Full-time 4WD that can be exhibited in the road conditions and driving various scenes it is applied to the line up. The transfer of allocating rich power to the front and rear wheels, Torsen was smaller and lighter ® 6 * LSD * 7 is adopted. The differential speed difference is generated in the wheel speed of the front and rear wheels, it is appropriately distributed to the front and rear wheel drive torque from the transmission. The allocation 40:60 torque between the front and rear wheels, achieve high drivability normally. Then, the torque distribution instantaneously between 30:70 from 50:50 in the front and rear wheels according to the running conditions, resulting in steering sensation and dynamic nature. Further, the applied tuning the details including improving the processing accuracy of the counter gear wheel, thereby achieving quietness suitable crown.

Newly developed based on the transmission in the acclaimed 2.5L FR hybrid vehicles. It is possible to achieve low fuel consumption of about 2-fold compared to (4WD) gasoline vehicles of "athlete" series, it has been realized, such as starting and accelerating superior performance, a smooth running and power performance of high-dimensional.

LEXUS :

the IS250/350 AWD and GS350 AWD are using a planetary-gear center differential, plus a wet-type multi-disc clutch control to act as slip control. This is a very advanced and complex design. Because the multi-disc clutch can be 100% locked, it means Lexus’ AWD can handle the case that even front or rear wheels completely lose traction, than the rest side of the two wheels still have full power. The disadvantage of this design is it is complicated and the parts take space. Actually the IS/GS AWD are similar to an off road SUV – they have a separate transfer case to enclose the differential and the limit slip clutch unit.

The LS460AWD and LS600hl are different. They use a Torsen-C limited slip center differential. Torsen C is a mechanical device which has the ability to sense the tendency of slipping, before the slippage actually happened, and then mechanically transfer the torque to the wheel that has traction. We can say the Torsen differential is proactive. This system is all mechanical so it acts instantly. On the other hand, Torsen system has its shortcoming too. It cannot be 100% locked, so there are still slippery situations that it is unable to handle. Therefore in Lexus LS, it also borrows help from the car’s ABS system.

Altough with such advanced and sophisticated design, Lexus seldom advertise their AWD system, or claim this is their selling point (I cannot even find an cutaway illustration of the Lexus AWD system). Perhaps Lexus vehicles are so well build that the Lexus management decided it is not necessary to add an extra selling point?

Before 2010, the Audi Quattro system is using a Torsen center differential. Some may not know, Torsen technology is owned by JTEKT, which is a subsidiary of the Toyota Group. So technically speaking, anything that uses Torsen, is actually developed (or licensed from) by Toyota.

Maybe Audi consider the development cost or licensing cost from Toyota is unnecessary, or Audi consider their own invention may be better. Starting from 2010 Audi RS5, they started to use Crown Gear Differential as the center differential, which is developed within the VW group. The crown gear differential has similar functionalities as Torsen. To be simple, you can treat Torsen and crown gear differential are substitution of each other.