N54 Turbo Lag Update (335 etc.)

We have been asked this question a lot lately: “What is going on with the turbo lag software update?”

We have some good news for all of you that fit the criteria BMWNA laid out in their official statement. The software is out and obtainable, though some dealers may need an arm twist.

Our original post here help spread the word initially. This follow up should answer the questions in regards to obtaining the update and what it entails.

The original BMWNA statement read the following:

“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.”

If your car fits within the required range you are entitled to the update. You can simply request it at the dealer but if your dealer is not cooperating give a call to BMW Customer Relations and they will get the ball rolling for you. You may be required to sign a waiver stating that wastegate noise will be present and that the car will not be updated or changed to eliminate this noise etc. and so forth.

A source provided us with the Technical Service Bulletin which provides the technicians and Service Advisors with the information on what software to update here