Originally Posted by ezmaass
"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."
This makes absolutely no sense to me??? Isn't the "turbo lag" for those running version 29.2?? Not the early production vehicles....
Has anyone thought that this BMW response is to get the early production vehicles updated to actually decrease the output? I have a Sept 2006 (first run) production of the 2007 e92 335i and yes, this is the same production that generated all the early magazine reviews that clocked 0-60 in 4.8 to 4.9 seconds (track times that could not be replicated in stock 2008 models).
Personally, I would never consider upgrading this this new software unless other e90posters have pre and post track data that show faster lap times as a result of this new software upgrade.
...just my 2 cents.