Thread: ('11-'14) explain imprezas AWD?
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Old 12-27-2012, 10:33 PM   #35
Commander Keen
Scooby Specialist
Member#: 319157
Join Date: May 2012
Chapter/Region: MAIC
2012 Impreza 4DR 5MT


Snow Drift, that's a great diagram. The only thing I could find was the transfer case showing the clutch plates. The Evo's CD is in the transmission.

Follow the power flow from "Transmission". It goes straight into "Center Differential" in the gearbox. From there it goes to "Front Wheels" and "Rear Wheels", but if you keep following the arrows past the first branch, you'll see that "Hydraulic multi-plate" straddles the front and rear axle.

In the Evo, most of the power going to the rear wheels flows through the CD (like in the 5MT Impreza). In the CVT Impreza, all of it flows through the MPT clutch as it doesn't have a CD. When the Evo's clutch disengages, the rears still have full power (in good traction). When the CVT's does the same, the rears have no power at all.

A similar diagram for the CVT would look like:

Transmission -> Front Axle -> MPT Clutch -> Rear Axle

Clutches modulate torque transfer between two shafts. Differentials transfer motion between three shafts. You can see this in your diagram where both "Front Differential" and "Center Differential" have three connections each, and "Hydraulic multi-plate" has only two.
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Last edited by Commander Keen; 12-27-2012 at 10:42 PM.
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