The ZF 8-Speed transmission is a well-balanced unit that seamlessly fits into powertrain management systems. With a blend of shift quality, gear ratios, unit footprint, efficiency, and durability in one package, it produces stellar performance under every conceivable situation. Weber State University (WSU) - Automotive Technology Department - Transmission Lab. This episode demonstrates the components and operation of the ZF 8HP 8-sp. With the development of the new 8-speed automatic transmission by ZF, the focus is not on the number of speeds but rather on the minimization of fuel consumption. The new 8HP 8-speed automatic transmission, which was designed to be more lightweight, sets new standards for flexibility, efficiency, and economy. The ZF 8HP, also known as the ZF 8-Speed, is not a standard automatic transmission. It's actually a breakthrough for transmission performance in general as it not only provides lightning-quick smooth shifts, but it also offers a wide range of potential applications. So with that out of the way, let us take a look at the ZF 8hp. There are various CAD renders available from the ZF website, one of them is shown in Fig. There are 4 simple planetary gear sets, and since package space is not at a premium, the gear sets are not nested like they are for the 9 speed.
Zf 8hp Transmission Filter Kit
It debuted in 2008 on the BMW 7 Series 760Li sedan that featured the mighty V12 engine. Since then, all new BMW models with rear or all-wheel-drive can be equipped with this transmission and updated versions are used by many manufacturers such as Volkswagen, Audi, Bentley, Rolls-Royce, Aston Martin, Dodge or Lamborghini.
Its revolutionary design revealed an entirely new gear set concept with four gearsets that require only five shift elements, of which only two are open in any given gear.
The longitudinal gearbox uses three multi-disc clutches, two brakes, and a new parallel-axis vane-type oil pump that enables it to be far more efficient than other automatic transmissions, with drag losses being significantly reduced due to this layout.
The dimensions have remained unchanged from the highly successful six-speed transmission it replaced, even though it has two extra gears. Moreover, weight was reduced by around 3%, making the initial 8HP70 modular system weigh just 87 kg (192 lbs.), including transmission oil.
FCA US LLC started to use this transmission on their vehicles as well, and by 2013, in order to reduce costs, they reached a supply and license agreement with ZF and started production of the transmission in the U.S. market it under the Torqueflite 8 moniker, which is used by the likes of the Dodge Challenger or Jeep Grand Cherokee SRT Trackhawk.
The second generation of this gearbox was released in 2014 and further maximized efficiency, with ZF claiming a 3% reduction in fuel consumption over the first generation.
Improvements included a wider gear ratio spread of 7.8:1, reduced drag torque from the shift elements, reduction in the oil pump pressure, and extended compatibility with coasting and start-stop systems.
Four years later, the third generation of the 8HP was introduced, this time fuel consumption was reduced by an additional 2.5% and the gear ratio spread was modified to 8.6. It featured several maximum torque versions, and for the first time, it was compatible with 48v hybrid power units, incorporating boosting and recuperation capabilities.
The fourth generation is set to be released soon and it will be ZF’s most versatile transmission, being compatible with traditional combustion engines and hybrid units.
it is equipped with an improved, highly powerful motor that further improves fuel efficiency reduces emissions even more compared to traditional transmissions and elevates the overall performance of the gearbox.
This transmission will be used in a variety of rear-wheel and all-wheel-drive vehicles, from regular, midsize to high-performance cars, SUVs, and off-road trucks due to its multiple versions that can handle engine torques that range from 300 to 1000 Newton meters.
It is a worthy alternative to dual-clutch transmissions due to its low cost, durability, and modular architecture that makes it easy to fit on a wide range of vehicles.