BMWNA acknowledges N54 engine turbo lag issue

News | November 18th, 2008 by 10
bmw n54 turbo 2

BMWNA has just issued a statement regarding the turbo lag issue that some of you might have noticed with your 3.0 twin-turbo engine(N54). I am …

bmw n54 turbo 2

BMWNA has just issued a statement regarding the turbo lag issue that some of you might have noticed with your 3.0 twin-turbo engine(N54). I am one of those people that noticed an issue with the engine, but when I took my car to the dealership, they couldn’t find anything wrong with it. 

I’m glad they finally acknowledged the potential issue and that measurements are being taken.


“In an effort to address specific noise concerns, BMW updated the turbocharged engine software on 335i/xi and 535i/xi models built from June 2006 through March 2008. The updated software causes a small amount of increased “turbocharger lag” under certain circumstances and, while not substantial, the lag may be perceptible to the most sensitive BMW drivers. X6, 135i, and 3 Series/5 Series vehicles from March 2008 production onward are not affected.

Release of the new software to restore the original turbocharger response is planned for January 2009, and it will be available for vehicles produced from September 2007 through March 2008 when they are brought to an authorized BMW center for a repair which requires a programming update. Clients with vehicles produced from June 2006 through September 2007 may request installation of the January 2009 software update.

Clients who get this update should understand that there is a possibility of slightly increased engine noise levels under certain circumstances.”

[Source: Bimmerfile and BMWCCA]

10 responses to “BMWNA acknowledges N54 engine turbo lag issue”

  1. Jon H says:

    more noise isnt always a bad thing….

  2. Gragop says:

    I wish I had a 3.0L inline 6 to have a problem with!

  3. Kevin G says:

    I love my 328 – no lag and no unwanted noise!

  4. wade russell says:

    Yepper! Bully for BMWNA ! And thanx for being so responsive to your base and fixing this issue! GM and BlueOval could learn a thing or 3 ! Wade

  5. andrew b says:

    Great, BMW. You admitted a mistake. How about admitting one more…

    like the X6.

  6. Clara says:

    How exactly are these turbos regulated? Throttle valve + AFR + fixed blowoff?

    Or are these variable-geometry turbos, with the exhaust vanes?

    hmmmm???? Just trying to understand how this happened via the ecu.

  7. Kurt says:

    Oh, it’s not a slight lag….it’s a huge lag and very noticeable; it’s about time.

  8. to support the last post: Its a huge lag. It makes the car feel like it has a load of bricks in the back. You push the gas pedal down and the car takes a significant time to catch up. In my case the symptom is variable.

    I took the car to the dealer several times and complained about it, however they never found anything.

    Today, I asked the dealer about getting the new software and I got the run around.

    Has anyone else tried?

  9. Bassem says:

    Hi , I have problem in N54 twin turbo , each time i fix it and it will broke again , anyone has a solution ? or any recommendation ?
    I have X6 2009

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