Tonivillie的部落格

  New M3/M4 offical released...有興趣嗎? 請恰總代理

ENGINE

• 3.0L inline 6 cylinder engine (S55) with two mono-scroll turbochargers
  • 3,027 cc (compare to 2,979 cc of N55)
  • 89.6mm bore / 80mm stroke over-square (compare to 84mm bore / 89.6mm stroke under-square of N55)
  • Derived from N55 engine
  • Direct Injection
  • VALVETRONIC
  • Double-VANOS
  • closed-decked crankcase (4.4 lbs / 2kg lighter)
  • twin-wire arc-spray coating (instead of liners) in cylinder bores reduce engine weight
  • 20 lbs lighter than V8 S65 engine (from E90/E92 M3)
• 430 HP (approximately) from around 5000-7300 RPM
• "far beyond" 369+ LB-FT (500 Nm) from under 2000 RPM to over 5000 RPM
• See Dyno Chart
• Slightly above 7500 RPM redline

TURBOS

• Two 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 - more details)
• Impulse charging for optimized responsiveness
• Flow-enhanced manifolds
• Electric wastegate actuator

COOLING

• 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

WEIGHT

• Under 3,306 lb (1500kg) weight
  • this figure is without driver and with 90% fuel
  • BMW clarifies that "the new model is now around 80 kilograms [176 lbs] lighter than a comparably equipped predecessor model"
  • compare to E46 M3 at ~3,400 lb curb weight
  • compare to E92 M3 at ~3,600 lb curb weight
  • compare to C63 AMG at ~3,900 lb curb weight
  • compare to RS5 at ~4,000 lb curb weight
• ~ 7.68 lb/hp power to weight
  • compare to E92 M3 at 8.7
  • compare to C63 AMG at 8.7
  • compare to RS5 at 9.0
  • compare to E46 M3 at 10.25
• Fuel consumption and emissions reduction of 25%

CARBON FIBER CONSTRUCTION / BODY

• CFRP drive shaft (tested for speeds up to 205 MPH)
  • 40% weight savings over previous M3
  • increased stiffness
  • reduced rotating mass for better acceleration and throttle response
• CFRP roof for both M3 and M4
  • saves 11 pounds (5kg) on M3
  • saves more than 13.2 pounds (6kg) on M4
• CFRP roof bow
• Carbon fiber trunk for M4 (11 pounds (5kg) weight savings)
• CFRP front strut brace standard (weighs just 3.3 pounds (1.5 kg))
• Front fenders and hood made from aluminum

TRANSMISSION

• Standard 6 speed manual transmission
  • automatic throttle blips on downshift
  • more compact and quieter than predecessor E90/E92 M3 6 speed
  • 26.4 pounds (12kg) lighter
  • carbon fiber friction linings in synchroniser rings
  • dry sump lubrication
• Optional 7 speed M DCT (double clutch transmission) with launch control
• Active M Differential with constantly variable locking (a la M5/M6), from 0 to 100 percent
• Forged crankshaft

STEERING

• Entirely new electric power steering (EPS) unit, built by ZF
• Specially tuned for M3/M4
• Servotronic function electronically adjusts the level of steering assistance
• Three modes: Comfort, Sport, Sport+
• 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

SUSPENSION / CHASSIS

• Optional EDC Adaptive M suspension (with Comfort, Sport, Sport+ modes)
• CFRP front strut brace
• Double-joint spring strut front axle (saves 11 pounds)
• New five-link rear axle made from forged aluminum (saves 6.6 pounds)
• Aluminum suspension
• Aluminium stiffening plate
• Rear axle subframe fixed directly to body (bolted joints between the axle subframe and the body sills, without use of elastic rubber elements).

WHEELS / BRAKES

• 18 and 19 inch options will be available
• Lightweight forged wheels standard
• Staggered tire sizes - 255/35 ZR front and 275/35 ZR rear
• Prototypes fitted with Michelin Pilot Sport tires, but other tire brands will be certified as well
• M compound brakes standard (in blue)
  • four piston front / two piston rear
• M carbon ceramic brakes optional (in gold)
  • six piston front / four piston rear

EXHAUST

• Exhaust features electrically controlled flaps just before rear silencer to minimize exhaust back-pressure 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.
• Catalysts with metal substrate (less restrictive than ceramic)
• Exhaust always exits all four tail pipes

AERO

• 50:50 weight distribution
• Air Curtain
• M gills with integrated Air Breather behind front wheels

ACTIVE SOUND

• Live amplification of the S55 engine's natural sounds into the passenger cabin (via stereo speakers)
• No artificially generated sound or pre-recorded track being played

MISC

• The M3/M4 standalone components amounts to roughly 50 per cent. This includes body, chassis and powertrain components.
• Llithium-ion starter battery under consideration.
• M3 and M4 to be introduced together (at Detroit NAIAS 2014 in January).
• M3 and M4 developed with help of BMW race car drivers Bruno Spengler and Timo Glock's participation in extensive testing and set- up runs on the Nürburgring-Nordschleife circuit, focusing on assessment of the cars’ suspension, tyres and all elements of the powertrain.