What equipment is involved in the XDS system?
Found the option to "activate" it in the ABS module of my Golf TDI. I activated it and have no codes. Just wondering.....is it purely software?
How can I tell if its working?
I thought XDS uses special "height" sensors that can tell how much "unloaded" a particular front wheel is - i.e., the fact that it has little dynamic and static pressure onto the road surface (compared to the other wheel), and as such, is unable to provide much forward thrust and may soon consume whatever transmitted power via spinning out (and thus leave the other wheel powerless because of the open diff's equal torque but much lower rotational speed of that wheel).
I activated it, and have no codes (no "No response from sensor" or anything) showing up anywhere. It would be nice if there were a little more info about this system. Like, what is all involved. Is it completely controlled by the ABS module? Etc.
To my knowledge the XDS sys is linked to the ABS and traction control system and takes into account a bunch of different variables to maintain optimal traction. The TDI already comes with EDL or Electronic Differential Lock so what are you trying to accomplish ?
I'm a Wagon Man
I hear GTI owners raving about "XDS" and how it solves understeer.
I don't know what the difference between XDS and EDL is. Does the GTI have EDL? I guess I'm just trying to activate any features that might be available on my car but are currently deactivated.
Yes and no our"XDS" is nothing more than fancy traction control its not a real LSD it uses the brakes to stop wheel spin by modulating the caliper of whatever wheel is spinning, same for the EDL in the base Golf and TDI. Neither of these systems will cure under steer and anyone who says it cures all under steer from our cars doesn't know what they are talking bout. It does however go along way in helping dial it out and make the car more neutral. Again EDL XDS and the like are already activated from the factory due to them being integrated into the TCS or the cars nothing for you to tweak in VCDS.
I'm a Wagon Man
Its not just stopping the inside wheel from spinning, its through the virtue of how an open diff works(power goes to the wheel with least resistance, ie less grip), by braking that spinning wheel the power will be shuffled to the wheel with grip. It doesn't "cut power" like traction control does(assuming if your ESP is off, or as off as our ESP can be). As mechanical LSD essentially does the same thing, with potentially more effective result and does not induce issue with brake wear.
It certainly helps with understeer, but there's no changing the fact that it's FWD, and all the dynamics that come with that.
I will say this tho, the OEM dunlop's on my gti were so slippy that I never really paid much attention to the XDS system working. Now that i've got a good set of really sticky COnti's on, I notice the system working all the time. And it *works*. That thing will rotate a corner like nobody's business now.
2010 DBM MK6 GTI: A bunch of go-fast goodies, and a bunch of stop-fast goodies.
EDL just works on wheel spin, you get one wheel spinning, it brakes that wheel, transfer more power to the opposite wheel with traction. XDS works with the other vehicle dynamic inputs, like steering angle, speed, lateral acceleration...etc to determine how much to brake to get the car to turn better under power....
Originally Posted by VW
Last edited by feels_road; 05-14-2011 at 02:20 AM.
A search in ETKA for "XDS" returns nothing. I have a feeling that this system is purely software. Can anyone prove me wrong?
I don't know what it should feel like, so I still don't know if I've activated XDS on my car by simply clicking the box on the ABS module.
Not suspension necessarily, it probably should take input from steering wheel position and accelerometers. Both of which normal ESP programming should poll when working as thats how the computer knows what the car is doing. As the car does not have electronic damper or ride height adjustment it doesn't necessarily need height sensors, which aside from the ABS sensor will be the only other type of sensors connect to the wheel end.
It is purely software. Its a easy way to get LSD functionality without adding anything mechanical as all the required hardware are already there. The difference between EDL and XDS really will just be the actual programming difference in how it is supposed to function.
Last edited by RacingManiac; 06-08-2011 at 09:49 AM.
Go around a corner under moderate speed in second gear, try to get to a point where the inside tire would usually just start to spin as you accelerate out. You'll feel the front end of the car pull into the corner pretty sharply if XDS is working properly. It's a bit unnatural feeling but you will get used to it.
As for why VCDS shows it needs to be activated, I have no idea. It should be activated from the factory, although I suppose on a TDI it isn't (although that doesn't seem to make much sense to me).
I think the reason simple EDL doesnt and cant work at higher speeds isnt so much "stress on the brake system" (although the likely on/off operation may indeed amount to a lot of cyclic stresses) but more that it's too simplistic to smoothly bias torque at higher speeds, where there's a potential for upsetting the vehicle and causing loss of control. XDS actually uses a predictive process based on various sensor data, to MODULATE brake pressure, thereby smoothly biasing torque. It does not wait for wheel spin to occur.
Found this info (site is a great, vw-sanctioned/authored reference): http://en.volkswagen.com/en/innovati...sperrexds.html
What ever became of this matter? Toaster, did you figure it out? I'd love to have XDS on my Golf TDI.
Worth a thread revival.
Last edited by RogueTDI; 02-07-2013 at 10:18 PM.
After incessant complaints from a to z, I am now calling all of my characters "special."
I've had XDS activated for a while now...although, I have not changed any adaptations settings yet. No codes or anything, so I would think that it's 'working'?
Give me a few days and I'll report back.