Toyota has enhanced the 3.0-liter D-4D diesel engine in its Land Cruiser full-size SUV for the European market to provide more power, while slightly reducing fuel consumption and improving the vehicle’s emissions profile. The company also announced an enhancement to the V6 gasoline engine Land Cruiser model that offers incrementally better fuel economy.
All models feature reduced noise and vibration levels, and all models in the Land Cruiser range are now fully Euro-4 compliant.
The 3.0 liter D-4D (designated 1KD) in the Land Cruiser now delivers up to 127 kW (173 hp) at 3,400 rpm—a 4% increase in power. The engine develops 410 Nm (302 lb-ft) of torque with a widening of the maximum torque band across 1,600 rpm to 2,800 rpm.
Despite the power increase, CO2 emissions from the 3.0 D-4D are reduced, according to Toyota, and the engine now complies with Euro-4 emissions standards. The prior model averages 9 liters/100km of fuel consumption (26 mpg US), with 243 g CO2/kilometer.
Technical improvements to the diesel engine include:
More precise control of the swirl control valve in the two separate inlet ducts. The swirl valve is positioned according to engine running conditions and now has a three-step setting to improve low-speed torque and reduce emissions.
A bypass to the Exhaust Gas Recirculation (EGR) cooler which results in lower emissions at cold start or in other cold running conditions.
A rotary solenoid throttle offers quicker throttle response, improving driving dynamics and giving more precise control of EGR.
Toyota recently took a 5.9% stake in Isuzu and the two companies will collaborate on light-duty diesel engine development. (Earlier post.)
Toyota delivered improved fuel consumption on the gasoline engine by fitting a flex lock-up system to the advanced automatic gearbox that is standard on the V6 gasoline Land Cruiser. The flex lock-up system allows increased lock-up clutch operation range by maintaining controlled slip.
Combined fuel consumption for the 5-door V6 is now down to 12.4 liters/100km (18.9 mpg US) and CO2 emissions are reduced to 291 g/km. The previous 4.0 V6 gasoline engine offers fuel consumption of 12.8 liters/100km (18.3 mpg US) with CO2 emissions of 305 g/km.