F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > So is the N55 a much more reliable motor than the N54?
TAG Motorsports
Post Reply
 
Thread Tools Search this Thread
      11-27-2012, 01:14 PM   #1
Konig Ludwig
Private First Class
 
Konig Ludwig's Avatar
 
Drives: BMW
Join Date: Oct 2011
Location: Phoenix

Posts: 175
iTrader: (0)

So is the N55 a much more reliable motor than the N54?

I know this has probably been beaten to death, but would like to know first hand impressions.
Konig Ludwig is offline  
0
Reply With Quote
      11-27-2012, 02:14 PM   #2
Cyberdemon
Captain
 
Drives: 2013 335i M Sport
Join Date: Jun 2012
Location: Long Island NY

Posts: 746
iTrader: (0)

There's no such thing as an "impression" when it comes to reliability, just statistics.

Since anyone on an internet forum would be making up results out of thin air, or based on claims like consumer reports, etc, it's not worth having a discussion.

If you asked a BMW quality engineer, I'm going to take a guess and say yes, the N55 is more reliable. Why? Because they sat there for 4 years and analyzed all the failures on the N54 and redesigned it to improve the quality (go Six Sigma!).
__________________
2013 335i M Sport /// Alpine White/Coral Red
Cyberdemon is offline  
0
Reply With Quote
      11-27-2012, 08:45 PM   #3
claykin
Lieutenant Colonel
 
Drives: 2014 335i M-Sport
Join Date: Nov 2009
Location: Florida

Posts: 1,878
iTrader: (0)

And probably inadvertently broke a few things while they were at it.

That's partly why we have another new motor on the way.
claykin is offline   United_States
0
Reply With Quote
      11-27-2012, 08:57 PM   #4
SamE30
New Member
 
Drives: 99 Plymouth Neon
Join Date: Nov 2012
Location: Canada

Posts: 14
iTrader: (0)

I saw one N55 car at work that killed a head and crank, then seized solid.

Other then that, they are pretty good, as long as you do in between oil changes, you'll be fine.
SamE30 is offline   Canada
0
Reply With Quote
      11-27-2012, 09:29 PM   #5
martinf79
Captain
 
martinf79's Avatar
 
Drives: F30 335i M Sport
Join Date: May 2012
Location: Toronto, Canada

Posts: 640
iTrader: (0)

Quote:
Originally Posted by SamE30 View Post
I saw one N55 car at work that killed a head and crank, then seized solid.

Other then that, they are pretty good, as long as you do in between oil changes, you'll be fine.
Sorry ... in between the standard 24k km regularly scheduled oil changes???
__________________

2013 335i ///M-Sport | MPPK ON ORDER | AW | BD Leather | 19” M3 ZCP Wheels | M-Sport Brakes | Adaptive M-Suspension | Variable Sport Steering | Premium Package | Enhanced Bluetooth | Sirius | BMW Apps | Heads Up Display | Speed Limit Info | M Performance Grill | Front/Rear Painted Reflectors | Coded
martinf79 is offline  
0
Reply With Quote
      11-27-2012, 09:53 PM   #6
justinnum1
Brigadier General
 
Drives: 2013 335i Msport
Join Date: Nov 2006
Location: South Florida

Posts: 3,998
iTrader: (0)

never had one issue with both my N54's.
__________________
F30 335i Msport Estoril Blue/Black leather sport auto. black grills, Performance Exhaust, HK,
justinnum1 is offline  
0
Reply With Quote
      11-27-2012, 10:34 PM   #7
shivaswrath
Brigadier General
 
shivaswrath's Avatar
 
Drives: 2012 335i
Join Date: Apr 2008
Location: Lost in NJ

Posts: 3,073
iTrader: (3)

Quote:
Originally Posted by SamE30
I saw one N55 car at work that killed a head and crank, then seized solid.

