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      09-05-2011, 11:52 PM   #1
Chunkaway
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When Did BMW Switch from N54 to N55?

I posted this on the BMW forum, but I figured I'd try over here as well.

When did BMW switch over from the N54 to the N55? 2010? 2011?

I'm asking because I'm of the belief that the N55 single turbos have had fewer issues with the HPFP than the N54. But perhaps someone could enlighten me a bit.

Thanks!
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      09-06-2011, 12:18 AM   #2
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MY 2010 were the last N54 powered 1's & 3's unless its a 1M or 335is

Sadly the N55 doesnt eradicate HPFP issues, but apparently here in Canada they are a BMW warrantied part for 10 years or 200,000kms (but you'll no doubt have to eat the labour charges)
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      09-06-2011, 12:28 AM   #3
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Might wanna read this:-

http://www.1addicts.com/forums/showthread.php?t=579219
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      09-06-2011, 08:33 AM   #4
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Quote:
Originally Posted by Chunkaway View Post
When did BMW switch over from the N54 to the N55? 2010? 2011?

I'm asking because I'm of the belief that the N55 single turbos have had fewer issues with the HPFP than the N54. But perhaps someone could enlighten me a bit.

Thanks!
Basically IF its a 2010 its a N54(twin turbo) and if its a 2011, its a N55 (single dual scroll turbo). But BMW DID make some N55's along side with N54';s in the months of Sept, Oct, Nov of 2009 and then again in Feb, 2010 (both engines were being used) So a car built late in the year, could have either engine. But that is a rare case. Like I said, most (if not all 2010''s are N54's and all 2011's are N55's. N55 SOP (start of production) started in Feb, 2010. The latest design HPFP did not come out until May or June of that year(i believe).

My tuner told me IF the HPFP is made by Bosch... it is junk and it WILL fail, not if but WHEN. IF you have a Conti made HPFP... they seem to hold up well. Either way... there have been some N55 engines with HPFP issues.


Dackel
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      09-06-2011, 10:07 PM   #5
Chunkaway
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Quote:
Originally Posted by Dackelone View Post
Basically IF its a 2010 its a N54(twin turbo) and if its a 2011, its a N55 (single dual scroll turbo). But BMW DID make some N55's along side with N54';s in the months of Sept, Oct, Nov of 2009 and then again in Feb, 2010 (both engines were being used) So a car built late in the year, could have either engine. But that is a rare case. Like I said, most (if not all 2010''s are N54's and all 2011's are N55's. N55 SOP (start of production) started in Feb, 2010. The latest design HPFP did not come out until May or June of that year(i believe).

My tuner told me IF the HPFP is made by Bosch... it is junk and it WILL fail, not if but WHEN. IF you have a Conti made HPFP... they seem to hold up well. Either way... there have been some N55 engines with HPFP issues.


Dackel
Thank you very much! This is why I was so confused! I had read about the mixing of the N55 with the N54 during production runs, but I couldn't figure out if the complete switch had been made. This clears things up!
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      09-07-2011, 12:37 PM   #6
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Quote:
Originally Posted by Chunkaway View Post
I posted this on the BMW forum, but I figured I'd try over here as well.

When did BMW switch over from the N54 to the N55? 2010? 2011?

I'm asking because I'm of the belief that the N55 single turbos have had fewer issues with the HPFP than the N54. But perhaps someone could enlighten me a bit.

Thanks!
2011 first to have N55 and DCT
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      09-07-2011, 02:12 PM   #7
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