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Old 11-19-2008, 12:37 PM   #1
AVANTI R5
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Default BMW acknowledges N54 engine turbo lag, releases software update



Latest software will address turbo lag issue but may increase engine noise

Quote:
In an effort to address specific noise concerns, BMW in the United States updated the turbocharged ]engine software on 335i/xi and 535i/xi models built from June 2006 through March 2008. However, the updated software caused a small amount of increased turbocharger lag under certain circumstances, which BMW confirmed is noticeable and now plans to address by releasing a new update.

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 that requires a programming update.

Owners with vehicles produced from June 2006 through September 2007 may also request installation of the January 2009 software update. However, BMW states that changing to new software may increase engine noise levels under certain circumstances.

Other vehicles that use the same N54 3.0L twin-turbo six, such as the X6, 135i, as well as 3-series and 5-series models produced from March onwards are not affected. Earlier this year, a global panel of judges awarded the 300hp N54 as engine of the year, picking it for its flexibility and mix of performance and fuel-economy.
http://www.motorauthority.com/bmw-ac...re-update.html
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Old 11-19-2008, 04:38 PM   #2
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I wonder if BMW owners are just complaining about some turbo whistling noises
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Old 11-19-2008, 07:29 PM   #3
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so i assume subaru has no plan to do anything about the gutless 4cyl below 3500 rpm...
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Old 11-19-2008, 08:34 PM   #4
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07 owners can only dream....
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Old 11-19-2008, 10:52 PM   #5
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It's difficult to imagine turbo lag on a 3.0L engine with 10.2:1 compression ratio.
This engine should have stellar off boost response regardless of what is going on with the turbos. I think the problem is more serious than a simple lag issue....
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Old 11-19-2008, 11:26 PM   #6
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Quote:
Originally Posted by neg_matnik View Post
It's difficult to imagine turbo lag on a 3.0L engine with 10.2:1 compression ratio.
This engine should have stellar off boost response regardless of what is going on with the turbos. I think the problem is more serious than a simple lag issue....
It's not. The wastegates were noisy at cruise, so BMW kept them open for longer with the last update, which of course changes the throttle response.
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Old 11-20-2008, 12:04 AM   #7
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Quote:
Originally Posted by JuggernautTCW View Post
so i assume subaru has no plan to do anything about the gutless 4cyl below 3500 rpm...


Yeah, I'm sure they are working on making the engine increase it's own displacement or compression below 3500rpm to spool up the turbo quicker...


wat?


Honestly where does that figure come from anyway, even my EJ20 spools well before 3500rpm, I can't imagine the EJ25's not doing better...?
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Old 11-20-2008, 01:38 AM   #8
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Quote:
Originally Posted by Skunkers View Post


Yeah, I'm sure they are working on making the engine increase it's own displacement or compression below 3500rpm to spool up the turbo quicker...

wat?

Honestly where does that figure come from anyway, even my EJ20 spools well before 3500rpm, I can't imagine the EJ25's not doing better...?
It comes from post EPA changes that fiddle with the MY07 fuel mapping and OL/CL delay. '07's are prone to stuttering between 3.5-4k rpm. Mine in particular is a complete dog under 3.5k.
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Old 11-20-2008, 02:46 AM   #9
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Quote:
Originally Posted by Skunkers View Post


Yeah, I'm sure they are working on making the engine increase it's own displacement or compression below 3500rpm to spool up the turbo quicker...


wat?


Honestly where does that figure come from anyway, even my EJ20 spools well before 3500rpm, I can't imagine the EJ25's not doing better...?
He's obsessed with low end torque, you don't want to know lol
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Old 11-20-2008, 06:36 AM   #10
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Quote:
Originally Posted by SoobZero View Post
It comes from post EPA changes that fiddle with the MY07 fuel mapping and OL/CL delay. '07's are prone to stuttering between 3.5-4k rpm. Mine in particular is a complete dog under 3.5k.
Fer chrissakes -- get a tune, already.
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Old 11-20-2008, 07:30 AM   #11
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does anyone have that engine cutaway in a higher resolution?
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Old 11-20-2008, 11:34 AM   #12
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Quote:
Originally Posted by SoobZero View Post
It comes from post EPA changes that fiddle with the MY07 fuel mapping and OL/CL delay. '07's are prone to stuttering between 3.5-4k rpm. Mine in particular is a complete dog under 3.5k.
my car goes from 2.5k on like no other, but those throttle and open/closed maps have been "fixed"

honestly though, the 07 sti is balls out fast once you fix that crap, not even touching the fuel ignition or boost

-mike
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Old 11-20-2008, 11:52 AM   #13
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Originally Posted by EtoS View Post
He's obsessed with low end torque, you don't want to know lol
bow down to the god of the almighty low end torque
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