Cup-shaped spring washer for limited-slip differential 911/912 (69-83) + 911 Turbo (-88) +944 + 914

Our cup-shaped spring washer for the limited-slip differential is used as original equipment on the following vehicle models:

      Porsche 911 S 2.0 L (1969)

      Porsche 911 T 2.0 L (1969)

      Porsche 911 E 2.0 L (1969)

      Porsche 912 1.6 L (1969)

      Porsche 912 E 2.0 L (USA-CAN) (1976)

      Porsche 911 T / 911 E / 911 S 2.2 L (1970-1971)

      Porsche 911 E / 911 S 2.4 L (1972-1973)

      Porsche 911 T-V / 911 T-E / 911 T-K 2.4 L (1972-1973)

      Porsche 911 Carrera 2.7 L (1973-1975)

      Porsche 911 2.7 L (1974-1977)

      Porsche 911 S 2.7 L (1974-1977)

      Porsche 911 Carrera 3.0 L (1976-1977)

      Porsche 911 SC 3.0 L (1978-1983)

      Porsche 911 Turbo 3.0 L (1975-1977)

      Porsche 911 Turbo 3.3 L (1978-1988) *

      Porsche 924 2.0 L (1978-1985) **

      Porsche 924 Turbo 2.0 L (1979-1984) **

      Porsche 924 Carrera GT 2.0 L (1981) **

      Porsche 924 S 2.5 L (1986-1988)

      Porsche 928 4.5 L (1978-1982) **

      Porsche 928 S 4.7 L (1980-1983) **

      Porsche 928 S 4.7 L (1983) ***

      Porsche 944  2.5 L (1982-1988) **

      Porsche 944 2.7 L (1989) **

      Porsche 944 S 2.5 L (1987-1988) **

      Porsche 944 S-2 3.0 L (1989-1991) **

      Porsche 944 Turbo 2.5 L (1986-1991) **

      Porsche 944 Turbo S 2.5 L (1987-1988) **

      Porsche 914-4 1.7 L (1970-1973)

      Porsche 914-4 1.8 L (USA/CAL) (1974-1976)

      Porsche 914-4 Type V 1.8 L (1974-1976)

      Porsche 914-4 2.0 L (1973-1976)

      Porsche 914-6 2.0 L (1970-1972)

Notes:

This concave washer is only used on vehicles that are equipped with the limited-slip differential option (Option code M220)

* For vehicles with Type 930 4-speed manual transmissions.

** For vehicles with 5-speed manual transmissions only.

*** For vehicles with 3 and 4-speed automatic transmissions.

This curved washer located inside the limited-slip differential housing acts as a spring by applying a measured amount of pressure on the LSD’s internal clutch plates. This effectively modulates the torque bias delivered to each of the vehicle’s wheels as a function to their traction and individual rotational speed.

When the cup-shaped washer flattens out and loses its convex shape, the spring effect on the LSD’s internal clutch plates is reduced. This in turn limits the ability of the LSD to regulate the torque bias ratio delivered to each wheel and renders the LSD less effective.

Cup-washer thickness: ≈2 mm.

Quantity required per vehicle: 2 (placed at both ends inside the limited slip differenctial housing)