Other then that, they are pretty good, as long as you do in between oil changes, you'll be fine.
That's more than likely an outlier than the norm.
Regular 15k changes wouldn't be factory standard otherwise... It costs them more to replace an engine than change the oil.
__________________
2012 335i Mineral Gray
M Performance Whore: PPK|Exhaust|Brakes|Performance Suspension Struts & Springs|LSD|Black Kidney Grilles|CF Spoiler and Mirror Caps|Bav Stage 1|400Ms|BMWF30.com
shivaswrath is offline   United_States
0
Reply With Quote
      11-27-2012, 10:42 PM   #8
rallybull
Captain
 
rallybull's Avatar
 
Drives: F30 335i w/PPK
Join Date: Jul 2012
Location: USA

Posts: 801
iTrader: (0)

As far as what I have read and understood, the HPFP failure issues were associated with the N54 engines. Not sure if N55s have seen the same issue.
rallybull is offline   United_States
0
Reply With Quote
      11-27-2012, 10:56 PM   #9
SamS
Brigadier General
 
SamS's Avatar
 
Drives: 2013 ActiveHybrid 3
Join Date: Jul 2010
Location: Dallas, TX

Posts: 4,528
iTrader: (0)

Quote:
Originally Posted by tojo_m View Post
As far as what I have read and understood, the HPFP failure issues were associated with the N54 engines. Not sure if N55s have seen the same issue.
The HPFP got redesigned for all F30s, and post-March 2012 E92/E93 cars. So, some N55 cars do have the old design. In other words, you can't correlate HPFP with just all N55 vs. N54 cars.
__________________
SamS is offline  
0
Reply With Quote
      12-19-2012, 07:51 PM   #10
dboucher30
New Member
 
Drives: E46 328i / F30 335i Sport
Join Date: Dec 2012
Location: Kaiserslautern

Posts: 34
iTrader: (0)

Both engines are good IMO. The main difference is the exhaust. The new N55 engine has one exhaust pipe the feeds from all 6 cylinder (for less fuel consumption) while the N54 had 2 pipes, one feeding from cylinders 1, 2, and 3 and another pipe feeding from cylinders 4, 5, and 6.
dboucher30 is offline   Germany
0
Reply With Quote
      12-19-2012, 09:44 PM   #11
shivaswrath
Brigadier General
 
shivaswrath's Avatar
 
Drives: 2012 335i
Join Date: Apr 2008
Location: Lost in NJ

Posts: 3,073
iTrader: (3)

Well there were 2 turbos in the N54 so you kind of needed 2 pipes no?
__________________
2012 335i Mineral Gray
M Performance Whore: PPK|Exhaust|Brakes|Performance Suspension Struts & Springs|LSD|Black Kidney Grilles|CF Spoiler and Mirror Caps|Bav Stage 1|400Ms|BMWF30.com
shivaswrath is offline   United_States
0
Reply With Quote
      01-22-2013, 09:56 PM   #12
Appeltje
Enlisted Member
 
Drives: BMW 335i E92 2013
Join Date: Jan 2013
Location: The Woodlands

Posts: 47
iTrader: (0)



Quote:
Originally Posted by shivaswrath View Post
Well there were 2 turbos in the N54 so you kind of needed 2 pipes no?
Appeltje is offline   United_States
0
Reply With Quote
      01-22-2013, 10:02 PM   #13
claykin
Lieutenant Colonel
 
Drives: 2014 335i M-Sport
Join Date: Nov 2009
Location: Florida

Posts: 1,878
iTrader: (0)

The N55 is only as reliable as the one BMW built for you. And how well you take care of it.

Overall the N54 is a more complicated design. It also has some higher end components such as the piezo injectors and true dual turbos. N55 is what most would consider a cost reduced version of the N54.
claykin is offline   United_States
0
Reply With Quote
      01-23-2013, 09:32 AM   #14
shivaswrath
Brigadier General
 
shivaswrath's Avatar
 
Drives: 2012 335i
Join Date: Apr 2008
Location: Lost in NJ

Posts: 3,073
iTrader: (3)

Quote:
Originally Posted by claykin View Post
The N55 is only as reliable as the one BMW built for you. And how well you take care of it.

Overall the N54 is a more complicated design. It also has some higher end components such as the piezo injectors and true dual turbos. N55 is what most would consider a cost reduced version of the N54.
that is so true...

