E90Fleet..what's the N51 all about?

mesier1111 · 06-11-2007, 07:17 AM

Quote:

Originally Posted by E90Fleet

Hi

The engine in your 328i is a N52KP ( also known as N52N )

It has a number of improvements over the original N52

the table I posted above shows lots of the changes between the original N52 and the N52KP

here are some of the changes aswell:

• New engine management (MSV80)
• New HFM (digital)
• New throttle - EGAS8 with magnetoresistive position feedback
• Plastic valve cover with integrated crankcase vent valve and oil separation
• Stronger connecting rods
• Exhaust valve stem increased to 6mm
• New electric water pump (2nd generation)
• Lightweight camshafts (hydroformed)

How do you not work for BMW?

E90Fleet · 06-11-2007, 07:53 AM

Quote:

Originally Posted by mesier1111

How do you not work for BMW?

That was just a cut and paste from a document sent by BMW NA to Dealer Service Managers

LEDZEP · 06-11-2007, 08:24 AM

Quote:

Originally Posted by E90Fleet

That was just a cut and paste from a document sent by BMW NA to Dealer Service Managers

And how is that different from what everyone in corporate jobs do?

You certainly should be working for BMW! On this we all agree. Hope things are progressing well for you!!

yessir! · 06-11-2007, 11:15 AM

+1!

and thanks for the reply.

ScBlacksunshine · 06-11-2007, 11:36 AM

Makes me kind of sad reading this knowing how many improvements went into the the N52Kp vs the original N52

and that's only after less then 2 yrs or so. Makes the N52 seems obsolete, almost like they rushed the N52 to get it out the door and improvement is an after thought...

tctic · 06-11-2007, 11:42 AM

Quote:

Originally Posted by ScBlacksunshine

Makes me kind of sad reading this knowing how many improvements went into the the N52Kp vs the original N52

and that's only after less then 2 yrs or so. Makes the N52 seems obsolete, almost like they rushed the N52 to get it out the door and improvement is an after thought...

The N52 (First version) was not rushed out. It was in the 630i since 2004 (if I remembered correctly) outside Canada and the USA.

RichReg · 06-11-2007, 12:22 PM

Quote:

Originally Posted by tctic

The N52 (First version) was not rushed out. It was in the 630i since 2004 (if I remembered correctly) outside Canada and the USA.

Correct...September 2004 (a few months after the 645Ci).

So the N52 was being produced for a full 18 months
before being changed to the N52KP in the E92 Coupe.

ScBlacksunshine · 06-11-2007, 12:26 PM

Quote:

Originally Posted by RichReg

Correct...September 2004 (a few months after the 645Ci).

So the N52 was being produced for a full 18 months
before being changed to the N52KP in the E92 Coupe.

So in another word, US customers got the shaft by getting something near its 1st version cycle

E90Fleet · 06-11-2007, 02:07 PM

USA was first to get the N52KP, as the 328i
Reason being BMW NA only wanted 2 engines, and 325i was too underpowered compared to 335i and 330i to near

Rest of the world have only started getting the N52KP asof April 2007 in areas outside europe that arnt getting the N53 Direct injection yet due to fuel requirements.

So N52 has been in full production for over 2,5 years and still remains in a production for a few models such as the 130i

RichReg · 06-11-2007, 03:24 PM

Quote:

Originally Posted by ScBlacksunshine

So in another word, US customers got the shaft by getting something near its 1st version cycle

Not really.
My point was that it was closer to its beginning rather than its end when it debuted here in the U.S. Besides, I don't find the differences in the chart from E90Fleet to be so dramatic anyway, except for maybe the connecting rods. Its more or less the same engine....

E90Fleet · 06-11-2007, 03:31 PM

Quote:

Originally Posted by RichReg

Not really.
My point was that it was closer to its beginning rather than its end when it debuted here in the U.S. Besides, I don't find the differences in the chart from E90Fleet to be so dramatic anyway, except for maybe the connecting rods. Its more or less the same engine....

Yes, they are very small changes

Rods were just changed because the Direct Injection N53 neeed the new ones, and to keep costs down they share the part

crex · 06-11-2007, 03:38 PM

Quote:

Originally Posted by E90Fleet

Yes, they are very small changes

Rods were just changed because the Direct Injection N53 neeed the new ones, and to keep costs down they share the part

could a 328i use the software from the z4 3.0si and the 3 stage intake manifold to be converted to the high output version. I would like to do this.

E90Fleet · 06-11-2007, 03:59 PM

Quote:

Originally Posted by crex

could a 328i use the software from the z4 3.0si and the 3 stage intake manifold to be converted to the high output version. I would like to do this.

