2015 BMW M3 and M4 Technology Takeaways

BMW M4 | December 11th, 2013 by 3
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With the demise of the naturally aspirated V8 of the outgoing M3, the world of M is exclusively powered through forced induction. And that’s not …

With the demise of the naturally aspirated V8 of the outgoing M3, the world of M is exclusively powered through forced induction. And that’s not all bad. When the new 2015 BMW M3 and M4 will deliver more power (and substantially more torque) from a 3.0 liter inline-six cylinder and also deliver a 25% improvement in fuel economy the engineers at M must be doing something right.

So what do we know about the latest M cars?

Here are some key facts:

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  •  the 3.0 L inline 6 produces 431 HP between 5390 to 7000 RPM, it also makes 406 lb-ft of torque from almost off idle, it will be the proverbial freight train
  • the weight saving schemes result in about 175 fewer pounds on the new M3/4 than the outgoing M3
  • the cooling systems are substantially beefed-up for effectiveness on the track
  • 0-100 km/H in 4.1 seconds (7 speed DCT), that will translate to a sub 4 second 0-60 MPH time undoubtedly (and, as always, BMW rates conservatively)
  • significant aero details, the interesting quote from Albert Biermann, “The way in which we channel the inflowing air through the engine oil cooler creates a Venturi effect, which reduces front axle lift and, in so doing, improves the steering.” Read as, reduces understeer.
  • the third generation 7 speed DCT gearbox should be the choice for track day enthusiasts and anyone regularly computing; it also has launch control and a new function described as ‘Smokey Burnout’ – that’s really what they’re calling it – which allows for rear wheelspin at low speeds
  • the 6 speed manual gearbox includes ‘throttle blip’ functionality during downshifts, automated rev-matching
  • the output of the transmission routes to the active M differential through a CFRP propshaft; this eliminates the need for a multi-piece propshaft and a center bearing, it also significantly reduces weight and inertia
  • the active M differential is incorporated into the Dynamic Stability Control programming and utilizes a multi-plate clutch setup to transfer torque
  • the standard wheels are forged 18” units, 9J fronts, 10J rears with 255 wide front rubber and 275 wide rear
  • let the wailing and gnashing of teeth begin, the M3/4 will have electrically assisted power steering (see this BMWBLOG entry for details), there is an interesting quote from Bruno Spengler regarding the steering, however; Spengler says, “The electronic power steering is very precise, and from my point of view as a race driver that’s very, very important. It responds instantly to inputs and provides excellent feedback.”; we’ll know more when we have an opportunity to drive one

3 responses to “2015 BMW M3 and M4 Technology Takeaways”

  1. Roland Renno says:

    The “throttle blip” is one of the most amazing services while driving a BMW sports car.

    • Hugo Becker says:

      Well – I’m not a big fan of it personally, I have managed to do that for myself all these years (about 40 years of driving manual transmissions), so, for me, I may have to unlearn something. FWIW, the Nissan 370Z has had this feature for a few years already also.

      • Roland Renno says:

        Yes we can do it manually, I did that too for years but it’s much more precise when the ECU does it for you.
        Besides the Nissan 370Z, the 2001 BMW M3 with SMG II had it way before any other company did it.

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