The engine: new benchmark in efficiency and dynamism.
BMW X models offer their own distinctive interpretation of typical BMW
driving pleasure. The BMW X1 xDrive28i combines this special driving
experience with efficiency that is unrivalled in this power class. As a
result, this new BMW X1 model offers sporty power delivery of a kind
that was previouslyconfined to six-cylinder engines ? but combines it
with outstanding fuel consumption and emissions performance.
It's all down to the latest-generation 2.0-litre four-cylinder petrol
engine, which sets new standards with its various innovative
technologies. The BMW X1 xDrive28i's powerplant achieves the twofold
goal of BMW EfficientDynamics in impressive style: it continuously
raises the bar on driving pleasure, while at the same time reducing fuel
consumption and emissions.
With a displacement of 1,997 cc and world-exclusive BMW TwinPower Turbo
technology, incorporating twin-scroll turbocharging, High Precision
Injection,
double-VANOS and VALVETRONIC, it delivers maximum power of 180 kW/245 hp at 5,000 rpm ? 55 kW more than the previous top-powered
BMW 2.0-litre petrol engine.
Debut: first application of BMW TwinPower Turbo in a four-cylinder engine.
BMW TwinPower Turbo technology gives the new four-cylinder enginethe
sort of power which naturally aspirated engines can only achieve through
more cylinders and substantially larger displacement. The four-cylinder
engine with its all-aluminium crankcase, including a motor sport-derived
bedplate, is
lighter and more compact than a six-cylinder engine of equivalent power.
This has direct benefits for the efficiency of the BMW X1 xDrive28i and
also,
thanks to the reduced front axle load, for agility.
The new engine offers more torque, too, than the previous naturally
aspirated engines. Rated torque of 350 Newton metres, which comes on
stream at just
1,250 rpm, ensures very good low-end response. The vigorous power
delivery, from only slightly above idling, is a very seductive feature
of this new engine,
and the power climbs steadily all the way to the upper area of the load
range. The new BMW X1 xDrive28i has a 0 to 100 km/h (62 mph) sprint time
of
6.1 seconds (6.5 seconds with automatic transmission). These times are
an improvement of 0.7 seconds and 0.3 seconds respectively on those for
the
previous model with six-speed automatic transmission. The new BMW X1 xDrive28i hits a top speed of 240 km/h (149 mph).
The turbocharger is a twin-scroll system. The exhaust streams leaving
the two pairs of cylinders are kept completely separate as they flow
through the
exhaust manifold and the turbocharger, taking a spiral path to the
turbine wheel. This configuration results in very low exhaust back
pressure at low
engine rpm, and allows the energy of the exhaust gas pulses to be
optimally managed and translated into powerful rotation of the turbine
blades, without a
response delay. The result is instant throttle reaction and typical BMW fastrevving performance.
More dynamic performance plus reduced emissions, thanks to VALVETRONIC, double-VANOS and direct injection.
The fully cylinder head-integrated VALVETRONIC variable valve control
system, and the double-VANOS variable intake and exhaust camshaft
timing, have a further positive impact on power development. The BMW X1
xDrive28i engine features assembled intake and exhaust camshafts and a
latestgeneration VALVETRONIC system which is even faster-acting thanks
to an
optimised stepper motor with integrated sensor.
The patented BMW VALVETRONIC system with seamlessly variable intake
valve lift control dispenses with the throttle valve system typical of
earlier engine generations. Instead, combustion air mass is controlled
inside the engine, resulting in much faster response. Pumping losses are
kept to a minimum, so making the engine more efficient.
The new engine's unusually high efficiency, for a turbocharged unit, is
also down to the High Precision Injection petrol direct-injection
system. Centrally positioned between the valves, solenoid injectors with
a maximum injection pressure of 200 bar precisely control the supply of
fuel. The fuel is injected very close to the spark plug, resulting in
clean and homogeneous combustion. The cooling effect of the injected
fuel also results in a higher compression ratio than on turbocharged
naturally aspirated engines. This results in further efficiency
improvements.
The efficiency theme continues with a computer-controlled oil pump and
an on-demand electric coolant pump. Also, the new BMW X1 xDrive28i is
specified as standard with a six-speed manual transmission with Auto
Start- Stop function. This system automatically switches off the engine
when the vehicle stops at crossroads or is sitting in stationary traffic
in order to prevent unnecessary idling and wasteful use of fuel.
The new engine technology and extensive, standard-fitted BMW
EfficientDynamics features achieve an exceptionally good balance between
performance and fuel consumption. The new BMW X1 xDrive28i has average
fuel consumption in the EU test cycle of 7.9 litres /100 km (35.7 mpg
imp), a 16 per cent improvement on the previous model. CO2 emissions are
rated at 183 grams per km.
