In May this year, BMW will launch a new spec of its X5 and X6 diesel SUV range. Called the xDrive40d, it will extract 340 hp (254 kW) along with 700 Nm (516 lb-ft) from its inline-six dual-turbo.
This represents a marked improvement over the previous generation’s 313 hp (233 kW) and 630 Nm (465 kW) of torque. A 48-volt engine starter will linked to a compact-sized traction battery and power converter will deliver 11 hp (8 kW) and heaps of torque on its own when needed – in particular, when accelerating or coasting. Fuel efficiency should also improve.
The new xDrive40d will sprint 0-100 km/h (0-62 mph) in 5.5 seconds, which puts it between the xDrive30d (265 hp, 6.5 s) and the M50d (400 hp, 5.2 s).
Combined-cycle fuel consumption for the X5 xDrive40d will amount to 5.9 – 6.4 liters of diesel per 100 kilometers, which roughly corresponds to 44-48 miles per gallon in Great Britain and 36.7 – 40 MPG in the United States. The Х6 xDrive40d is marginally more economical with 5.8 – 6.2 l/100km (UK: 45.5 – 48.7 MPG; USA: 38 – 40.5 MPG). The xDrive30d is not nearly as economical.
The dual turbochargers boast variable geometry in their newest implementation, direct injection pressure amounts to impressive 2,700 bar, and the injectors have in-built pressure sensors for precise injection control. Exhaust treatment procedure fully complies with the Euro 6d.
This summer, BMW is also planning to discontinue the high-end diesel engine line used in the M50d over prohibitive production costs.