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HC is the TCD diff, which uses extremely high precision oil grooves and oil
channel holes in the clutch plates as well as oil channel holes in the side
gears. This effectively turns the internals of the diff into a working oil
pump.
The unit is also extremely quiet and actually provides a bit better race
results due to a bit more progressive lock timing.
OS Giken utilized its accumulated racing knowledge and engineering
experience to develop its own limited slip
differential. Four years of extensive research and development lead to
a new and revolutionary LSD design with the
capacity to house an unprecedented number of friction plates (up to 28
plates in total) and thus the OS Super Lock LSD was born. The increased
number of plates directly has not only dramatically improved our LSD
design's locking force and enables it to lock fully and completely.
An added benefit to being a fully locking mechanism is that less heat
is generated, thus resulting in incredible durability
and reliability.
As expected from OS Giken, our LSDs are not only made from the highest quality materials, our precise machining,
forged gears, and sound engineering makes our LSDs the most durable and reliable race performance LSDs available.
OS Giken's patented design is a revolutionary breakthrough in clutch type
limited slip differential design and allows you to have up to twice the
friction plates compared to conventional designs. OS Giken's quality
craftsmanship and original design enables 100% full locking as well as
unparalleled durability.
A quote from Grassroots Motorsports comparing the Quaife unit to the OS Giken:
Gear differentials like Quaife, use a
series of parallel worm gears to distribute power to the wheel that has
the most traction. The gear differential is typically more expensive
than the other types, but it also has nothing to wear out or adjust.
There is a downside, however: If one wheel is completely unloaded, the
differential can act in the same manner as an open differential, thus
making these units less than ideal for bumpier tracks and off-road use.
The OS Giken clutch type uses friction discs and springs to preload the
differential gears so they dont spin as freely as they would in an
open unit. As the axles try to move at differing speeds, the discs or
clutches slide against each other, resisting this action. The result is
a partially locked-together axle that still allows differential
wheelspin, especially as the clutches wear.
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