Available as a 3-door and 5-door versions, Toyota’s newly developed 2.8 D-4D Global Diesel (GD) engine combines for an 11% increase in low speed torque and a 7% increase in maximum torque, with a 9% reduction in fuel consumption. The engine features Toyota’s first-ever urea Selective Catalytic Reduction (SCR) system that can eliminate up to 99% of NOx emissions, one of the main causes of air pollution.
The new 2,755 cc, 16 valve, DOHC four-cylinder engine comes equipped with a new, variable nozzle turbocharger with intercooler and develops 177 hp at 3,400 rpm and 370 Nm of torque from 1,200 rpm The powerplant is paired to either a 6-speed manual or a new 6-speed ECT automatic transmission. When paired to a manual gearbox, the Land Cruiser can bring it up to 420 Nm of torque between 1,400 and 2,400 rpm.
Average fuel consumption and CO2 emissions are reduced by 9% for the 2015 Land Cruiser Diesel, with figures pointing 7.4 l/100 km (7.2 l/100 km for 3-door version) and 194 g/km (190 g/km for 3-door).
The new 2.8 D-4D engine incorporates a comprehensive range of measures designed to save weight, enhance combustion efficiency and reduce friction. A resin head cover has been adopted, and the thickness of the entire cylinder head has been reduced. The weight reduction contributes significantly to lowering energy consumption and, hence, improving fuel efficiency. Furthermore, it features an electronically controlled, common-rail type fuel injection system that achieves higher pressure and more advanced injection pressure control, and a new piston shape has been adopted to match the new shape of the combustion chamber. Precise pilot injection matching the state of the ambient air occurs before the main injection to shorten ignition delay, combining stable combustion in even the world’s harshest environments with quiet operation and high thermal efficiency.
In addition, the efficiency of the intake and exhaust ports and fuel injection system has been optimized for improved torque. Two intake ports are used in unison, according to the engine speed: a tangential port that produces a high swirl flow, agitating the air/fuel mixture to enhance combustion efficiency, and a helical port that achieves a high flow volume.
Lastly, the new turbocharger [paired to EGR (Exhaust Gas Recirculation)] is 30% smaller than its predecessor and features a newly-developed turbine and impeller; both attibute to better acceleration and higher torque on a wide rev range.