The BMW has a special performance version, limited edition, the BMW 3 Series sedan, the BMW 320si.
Equipped with the M Sports Package and 18-inch wheels with the same version of the design competition, this model has a special propeller 2 liter four-cylinder at high regimes that develops a maximum power of 127 kW/173 hp at 7000 rpm. This power provides a maximum speed of 225 km / h and acceleration from 0 to 100 km / h in just 8.1 seconds.
In addition to a sports suspension layout, the M Sports Package, standard on this special model includes the aerodynamic package BMW with modified bumpers and skirts, sports seats, M leather steering wheel, M footrest, fog and interior aluminum.
The rims 216, characterized by a radial pattern, 8-inch wide front and 8.5 inches behind, put on display the BMW Motorsport logo, the same cars participating in the FIA WTCC.
In addition to the six colors are generally available on the 3 Series sedan with the M Sports Package, the BMW 320si is also available in a black metallic carbon exclusive.
The heart of this model only in a limited edition is the propeller of a four-cylinder 2-liter of displacement that develops a maximum power of 127 kW/173 hp at 7000 rpm. And a maximum torque of 200 Nm at 4250 rpm.
Compared to the model series, the bore is increased by one inch to 85 mm, while the race was reduced by 2 mm to 88 mm. Instead of inside the cast iron cylinders, the pistons slide coatings on aluminum alloy inside the engine block. Other brands on the engine the rods are more rigid structure and a reinforced basement.
In creating this propeller, specialists in the development of the BMW engines have intentionally decided not to use the system VALVETRONIC. They have instead opted for a conventional operation of the valves with two camshafts in the head, arms and four valves per cylinder. Unless doing so many moving parts, the movement of the valves ensures a high level of rigidity and precision, even with the highest regimes - in the model is limited edition and in race cars.
The cylinder head represents an entirely new development, with the rough castings from the foundry of Formula 1 of the BMW plant in Landshut. Valves and pipes for intake and exhaust plus ensure optimal training of air / fuel mixture. Finally, special spark plugs, run by the individual reels, initiate the combustion process.
The high compression ratio from 10.5 to 11,0:1 helps increase the power of 17 kW/23 hp compared to the normal model, while the engine always uses super unleaded petrol at 95 octane, just like the version " standard ".
The technology of Formula 1 can be found and admired in other engine components such as rocker arms coated in a special process developed specifically for the BMW engines of Formula 1.
The four-cylinder mounted on the new special model reaches its maximum output of 127 kW/173 hp at 7000 rpm with arrangements limited to 7300 rpm. Thanks to the intake system with intake manifold (DISA) a variable length and variable adjustment of the camshafts, torque is raised to a maximum of 200 Nm at 4250 rpm.
To take account of the high temperatures typical of motor sport, specialists of the BMW engines have focused in particular on the movement of the liquid cooling, enhanced by large sections in the cylinder head. The radiator in the six-cylinder models, in turn, ensures a good balance of temperatures at all times.
The lid of the cylinder head made of special carbon fibers, reducing the weight of about 10 kg compared to the BMW 320i. Putting on display its qualities already at first glance, the cover of the cylinder head not only shows a direct connection with motor sport, but also lowers the center of gravity of the engine by reducing the weight at the top.
The propellers are largely hand-built by specialists in the establishment of the engines of BMW Hams Hall, from where they are shipped directly in the assembly plant of BMW Monaco. BMW 320si is available only in Europe, driving is on the left and right.
The manual six-speed BMW 320si is reported so as to enable the BMW 320si to reach the maximum speed of 225 km / h in sixth gear. With weight of 1,350 kg (DIN), this sports sedan performance accelerates from 0 to 100 km / h in just 8.1 seconds. The recovery from 80 to 120 km / h in fourth gear, in turn, requires not more than 7.7 seconds. Finally, it's almost understood that the BMW 320si meet all Euro 4 anti-pollution regulations on emissions and consumes just 8.9 litres/100 km in combined.
Thanks to its design, the new Edition allows the driver to enjoy the best of motor sport: the four-cylinder responds immediately to the accelerator pedal, providing even greater un'agilità and a more dynamic response than the 320th. The engine emits a powerful sound and sporty, without becoming tiresome, responding dynamically to the gas pedal and immediately giving the driver the power and performance you need.
The sporty and ambitious drivers also appreciate the fact that the engine develops a braking effect even more pronounced when you release the pedal than a propeller with the system VALVETRONIC. This is because the management load of the engine is controlled in this case by a conventional throttle.
Together to march short (4:10) and M sport suspension with 18-inch wheels and wide tires in front and even wider rear, the BMW 320si allows a style of leadership very sporty and dynamic, not too close to the extreme limits . Thanks to its balanced distribution of the masses on the axles, this exclusive sports saloon also excels for its neutral behavior and its superior agility on the road, which explains how an experienced pilot at the wheel of the BMW 320si will be able to take a tour of the legendary north of the Nürburgring circuit in under 9 minutes.
To accommodate a more powerful engine, the BMW 320si features a braking system increased and more powerful: the 16-inch discs ventilated, pre-and post, ensure optimum deceleration at all times. This very special car is also fitted with circles of generous dimensions.