More on the EPS used on the M3/M4

BMW M4 | January 14th, 2014 by 3
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BMW M was given the mission to make the electrically assisted steering M acceptable. BMWBLOG has written extensively on electrically assisted steering (EPS) and has …

More on the EPS used on the M3/M4
BMW M was given the mission to make the electrically assisted steering M acceptable. BMWBLOG has written extensively on electrically assisted steering (EPS) and has noted that BMW uses components for its implementation of EPS that promise the best possible feedback.
To insure the specific type of feedback that M drivers require, M engineers have stiffened the front end of the car, built specific components for their EPS implementation, and have reduced some of the functionality required for the wider driving audience of BMW’s other cars. Of course the software behind the M implementation is completely different than for the regular EPS.
More on the EPS used on the M3/M4

It stands to reason that BMW would work exceptionally hard to make the EPS right on the M3/M4, the M brand’s crown jewels.

  • Jan

    “reduced some of the functionality required for the wider driving audience of BMW’s other cars” I have no idea what this means.

    • Pepe

      What I understood from this statement is that, at least here in the US, a
      great majority of the BMWs sold are NOT bought by enthusiast but rather
      by image conscious people who would have picked a Benz or Audi and
      found a better deal on a BMW. In other words, they want the luxury part,
      name brand, and image of the car, not care much about performance.
      Therefore the steering wheel settings for this audience will be softer
      feeling (increased functionality to make it feel ‘easier’ to turn the
      wheel), meanwhile on a performance car you want it to be closer to what
      the suspension set up is, so a bit tighter feeling to emphasize the
      handling, which would require less effort by the system to move the
      components in comparison (aka, less functionality of the system needed
      -read it as less intervention of it-)

    • Hugo Becker

      There are a number of things EPS can do that a hydraulically assisted rack can’t do. One of which is to ‘simulate’ caster. Caster provides self-centering to steering and directional stability at speed. With EPS you can dial out physical caster and utilize the EPS to perform the centering functions. M dials in physical caster for directional stability at Autobahn speeds and therefore does not use that functionality of the EPS.

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