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The ZF 8HP45 is an advanced and well-performing 8-speed automatic transmission. It achieves an excellent balance among smoothness, fuel economy and reliability, and is the core powertrain component for BMW longitudinal engine models in the 2010s.

1. Compact gear mechanism

The 8HP45 incorporates 4 planetary gear sets and 5 shift elements (2 brakes + 3 clutches), and achieves the switching of 8 forward gears through a precise hydraulic control system. During shifting, 3 elements are always engaged while 2 elements are disengaged, effectively reducing the running drag resistance. 

2. Efficient Hydraulic Torque Converter

The 8HP45 is equipped with a hydraulic torque converter featuring a lock-up clutch, which enables a hard connection between the engine and the gearbox in a wider range of operating conditions, reducing power loss. Additionally, this torque converter incorporates a torsional vibration damper, further enhancing the smoothness during low-speed driving. 

3. Excellent shifting logic

Small gear ratio difference: The difference in gear ratios between adjacent gears is controlled within 1.5, resulting in minimal shifting shock and excellent smoothness. 

Shift between gears: It is possible to change gears across 1 or 2 gears from any gear position. 

Direct gear position: The 6th gear is a direct gear position with a gear ratio of 1.00, featuring high transmission efficiency. 

4. Fuel Economy

Compared to the previous 6-speed automatic transmission (6HP series), the 8HP45 can further reduce fuel consumption and carbon dioxide emissions by approximately 6%.

Applicable models: BMW X5, BMW X6, 523Li, 2.5L, 2009 - 2013