I took my car in for service this morning, to replace the fabled Rusty Seat Frames and deal with some minor squeaks.

The Loaner F30 328xi they gave me, mind you with 10 miles on the odo, threw an alert after driving for 5 miles that the engine oil pressure is too low...BRAND NEW 328xi and already has issues.

I'm unsure I'll own another BMW after this one, given how hit or miss their build quality has been thus far...they loaned me a E90 328i, with 11k on the odo, nary an issue. The steering feel is pretty nice too....
__________________
2012 335i Mineral Gray
M Performance Whore: PPK|Exhaust|Brakes|Performance Suspension Struts & Springs|LSD|Black Kidney Grilles|CF Spoiler and Mirror Caps|Bav Stage 1|400Ms|BMWF30.com
shivaswrath is offline   United_States
0
Reply With Quote
      01-23-2013, 10:46 AM   #15
justinnum1
Brigadier General
 
Drives: 2013 335i Msport
Join Date: Nov 2006
Location: South Florida

Posts: 3,998
iTrader: (0)

Quote:
Originally Posted by shivaswrath View Post
that is so true...

I took my car in for service this morning, to replace the fabled Rusty Seat Frames and deal with some minor squeaks.

The Loaner F30 328xi they gave me, mind you with 10 miles on the odo, threw an alert after driving for 5 miles that the engine oil pressure is too low...BRAND NEW 328xi and already has issues.

I'm unsure I'll own another BMW after this one, given how hit or miss their build quality has been thus far...they loaned me a E90 328i, with 11k on the odo, nary an issue. The steering feel is pretty nice too....
So you had an issue on a First year new model car but not an issue on a car in it's 6th year of the build cycle(e90).....
__________________
F30 335i Msport Estoril Blue/Black leather sport auto. black grills, Performance Exhaust, HK,
justinnum1 is offline  
0
Reply With Quote
      01-23-2013, 11:18 AM   #16
shivaswrath
Brigadier General
 
shivaswrath's Avatar
 
Drives: 2012 335i
Join Date: Apr 2008
Location: Lost in NJ

Posts: 3,073
iTrader: (3)

Quote:
Originally Posted by justinnum1 View Post
So you had an issue on a First year new model car but not an issue on a car in it's 6th year of the build cycle(e90).....
it's a 2013, so technically a second year build.

There's NO excuse for an engine issue like low oil pressure on a new car - even if the sensor is faulty because it was below freezing and the oil hadn't warmed up, if the warning WAS correct, I would've grenaded the engine. That's pathetic.
__________________
2012 335i Mineral Gray
M Performance Whore: PPK|Exhaust|Brakes|Performance Suspension Struts & Springs|LSD|Black Kidney Grilles|CF Spoiler and Mirror Caps|Bav Stage 1|400Ms|BMWF30.com
shivaswrath is offline   United_States
0
Reply With Quote
      01-23-2013, 12:49 PM   #17
justinnum1
Brigadier General
 
Drives: 2013 335i Msport
Join Date: Nov 2006
Location: South Florida

Posts: 3,998
iTrader: (0)

Quote:
Originally Posted by shivaswrath View Post
it's a 2013, so technically a second year build.

There's NO excuse for an engine issue like low oil pressure on a new car - even if the sensor is faulty because it was below freezing and the oil hadn't warmed up, if the warning WAS correct, I would've grenaded the engine. That's pathetic.
Actually, Xdrive cars first started as 2013 model years. and the N20 has been around for a while now.

Regardless, there are always going to be a few bad apples.

Any other car manufacturer has similar issues. Not every car is going to be perfect.
__________________
F30 335i Msport Estoril Blue/Black leather sport auto. black grills, Performance Exhaust, HK,
justinnum1 is offline  
0
Reply With Quote
      01-26-2013, 11:44 AM   #18
dd1981
Kapetan Svog Života
 
dd1981's Avatar
 
Drives: 2012 335i sport
Join Date: Dec 2010
Location: Chicago

Posts: 1,678
iTrader: (0)

Garage List
Quote:
Originally Posted by Konig Ludwig View Post
I know this has probably been beaten to death, but would like to know first hand impressions.
To me its more like what are you willing to put up with?

