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Old 03-04-2013, 04:24 PM   #14
NASIOC Supporter
Member#: 156712
Join Date: Aug 2007
Chapter/Region: AKIC
Location: Fairbanks, Alaska
1991 Legacy SS
Pearl White


Lots of good info, but not 100% accurate.

The DCCD (Driver Controlled Center Differential) only alters the torque bias split between the front and rear axles. It has nothing to do with a front LSD or rear LSD. Those are independent items. This is only the center diff, sending power to the front or rear.

For example an 05 STi has a normal bias of 35% driven power going to the front wheels and 65% going to the rear. With a DCCD, you can "LOCK" the ratio to 50-50% if you want. The electronics involved in auto-mode can make on the fly adjustment of this split based on what information it receives from the sensors.

As for LSDs. They are a no brainer when it comes to putting the power down to the pavement. Without a locked front or rear diff, you will be a "one-wheel-wonder" that everyone has seen at the stoplights at icy intersections. Being that it's a Subaru, you don't want to be that guy.
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