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OS Giken Super Lock Limited Slip Clutch Type Differential, BMW E92 135i / 335i

E87 E90 E92 E93 - NON M

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Price: $1,850.00

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SKU: OSG-LSD-SL-E90-335

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Description

The OS Super Lock LSD is the culmination of over four years of extensive research and development leading to a revolutionary LSD design. With the capacity to house an unprecedented number of friction plates (up to 28 plates in total) and combined with our patented lock timing system;, the Super Lock LSD is able to achieve complete lock in a progressive, smooth, and quiet manner. This effort translates to quick lap times and repeatable tuning and performance.

****BM531-HA Applies to Large Housing Type LSD ONLY****

135i and 335i Chart

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.
LSD case has a relief cut-out for the cone spring, resulting in minimal cone spring degradation and enhanced durability.

Superior Construction

All components are chemically heat treated for maximum durability
All components are constructed from a high-grade steel alloy
Gears are raw-forged for maximum strength
Clutch disks are precision-machined simultaneously on both sides to extremely tight tolerances resulting in minimal warpage.
LSD case is machined from a single billet piece to ensure uniformity.

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.
Due to the precision manufacturing, high-grade materials, and unique design, a break-in period nor rebuild is required for OS Giken LSD’s. 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.

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, allowing the progression of full lock to be fine-tuned to the vehicle/driver.
Ramp angles can be customized by swapping the pressure ring and iron cross for even more tuning possibilities.
TCD spec disks can be installed for increased oil cooling and even smoother operation.

Customer Reviews (1)

Average Rating: (From 1 Review):

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Highly Recommend This Unit
From Anonymous of Philly Suburb, Pennsylvania on 4/15/2012.

I'm very pleased with this LSD & VAC's no-nonsense professionalism. I highly recommend that this unit be installed into a differential housing by VAC Motorsports as there are multiple specs and clearances such as ring and pinion contact patch, backlash, end play, etc, etc., which must be set up using precise tolerances. Most shops aren't going be equipped with the necessary shim/snap rings to accommodate all installations due to manufacturing differences. Not to mention the machinery necessary during the processes of separating the ring gear and machining it to spec. I opted for the OS Giken's Superlock rather than the TCD unit because I am hardly, if ever, a hot-rodder and will likely never track the car. Of the 1,200 miles I've driven while breaking the unit in, I can not perceive any differences between this LSD and the stock open differential during normal street and highway conditions! That is to say: to its credit, it's operation is; smooth (no inner tire chirping or snarling one wheel rear end kick-outs while initiating turns); silent (no startling bangs/clangs or embarrassing crackling/popping noises while accelerating, decelerating, coasting or backing up; and imperceptible/unobtrusive during non-aggressive driving conditions because of the unit's positive disengagement thanks to its counter-sprung inner locking mechanism. During turns at higher speeds, I can feel the rear end "hunkering down" progressively and predictably as the load is increased. Gone is that "wishy-washy teetering bouncy floaty feel" at the rear end. I was also pleasantly surprised when my car felt like it was riding on rails rather than "bouncily pushing out" when I found myself going around a corner way too fast while having to decelerate (oops)............for those of you who know proper car lingo, I apologize for lacking the "correct vocabulary" to explain the preceding "descriptions." As of now, I have yet to experience any conflicts between this LSD and the factory's eLSD (electronically-simulated LSD) and/or the ABS (Anti-lock Braking System). For those of you contemplating this upgrade, I can without any reservation recommend this unit and VAC Motorsports.

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