Okay so I have been on a course on wet and the car diff locks well when turning left, but much much much worse turning right (sorry for the mistake in the title, cannot edit it!) Confirmed by the instructor, who can probably drift a bulldozer. He also noticed the diff is a bit unpredictable and slow, and suggest something might be wrong with it. Oil in diff is about 10 000 km old, and I cannot hear or feel anything wrong besides mentioned problems.
Is it possible that one side of the clutchpack in the diff is gone, or is this a symptom of something else?
Or is this normal due to weight distribution or something?

Thank you

 

That’s not normal. The diff should lock evenly both directions.
Could be a worn clutch pack on one side, or a problem with the internal ramp angles or shims. Also possible the preload is off or there’s a hydraulic issue if it’s an electronic diff.

Try fresh high quality fluid with friction modifier first cheap test. If no change, get a diff specialist to look. Don’t ignore it, because unpredictable lock on wet course is dangerous.

 

It's a mechanical friction-type diif, not electronic. The V6S never got those. The e-diff doesn't use hydraulics, as far as I know. I think there's a stepper motor that loads the clutch.

I have not taken mine apart (noisy bearings) but to the best of my knowledge there is only one clutch pack. There is an @Onca Engineering video showing it:


I agree that an oil change with quality fluid designed for LSD would be a first step.

 

This is a fantastic video, however, I see two clutch packs haha

 

Split friction plates and parts can slide top of each other, depending the direction of rotation.

 

Paging @HermanWiegman @Onca Engineering for his always helpful input here

 

@lizzardo @JagCode3 Good of you to ping Onca Engineering on this topic.
@J444G Your F-Type V6 S should lock up the rear axles equally in both Left and Right directions as well as in reverse or engine breaking situations.
The friction limited slip in your car is symmetrically ramped, and has equally distributed friction disks.
There are two carbon fiber friction disks on the “left” and “right “ sides of the differential carrier.
The ramping on the central carrier should engage the outer friction disks equally.

Unfortunately the carbon fiber friction pads are not well bonded to the disks, so the pads slide and catch on each other causing poor operation.
This failure mode is common and I have rebuilt several of these units.

There are two solutions.
1) refurbish your OEM unit with new moly ceramic friction disks. Onca Engineering developed this solution with RacingDiffs.com
2) upgrade your diff to a Quaife helical geared ATB. Onca Engineering recently transferred this product to Simply Performance in the UK.

I personally run the Quaife unit in my 2017 V6 Manual with great results. And it is maintenance free.

 

One correction to the video.
The axle bearing part number is not fully described.

it is important to get the correct radius on the bearing seat. The “RYA1” specifies this.
Otherwise the plain “J” bearing comes with a sharper radius and will not fit correctly.

correct part: KOYO 32010 JRYA1

 

So I pointed you to the source to prove me wrong.

You're welcome.