The new BMW turbo 6, the SINGLE turbo N55

Discussion in 'OT Driven' started by Mitchj, Nov 13, 2009.

  1. Mitchj

    Mitchj OT Supporter

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    [​IMG]

    Details on BMW's new N55 engine have been out since last summer, but we haven't discussed them much here beyond telling you that it's the best of the 3 engines (2 for us) that BMW will offer in the 2010 BMW 5 Series GT. But this isn't just a turbocharged inline-6 the company has made specially for misshapen crossovers. Rather, this engine will replace the current twin-turbocharged inline-6 we know as the N54.

    The N55 shares its all-aluminum block, direct injection system and 10.2:1 compression ration with the N54. And the weight difference between the two is little more than 4 pounds. But the new engine differs in two key ways:

    --> It has a single, twin-scroll turbocharger (which BMW calls "Twin Power") instead of two smaller turbochargers.

    --> It is the first BMW inline-6 to use Valvetronic (er, make that the 2nd, as the N52 engine, seen in the 2006 330i, had it first), whereby an electric motor built into the cylinder head continuously varies the amount of valve lift.

    The addition of Valvetronic reduces fuel consumption by 8 percent. It also quickens response time when you're cruising along at low load and have a sudden, urgent need to be at wide-open throttle. And peak torque (still 300 pound-feet) comes in at just 1,200 rpm now instead of 1,400 with the N54 engine. Peak horsepower is still listed at 300, but the power curve doesn't taper off as soon.

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  2. ge0

    ge0 New Member

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    its built by the Germans, I trust it.
     
  3. Mofolicious

    Mofolicious New Member

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    where's your toque, eh?
  4. Bob Loblaw

    Bob Loblaw Guest

    that's a really odd twin scroll manifold

    dont they usually send cylinders 1,3, 5 to one part and 2, 4, 6 to the other part?
     
  5. Bob Loblaw

    Bob Loblaw Guest

    you know they make good stuff
     
  6. Dave

    Dave This is no motherfucking game OT Supporter

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    where's that midget
     
  7. thumpr

    thumpr someone you trust is one of us OT Supporter

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    the question will be

    will it last ten years or will it last a week?
     
  8. Mitchj

    Mitchj OT Supporter

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    whats the bet it makes 300hp and probably uses less fuel than our regular v6's
     
  9. Mitchj

    Mitchj OT Supporter

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    that valvetronic system sounds pretty neat. Does that control regular valve cycle and means it doesnt need a timing belt?
     
  10. The Bob Loblaw Law Blog

    The Bob Loblaw Law Blog OT Supporter

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    it must feel good to show affection to something german
     
  11. Seeker

    Seeker Brofessional OT Supporter

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    Interesting. Maybe a twin-turbo version of this revised I6 will be the M3 powerplant.
     
  12. Checker-Stripe

    Checker-Stripe Survey says...

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    :rofl:
     
  13. Mitchj

    Mitchj OT Supporter

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    maybe, but i really cant see an engine with turbos, and the throttle controlled by the valvelogic system not a throttle body going down well as a m3.
     
  14. Seeker

    Seeker Brofessional OT Supporter

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    Well, the next M3 is supposed to get a turbo 6cyl. I was wondering if they'd really try to boost the current twin-turbo I6 that much, but I guess they won't. Getting better performance with this new single turbo engine allows room for a second turbo to be added for the M3.

    The M3 has had individual throttle bodies for awhile. Maybe BMW thinks they can simulate that or even improve on it with the valvelogic.
     

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