Official BMW M3 M4 Specs

BMW reveals M3 and M4 technical specifications. Under the hood they feature a 3.0L inline 6 cylinder engine with two mono-scroll turbochargers.

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
  • 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
  • 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


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.



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