German maker ZF has designed and rolled out an automatic transmission for transverse engine installations that contains no fewer than nine gears, known as the 9HP. It's all in the service of more efficient gearing that matches closely to the engine's most efficient range, thereby lowering fuel consumption.
Last month we had a chance to drive two pre-production prototypes of the 2014 Range Rover Evoque that will use the new nine-speed, first announced in February.
Gasoline and diesel
The first, with left-hand drive, was fitted with the 240-horsepower, 2.0-liter turbocharged gasoline engine that is the Evoque's sole engine option in the U.S. market. But ZF had also provided a right-hand-drive Evoque SD4, the 2.2-liter turbodiesel sold in Europe, for comparison purposes.
In the gasoline Evoque, while starting up and moving away from a stop, you may never notice the difference in the number of gears.
Smooth, fast shifts
If you pay attention, you might register that the shifts are just a little bit quicker, with less lag between them, and the ratios are a bit closer.
Whether on full throttle or under only partial acceleration, the gasoline turbo four and nine-speed play well together.
By the time we reached 70 mph on the test track, the transmission was only in fifth gear, and the engine was turning only 2,100 rpm--against a speed several hundred RPM higher with the old six-speed automatic.
At 100 mph, it took lifting off to get the ZF automatic into its ninth and final gear--and the engine was still running notably slower than it would have in top gear with a six-speed.
ZF 9-speed automatic transmission for transverse enginesEnlarge Photo
But our short drive suggested that to get the most out of the closely spaced ratios, you may find that leaving the control logic to its own devices and letting it shift automatically produces better results.
The diesel Evoque SD4 was notably slower on acceleration, not to mention it added half a second or so for the start-stop system to restart the diesel engine as soon as the driver's foot began to lift off the brake pedal.
The diesel was louder as well as slower, but we'd expect it to deliver far better fuel efficiency than the often-thirsty turbo 2.0-liter in the Evoque--regardless of the number of gears.
2014 Range Rover Evoques on display after ZF Drive Day, Jul 2013Enlarge Photo
The same nine-speed automatic will debut in a U.S. brand in the 2014 Jeep Cherokee, which will pair it in some models with an all-new four-wheel-drive system designed by Jeep.
In the Evoque, the existing all-wheel drive system is an adaptation of one used by Land Rover's former sister company, Volvo.
ZF provided airfare, lodging, and meals to enable High Gear Media to bring you this first-person drive report._______________________________________