Кабриолет BMW M4 F83 будет рассекречен 4 апреля

[vlazarov]

Ссылаясь на собственные источники, интернет-портал Autoevolution сообщает о том, что 4 апреля 2014 года баварский автопроизводитель обнародует информацию о новом поколении открытого «заряженного» купе BMW М4 F83, публичная презентация которого состоится двумя неделями позднее - на Нью-Йоркском моторшоу.
Согласно предварительной информации, новинка будет оснащена таким же жёстким складным верхом, как и обычный кабриолет 4-Серии. Складывание крыши сможет осуществляться на скорости до 18 км/ч и будет занимать 20 секунд.
Под капот автомобиля будет установлена 3-литровая 431-сильная (550 Нм) «шестерка» с двумя турбинами, в паре с которой сможет работать семидиапазонный преселектив или шестиступенчатая механическая КПП. В первом случае автомобиль будет набирать «сотню» за 4,3 секунды, а во втором – на 0,2 секунды медленнее. Что же касается его максимальной скорости, то её ограничат на 250 км/ч.

[Tyler]

Еще немного информации - технические характеристики BMW M4 F83:

Двигатель

• 3-литровый рядный 6-цилиндровый Twin Turbo (S55)
• 2,979 - объем
• Stroke/Bore: 89.6mm / 84.0mm
• 425 сил - при 5500-7300 об/мин
• 406 LB-FT момент при 1850-5500 об/мин
• 0-100 км/ч за 4.2 секунды (DCT) / 4.4 секунды (РКПП)
• Ограничитель на 7600 об/мин
• 10.2:1 compression ratio
• Максимальная скорость 250 KMH
• Потребление топлива на 25% ниже, чем у предшественника E90/E92 M3
• На 10 кг. легче, чем предыдущий мотор S65 V8
• Две турбины
  • Mitsubishi mono-scroll turbochargers
  • 18.1 PSI / 1.25 BAR max peak
  • Pre-tensioned in Sport and Sport+ modes (keep spinning at a high rate of speed even after throttle lift-off, for ultra quick response)
  • Impulse charging for optimized responsiveness
  • Flow-enhanced manifolds
  • Electric wastegate actuator
• Direct Injection, Valvetronic variable valve timing and Double-VANOS continuously variable camshaft timing
• Closed-deck crankcase design (4.4 lbs / 2kg lighter)
• Twin-wire arc-sprayed coating used instead of liners (saves weight)
• Forged, torsionally rigid crankshaft (3kg / 6.6 lbs) lighter than typical BMW inline 6 engine)
• Track-specification cooling system
  • Air intake system features an indirect intercooler
  • Water cooler repositioned to the side for the high- and low-temperature water circuits, and the engine and transmission oil (if the M Double Clutch Transmission is specified)
  • Additional electric coolant pump cools the turbocharger bearing mounts when the car is stationary
  • Low-weight magnesium oil sump features special cover to limit movement of the oil under the effects of strong dynamic lateral acceleration
  • Under extreme longitudinal acceleration and deceleration, an oil extraction pump and a sophisticated oil return system situated close to the turbocharger help to maintain stable oil circulation
  • Double-flow oil recirculation pumps
  • Turbocharger suction system
  • Main radiator plus additional radiators for the high- and low-temperature circuits, turbocharger and transmission
  • Large indirect intercooler (sits atop engine, necessitating hood bulge)
  • Low-weight magnesium oil sump (2.2 lbs / 1kg lighter)
  • Temperature-stabilizing electric water pump
• Electronically control Exhaust
  • Electrically controlled flaps just before the rear silencer minimize exhaust back-pressure and produce a BMW M sound, as well as giving precise feedback on engine load
  • When closed, flow is forced into and laterally across the silencer; when open, flow is more directly through the narrow part of the silencer
  • Different selectable drive modes feature different engine sound profiles
  • Catalysts with metal substrate (less restrictive than ceramic)
  • Exhaust always exits all four tail pipes

Коробка передач - 2 варианта:

