Which cars does the Type RS 1-Way Rear LSD for NDERE fit?

Cusco USA lists part number LSD 431 F for the Mazda MX-5 Miata (NDERE, 2016-2026). The Type RS 1-Way Rear LSD for NDERE 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), 55/0 (default) and 55/55 deg ramp. 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 for NDERE Mazda MX-5 Miata

Cusco’s Type RS 1-Way Rear LSD for NDERE Mazda MX-5 Miata 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.

Design and Performance

Small RS springs inside the pressure rings load the clutch plates before any drive torque arrives. Because they push in the same direction as the initial torque, the plates engage quickly and progressively, and adding or removing springs moves the initial torque up or down. Under power the cams add locking force in step with torque, so the Type RS 1-Way Rear LSD for NDERE holds the driven wheels together harder as the engine pulls harder.

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
Built for the MX-5 Miata

Specifications

Cusco part number: LSD 431 F
Type: Type RS
Action: 1-way
Cusco setting: 1-way (1 & 2-way), 55/0 (default) & 55/55 deg ramp
Position: Rear differential

Applications

Mazda MX-5 Miata: NDERE | 2016-2026 | 2.0L (PE-VPS), RWD

Notes

Fitting the Type RS 1-Way Rear LSD for NDERE 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 for NDERE fit? Cusco USA lists part number LSD 431 F for the Mazda MX-5 Miata (NDERE, 2016-2026). The Type RS 1-Way Rear LSD for NDERE 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), 55/0 (default) and 55/55 deg ramp. 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.

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BP Pricing Difference

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Cusco Type RS 1-Way Rear LSD for NDERE Mazda MX-5 Miata [LSD 431 F]

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Cusco Type RS 1-Way Rear LSD for NDERE Mazda MX-5 Miata

Design and Performance

Features

Specifications

Applications

Notes

Frequently Asked Questions

About CUSCO

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