Geared for refinement
Land Rover’s nine-speed transmission delivers a greater sense of control
LAND Rover will demonstrate the latest in a long line of technical firsts at the 2013 Geneva Motor Show with the announcement of the world’s first nine-speed automatic transmission for a passenger car.
The ZF 9HP transmission is specifically designed for transverse applications and is one of the most efficient and technically advanced transmissions ever used in a production vehicle.
Land Rover is the lead partner on the project, working together with ZF who are widely recognised as being the world leader in transmission technology.
Increasing the number of gear ratios from six to nine gives significant improvement in fuel economy and a corresponding reduction in CO2 emissions.
Smaller ratio steps give improved response during acceleration, improved shift quality, drive and refinement.
The higher top gear not only reduces fuel consumption but the lower engine revs improve comfort and reduce noise when cruising at high speed.
The 9HP is extremely robust and perfectly complements Land Rover’s rugged all-terrain ability whilst delivering exceptionally high levels of refinement and efficiency.
The lowest ratio in the 9HP is far lower than found in the existing sixspeed transmission and is specifically designed for off-road use, towing and more extreme on-road conditions like gradients and altitude, giving the driver a heightened sense of control.
With extremely fast gear changes described by ZF as being: ‘‘below the threshold of perception’’, the 9HP is not only highly responsive but proves to be versatile too.
Whereas the existing six-speed transmission makes shifts sequentially, the 9HP has a skip-shift function for much swifter downshifting under rapid deceleration or from greater driver input demands.
The torque converter incorporates a multi-stage damper system for smoother pulling away and improved refinement.
World first: Land Rover is set to unveil its passenger vehicle with the innovative nine-speed automatic transmission.