What is the AWD difference between the AT and MT Imprezas?
Lets talk about MT cars first. If you think about the way a viscous limited slip works, it’s obvious that “50/50” is a huge oversimplification. Put the car up on a lift and run the engine (not recommended). Now put a brake on the rear driveshaft (i.e., both rear wheels), and measure the torque there. Initially, there will be very little torque as the rear end slows down due to the braking force. 50% of the engine’s torque is obviously not going there right now. Only after the rear shaft has slowed down, and the fluid heated up causing viscous drag, does torque begin to be delivered there. In other words, some amount of slip must occur before the torque “transfer” occurs. Now let’s take AT cars with the MPT (multi-plate transfer clutch) system. This is a very sophisticated system similar to the one used on the WRC (but built for MUCH lighter duty use of course). TCU, or Transmission Control Unit, does indeed “anticipate” slip by applying clutch lock-up depending on throttle, speed, and
