Why does the Super Lock LSD for E82 fit a manual 135i but an automatic 335i?

The Super Lock LSD for E82 and E9X cars is matched to a rear axle specification, not a model name. Turn 14 lists the six-speed manual 135i and the automatic 335i for part number BM531-HA. Other transmission and final drive combinations should be confirmed with Bulletproof Automotive before ordering.

What does it gain over the electronic traction aids?

BMW brakes a spinning wheel and cuts power to manage traction. A mechanical LSD sends torque to the wheel with grip instead, so the car accelerates harder rather than being held back. On a tuned car the difference on launches and corner exits is substantial.

Is it strong enough for a big-turbo N54?

The Super Lock has up to twice the friction plates of competing designs, giving it the clamping area for high torque. OS Giken can raise initial torque for drag use and fit TCD spec discs for oil cooling over repeated runs.

Is it good for drifting?

Yes. Locking both rear wheels under power is what lets a car hold a slide, and an open differential cannot do it. The Super Lock makes slides predictable, and the 135i in particular becomes a capable drift car with one fitted.

Will it be noisy on the road?

OS Giken sets the Super Lock with a modest preload, and its Japanese catalogue rates the design among the quietest LSDs in town. Mild plate noise in tight parking turns is normal with any clutch-type differential. Normal driving is unaffected.

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Description

OS Giken Super Lock LSD for E82 BMW 135i Manual and E9X 335i Automatic

OS Giken’s Super Lock LSD for E82 BMW 135i Manual and E9X 335i Automatic gives the turbocharged N54 and N55 cars the mechanical limited-slip differential BMW never fitted, relying instead on brake-based electronic traction aids. A tuned 135i or 335i makes well over its factory torque from low rpm, and an open rear differential lets that torque escape through the inside tire on any corner exit or wet launch, with the stability system cutting power in response. OS Giken’s patented pressure ring locks both rear wheels progressively. It is the drivetrain upgrade for a tuned N54 or N55 car that sees the track, the strip or a drift day.

Fitment Notes

OS Giken USA and Turn 14 list this unit for the six-speed manual 135i and the automatic 335i, which reflects the rear axle specification of those cars rather than the model names. Check the transmission and final drive of the car before ordering, since BMW used several ratios across the 1 Series and 3 Series ranges.

Features

Mechanical LSD for cars BMW sold with an open differential
Suited to tuned N54 and N55 torque
Patented pressure ring for progressive lock
Up to twice the friction plates of competing designs
Billet case and raw-forged gears
Retunable for drag, drift or circuit use

Applications

BMW 135i: E82 / E88 | 2008-2013 | 3.0L N54 / N55 turbo, six-speed manual
BMW 335i: E90 / E92 | 2007-2013 | 3.0L N54 / N55 turbo, automatic

Notes

The Super Lock LSD for E82 135i manual and E9X 335i automatic cars is listed for those combinations; other transmission and final drive combinations should be confirmed
Installation labor is not included

Frequently Asked Questions

Why does the Super Lock LSD for E82 fit a manual 135i but an automatic 335i? The Super Lock LSD for E82 and E9X cars is matched to a rear axle specification, not a model name. Turn 14 lists the six-speed manual 135i and the automatic 335i for part number BM531-HA. Other transmission and final drive combinations should be confirmed with Bulletproof Automotive before ordering.
What does it gain over the electronic traction aids? BMW brakes a spinning wheel and cuts power to manage traction. A mechanical LSD sends torque to the wheel with grip instead, so the car accelerates harder rather than being held back. On a tuned car the difference on launches and corner exits is substantial.
Is it strong enough for a big-turbo N54? The Super Lock has up to twice the friction plates of competing designs, giving it the clamping area for high torque. OS Giken can raise initial torque for drag use and fit TCD spec discs for oil cooling over repeated runs.
Is it good for drifting? Yes. Locking both rear wheels under power is what lets a car hold a slide, and an open differential cannot do it. The Super Lock makes slides predictable, and the 135i in particular becomes a capable drift car with one fitted.
Will it be noisy on the road? OS Giken sets the Super Lock with a modest preload, and its Japanese catalogue rates the design among the quietest LSDs in town. Mild plate noise in tight parking turns is normal with any clutch-type differential. Normal driving is unaffected.

About OS Giken

OS Giken was founded in Okayama, Japan in 1973 by Masaharu Okazaki. It built the TC16 and TC24-B1 DOHC cylinder heads for Nissan L-series engines, began making multi-plate racing clutches in 1982 and started supplying OEM limited-slip differentials in 1983. Development of the Super Lock LSD began in 1997, and of the OS-88 sequential gearbox for the Skyline GT-R in 1998.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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OS Giken Super Lock LSD for E82 BMW 135i Manual and E9X 335i Automatic [BM531-HA]

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OS Giken Super Lock LSD for E82 BMW 135i Manual and E9X 335i Automatic

Fitment Notes

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews