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<< Prev Page 3 of 3  The new BMW 4 Series Coupe benefits from BMW's customary approach of splitting steering and drive forces between the front and rear axles, which is the ideal platform for balanced driving characteristics, directional stability and agile handling. It also has a 50:50 weight distribution, which sets it apart from its competitors. Taking into account its low center of gravity, unique chassis set-up and lightweight construction, the 4 Series Coupe is an exceptionally dynamic overall package which will satisfy every type of driver.The chassis construction of the new BMW 4 Series Coupe is based on that of the latest BMW 3 Series Sedan, although its springs and damping, axle kinematics and elastokinematics have all been tailored precisely to the engaging character of the new Coupe. The chassis engineers have managed to make further improvements to the agility and accuracy offered by the chassis, thanks to modification and fine-tuning of variables such as the camber angle, the track and the roll center. Particular attention was paid to strengthening the front section of the car help to further enhance steering precision and feedback. The front suspension of the new BMW 4 Series Coupe combines maximum stiffness with minimum weight. Aluminum torque struts, wishbones and swivel bearings bring a reduction in unsprung weight. At the same time, the engineers optimized the kinematics of the double-pivot suspension for agility and precision. Adjusting the position of the control arms in the swivel bearings from their arrangement on the latest BMW 3 Series Sedan gives the car a .7-inch (19-mm) lower roll center, which has a positive effect on driving performance. An additional strut between the front axle subframe and body sill creates a stiffer overall connection between the front wheels and the car's main structure, so the transverse forces generated on entry into corners are transferred to the car more directly. The BMW 4 Series Coupe responds more directly to the driver's steering commands and displays more sporty characteristics and greater agility. And that means it carves through corners with ease and precision. The rear axle of the new BMW 4 Series Coupe is a key component in its driving characteristics, but that does not mean comfort has been overlooked. This construction is based on the five-link concept, and its elastokinematics have been tuned specially for this sports coupe. In addition, extra-wide mounts and supports on the wheel carriers for track and camber, slightly repositioned pivot points, stiff control arms and suspension subframes, and the use of thrust arms to connect the suspension with the body all provide an excellent basis for an extremely sporty and dynamically exceptional overall set-up. The result is precise and assured wheel location, directional stability in any driving situation. Aerodynamic features around the rear suspension also contribute to driving precision. A standard feature of the new BMW 4 Series Coupe is the Servotronic system which provides speed-sensitive power assistance. The system's precise programming results in sharper steering feel, feedback, precision, accuracy and immediate response. The new BMW 4 Series Coupe can also be equipped with Variable Sport steering as part of the optional Dynamic Handling Package. This provides a somewhat "quicker" on-center steering ratio which then varies depending on the amount of steering "lock" (angle) applied by the driver. The result is even more-lively steering during the "turn-in" phase of cornering, and excellent stability mid-corner and on corner exit. The new BMW 4 Series Coupe comes equipped with powerful swing-caliper or fixed-caliper brakes and large, inner-vented brake discs. The calipers on the front brakes are made of aluminum. As well as low unsprung weight, the brakes also stand out with their high heat tolerance, excellent wet braking performance, ease of use and excellent feel. A brake pad wear indicator and the Brake Drying function are standard on all models. The new BMW 4 Series Coupe's lightweight construction makes a contribution to the car's performance qualities. The use of high- and ultra-high-strength multi-phase steels maximizes the body's strength, without driving up the weight. Components which are central to rigidity are made from micro-alloyed steels. The body's front end is 60 percent more rigid than that of the outgoing BMW 3 Series Coupe and so has benefits beyond agility and steering precision alone. Most impressively, the new BMW 4 Series Coupe tips the scales at up to 99 lb (45 kg) less than its predecessor, depending on the engine and equipment specified, despite having grown significantly in