AWD uses 90% power in the front wheels when road driving and additional engine power is diverted to rear wheels via viscous coupling(only when the front wheels start to slip)
A common trait of mainstream, "grocery-getter" AWD cars, yes, but not at all a proper definition of AWD.
You were correct when you said...
4WD can transfer back and forth to 4WD or RWD. Also you can transfer gearing ranges between high and low
...but AWD performance cars like the GT-R and 911 Turbo are neither 4WD like you describe, nor do they send 90% of power to the front wheels by default.
A car is considered AWD when it powers (or has access to power) all four wheels at all times. Obviously, this means there's no switch for 2WD mode. However, some vehicles tread the line between AWD/4WD (such as the Jeep Grand Cherokee, which runs in "4WD" all the time, yet offers a high/low range), and some AWD vehicles only use the front or rear wheels until slip occurs (similar to your definition of AWD).
The range of differential choices/options with an AWD car are numerous. Many performance cars and modern "torque-vectoring" AWD systems use multiplate clutch packs, for instance. Not just viscous couplings.
I dont care what you drive FR or AWD if your not using a wheel then you cant really claim you have skill its not very hard to drift with a controller. Try full locking a 900 deg steeringwheel then controlling a drift you cant just let go of the stick and your wheels snap back to perfectly straight. What really ****** me off is people posting vids saying check my drift score or linked a whole track and you check out the vid and the front wheels are flicking back and fowards.
To me controller drifting is just as cheating as AWD theres no skill involved.
There's no "snapping" or "flicking" going on at the physics level, trust me. There's still an "input filter," just like every other console racing game.
I noticed the odd steering animation too, which led me to wonder how the physics engine calculates steering input in the first place. But steering with a DS3 in this game is actually
too sluggish. It's a little too easy to run into snap-overcorrection and fishtailing, particularly at high speeds in MR cars, simply because the in-game driver
will not turn the wheel fast enough.
The lack of physical effort involved in drifting with a controller may be a "cheat," but there's no magical instant-lock-to-lock going on. The game would drive VERY differently with a controller if there were. Try Live for Speed with a gamepad and tell me if it feels like GT5.