2007 Engine Tech: How the N54 works (must read!!!)

Padfan9 · 07-21-2011, 11:11 PM

Does anyone know why it shows there are 2 BOV's for the N54....I may have read that wrong...when buying an aftermarket BOV, you only buy one, so the stock is just a wastegate right? or bypass valve?

R1000K3 · 07-22-2011, 01:43 AM

There are two diverter valves on the N54 because it has twin turbos. There are also two wastegates by the same reason. BOV's are used to replace diverter valves if you prefer BOV's.

spottedhyena · 07-29-2011, 08:06 PM

very nice and informative

SpeedRacer · 08-30-2011, 10:46 PM

Great info. As a new owner of a 2007 335i Coupe with only 30,000 miles I really appreciate the date presented here. Thank you

USAF Rick · 09-14-2011, 12:39 PM

Love this post.

hsantiago335 · 09-20-2011, 06:56 PM

great read very interesting to find out all the small little details with the turbocharging system

V-Viper · 10-28-2011, 09:45 AM

Some great infomation here, for anyone interested in learning about the N54/N55 or just a modern turbo charged engine. Far cry from the small block chevys/fords.

OkashiiKen · 11-03-2011, 01:26 PM

Thanks again for the great post - super informative for a newcomer like myself.

Q8_TwinTurbo · 11-12-2011, 10:00 PM

Ksfrogman,

Thanks for sharing this valuable information. Helps so much to know where everything is located inorder to install aftermarket parts in the likes of intercooler, blow off valves etc.

muzzammil15 · 01-30-2012, 07:53 PM

Quick question, are the turbo inlet tube which hooks up to the intake box, 2.5 inches or 2 1/4 inches? Thanks!

OEM99 · 06-28-2012, 10:53 PM

bump, thanks for the great info!

USAF Rick · 06-29-2012, 12:43 AM

That was a lot to read but man I understand my car so much better now.

jdnguye90 · 07-08-2012, 12:52 AM

Great info. Thank you for this thread.

scuber · 08-06-2012, 06:06 AM

Thanks for great info~

ksfrogman · 08-21-2012, 12:04 PM

You're welcome.

MGT81 · 08-30-2012, 12:05 AM

Bump!!

amilo123 · 09-26-2012, 07:31 PM

does anyone have something similar for the N43 engine?

fixedreality · 12-09-2012, 02:26 AM

Very interesting read

ZNITE · 12-16-2012, 11:34 PM

Thanks for posting.....Great info

x986 · 12-27-2012, 12:27 PM

FWIW
I'm the original owner of a 2007.5 coupe with the N54 that I picked up at the factory. (The mid year changes mainly consisted of extra colors and an I-Drive improvement that gives programable buttons.) I have 50K on it, and have NEVER had a problem with the engine (or anything). I got the Dinan tune (there was only one at that time, 400hp and 400 #/ft) when the car was about 4-6 months old. The car has the factory oil cooler and has been through all the factory recommended and mandatory updates for the HPFP problems. Only one of the reflashes wiped out the Dinan tune, and I had that re-installed for the cost of 45 min. labor for a Stage II tune.

The bottom line is that this is the greatest car ever made! I have NEVER kept a car for more than 2-3 years, and this one is 5 years old. I'm starting to get the new car itch, but other than a very few minor things, there is nothing out there better, and I will probably keep it.

My experience says: "If you're thinkiing of keeping your N54 beyond 30-40K, do it. If you're thinking of buying used, do it. Don't worry about the OLD bad rep."

YMMV

dlbrooks18 · 12-27-2012, 03:11 PM

N54 is a marvel of an engine!

GoRomeo · 12-27-2012, 03:31 PM

Thanks for sharing great info like this...

08-21-2012, 12:04 PM	#103
ksfrogman Major General Drives: E90 330i 6MT Join Date: Nov 2005 Location: Torrance, CA Posts: 6,749 iTrader: (12) Garage List 2006 330i [0.00] 2006 330i [0.00]	You're welcome. __________________
	0

12-27-2012, 03:11 PM	#109
dlbrooks18 Brigadier General Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles Posts: 3,475 iTrader: (2)	N54 is a marvel of an engine! __________________ 2008 E90 335
	0

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07-21-2011, 11:11 PM	#89
Padfan9 2011 BMW 335Is Drives: 2011 BMW 335is Join Date: Jun 2011 Location: California Posts: 159 iTrader: (1)	Does anyone know why it shows there are 2 BOV's for the N54....I may have read that wrong...when buying an aftermarket BOV, you only buy one, so the stock is just a wastegate right? or bypass valve?
	0

07-22-2011, 01:43 AM	#90
R1000K3 Major Drives: 335i MT Join Date: Jul 2009 Location: USA Posts: 1,312 iTrader: (0)	There are two diverter valves on the N54 because it has twin turbos. There are also two wastegates by the same reason. BOV's are used to replace diverter valves if you prefer BOV's.
	0

07-29-2011, 08:06 PM	#91
spottedhyena New Member Drives: '11 335i blacked out Join Date: Feb 2011 Location: USA Posts: 16 iTrader: (0)	very nice and informative
	0

08-30-2011, 10:46 PM	#92
SpeedRacer New Member Drives: 335i Coupe Space Grey Join Date: Aug 2011 Location: Jamison ,PA Posts: 7 iTrader: (0)	Great info. As a new owner of a 2007 335i Coupe with only 30,000 miles I really appreciate the date presented here. Thank you
	0

