BMW M3, M4 first tech details – 430 hp, over 500 Nm!


We have the first technical details of the new BMW M3 sedan and M4 coupe ahead of their Detroit show debut in January – both will be powered by a 3.0 litre S55B30 twin-turbo straight-six that develops around 430 hp at 7,300 rpm and more than 500 Nm of torque from 1,800 to 5,200 rpm, bettering the outgoing V8-powered M3’s figures by over 30%.

Being smaller than the previous naturally-aspirated V8, the engine can be placed further back in the bay. BMWBlog points out that as the TwinPower Turbo assembly is mounted at the bottom and rearward of the motor, mated to the exhaust manifold, the recirculating exhaust gases have a very short distance to travel before they are sucked into the turbocharger.

The engine is mated to either a ZF six-speed manual or an optional seven-speed M DCT with DriveLogic and launch control. The manual ‘box is 12 kg lighter than its Getrag predecessor and auto-blips on downshifts – like Nissan’s Synchro Rev Match. The Active M diff is now electrically-actuated, constantly varying the locking effect. Of course, M Dynamic Mode is present as well.

Boasting direct injection, Valvetronic and Double Vanos tech, the EU6-compliant motor can rev up to 7,500 rpm. It features a closed-deck crankcase design, allowing increased rigidity and cylinder pressures. The cylinder bores feature a twin-wire arc-sprayed coating instead of liners, saving weight. The prop shaft is made out of CFRP – the material’s high rigidity and low weight allow the shaft to be produced as a single piece without a centre bearing.

BMW M3 and M4

A forged, torsionally-rigid crankshaft provides increased torque-carrying capacity, and its reduced rotating masses improve throttle response and acceleration. Fuel consumption and emissions are down by about 25%, while the vehicles themselves weigh under 1,500 kg – in the case of the M4, an 80 kg reduction over its M3 coupe predecessor. Weight distribution for both cars are virtually 50:50.

Keeping things cool, apart from the main radiator, are radiators for the high- and low-temperature circuits, turbocharger and gearbox, plus a temperature-stabilising electric water pump and an indirect intercooler, mounted on top of the engine to ensure the air going in stays as cool as possible.

Under strong lateral acceleration, a magnesium oil sump with a special cover limits oil movement, while an oil extraction pump and a sophisticated oil return system ensure circulation is uninterrupted. Electrically-controlled flaps in the twin tailpipes provide the soundtrack, while minimising back pressure and giving feedback on engine load.

Suspension is handled by a double-joint spring strut front axle and a five-link rear axle. The control arms, wheel carriers and axle subframes are made out of aluminium, while an aluminium stiffening plate, CFRP front strut brace (weighing only 1.5 kg) and extra bolted joints between the axle subframe and body sills all help to increase rigidity.

BMW M3 and M4

The electromechanical steering and optional Adaptive M suspension both offer Comfort, Sport and Sport+ settings. M compound brakes are standard; for even greater stopping power, carbon ceramic brakes are available as an option.

Large front air intakes, exposed CFRP components and the rear diffuser are as much about function as form. Reducing lift are the front apron, smooth underbody and ‘Gurney’ rear spoiler lip (integrated spoiler lip on the M4), while the Air Curtain and M gills with Air Breather minimise front wheel arch turbulence.

Along with those already mentioned, CFRP is used in the roof (for both sedan and coupe this time, yielding savings of 5 kg and more than 6 kg respectively), front and rear fascias, and boot liner. BMW works drivers Bruno Spengler and Timo Glock have extensively tested the BMW M3 and M4 on the Nurburgring.

Spengler had this to say: “The suspension has a very sporty set-up, the feedback from the front axle is extremely direct and the grip at the rear axle is phenomenal. The power is right there, even at low rpm, and you can sense that you’ll be able to access the output and torque over an extremely wide rev band.” Verily, we’re salivating.

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Jonathan James Tan

While most dream of the future, Jonathan Tan dreams of the past, although he's never been there. Fantasises much too often about cruising down Treacher Road (Jalan Sultan Ismail) in a Triumph Stag that actually works, and hopes this stint here will snap him back to present reality.



  • Alpha on Sep 25, 2013 at 2:12 pm

    Wow!!! Awesome machine !!!

    Like or Dislike: Thumb up 30 Thumb down 1
  • Straight-six and good-ol manual box in a FR layout coupe, That’s what dreams are made of. Thou most likely 2% of all M3/4 sold will be in techy DCT, nevertheless, light enough and it will truly be an ultimate driving machine(E92 are rather heavy for a M3)

    Like or Dislike: Thumb up 22 Thumb down 1
  • drrif on Sep 25, 2013 at 2:22 pm

    Undisputed ultimate driving machine.

    Like or Dislike: Thumb up 20 Thumb down 1
  • fredo on Sep 25, 2013 at 3:09 pm

    i think it could use a little more power than just 430hp… perhaps closer to 500hp

    Like or Dislike: Thumb up 10 Thumb down 2
  • drBirdie on Sep 25, 2013 at 3:13 pm

    why so many rusty spots on the exhaust system??

    Like or Dislike: Thumb up 2 Thumb down 10
  • sudonano on Sep 25, 2013 at 3:35 pm

    This is the reason that M is the most powerful alphabet. 30% more torque AND 25% less consumption? that is like for every 1.*% torque gained, you save 1% of fuel!

    AND is better. In this case.

    Like or Dislike: Thumb up 15 Thumb down 1
  • Fahmi on Sep 25, 2013 at 5:55 pm

    Yes, only 30hp increase, but 100nm more torque at wider rpm band plus lighter weight, it is attractive indeed…

    Like or Dislike: Thumb up 8 Thumb down 1
  • Really impressive technology, a straight-six engine actually mounted at ‘half V’ position in the vehicle.

    Like or Dislike: Thumb up 0 Thumb down 3
  • erwinkarim on Sep 25, 2013 at 9:50 pm

    your slides are in german, bimmerpost has them in english

    Like or Dislike: Thumb up 1 Thumb down 0
    • erwinkarim on Sep 25, 2013 at 9:51 pm

      ops, it’s at

      Like or Dislike: Thumb up 0 Thumb down 0
  • It’s refreshing that BMW is still offering a good old manual ‘box when most sports cars is now only offered with two pedals. M division usually underrate their output claims, so expect the engine to produce more power and torque in the real world.

    Like or Dislike: Thumb up 2 Thumb down 0
    • Kelvin Lew on Sep 26, 2013 at 12:05 am

      Europeans still prefer the manual. I don’t think BMW will change that anytime soon.

      I agree, M division output figures at wheel.

      Like or Dislike: Thumb up 1 Thumb down 0
  • Kelvin Lew on Sep 26, 2013 at 12:01 am

    I have goosebumps already. Everyone should drive this.

    Like or Dislike: Thumb up 0 Thumb down 0
  • TheVolvoGuy123 on Sep 26, 2013 at 12:39 am

    Not bad . I love it .

    Like or Dislike: Thumb up 0 Thumb down 0
  • TheVolvoGuy123 on Sep 26, 2013 at 12:42 am

    Just got an idea. Why not make a M i8 . Just thinking

    Like or Dislike: Thumb up 0 Thumb down 1
  • _xXx_ on Dec 18, 2013 at 8:54 pm

    hope the chinese can’t copy it else I’d be fully blinded by stupid myvai drivers…

    Like or Dislike: Thumb up 0 Thumb down 0

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