DIFFERENTIAL SYSTEM


  1. OUTLINE


    1. Rear Differential


      1. An FD21CT type rear differential with the TORSEN* Limited Slip Differential (LSD) is used on models without the Torque Vectoring Differential system. By optimally distributing drive torque in accordance with acceleration, a high level of traction performance, operability and driving stability have been achieved.

        Tech Tips

        *: TORSEN is a registered trade mark of JTEKT Corporation.

      2. An FD21CF type Torque Vectoring Differential (TVD) is used on models with the Torque Vectoring Differential system. The Torque Vectoring Differential system controls the torque distribution between the rear wheels using torque transfer modules located on the left and right sides of the rear differential, and is unaffected by acceleration or varying engine torque. A high level of traction performance, operability and driving stability have been achieved.

      3. A lightweight carrier with optimized thickness and streamlined ribs is used.

      4. Low viscosity oil is used, thus ensuring good fuel consumption.

  2. SPECIFICATION

    Differential Type FD21CT FD21CF
    Differential Gear Ratio 2.937 2.937
    Ring Gear Size mm (in.) 208 (8.2) 208 (8.2)
    Drive Pinion No. of Teeth 16 16
    Ring Gear No. of Teeth 47 47
    No. of Differential Pinion 10 2
    Differential Unit Oil Capacity Liters (US qts, Imp. qts) 1.35 (1.4, 1.2) 1.35 (1.4, 1.2)
    Oil Viscosity SAE 75W-85 SAE 75W-85
    Oil Grade API GL-5 API GL-5
    Torque Vectoring Differential Module Fluid Capacity Left Side Liters (US qts, Imp. qts) - 0.70 (0.7, 0.6)
    Right Side 0.70 (0.7, 0.6)
    Fluid Type - Toyota Genuine ATF WS or Equivalent

    Weight (Reference)*

    		kg (lb) 39.8 (87.7) 69.2 (152.6)

    *: The figure shown is the weight of the part with fluid.

  3. MAIN FEATURES


    1. TORSEN LSD


      1. The TORSEN LSD responds well to changes in the road surface when driving straight, thus ensuring straight-line stability.

        A01FJLLE01

      2. The TORSEN LSD reacts to limit the torque difference between the left and right wheels, thus distributing the coast torque generated by engine braking from the inner wheel to the outer wheel when decelerating during turning. As a result, a yaw moment opposite to the direction of the turn is generated, thus ensuring vehicle stability.

        A01FJDLC01
        B004H73 Coast Torque B004HAI Torque Distribution
        A01FJG8 Yaw Moment - -

      3. The TORSEN LSD reduces drive torque sent to the inner wheel and distributes it to the outer wheel when the inner wheel is slipping during acceleration while turning. As a result, a yaw moment in the turning direction is generated, thus achieving a high level of traction performance and operability.

        A01FJA9C01
        B004H73 Drive Torque B004HAI Torque Distribution
        A01FJG8 Yaw Moment - -

        Note


        • Do not add drive torque with only one of the rear wheels on the ground or with one of the rear wheels spinning. The structure of the TORSEN LSD transmits drive torque to the stopped wheel, which may cause the vehicle to move suddenly without any warning. Also, the differential mechanism may suffer damage in the above situation, possibly leading to a malfunction.

        • For the left and right rear wheels, equip tires of the same type and size which have roughly similar amounts of wear.