Technical Analysis: WRC Cars 2017

[dimviii]

then maybe the centre diff on the Fiesta is not of the usual epicyclic gear type with clutch pack to vary the degree of locking, but maybe it uses two clutch packs each controlling the flow of torque to the front and rear axles. This would permit infinite degree of variability in the proportion of torque send to the front and rear axles. I am not sure how reliable such device on a current WRC car will be, but to the best of my knowledge it is used on the current Focus RS to distribute the torque between the two rear wheels in place of the usual epicyclic type rear differential.

I don't think that is any chance to have just 2 clutch packs and not epicyclic gear type center diff.Imho such application will not be reliable and capable at wrc level,its almost not reliable at street cars(focus rs)