Technical Analysis: WRC Cars 2017

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no, all evos work the same, with very little differences.I talk about Evos from 2001 (evo 7) till evo X.

I mean that the ACD and AYC diff work differently from each other.

The ACD simply lock up with a clutch pack whereas the AYC have two different clutch packs with different function (to send torque either to the right wheel or the left one).

no there is not 2 different gears.

At least in the old AYC diff there was two separate gear ratios, separate to the pinion and crown plus worm gears and whatever else all the components are called. The separate gear set was spinning freely until you lock either of up the respective clutch packs forcing more torque to one wheel or the other. I don't know the details of the new planetary gear AYC's but yes, the principle is the same. At least the 7 had the old type AYC... I'm pretty sure the 8 and maybe the 9 too had them. If the Evo isn't spec-ed as S-AWC it doesn't have the planetary model (I'm talking about European models now... US ones were never fitted with them for some reason until the Evo X which has the planetary gear AYC).

all evos,whatever domestic market they have been build,have at center and rear diff clutch packs AND planetary gears with crown and pinion. Except some versions,usdm and rs versions that have plated limited slip diffs from factory at rear.

I have never seen or heard of a planetary gear center diff. Planetary gear sets take up quite a lot of space and the center diff plus transfer case has not changed design on the outside as far as I'm aware.

I'd happily change my mind if I'm proven wrong though.