• Aug 5th 2009 at 4:26PM
  • 39
The next generation BMW 3-series is set to get some major revisions when it arrives in two year's time. The new model is expected to be the first in the range to get a line of turbocharged three-cylinder engines in both gas and diesel variants, and will likely be 1.5-liter units -- essentially halved versions of the latest generation inline-sixes.

BMW's current six-cylinder diesels use a sequential dual turbo setup with small and large blowers to provide quick response and better top-end power. The new engines may use an electric motor to spin up the turbo more quickly allowing the use of a single turbo for reduced weight and complexity.

Aerodynamics will also be a major focus of the new 3 with the expected inclusion of front wheel air curtains. Ducts in the lower front bumper will route air out just ahead of the front wheels, creating a virtual wheel skirt. The high velocity over the wheels will prevent air coming around the sides and spilling around the wheels, one of the major sources of drag.

Other areas of improvement will include weight reductions, the incorporation of hybrid drive technologies, low-power climate control systems and eight-speed automatic transmissions. All that and more could be in showrooms as early as 2012.

[Source: AutoCar]


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    • 1 Second Ago
  • 39 Comments
      • 6 Years Ago
      >>>BMW's current six-cylinder diesels use a sequential dual turbo setup

      Incorrect - they are twin turbo.
        • 6 Years Ago
        dual = twin
        • 6 Years Ago
        What the hell did you think dual meant?
        • 6 Years Ago
        I believe the diesel engines have sequential turbos: one small, one big. The gasoline engines have twin turbos: two small, same sized turbos.
        • 6 Years Ago
        Strider (sorry for the mispelling before),

        Yeah, the affect is so seamless its almost odd. Feels more like a turbine than a piston-powered vehicle.

        Sounds vaguely like one too since you hear the turbo-whine over the engine.
        • 6 Years Ago
        The word in question is Sequential which the BMW diesels are not. "Dual" turbo setups are either "Twin" (identical turbos) or "Sequential" (one small, one larger).

        Big difference when discussing lag solutions to it.


        • 6 Years Ago
        Snider,

        Except you are wrong about which the diesel uses.

        They do in fact use one small and one large. There is no lag.
        • 6 Years Ago
        I stand corrected - the Diesels (N57) are sequential (and variable geometry). Fancy!
      • 6 Years Ago
      BMW really rocks the car business industries which creates new exciting features about the latest trend in car.

      This seems very interesting!


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      • 6 Years Ago
      Should definitely be some interesting changes coming up. Can't wait to see them come to fruition.
      • 6 Years Ago
      You guys think this is going to be reliable? My 335 has had 2 fuel pumps replaced, granted they now have 100,000 mi warrantee, I dont think I could do another BMW twin screw setup again.
        • 6 Years Ago
        What do fuel pumps have to do with turbo being unreliable? Every car has a fuel pump.. turbo cars just have higher flowing fuel pumps typically..

        I'm still puzzled why BMW is even thinking about using a 3 cylinder motor. don't they have horrible vibrations? i mean a large 4 cylinder is bad enough as is.....
      • 6 Years Ago
      I spent 2 days in Frankfurt (4/09), and failed to see a single 3 series BMW. I guess that they are only bought by brand (label) conscious wannabes in the colonies and the rest of the world... In Germany hot hatches like the 1 series rule.
      • 6 Years Ago
      Dude, you aren't going to see a three-cylinder here in the United States. They wouldn't sell. Nobody is going to buy a BMW and admit it has a three-cylinder. It's sad, but true... most people in the United States have image problems. I personally wouldn't purchase a Bimmer unless it had the fabulous inline-six under the hood. Those inline-sixes make almost every V6 seem cheap. Ah, well... I'm sure BMW can pull it off just fine. Hopefully the handling makes up for it.
      • 6 Years Ago
      Ha ha... my '91 Geo Metro Convertible had a 3-banger!
        • 6 Years Ago
        How many fuel injectors did that have?
        • 6 Years Ago
        The answer is 1!
        • 6 Years Ago
        @MikeW: I dunno.
        • 6 Years Ago
        I know, really...but I thought it was so cool.
      • 6 Years Ago
      I am just about wetting my pants in excitement over seeing an I3 3 Series. This should get REALLY interesting....
      • 6 Years Ago
      Jeremy Clarckson's bad feeling of how we have reached the begining of the end when it comes to super cars is actually happening now to our beloved 3-series. Hybrid 3 cyl turbo complex and not what a 3 series should be.
        • 6 Years Ago
        actually, the customer gets a vote
        • 6 Years Ago
        BMW makes the 3 series, so BMW says what a 3 series should be.
      • 6 Years Ago
      It seems like a move in the right direction - squeezing the most out of a small light-weight engine, while reducing overall weight and improving overall aerodynamics. All are realistic achievable goals, unlike a certain other automaker that is banking everything on heavy, expensive batteries with blind faith the technology will improve and cost will come down.
      • 6 Years Ago
      3 cylinder engines? I'm scared, I used to love making fun of 3cyls for their prominence in ultra economy cars like the Geo Metro and the Smart, but now that's all going to change.
      • 6 Years Ago
      Oh, boy, the new 315i. Does not compute.
        • 6 Years Ago
        BMW no longer uses the engine size in the model number.
        - the current 328i uses a 3.0l engine
        - the current 335i uses a turbo 3.0l engine
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