Which cars does the Type MZ 2-Way Rear LSD for FC3S fit?

Cusco USA lists part number LSD 565 K2 for the Mazda RX-7 (FC3S, 1986-1991). The Type MZ 2-Way Rear LSD for FC3S replaces the factory rear differential, so check the notes on this page for any model or transmission limits before ordering.

What does 2-way mean?

A 2-way LSD locks under deceleration as well as acceleration. The driven wheels stay tied together when the driver lifts or brakes, which keeps the car stable and predictable in a slide and on hard braking. The trade-off is more push on corner entry and heavier manners at parking speeds, so it suits drift and dedicated competition cars.

How does the Type MZ differ from the Type RS?

The Type MZ uses a high-pressure cone spring that works against the activation pressure, which gives it the highest initial torque of any Cusco LSD and a linear build to full lock. The Type RS uses coil springs for a lower initial torque and smoother, quicker engagement, which makes it the friendlier choice for a street car.

Can the ramp setting be changed later?

Cusco lists the setting for this unit as 2 way (1.5 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 MZ 2-Way Rear LSD for FC3S Mazda RX-7

Cusco’s Type MZ 2-Way Rear LSD for FC3S Mazda RX-7 replaces the factory rear differential with a clutch-type limited-slip unit built around a high-pressure cone spring, which gives the Type MZ the highest initial torque of any Cusco LSD. As a 2-way it locks under acceleration and deceleration alike, which keeps the car stable on the brakes and holds both wheels together through a slide. The cone spring brings the clutch pack to full lock at a linear rate, so the locking effect builds predictably. It suits drift, rally and other competition use, where maximum lock in both directions is wanted.

Design and Performance

In the Type MZ the activation pressure works against a high-pressure cone spring, so the diff engages once those opposing forces meet. That cone spring gives the MZ the highest initial torque of any Cusco LSD and brings the clutch pack to full lock at a linear rate, so the Type MZ 2-Way Rear LSD for FC3S behaves the same way corner after corner.

Features

High-pressure cone spring for the highest initial torque in the Cusco range
2-way action: locks on acceleration and deceleration
Linear build to full clutch-pack lock
Clutch-type multi-plate design in place of the factory rear differential
Built for the RX-7

Specifications

Cusco part number: LSD 565 K2
Type: Type MZ
Action: 2-way
Cusco setting: 2 way (1.5 & 2 way)
Position: Rear differential

Applications

Mazda RX-7: FC3S | 1986, 1986-1991 | MT, OEM Diff : Viscous, 13BT

Notes

Fitting the Type MZ 2-Way Rear LSD for FC3S means removing the differential carrier to swap the differential; installation labor is not included

Frequently Asked Questions

Which cars does the Type MZ 2-Way Rear LSD for FC3S fit? Cusco USA lists part number LSD 565 K2 for the Mazda RX-7 (FC3S, 1986-1991). The Type MZ 2-Way Rear LSD for FC3S replaces the factory rear differential, so check the notes on this page for any model or transmission limits before ordering.
What does 2-way mean? A 2-way LSD locks under deceleration as well as acceleration. The driven wheels stay tied together when the driver lifts or brakes, which keeps the car stable and predictable in a slide and on hard braking. The trade-off is more push on corner entry and heavier manners at parking speeds, so it suits drift and dedicated competition cars.
How does the Type MZ differ from the Type RS? The Type MZ uses a high-pressure cone spring that works against the activation pressure, which gives it the highest initial torque of any Cusco LSD and a linear build to full lock. The Type RS uses coil springs for a lower initial torque and smoother, quicker engagement, which makes it the friendlier choice for a street car.
Can the ramp setting be changed later? Cusco lists the setting for this unit as 2 way (1.5 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.

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BP Pricing Difference

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Cusco Type MZ 2-Way Rear LSD for FC3S Mazda RX-7 [LSD 565 K2]

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Cusco Type MZ 2-Way Rear LSD for FC3S Mazda RX-7

Design and Performance

Features

Specifications

Applications

Notes

Frequently Asked Questions

About CUSCO

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