EDL vs XDL

[cktsi]

Anyone know what the difference is between EDL and XDL? I've tried researching on the net but have found nothing. I'm guessing XDL is a souped up version of EDL (but I can't even find anything on how EDL works to prove it).

[Maverick]

Anyone know what the difference is between EDL and XDL? I've tried researching on the net but have found nothing. I'm guessing XDL is a souped up version of EDL (but I can't even find anything on how EDL works to prove it).

Try the Golf GTI brochure on the Australian VW website.

Electronic Diff erential Lock (EDL)
This permits smooth accelerating on surfaces without uniform grip. If one
wheel starts to spin, EDL brakes that wheel, directing power to the wheel with
greater traction.

Extended Electronic Diff erential
Lock (XDL)
XDL is an extension of the
Electronic Differential Lock (EDL).
This applies pressure to the inner
front wheel during cornering to
prevent spinning. Precise brake
pressure helps to maximise traction,
reduce understeer and improve
responses, thus making cornering
even more sporty, safe and accurate.

Electronic Diff erential Lock (EDL)
EDL improves driving and steering characteristics when accelerating
on road surfaces where each wheel has a different degree of traction.
The system operates automatically and is combined with the ABS
system. Using the ABS wheel sensors, EDL monitors the speed of the
individual driving wheels. When a difference in driving wheel speed
is detected (i.e. when one wheel starts to spin due to differences in
road surfaces, e.g. due to water or dirt) the system brakes the spinning
wheel, transferring engine power to the wheel with the best traction.

Extended Electronic Diff erential Lock (XDL)
The Electronic Differential Lock XDL is an extension to the EDL
function. When cornering, the XDL responds to the unloading of
the front wheel on the inside of the corner. The ESP hydraulics are
used for the XDL to apply pressure to the wheel on the inside of the
corner in order to prevent wheel spin. This improves traction and
reduces the tendency to understeer. As a direct result of the one-sided
and precise braking pressure, cornering is sportier, quicker and more
accurate.

[logger]

Anyone know what the difference is between EDL and XDL? I've tried researching on the net but have found nothing. I'm guessing XDL is a souped up version of EDL (but I can't even find anything on how EDL works to prove it).

I think you might be right. They changed the coding a bit and declare they "fitted" an extended electronic diff lock.

The GTI brochure whilst quite correct is of course a marketing tool and will have a degree of spin to it if you pardon the pun.

The VW SSP Traction Control and Assist Systems (design and function) says this about EDL:

EDL
The electronic differential lock was originally designed as a starting aid. EDL intervention in the vehicle dynamics if one of the drive wheels is spins on accelerating. The spinning wheel is braked. Thanks to the brake’s specific intervention, the drive torque which can be transmitted at the spinning wheel is increased. The differential is able to transmit more torque to the gripping wheel on the drive axle. The vehicle accelerates faster and remains steerable. As the effect corresponds approximately to that of the mechanical differential lock, the system was called the electronic differential lock.
EDL intervention can take place up to a speed of 80km/h (Touareg up to 120 km/h) and also during cornering. On actuation of the brake pedal or at maximum brake disc temperature, which is calculated by the ABS control unit, the EDL is deactivated immediately.

I would like to know how they implement the changes that turn EDL into XDL. Is it simply a matter of changing certain parts of the ABS unit coding via VAGCOM as some of us have pondered?

[cktsi]

thanks mav. Since i have the 118tsi i never thought to look at the mk6 gti marketing brochure.

Both of your explanations then raise the question of whether the anti slip regulator is also brake operated? I originally thought ASR was achieved by torque limiting somewhere in the drive train.

In sydney's recent rain i have triggered asr and noticed its more 'violent' than my old mk5 2fsi manual. Dont know if its down to different gear box type or different implementation? Thoughts?

[TonyJZX]

all this to avoid putting in a real mechanical LSD

the lengths these people go to (not singling out VW, everyone does it)

[cme2c]

all this to avoid putting in a real mechanical LSD

the lengths these people go to (not singling out VW, everyone does it)

Interestingly, the Renaultsport Megane RS250 has electronic diff in the "sport" (softer) model, and mechanical in the "Cup".

[cme2c]

In sydney's recent rain i have triggered asr and noticed its more 'violent' than my old mk5 2fsi manual. Dont know if its down to different gear box type or different implementation? Thoughts?

I have found it seems to depend on the available traction. On low grip surfaces like white lines, it seems quite violent, but on higher grip surfaces it appears gentler, just flashing the dash light.