terms of dimensions. The new BMW 4 Series Coupe highlights its aerodynamic qualities with a Cd (drag coefficient) of 0.28. Changes to the front apron and the rear of the car have gotten the coupe aerodynamic lift qualities that match the figures of the current BMW M3 Coupe. Another factor here is the design of the underbody: the aerodynamically-optimized structure incorporates smooth panels extending to the sides, under the engine compartment shield and around the front section of the exhaust tunnel. Together, they seal the underbody to the wind. The aerodynamic fine-tuning process is incorporated in every area of the body. The BMW Air Curtains in the front apron reduce turbulence - and therefore drag - around the front wheels. The wheel arches and the air deflectors in front of them were also designed with aerodynamics in mind. The new Air Breathers positioned rearwards of the front wheel arches divert some of the air flowing through the wheel arches, thereby reducing air resistance. The M Sport suspension included is part of the Sport Line and M Sport. It works with a firmer spring/shock absorber set-up and stiffer anti-roll bars, and its kinematics/ elastokinematics (bushings and bearings) have also been tweaked to suit the new BMW 4 Series Coupe. The M Sport suspension also includes 18-inch or optional (435i only) 19-inch light-alloy wheels. Alternatively, customers can select a lowered (non-xDrive models) Adaptive suspension, included in the Dynamic Handling Package, which adjusts the electronic damper mapping to each road surface and driving situation. The driver can also use the Driving Experience Control switch to vary the basic suspension settings between comfort and sport, according to personal preference. For performance-minded customers, BMW offers the M Sport Brakes. The aluminum fixed calipers (four-piston at the front, two-piston at the rear) and large discs combine low weight with short stopping distances. The new BMW 4 Series Coupe also offers drivers the ability to change between sporty, eco or comfort settings, depending on mood or preference. Using the Driving Experience Control switch with ECO PRO mode on the center console, drivers can select between ECO PRO, COMFORT, Sport or Sport+ (most models). Each of these selections will activate different settings for the powertrain and suspension components. In Sport mode, throttle response is improved and the steering becomes more direct. If the automatic transmission is fitted, the gearshift points are also altered for sportier driving. Depending on the car's specification, different settings can be selected for the powertrain and chassis components. In Sport+ mode, the Dynamic Stability Control thresholds are raised and Dynamic Traction Control (DTC) is activated. The electronic limited-slip function for the rear differential can then provide better acceleration out of corners or sharp bends. Owning a coupe reflects a driver's passion for elegant lines, performance driving and high-class dynamics. The state-of-the-art powertrain technology under the skin of the new BMW 4 Series Coupe ensures it delivers an engaging driving experience that satisfies even the most demanding expectations. Longitudinally front-mounted, inline engines powering the rear wheels continue BMW's tradition in creating a drive concept that delivers great driving pleasure. Both engines available for the new BMW 4 Series Coupe use BMW TwinPower Turbo technology, which combines sporty performance characteristics with improved efficiency. Available from launch are an inline six-cylinder engine for the BMW 435i Coupe and a four-cylinder unit for the BMW 428i Coupe. These award-winning engines not only supply the BMW 4 Series Coupe with outstanding acceleration and elasticity, they also keep the cars weight down to improve driving dynamics and lower fuel consumption. The new BMW 435i Coupe gives full value to performance-minded drivers thanks to a refined high-revving inline-six engine with instant power delivery and great fuel efficiency. Equipped with High Precision Direct Injection and Valvetronic fully variable valve control, the 3.0-liter engine with aluminum crankcase develops maximum output of 300 hp between 5,800 and 6,000 rpm. Peak torque of 300 lb-ft is generated at 1,200 rpm and remains on tap up to 5,000 rpm. The multi-award winning six-cylinder engine allows the new BMW 435i Coupe to accelerate from 0-60 in just 5.3 seconds with the 6-speed manual transmission, and only 5 seconds with the 8-speed automatic, on the way to an electronically limited 250 km/h (155 mph) top speed, when equipped with performance tires. Smooth power delivery, available torque, high revs and low weight define the 2.0-liter four-cylinder turbocharged