HPFP faliures on these cars or driving around a P car with intermediate shaft that is a ticking time bomb and ready to grenade at any given moment without notice, wich by the way a crate motor from Porsche is 19k.

Yeah Id take the HPFP problems 2-3 hours at the dealer and youre on your way

Honestly no one knows yet if n55 is better. So far so good, but it has its own share of small issues.
__________________
Custom Modified OEM Muffler,
back
dd1981 is offline   Serbia
0
Reply With Quote
      01-26-2013, 01:01 PM   #19
shivaswrath
Brigadier General
 
shivaswrath's Avatar
 
Drives: 2012 335i
Join Date: Apr 2008
Location: Lost in NJ

Posts: 3,073
iTrader: (3)

Quote:
Originally Posted by justinnum1 View Post
Actually, Xdrive cars first started as 2013 model years. and the N20 has been around for a while now.

Regardless, there are always going to be a few bad apples.

Any other car manufacturer has similar issues. Not every car is going to be perfect.
I don't doubt it, but it's still comical/ironic that I take my car in for issues, get a loaner, and the loaner has issues.

So far, knock on wood, I've only had surface/cosmetic type issues with my 335i - engine has been strong (so far only consumed a quart of oil in 7500 miles), suspension has been awesome (after the upgrade), brakes haven't squealed, and I've enjoyed 28-30 mpg.

I just wonder what troubles are coming down the pike...or if I'm in the clear. Was one reason why I got the 100k warranty, once I started having problems, I wanted some peace of mind.
__________________
2012 335i Mineral Gray
M Performance Whore: PPK|Exhaust|Brakes|Performance Suspension Struts & Springs|LSD|Black Kidney Grilles|CF Spoiler and Mirror Caps|Bav Stage 1|400Ms|BMWF30.com
shivaswrath is offline   United_States
0
Reply With Quote
      02-02-2013, 08:14 AM   #20
Dabaitu
Colonel
 
Drives: anything given a chance
Join Date: Jul 2008
Location: .au

Posts: 2,958
iTrader: (0)

Garage List
Quote:
Originally Posted by claykin View Post
The N55 is only as reliable as the one BMW built for you. And how well you take care of it.

Overall the N54 is a more complicated design. It also has some higher end components such as the piezo injectors and true dual turbos. N55 is what most would consider a cost reduced version of the N54.
The N54 also uses forged pistons, not cast ones, among some other things I can't recall this late at night. If you were going to go nuts out and tune your car significantly, I'd pick an N54 engine over the N55.

OP -If you're just a daily driver with ambition, it's not going to matter to you.
Dabaitu is offline   Australia
0
Reply With Quote
      08-03-2013, 10:13 PM   #21
Platformer
New Member
 
Drives: 2011 335i X-Drive
Join Date: Apr 2012
Location: Colorado Springs

Posts: 8
iTrader: (0)

N55 Data Sheet

Overall I would recommend reading the data sheet for the engine to determine the differences yourself and make your own call. I will try to attach a copy. When discussing reliability it appears that the connecting rods to the pistons have been redesigned to better distribute the load placed on them. The VANOS oil passages in the engine are less complex, the oil management of the engine has had multiple overhauls compared to the n54 with changes to the crankcase and oil pan, and oil pump. It mentions that the HPFP is still the same design as the N54, and covers the difference in the fuel injectors from the Piezo-electric ones to Bosch.

Overall I would be willing to bet that the N55 would be more reliable as mentioned earlier for the simple fact that they took data from the N54 and improved upon many systems. I can't say whether or not the change in forged parts will affect reliability when tuned. Seeing as the engine is currently having issues reaching 400hp due to the twin scroll turbo limitations I doubt you will ever run into power levels that would make these parts a necessity. That is speculation tho. Only time will really tell
Attached Images
File Type: pdf N55 Engine.pdf (3.22 MB, 1328 views)
Platformer is offline  
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 04:36 AM.




f30post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST