Engines and drivetrains

In Europe, there will be three engine and manual or CVT transmission choices when Nissan Juke sales start in the second half of 2010. At the top of the range is a newly developed 1.6-litre Direct Injection Gasoline turbocharged engine which develops 140kW (190PS) and 240Nm.

A low friction and lightweight design, the 16 valve engine uses direct injection to improve combustion to optimise power and torque, economy and emissions. The addition of a turbocharger and intercooler helps to boost power - this engine is one of the most powerful in its class - while variable timing control for both intake and exhaust cycles (twin VTC) improves low end engine response. A degree of overlap allows exhaust gas recirculation.

Low friction techniques include the adoption of diamond-like carbon (DLC) coating for the valve lifters and mirror finish camshafts. The result is an engine delivering the performance levels of a normally aspirated 2.5-litre engine but with the fuel economy of a smaller engine.

The Direct Injection Gasoline engine in two-wheel drive versions of Nissan Juke will be coupled to a six-speed manual transmission. On the four-wheel drive version, it will be mated to Nissan's XTRONIC CVT transmission, with six-speed manual mode.

The second petrol engine, which also displaces 1.6-litres and has four valves per cylinder, is an extensively reworked member of the HR family. Designated HR16DE, it has undergone a number of significant changes with a larger exhaust manifold, a retuned intake manifold, twin VTC, improved intake tumble flow and new catalyst with a hexagon cell formation.

New pistons with revised crowns and integral oil jet cooling have been adopted along with low friction techniques such as diamond-like carbon coating on the valve lifters.

But the most significant change has been the development of a dual injector system - a world first - which has two injectors for each cylinder, each with smaller nozzles to deliver finer, more closely targeted sprays of fuel into the cylinders for more efficient atomisation and more complete combustion.

Together the changes have led to significant improvements in power, torque and fuel economy. The engine produces 86kW (117PS), representing a six per cent improvement over previous versions of the engine. Torque has improved by three per cent to 157Nm while economy figures show a 5.6 per cent improvement. The normally aspirated petrol engine powers two-wheel drive versions only, and will be available with either the five-speed manual or the updated XTRONIC CVT transmission option, a different CVT transmission to the one used with the DIG engine.

The final engine choice is the familiar Alliance developed K9K 1.5-litre dCi turbocharged common rail diesel. The 1,461cc eight-valve engine delivers good fuel economy, low emissions and running costs with excellent driveability.

With power rated at 81kW (110PS) at 4,000 rpm and torque at an impressive 240 Nm at 1,750 rpm this unit features a fuel return rail and control unit for improved fuel efficiency. Injection pressure is 1,600 bar. Improved glow plug performance speeds up cold start performance. Emission control systems include a diesel particulate filter (DPF), with a fifth injector for regeneration and cooled exhaust gas recirculation while the turbocharger layout altered to make the distance between it and the DPF as short as possible.

The diesel will be available on two-wheel drive models with the six-speed manual transmission. For Europe, all the engines are fully Euro 5 compliant.

While the manual transmission has been carried over largely unchanged from Qashqai, both XTRONIC CVT systems feature a number of key technologies that promise significant improvements in weight, packaging, performance and fuel efficiency.

The updated XTRONIC CVT unit, used with the conventional 1.6-litre petrol engine, is 10 per cent shorter than before and 13 per cent lighter while internal friction has been reduced by a remarkable 30 per cent. This unit is the world's first CVT with a sub planetary gear which allows a far higher transmission ratio - 7.3:1 - than previous Nissan CVTs. Smaller, lighter pulleys, a flexible lock up damper and a more efficient oil pump all promote great fuel efficiency.

The XTRONIC CVT with 6-speed manual mode in the turbocharged petrol-engined Nissan Juke has been tuned for a more sporting performance with revised manual modes for sharper acceleration while the management system has been reprogrammed to enhance fuel efficiency. Both CVTs have adaptive shift control systems that can be selected via the Nissan Dynamic Control System.

Unusually in its class, Nissan Juke will be available with the option of four-wheel drive in addition to conventional front-wheel drive. A newly developed all-wheel drive system is based on Nissan's ALL-MODE 4x4-i electronic technology but which now adds a lateral torque-vectoring capability to its armoury.

As well splitting torque front to rear - upto a maximum of 50:50, it can now be split from side to side across the rear axle, too. By monitoring vehicle speed, wheel speed, gear position, steering angle, lateral G forces and now vehicle yaw rate, torque distribution can be increased to the outside rear wheel in corners to cut understeer and enhance the car's cornering ability. In total, upto 50% of the total available engine torque can be sent to either rear wheel.

The new rear axle incorporates electric couplings at either end plus a new final drive The inclusion of this innovation is a first in the small car segment - a technology that has, until now, only been found on top-of-the-range, premium vehicles.

The new system is noticeably lighter and more compact than similar systems used by some other manufacturers.

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