![]() ![]() They DO NOT use VDC, just a mild traction control. Manual Subaru cars (except the STI), rear lsd or not, use a viscous locking center limited-slip unit. Subaru uses the planetary diff (part of the auto transmission) with VDC because it has a mild locking factor. Its why big brakes and heavy, overbuilt drivetrains were the norm in older audis. The competing needs of these systems is why Audi have a poor track record for reliability and why their drivetrains are overbuilt. If the center diff had to fight the traction control, it would blow. The open rear diff allows the power to travel along the path of least resistance.Īudis use a center diff with a weak locking factor because they use powerful traction control. Because this center diff is a mild limited slip, however, it will continue to apportion some torque to the rear, most of which will come through to the wheel which isn't being locked down. This balance is determined by the cut of the helical gears. If one of your rear wheels slips, the vdc will try to lock it down and the helical center diff will send more power to the front to balance the torque between axles because it requires a disproportionate amount of torque to drive the rear axle against the resistance of the VDC braking. It's only available on automatic models because they have continuous torque distribution systems (planetary center differentials). VDC is powerful traction control-an electronic system that chooses which wheel to brake. Rear LSD is only available on subaru manuals as far as I know. They are capable of a strong locking factor and last forever. They're a racing homologation used on 600-800 hp wrc cars. ![]() A rear LSD makes a HUGE difference because it produces an effect called turn-in.Ĭontrary to some of the speculation on here, subaru's rear viscous LSD's are not 'weak' and are simply re-tuned for WRC rallys. I joined mostly to comment on this thread because it's a top hit on Google. And then for 2009 the 4 cylinders all dropped the rear LSD when VDC became standard.Ī lot of car forums tend to be rife with speculation. ![]() I remember specifically in 2008, the base Outback had a rear LSD, but the higher trim levels with same transmission did not because of the Vehicle Dynamics Control. The Outback 3.6R with 5EAT uses the VTD AWD system, and my guess is it still has a rear LSD because the VTD systems always had the LSD, and they probably just kept on making them that way.īecause what they were doing when they started rolling out the stability & traction control was that the models which had that standard started to not have the LSD. And I have two friends with Cooper S's, one with LSD, one without, and huge difference there.īut my '01 Forester S has a rear LSD and compared to Forester L's I've driven without it, I really don't see what the big deal is, it's barely noticeable, except for going up a steep hill in the snow, the donkey end might wiggle back and forth a tiny bit less. When I had my SVT Focus I put a Quaife LSD on it, and boy oh boy that made a difference. Yeah an LSD makes a huge difference in some cars, in ours, not so much. ![]()
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