Does the Super Lock LSD for FK8 also fit the FL5?

Yes. OS Giken lists part number HA082-HA for both the FK8 and the FL5 Civic Type R, and its Japanese fitment table marks both cars as a direct fit with no machining of the transmission case. Both generations use the 2.0L K20C1 turbo engine and a six-speed manual, so the same Super Lock LSD for FK8 and FL5 owners goes into either car.

How is it different from the factory helical LSD?

The factory unit is a torque-sensing helical differential, which can only bias torque while both front tires carry load. The OS Giken unit is a clutch-type LSD that uses friction plates and a pressure ring to lock progressively under power, so drive continues through the loaded tire on corner exit. The trade-off is that plate wear makes a clutch LSD a serviceable part over its life.

What does 1.1-way mean on a front-drive car?

A 1.1-way LSD locks strongly under acceleration and only lightly on deceleration. OS Giken uses this setting on front-drive cars in its SPEC-S tune so that turn-in and lift-off behavior stay close to the factory feel, while drive out of the corner gains the full locking effect. It suits a car that is driven on the street during the week and on track at the weekend.

Is it noisy or harsh on the street?

No. OS Giken designs the Super Lock to run a low preload while still reaching full lock progressively, and its Japanese catalogue describes the SPEC-S tune as among the quietest LSDs on the market in city driving. Low preload is also what keeps tight parking-lot turns from feeling stiff, where high-preload race differentials are least pleasant.

Can the LSD be retuned later if I add power?

Yes. OS Giken offers in-house retuning of new and used Super Lock units. Initial torque is changed with thicker or thinner cone springs, the timing of full lock with stiffer or softer pressure ring springs, and the ramp angles by swapping the pressure ring and iron cross. TCD spec discs can also be fitted for better oil cooling and smoother operation.

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Description

OS Giken Super Lock LSD for FK8 / FL5 Honda Civic Type R

OS Giken’s Super Lock LSD for FK8 / FL5 Honda Civic Type R replaces the factory helical differential with a multi-plate, clutch-type unit built around the patented pressure ring OS Giken has refined in Okayama since 1997. A helical diff loses its torque bias the moment the inside front tire goes light on the exit of a tight hairpin; the Super Lock keeps both front wheels driving through that phase. In its SPEC-S tune it runs 1.1-way on front-drive cars, so turn-in and lift-off stay close to stock while the car pulls harder out of the corner. For the K20C1 owner who tracks the car, it is the right next step.

Design and Performance

The friction plates run on splines that pass through the side gears, a layout that fits up to twice the plate count of competing designs. More plate area spreads the clamping load, so the unit can run a low preload for daily driving and still progress smoothly to full lock under power. The case is machined from a single billet, the gears are raw-forged, and every component is chemically heat treated.

Features

Patented pressure ring design for smooth, progressive lock-up
Spline-through-side-gear construction carrying up to twice the friction plates of competing designs
1.1-way action on front-drive cars in the SPEC-S tune
Billet-machined case for consistent dimensions
Clutch discs machined on both faces at once to tight flatness tolerances
Rebuildable and retunable by OS Giken as power rises

Applications

Honda Civic Type R: FK8 | 2017-2021 | 2.0L K20C1 turbo
Honda Civic Type R: FL5 | 2023-present | 2.0L K20C1 turbo

Notes

Fitting the Super Lock LSD for FK8 and FL5 cars means removing and splitting the transmission; installation labor is not included
OS Giken lists this unit as a direct fit on the FK8 and FL5 with no case machining
One part number, HA082-HA, covers both generations

Frequently Asked Questions

Does the Super Lock LSD for FK8 also fit the FL5? Yes. OS Giken lists part number HA082-HA for both the FK8 and the FL5 Civic Type R, and its Japanese fitment table marks both cars as a direct fit with no machining of the transmission case. Both generations use the 2.0L K20C1 turbo engine and a six-speed manual, so the same Super Lock LSD for FK8 and FL5 owners goes into either car.
How is it different from the factory helical LSD? The factory unit is a torque-sensing helical differential, which can only bias torque while both front tires carry load. The OS Giken unit is a clutch-type LSD that uses friction plates and a pressure ring to lock progressively under power, so drive continues through the loaded tire on corner exit. The trade-off is that plate wear makes a clutch LSD a serviceable part over its life.
What does 1.1-way mean on a front-drive car? A 1.1-way LSD locks strongly under acceleration and only lightly on deceleration. OS Giken uses this setting on front-drive cars in its SPEC-S tune so that turn-in and lift-off behavior stay close to the factory feel, while drive out of the corner gains the full locking effect. It suits a car that is driven on the street during the week and on track at the weekend.
Is it noisy or harsh on the street? No. OS Giken designs the Super Lock to run a low preload while still reaching full lock progressively, and its Japanese catalogue describes the SPEC-S tune as among the quietest LSDs on the market in city driving. Low preload is also what keeps tight parking-lot turns from feeling stiff, where high-preload race differentials are least pleasant.
Can the LSD be retuned later if I add power? Yes. OS Giken offers in-house retuning of new and used Super Lock units. Initial torque is changed with thicker or thinner cone springs, the timing of full lock with stiffer or softer pressure ring springs, and the ramp angles by swapping the pressure ring and iron cross. TCD spec discs can also be fitted for better oil cooling and smoother operation.

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

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BP Pricing Difference

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