8 Speed zf transmission service

With the new gear set concept 8HP only needs 5 shift elements for 4 gear sets. And since only two shift elements are opened per gear, drag losses in the transmission are significantly minimized. At the same time, 8HP only needs 3 multidisk clutches and 2 brakes. As a result, 8HP is more efficient than other concepts. This effect is supported by the use of a new parallel-axis vane cell pump. 

 From the lower mid-size car to the sporty luxury segment, and in every SUV - the torque range of 220 to 1,000 Newton meters makes 8HP the perfect choice for all rear and all-wheel concepts. Although 8HP has 2 more gears than 6HP, the dimensions have remained the same while the weight has been reduced by as much as 3%. It now weighs 87 kg with a mid-size 8HP70 transmission including oil. In addition, a total spread of 7.0 always ensures the optimum operating point of the engine - providing greater acceleration with less fuel consumption. 

 The 8HP product family is already well-prepared for more stringent consumption and CO2 guidelines in the future. In upper and middle class vehicles, for example, the optimized 8HP ensures 3% less average consumption and CO2 emissions. This potential can be completely transferred to hybrid drives - without taking any additional savings potential of optimized automatic engine stop functions into consideration. 

In order to achieve all this progress, we have optimized a number of details of 8HP. The advantages at a glance:

Reduced drag torques and engine speed to minimize power loss

Greater transmission spacing and lower system pressures

Multidisk separation of brakes

New torsional dampers for superior hydrodynamic power transmission and further speed reduction