• 7 скоростная M Double Clutch Transmission (M-DCT) с Drivelogic
  • Third generation M-DCT
  • Функция Launch Control
  • Stability Clutch Control opens clutch when car is understeering to bring it back into line
  • Drivelogic modes can be selected for more comfortable, economy focused or sportier characteristics
• 6 скоростная МКПП
  • Robust double-plate clutch
  • More compact and quieter than predecessor
  • 26.4 pounds (12kg) lighter than predecessor
  • New carbon friction linings in synchronizer rings increases shift comfort
  • Dry sump lubrication
  • Automatic throttle blip downshifts (rev matching is disabled in Sport+ mode; active in Sport and Comfort modes)

Active M Differential

• Hollow lightweight output shafts
• Electronically controlled multi-plate limited slip differential (LSD)
• Control unit links up with the DSC (Dynamic Stability Control) system and also takes into account the position of the accelerator pedal, the rotational speed of the wheels and the car’s yaw rate
• 0% - 100% degree of lock
• M Dynamic Mode allows greater wheel slip, but with the safety net of DSC

CFRP drive shaft

• feeds engine's torque from gearbox to rear differential
• increased stiffness
• reduced rotating mass for better acceleration and throttle response
• single-piece unit with no center bearing
• на 40% легче системы-предшественника
• tested for speeds up to 205 MPH

Рулевое управление

• Entirely new electric power steering (EPS) unit - новая система, разработанная ZF
• Servotronic function electronically adjusts the level of steering assistance according to the car's speed
• 3 режима: Comfort, Sport, Sport+ (standard option)
• Specially tuned for M3/M4
• Will not compensate for understeer, oversteer, coarse road surface. Motor will not help unwind the steering wheel and it will self-center by by natural forces

Подвеска / Колеса / Тормоза

• Optional EDC Adaptive M Suspension features 3 modes: Comfort, Sport, Sport+
• Double-joint spring strut front axle
  • Lightweight aluminum construction for components such as control arms, wheel carriers and axle subframes saves 11 pounds (5kg) over a conventional steel design
  • Play-free ball joints and elastomeric bearings developed specially for the M3/M4 ensure an optimum and direct transfer of forces both laterally and longitudinally
  • Aluminum stiffening plate
  • CFRP front strut brace
• Five-link rear axle
  • Forged aluminum construction for control arms and wheel carriers - reducing unspring mass of wheel-locating components by around 6.6 pounds (3 kg)
  • Rear axle subframe bolted directly to body structure (bolted joints between the axle subframe and the body sills, without use of elastic rubber elements)
• Tires incorporated into construction process for the axles
  • low-weight 18-inch forged wheels (front axle: 9 J x 18, rear axle: 10 J x 18) with mixed-size tires (front axle: 255 mm, rear axle: 275 mm).
  • 19-inch wheels and tires are available as an option (in Ferric Grey or Black)
• BMW M compound brakes standard (in blue)
  • four piston front / two piston rear
• BMW M carbon ceramic brakes optional (in gold)
  • six piston front / four piston rear
  • 6-7kg (13.2lbs - 15.4lbs) lighter overall than standard brakes

Конструктивные особенности

• Curb weight of 4,005 pounds, на 90 pounds легче предшественника (согласно американскому пресс-релизу)
• CFRP drive shaft saves 40% weight
• CFRP strut brace (weighs 3.3 pounds / 1.5 kg) offers more rigidity than aluminum counterpart
• Алюминиевые передние крылья и капот

Другое

• Three-temperature neck warmers in seats
• Folding hardtop reduces wind noise by up to 2dB compared to predecessor model
• Hardtop folds in 20 seconds and can be lowered up to 11 mph (18 kmb)
• Windblock screen is smaller and lighter than predecessor and can be removed and stored behind rear seat
• Объем багажника 370 литров, что на 20 литров больше предшественника
• Electric loading assistance system in trunk to ensure maximum utilization of trunk space

[Tyler]

Сравнение BMW F83 M4 и E93 M3.


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