Ufficiale: BMW Concept M4 Coupè (Prj. F82)

ENGINE

• Inline 6 cylinder engine with two mono-scroll turbochargers
  
  Direct Injection
  
• VALVETRONIC
  
• Double-VANOS
  
• closed-decked crankcase
  
• twin-wire arc-spray coating (instead of liners) in cylinder bores reduce engine weight
  

 


[*]430 HP (approximately)


[*]"far beyond" 369+ LB-FT (500 Nm)


[*]See Dyno Chart


[*]Higher than 7500 RPM redline





 


TURBOS

• Two mono-scroll turbochargers
  
• 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
  
• Low-weight magnesium oil sump
  
• 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 lighter than a comparably equipped predecessor model" [80kg = 176 lbs]
  

 

• 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

• CFRP drive shaft
  
  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))





 


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)


[*]Forged crankshaft





 


STEERING

• Electric power steering specially tuned for M3/M4
  
• Servotronic function electronically adjusts the level of steering assistance
  
• Three modes: Comfort, Sport, Sport+
  

 


SUSPENSION / CHASSIS

• Optional 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

• Lightweight forged wheels standard
  
• Staggered tire sizes
  
• M compound brakes standard (in blue)
  
• M carbon ceramic brakes optional (in gold)
  

 


EXHAUST

• Exhaust features electrically controlled flaps just before rear silencer to minimize exhaust back-pressure as well as giving precise feedback on engine load.
  

 


AERO

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

 


MISC

• 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.