The choice of enthusiasts and racers who want
"the best" clutch type LSD available
Up until recently, very few enthusiasts in BMW land knew the name
OS Giken [pronounced (oh. ess. gee-ken)]. However they
are a genuinely legendary tuner and manufacture of super high end
race parts from Japan. Sensing the BMW market was in dire need of
performance differentials, OSG developed their unique LSD
technology for the BMW market.
Already rapidly becoming the choice of the Porsche where rear
engine layouts and high horsepower require perfect control and
stability, the BMW racer and enthusiast can also immediately
appreciate the excellence of design and performance the OS Giken
offers to their vehicle from the moment they drive.
The OS Giken Super Lock LSDs are much like other clutch
type LSDs in that they offer the quick, positive response that some
drivers prefer Vs. a gear based / torque biasing differential...
However, some of the standout features the OS Giken has involve it
doing it's job better than any of its clutch type competitors:
- Extreme performance; capable of 100% locking on demand
- 20 Clutchplates! Many clutch-style units only have between 4
and 8 total!
- Incredibly smooth response; suitable for comfortable daily
street use
- Durable; extremely long life for both street or track use-
tested to maintain performance over a vehicles entire lifespan
- Strong; nearly unbreakable- used as delivered by professional
drifters and championship racers
- Precision machining; long life and ready to use out of the box,
no break in required
We price match wherever possible! We also
stock pre-built complete differential housings with LSDs
installed!
**Installation notes**
Most 135 &
335 are equipped with a welded ring and pinion gear, designed to
make it nearly impossible for most facilities to install an
aftermarket LSD. As the leaders in performance differentials for
these cars, we have made the investment in the technology needed
in-house so we can supply you a VAC pre-built performance
differential wherever you live.
As the master importer for Quaife, and a main stocking dealer for
OS Giken & Wavetrac, we have the special machines and
techniques for fitting this and other LSDs into your OEM
differential! No more waiting and overpaying for early cores,
chasing shims, and no extended downtime as you send your diff out!
OS recommends the first fluid change after 1 event or 500-1000
miles in order to flush out debris left over from the manufacturing
process. Subsequent changes are recommended at the normal
factory-recommended intervals.
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Awesome technical info from OS
Giken:
Superior Design
- Miniaturized pressure ring and a superior
spline-through-side-gear design allows for fitment of more friction
plates (up to 2x as many as competitors versions), offering true
100% lock capability.
- Patented pressure ring design allows for smooth, progressive
locking
- Case has a relief cut-out for the cone spring, for minimized
cone-spring flexing and enhanced durability.
Superior Construction
- All components are chemically heat treated for maximum
durability
- All components are constructed with high-grade steel alloy
- Gears are raw-forged for maximum strength
- Disks are precision-machined simultaneously on both sides to
extremely tight tolerances
- Case is billet construction
Tunability
- Initial torque can be adjusted by using thicker / thinner cone
springs
- lock progression timing can be adjusted by using stiffer /
weaker pressure ring springs
- ramp angles can be customized by swapping the pressure ring and
iron cross
- disks can be swapped to TCD type for enhanced oil flow
properties
Superior Overall Performance
- The OS LSD standard spec allows for low preload while still
retaining a fully progressive 100% lock capability; basically, the
vehicle will feel like driving on an open diff in slow turns /
street driving, but can still transmit maximum power to the drive
wheels under load.
- Operation is ultra quiet, and the progressive locking allows
for smooth, predictable locking. Especially when replacing an open
diff, equipping OS LSD will completely improve the driving
experience while maintaining everyday drivability. With OS LSD
equipped, inside wheel spin can essentially be eliminated, and
throttle steering becomes unequivocal.
- Due to the precision manufacturing, high-grade materials /
processes used, and superior design, no break-in period is required
for OS LSD, and no rebuilds are required. OS LSD is purposefully
over-engineered to offer the best performing, most durable
clutch-type LSD available.
- Aside from the performance advantage and stock-like feel at
slow speeds, vehicles equipped with OS LSD are more stable in all
road/weather conditions, allowing for a safer driving
experience.
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Highly Recommend This Unit
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