BMW 3-Series

Fundamentally unchanged – and still unchallenged by others – are the 3 Series’ essential attributes of rear-(or all-)wheel drive, harmonious front/rear weight balance, outstandingly precise steering and skillfully engineered suspension…all of which conspire to produce the uniquely satisfying driving experience that is quintessentially BMW. Thanks to the various facets of BMW EfficientDynamics – especially via the diesel-powered 335d Sedan – the 3 Series experience is more satisfying than ever before.

The 2011 BMW 328i Sedan and 335i Sedan start at $34,525 and $41,975, respectively, including $875 Destination & Handling. The 328i xDrive Sedan and 335i xDrive Sedan start at $36,525 and $43,975, respectively, including Destination & Handling. The 335d sedan featuring BMW Advanced Diesel technology starts at $45,025, including automatic transmission and $875 Destination & Handling.

All-new is the engine for the 335i Sedan. Internally designated the “N55,” this turbocharged, all-aluminum engine features essentially the same “short block” and 3.0-liter displacement of its predecessor, but benefits from five additional years worth of development and refinement. The result is an engine that is more responsive, more fuel efficient, and cleaner-running than its outstanding predecessor, but preserves the previous engine’s output and soul: 300 horsepower and 300 lb-ft of torque, and a 7,000 rpm redline. The 6-speed manual gearbox – beloved by North American enthusiast drivers - remains standard, and the well-known 6-speed Steptronic automatic is optional, now featuring “pull-style” shift paddles on the multifunction steering wheel.

BMW Advanced Diesel with BluePerformance: high-performance, high-efficiency twin-turbo diesel engine in the 335d Sedan. As an important element of BMW EfficientDynamics, the 335d Sedan represents a significant step forward in combining high performance with high fuel efficiency. The 3.0-liter, twin-turbocharged inline-6 diesel engine powering the 335d – its predecessor has been widely acclaimed in Europe – is completely new to the U.S. Also new is its BMW BluePerformance emission-control technology.

The 328i models are powered by a naturally aspirated (i.e., non-turbo) engine featuring advanced, weight-saving magnesium/aluminum construction – still unique among the world’s automobiles. Its Valvetronic system enhances efficiency by employing variable valve lift, rather than a throttle, to regulate engine power. This engine produces 230 hp, 200 lb-ft. of torque, and EPA highway mileage ratings as high as 28 mpg (depending on model and transmission) in 2008. It is a sterling example of BMW’s long-standing tradition of the smooth, sonically delightful “inline six” that delivers excellent performance.

BMW 3 Series Sedan customers have a choice of two inline-6 engines that are the worlds’ finest. The BMW 328i features 230 horsepower while the BMW 335i has 300 horsepower and is the first inline-6 equipped with a single twin-scroll turbocharger, BMW’s Valvetronic throttle-less intake technology, High Precision direct fuel injection, and all-aluminum construction.

The 335i’s new inline-6 engine displaces 3.0-liters and develops maximum output of 300 hp at 5,800 rpm, with peak torque of 300 lb-ft available all the way from 1,200–5,000 rpm. Redline is 7,000 rpm. This is the same level of performance as the previous 3.0-liter twin-turbo inline-6 but with the innovation of twin-scroll technology and the integration of Valvetronic, this new engine is even more fuel efficient.

Two recent developments caused BMW to reconsider turbocharging. While many luxury-performance carmakers began to achieve power gains by building engines of ever-increasing displacement, BMW looked for a more efficient way; smaller engines and turbocharging made sense. Also, the technology transfer from BMW’s turbocharged diesel engines could easily be transferred to their gasoline-fired counterparts. Accordingly, BMW articulated its new approach to developing high-performance engines as part of its EfficientDynamics initiative.

The significant loads and cylinder pressures of the N55 300-hp engine required the use of an aluminum engine structure with cast-iron cylinder sleeves. Altogether, the N55 weighs about 427 lbs. The 335i Sedan dual exhaust system runs at both sides of the vehicle. At low loads, a flap channels most gas through one side to reduce low-frequency exhaust "rumble." The 335i Sedan features an air-to-oil external oil cooler mounted in one wheel well as opposed to the N52's coolant-to-oil unit.

The peak power of 300 hp at 5800rpm has already been mentioned; this is fully 70 hp up on the 2011 328i models. At least as important is the fact that this engine can deliver its peak torque from 1200 rpm - not far above idling - to 5000 rpm. On the road, this power and torque result in outstanding performance. The 335i Sedan can accelerate from 0 - 60 mph in just 5.4 (5.6) seconds when equipped with the manual (automatic) transmission. The sense of urgency continues all the way to the electronically limited top speed of 130 mph (150 mph when equipped with the optional Sport Package). The 335i xDrive Sedan accelerates 0-60 mph in 5.3 (5.4) seconds when equipped with the manual (automatic) transmission.

Source: BMW press

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