Does the Super Lock LSD for CP9A fit cars with Active Yaw Control?

No. The Super Lock LSD for CP9A and CT9A cars replaces a conventional rear differential, so it is listed for manual Evolutions without Active Yaw Control, such as the RS models. The US-market Evolution VIII and IX were sold without AYC and use a conventional rear differential.

What changes on track?

The Evo rotates more willingly on the throttle and drives harder out of slow corners, because both rear tires keep transmitting torque as the inside one unloads. Drivers often describe the car as more neutral, with less understeer on exit.

Does it work with the factory center differential?

Yes. The center differential still splits torque between the axles. The rear Super Lock then decides how the rear share is divided between the two rear tires, keeping both driving instead of letting the inside one spin. Front-to-rear balance is unchanged.

Is it suitable for a street-driven Evo?

Yes, with the right expectations. OS Giken sets the Super Lock with a low preload, so normal driving changes little, while the gain shows at the limit. Light plate noise in tight parking turns is normal for any clutch-type unit.

Can it be set up for rallycross?

Yes. OS Giken retunes Super Lock units in-house, raising or lowering initial torque and changing lock timing and ramp angles. A rallycross car often benefits from a firmer setting than a road car, and the same unit can be adjusted between them.

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Description

OS Giken Rear Super Lock LSD for CP9A / CT9A Mitsubishi Lancer Evolution IV-IX

OS Giken’s Rear Super Lock LSD for CP9A / CT9A Mitsubishi Lancer Evolution IV-IX gives the 4G63 Evo a clutch-type rear differential in place of the factory unit on cars without Active Yaw Control, which in practice means the RS models and the US-market Evolution VIII and IX. The Evo’s all-wheel-drive balance changes markedly with how the rear axle handles torque, and a rear tire that unloads mid-corner lets drive escape. OS Giken’s patented pressure ring locks both rear wheels progressively under power, freeing the car to rotate on the throttle. It is the part for an Evo used for time attack, rallycross or track days.

Design and Performance

The plates sit on splines through the side gears, so OS Giken fits up to twice the friction plates of competing designs. That allows a light preload for road use and full, progressive lock under power. Gears are raw-forged and all parts are chemically heat treated in a billet-machined case.

Features

Clutch-type rear differential for non-AYC Evolution models
Patented pressure ring for progressive lock and throttle rotation
Up to twice the plate count of competing designs
Light preload for a road-registered car
Billet case and raw-forged gears
Retunable by OS Giken for initial torque and lock timing

Applications

Mitsubishi Lancer Evolution: CP9A IV-VI | 1996-2001 | 2.0L 4G63 turbo
Mitsubishi Lancer Evolution: CT9A VII-IX | 2001-2007 | 2.0L 4G63 turbo

Notes

The Super Lock LSD for CP9A and CT9A cars is listed for manual cars without Active Yaw Control, including RS models and US-market Evolution VIII and IX
Installation labor is not included

Frequently Asked Questions

Does the Super Lock LSD for CP9A fit cars with Active Yaw Control? No. The Super Lock LSD for CP9A and CT9A cars replaces a conventional rear differential, so it is listed for manual Evolutions without Active Yaw Control, such as the RS models. The US-market Evolution VIII and IX were sold without AYC and use a conventional rear differential.
What changes on track? The Evo rotates more willingly on the throttle and drives harder out of slow corners, because both rear tires keep transmitting torque as the inside one unloads. Drivers often describe the car as more neutral, with less understeer on exit.
Does it work with the factory center differential? Yes. The center differential still splits torque between the axles. The rear Super Lock then decides how the rear share is divided between the two rear tires, keeping both driving instead of letting the inside one spin. Front-to-rear balance is unchanged.
Is it suitable for a street-driven Evo? Yes, with the right expectations. OS Giken sets the Super Lock with a low preload, so normal driving changes little, while the gain shows at the limit. Light plate noise in tight parking turns is normal for any clutch-type unit.
Can it be set up for rallycross? Yes. OS Giken retunes Super Lock units in-house, raising or lowering initial torque and changing lock timing and ramp angles. A rallycross car often benefits from a firmer setting than a road car, and the same unit can be adjusted between them.

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 Rear Super Lock LSD for CP9A / CT9A Mitsubishi Lancer Evolution IV-IX [MT031-HA]

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OS Giken Rear Super Lock LSD for CP9A / CT9A Mitsubishi Lancer Evolution IV-IX

Design and Performance

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews