Which cars does the Type RS 1-Way Rear LSD with 2-Way Option for CZ4A fit?

Cusco USA lists part number LSD 141 F for the Mitsubishi Lancer Evolution X (CZ4A, 2008-2016), the Mitsubishi Lancer Ralliart (CY4A, 2009-2015), the Mitsubishi Lancer Evolution IX (CT9A, 2005-2007) and the other cars listed under Applications. The Type RS 1-Way Rear LSD with 2-Way Option for CZ4A replaces the factory rear differential, so check the notes on this page for any model or transmission limits before ordering.

What does 1-way mean?

A 1-way LSD locks only under acceleration. When the driver lifts or brakes it stays open like a factory diff, so the car turns in and rotates freely off the throttle. It is the most forgiving setting for a car that is also driven on the street, and the least likely to make the car push on corner entry.

How does the Type RS differ from the Type MZ?

The Type RS sets its initial torque with coil springs that push in the same direction as the activation pressure, so it engages smoothly and quickly with a lower initial torque. The Type MZ uses a high-pressure cone spring, giving it the highest initial torque of any Cusco LSD and a stronger, more linear lock suited to competition.

Can the ramp setting be changed later?

Cusco lists the setting for this unit as 1 way (1 and 2 way). Where Cusco names an alternate or optional ramp set, the unit can be changed over when the differential is opened, so it is best combined with a differential service rather than treated as a quick change at the track.

What should I know before installing it?

The differential carrier must be removed from the car to fit the Cusco unit, so most owners have a drivetrain specialist do it. Plan on fresh gear oil, since Cusco sells its own LSD oil for clutch-type differentials, and read the notes on this page for any extra parts Cusco says the job needs.

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Description

Cusco Type RS 1-Way Rear LSD with 2-Way Option for CZ4A Mitsubishi Lancer Evolution X, Lancer Ralliart, Lancer Evolution IX and Lancer Evolution VIII MR

Cusco’s Type RS 1-Way Rear LSD with 2-Way Option for CZ4A and related Mitsubishi models replaces the factory rear differential with a clutch-type limited-slip unit that uses coil springs to set its initial torque. In 1-way form it locks under acceleration only and stays open off the throttle, so turn-in feels close to stock. Engagement is smoother and quicker than Cusco’s MZ series, and the low initial torque keeps tight turns easy when the diff is not working. Choose it for a road car that also sees track days.

Features

Coil-spring initial torque system with RS springs inside the pressure rings
1-way action: locks on acceleration only
Smoother, quicker engagement than the Cusco MZ series
Clutch-type multi-plate design in place of the factory rear differential

Specifications

Cusco part number: LSD 141 F
Type: Type RS
Action: 1-way
Cusco setting: 1 way (1 & 2 way)
Position: Rear differential

Applications

Mitsubishi Lancer Evolution VI: CP9A | 2000,2001
Mitsubishi Lancer Evolution IV: CN9A | 1997,1998
Mitsubishi Lancer Evolution II: CE9A | 1994,1995
Mitsubishi Lancer Evolution VII: CT9A | 2001,2002
Mitsubishi Lancer Evolution VIII MR: CT9A | 2004,2005
Mitsubishi Lancer Evolution IX: CT9A | 2005-2007
Mitsubishi Lancer Ralliart: CY4A | 2009-2015
Mitsubishi Lancer Evolution III: CE9A | 1995,1996
Mitsubishi Lancer Evolution X: CZ4A | 2008-2016
Mitsubishi Lancer Evolution I: CD9A | 1992,1993
Mitsubishi Lancer Evolution VIII: CT9A | 2003-2005
Mitsubishi Lancer Evolution V: CP9A | 1999

Notes

Fitting the Type RS 1-Way Rear LSD with 2-Way Option for CZ4A means removing the differential carrier to swap the differential; installation labor is not included

Frequently Asked Questions

Which cars does the Type RS 1-Way Rear LSD with 2-Way Option for CZ4A fit? Cusco USA lists part number LSD 141 F for the Mitsubishi Lancer Evolution X (CZ4A, 2008-2016), the Mitsubishi Lancer Ralliart (CY4A, 2009-2015), the Mitsubishi Lancer Evolution IX (CT9A, 2005-2007) and the other cars listed under Applications. The Type RS 1-Way Rear LSD with 2-Way Option for CZ4A replaces the factory rear differential, so check the notes on this page for any model or transmission limits before ordering.
What does 1-way mean? A 1-way LSD locks only under acceleration. When the driver lifts or brakes it stays open like a factory diff, so the car turns in and rotates freely off the throttle. It is the most forgiving setting for a car that is also driven on the street, and the least likely to make the car push on corner entry.
How does the Type RS differ from the Type MZ? The Type RS sets its initial torque with coil springs that push in the same direction as the activation pressure, so it engages smoothly and quickly with a lower initial torque. The Type MZ uses a high-pressure cone spring, giving it the highest initial torque of any Cusco LSD and a stronger, more linear lock suited to competition.
Can the ramp setting be changed later? Cusco lists the setting for this unit as 1 way (1 and 2 way). Where Cusco names an alternate or optional ramp set, the unit can be changed over when the differential is opened, so it is best combined with a differential service rather than treated as a quick change at the track.
What should I know before installing it? The differential carrier must be removed from the car to fit the Cusco unit, so most owners have a drivetrain specialist do it. Plan on fresh gear oil, since Cusco sells its own LSD oil for clutch-type differentials, and read the notes on this page for any extra parts Cusco says the job needs.

About CUSCO

CUSCO is the brand of Carrosser Co., Ltd., founded in December 1977 and based in Takasaki, Gunma Prefecture, Japan. Carrosser designs and builds coilovers, limited-slip differentials, clutches, roll cages and chassis parts, sells its steel cages under the Safety 21 name, and competes in every All Japan Championship category from circuit racing to rally and gymkhana. CUSCO USA, a division of Carrosser, is based in Huntington Beach, California.

Additional Information

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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

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Cusco Type RS 1-Way Rear LSD with 2-Way Option for CZ4A Mitsubishi Lancer Evolution X, Lancer Ralliart, Lancer Evolution IX and Lancer Evolution VIII MR [LSD 141 F]

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Cusco Type RS 1-Way Rear LSD with 2-Way Option for CZ4A Mitsubishi Lancer Evolution X, Lancer Ralliart, Lancer Evolution IX and Lancer Evolution VIII MR

Features

Specifications

Applications

Notes

Frequently Asked Questions

About CUSCO

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