stress on the rear brakes by using them as an LSD
Off road enthusiasts have been using small amounts of brake force to force all the wheels to turn with open diffs for years, the concept should be the same in this situation
Yeah. It’s basically the only way to do it without locker’s. I do it in my jeep all the time
Yeah Hummer has an old video telling people to lightly press the brakes to lock the wheels on the h1.
Do the same test on the dry. My E30 has an open diff and without any electric gizmo with torque vectoring and stuff. It l does maaad burnouts on the wet road. Try it but in the dry and please update this post! I would greatly appreciate it! :)
Who’s that guy at the end of the video?
You mean Colin Furze?
But you need to keep apart the torque vectoring by braking from the torque vectoring by hydraulic-clutch-plates apart.
So torque vectoring can be pretty different things, with different results.
Brake pads.. Gone!
Lol was thinking the same thing
real consumer advice there! Well played CT… well played….
One thing to bear in mind is that Torque vectoring monitors your steering input, individual wheel speeds, and direction of travel using an accelerometer.
LSD’s only look at the torque passing through the two rear wheels.
Quite likely the car won’t let you drift (unless JLR have kindly stored parameters to allow it!)
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