N54/N55 335i

Bungle009 · 12-23-2011, 02:35 PM

I understand that LCI cars typically have the N55 (single turbo) engine. I also hear that quite a few N54 engine cars have trouble with HPFP, injectors, Turbo's etc.

I know that the tuning potential of the N55 is less than the N54, but is the reliability of the N55 significantly better ?

N54 Pros, Very tuneable, Twin Turbo (Parallel running) (400hp with Map), Cons, can be unreliable.
N55 Pros, More MPG, More reliable ? Cons, Less Tuneable (350hp with Map)

Can you confirm if i have this correct.

Thanks.

zltm089 · 12-23-2011, 04:45 PM

plus one...

would like to know what are the main differences between the n54 and n55....

phil200tdi · 12-24-2011, 06:12 AM

N54 - twin turbo

N55 - twin scroll (single) turbo.

Not sure n55 is any more reliable.

phil200tdi · 12-24-2011, 06:14 AM

N55 was introduced in mid 2009 iirc. Mine is lci 11/08 but n54.

12-23-2011, 02:35 PM	#1
Bungle009 Lieutenant 10 Rep 579 Posts Drives: E92 M3 Join Date: Nov 2009 Location: Alton iTrader: (0)	N54/N55 335i I understand that LCI cars typically have the N55 (single turbo) engine. I also hear that quite a few N54 engine cars have trouble with HPFP, injectors, Turbo's etc. I know that the tuning potential of the N55 is less than the N54, but is the reliability of the N55 significantly better ? N54 Pros, Very tuneable, Twin Turbo (Parallel running) (400hp with Map), Cons, can be unreliable. N55 Pros, More MPG, More reliable ? Cons, Less Tuneable (350hp with Map) Can you confirm if i have this correct. Thanks. Last edited by Bungle009; 12-24-2011 at 06:47 AM..
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12-23-2011, 04:45 PM	#2
zltm089 Banned 244 Rep 7,690 Posts Drives: 335i SE Coupe Space Grey Join Date: Nov 2008 Location: LONDON iTrader: (0) Garage List 2006 BMW 335i [10.00]	plus one... would like to know what are the main differences between the n54 and n55....
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12-24-2011, 06:12 AM	#3
phil200tdi Colonel 112 Rep 2,621 Posts Drives: 335i M Sport E90 LCI manual Join Date: Jan 2011 Location: Aylesbury iTrader: (1)	N54 - twin turbo N55 - twin scroll (single) turbo. Not sure n55 is any more reliable. __________________ Car: e91 330d with Viezu map Gone but not forgotten: 2010 Jaguar XFR (Cat-back exhaust, pulley, intake mods and map), Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)
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12-24-2011, 06:14 AM	#4
phil200tdi Colonel 112 Rep 2,621 Posts Drives: 335i M Sport E90 LCI manual Join Date: Jan 2011 Location: Aylesbury iTrader: (1)	N55 was introduced in mid 2009 iirc. Mine is lci 11/08 but n54. __________________ Car: e91 330d with Viezu map Gone but not forgotten: 2010 Jaguar XFR (Cat-back exhaust, pulley, intake mods and map), Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)
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