engine. BMW's engine technology package - including High Precision Direct Injection, twin-scroll turbocharging, Double-VANOS variable camshaft control and Valvetronic throttle-less intake technology - offers high performance potential combined with low fuel consumption and emissions. The cutting-edge four-cylinder engine of the new BMW 428i Coupe generates maximum output of 240 hp at 5,000 - 6,500 rpm and peak torque of 255 lb-ft, which the driver can access between 1,250 and 4,800 rpm. This allows the 428i to sprint from 0 to 60 in 5.7 seconds and has an electronically limited top speed of 250 km/h (155 mph), when equipped with summer performance tires. The engine gives a smooth power delivery from the moment it spins above idle to the upper regions of its engine speed range along an almost linear curve. The no-cost optional 6-speed manual transmission features easy gear changes, precise shift travel and optimum gear spacing for the new BMW 4 Series Coupe (not available for 428i xDrive). For spirited drivers, the interface where the power from the engine is relayed to the drivetrain is critical to maximizing the car's performance. The manual transmission uses its high shift quality to allow for powerful sprints and rapid, short bursts of speed, and also helps to reduce fuel consumption. The high-performance 8-speed automatic transmission - with its extra gears, quick gear changes and delightful shift comfort - is perfectly matched to the character of the new BMW 4 Series Coupe. With only small changes in rpm between gear ratios, the ideal gear is on hand in virtually any situation out on the road. Many technical features and internal efficiencies ensure powerful acceleration and short bursts of speed are possible with no additional fuel consumption over the manual transmission. The 8-speed automatic's intelligent control technology enables quick shift and reaction times and direct downshift capability. Drivers may also shift gears using paddles on the steering wheel. Drivers can choose between Normal and Sport transmission modes using the gear shift lever or the Driving Experience Control switch. As an alternative to rear-wheel drive, the BMW 435i Coupe and BMW 428i Coupe can also be specified with BMW xDrive intelligent all-wheel drive. As well as sharing all the traditional virtues of all-wheel-drive systems - such as increased traction, safety and the optimum transfer of engine power to the road - BMW xDrive can also reduce oversteer or understeer that may occur in cornering situations. In the process, it enhances agility and precision, e.g. when turning into corners or when accelerating strongly out of them. The new BMW 4 Series Coupe comes with the Auto Start Stop function. Another standard feature is Brake Energy Regeneration, which ensures that - as far as possible - power for the vehicle's electrical system is generated during braking and coasting. ECO PRO mode is effective in helping the BMW 4 Series Coupe driver maintain an efficient and economical driving style. As well as tweaking the accelerator's responses and the engine management system, ECO PRO also benefits from intelligent energy and climate management. The system gives the driver tips and ideas - relevant to the driving situation at hand - on how to reduce fuel consumption even further through adjustments in personal driving style. Average fuel consumption can be cut by up to 20 percent in ECO PRO mode, with a corresponding boost to the car's range on a tank of fuel. The new BMW 4 Series Coupe's ancillary components also play a role in the car's intelligent energy management. Examples include the on-demand coolant pump, the map-controlled oil pump and the Electric Power Steering system, which only consumes electricity when steering assistance is actually required. The special air conditioning compressor works on the same principle. As soon as the driver switches the air conditioning off, the belt drive to the compressor is disconnected to minimize power drain. The use of lightweight materials makes a significant contribution to efficiency and agility, and helps to give BMW cars their impressive dynamic capability. Weight savings can be found in every area of the development process. As well as the use of plastics and cutting-edge composite materials, the increased deployment of aluminum components in the engine and chassis construction has also reduced the weight of the corresponding assemblies. The results are impressive: although the new BMW 4 Series Coupe has grown in terms of dimensions, it's between 44 lb (20 kg) and 99 lb (45 kg) lighter than its predecessor. << Prev Page 3 of 3 |
| Article | Image gallery (24) | Specifications | User Comments (1) |
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