09-14-2011, 12:39 PM	#93
USAF Rick Private First Class Drives: Montego Blue 08 335i e92 Join Date: Sep 2011 Location: San Diego/Riverside, CA Posts: 163 iTrader: (4)	Love this post.
	0

09-20-2011, 06:56 PM	#94
hsantiago335 New Member Drives: 07 E90 335i 6MT Join Date: Sep 2011 Location: Long Island NY Posts: 8 iTrader: (0)	great read very interesting to find out all the small little details with the turbocharging system
	0

10-28-2011, 09:45 AM	#95
V-Viper Private Drives: 2007 BMW 335i Join Date: Oct 2011 Location: Brockton, MA Posts: 61 iTrader: (0)	Some great infomation here, for anyone interested in learning about the N54/N55 or just a modern turbo charged engine. Far cry from the small block chevys/fords.
	0

11-03-2011, 01:26 PM	#96
OkashiiKen Private Drives: E92 335i 6MT JB Join Date: Oct 2011 Location: Redmond, Wa Posts: 75 iTrader: (0) Garage List 2008 BMW 335i [0.00]	Thanks again for the great post - super informative for a newcomer like myself.
	0

11-12-2011, 10:00 PM	#97
Q8_TwinTurbo New Member Drives: 2010 E93 M3 Join Date: Jul 2011 Location: Kuwait Posts: 10 iTrader: (0)	Ksfrogman, Thanks for sharing this valuable information. Helps so much to know where everything is located inorder to install aftermarket parts in the likes of intercooler, blow off valves etc.
	0

01-30-2012, 07:53 PM	#98
muzzammil15 Slurpee anyone? Drives: 07 White 335i Join Date: Dec 2011 Location: VA beach Posts: 597 iTrader: (3)	Quick question, are the turbo inlet tube which hooks up to the intake box, 2.5 inches or 2 1/4 inches? Thanks!
	0

06-28-2012, 10:53 PM	#99
OEM99 New Member Drives: E90 Join Date: Jun 2012 Location: Los Angeles, Ca Posts: 23 iTrader: (0)	bump, thanks for the great info!
	0

06-29-2012, 12:43 AM	#100
USAF Rick Private First Class Drives: Montego Blue 08 335i e92 Join Date: Sep 2011 Location: San Diego/Riverside, CA Posts: 163 iTrader: (4)	That was a lot to read but man I understand my car so much better now.
	0

07-08-2012, 12:52 AM	#101
jdnguye90 New Member Drives: 2007 E92 335i Join Date: May 2012 Location: Silver Spring, MD Posts: 13 iTrader: (0)	Great info. Thank you for this thread.
	0

08-06-2012, 06:06 AM	#102
scuber New Member Drives: 2007 335i sedan Join Date: Oct 2011 Location: Los Angeles Posts: 28 iTrader: (0)	Thanks for great info~
	0

08-30-2012, 12:05 AM	#104
MGT81 First Lieutenant Drives: 335xi Join Date: Jun 2012 Location: Calgary Posts: 301 iTrader: (0)	Bump!!
	0

09-26-2012, 07:31 PM	#105
amilo123 Enlisted Member Drives: 318i Join Date: Aug 2012 Location: Romania Posts: 34 iTrader: (0)	does anyone have something similar for the N43 engine?
	0

12-09-2012, 02:26 AM	#106
fixedreality Private First Class Drives: 02' E46 M3 Join Date: Nov 2012 Location: SF Posts: 101 iTrader: (1)	Very interesting read
	0

12-16-2012, 11:34 PM	#107
ZNITE New Member Drives: E92 335i M-Sport Join Date: Nov 2012 Location: ATX Posts: 22 iTrader: (1)	Thanks for posting.....Great info
	0

12-27-2012, 12:27 PM	#108
x986 Private First Class Drives: e92 335, ex e46 M3 Join Date: Jan 2007 Location: North Bay Area, CA Posts: 134 iTrader: (0)	FWIW I'm the original owner of a 2007.5 coupe with the N54 that I picked up at the factory. (The mid year changes mainly consisted of extra colors and an I-Drive improvement that gives programable buttons.) I have 50K on it, and have NEVER had a problem with the engine (or anything). I got the Dinan tune (there was only one at that time, 400hp and 400 #/ft) when the car was about 4-6 months old. The car has the factory oil cooler and has been through all the factory recommended and mandatory updates for the HPFP problems. Only one of the reflashes wiped out the Dinan tune, and I had that re-installed for the cost of 45 min. labor for a Stage II tune. The bottom line is that this is the greatest car ever made! I have NEVER kept a car for more than 2-3 years, and this one is 5 years old. I'm starting to get the new car itch, but other than a very few minor things, there is nothing out there better, and I will probably keep it. My experience says: "If you're thinkiing of keeping your N54 beyond 30-40K, do it. If you're thinking of buying used, do it. Don't worry about the OLD bad rep." YMMV
	0

12-27-2012, 03:31 PM	#110
GoRomeo Lieutenant Colonel Drives: 330i Join Date: Feb 2006 Location: San Diego CA Posts: 1,879 iTrader: (0) Garage List 2006 330i [3.00]	Thanks for sharing great info like this...
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