I haven’t looked closer to the AYC before because it looks so complicated to understand. I found some pages which clarified (not completely though) how it’s working. The link below is from a Russian page with nice pics with the route of the torque. https://www.drive2.ru/l/3188140/

Google translated: https://translate.google.com/transla...-text=&act=url

The next one shows the difference between AYC and Super AYC (S-AYC). As I understand the AYC “steals” the torque from the other drive shaft and transfers it via the clutch plates and gears back to input. The S-AYC “steals” the torque from the other drive shaft and transfers it directly to the other drive shaft.
http://media.cylex-uk.co.uk/companie...r_AYC_spec.pdf

A couple of pics of the S-AYC where you can see more clearly what is connected to what.
http://mmna.wieck.com/releases/6db11...5-91324b06fc60

“MMC introduced AYC, the first component system of its type in a production car, in August 1996 (EVO IV). Switching from a bevel gear to a planetary gear differential in January 2003 (EVO VIII) doubled the amount of torque AYC was able to transfer.”

What I don’t know if it is possible with a planetary differential to have a torque split of 50/50. Usually planetary differentials have been used with unequal torque split to have a more rear wheel drive feeling.
http://www.stealth316.com/2-awd3.htm
Front / Rear torque split 45 / 55.

Nice pics where can been seen which gears are connected to which clutch pack.
http://www.techtips.ie/Blue-Print/mi...d-system-1.pdf