1) Its very difficult ( eg how are you going to control the extra intake motors ? )
2) Its very expensive
3) not all 328i have N52, SULEV models have N51

There are many many many threads bout upgrading, especially ones asking about US 325i to 330i, which is a similar change

crex · 06-11-2007, 04:21 PM

Quote:

Originally Posted by E90Fleet

1) Its very difficult ( eg how are you going to control the extra intake motors ? )
2) Its very expensive
3) not all 328i have N52, SULEV models have N51

There are many many many threads bout upgrading, especially ones asking about US 325i to 330i, which is a similar change

Well i dont understand lol.
1.) Wouldnt the software control the extra intake motors,
2) I could purchase a 335 instead but I like the responsiveness of the NA engine and It feels lighter to me. So as long as the parts are not in excess of 2k should be fine. And couldnt the z4 3.0si software just be flashed onto my current ecu assuming I had a tech to do it for me.
3. I live in Virgina so it would be a ulev and not sulev

ScBlacksunshine · 06-11-2007, 04:28 PM

Quote:

Originally Posted by RichReg

Not really.
My point was that it was closer to its beginning rather than its end when it debuted here in the U.S. Besides, I don't find the differences in the chart from E90Fleet to be so dramatic anyway, except for maybe the connecting rods. Its more or less the same engine....

Quote:

Originally Posted by E90Fleet

Yes, they are very small changes

Rods were just changed because the Direct Injection N53 neeed the new ones, and to keep costs down they share the part

Good to know, makes me feel a little better

munda007 · 06-11-2007, 04:46 PM

Quote:

Originally Posted by STE92VE

No & No.....So far no issues with the N51 except I'm getting great gas mileage!

Isn't BMWNA oblidged to tell customer that he/she is getting SULEV with N51 and not ULEV with N52?

chbrules · 06-11-2007, 04:59 PM

How do we know which engine our car has? I'm guessing there's a serial number on the block somewhere? Don't the 335i's use the N54 engine? So I guess I have nothing to worry about? Am I being paranoid enough yet?

voltron1011 · 06-11-2007, 05:36 PM

328's throttle response is 100 times better than the 325's....

ska///235i · 06-11-2007, 05:46 PM

After reading 2 pages of N52s....etc

the 325 aint getting no Love

RichReg · 06-12-2007, 08:32 AM

Quote:

Originally Posted by ScBlacksunshine

Good to know, makes me feel a little better

Yeah, me too.....

Quote:

Originally Posted by voltron1011

328's throttle response is 100 times better than the 325's....

Agreed.
But I think the throttle response on my 330 is pretty damn good too!

munda007 · 06-13-2007, 08:09 PM

Quote:

Originally Posted by E90Fleet

1) Its very difficult ( eg how are you going to control the extra intake motors ? )
2) Its very expensive
3) not all 328i have N52, SULEV models have N51

There are many many many threads bout upgrading, especially ones asking about US 325i to 330i, which is a similar change

E90Fleet and others

I drove a 2007 328i non-SULEV today for comparison and I must say SULEV pick up is not as good as the regular 328i.

So In fact N52 is better engine than N51

STE92VE · 06-13-2007, 08:16 PM

Quote:

Originally Posted by munda007

E90Fleet and others

I drove a 2007 328i non-SULEV today for comparison and I must say SULEV pick up is not as good as the regular 328i.

So In fact N52 is better engine than N51

Thank you for your highly detailed, scientific reasoning.

06-11-2007, 11:15 AM	#26
yessir! New Member 0 Rep 5 Posts Drives: 2011 X6 5.0i Join Date: Jun 2007 Location: depends on the day... iTrader: (0)	+1! and thanks for the reply.
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06-11-2007, 11:36 AM	#27
ScBlacksunshine YUGO is my dream car 144 Rep 1,564 Posts Drives: Bayerische Motoren Werke Join Date: Mar 2006 Location: LBC iTrader: (2)	Makes me kind of sad reading this knowing how many improvements went into the the N52Kp vs the original N52 and that's only after less then 2 yrs or so. Makes the N52 seems obsolete, almost like they rushed the N52 to get it out the door and improvement is an after thought... __________________
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06-11-2007, 02:07 PM	#31
E90Fleet Lieutenant General 1312 Rep 10,185 Posts Drives: BMW Join Date: Apr 2005 Location: South Africa iTrader: (0)	USA was first to get the N52KP, as the 328i Reason being BMW NA only wanted 2 engines, and 325i was too underpowered compared to 335i and 330i to near Rest of the world have only started getting the N52KP asof April 2007 in areas outside europe that arnt getting the N53 Direct injection yet due to fuel requirements. So N52 has been in full production for over 2,5 years and still remains in a production for a few models such as the 130i __________________ BMW if you are reading, I need a job, Please.
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06-11-2007, 04:59 PM	#39
chbrules MSVConrad++ 54 Rep 778 Posts Drives: E90 2006 325i \| E92 2007 335i Join Date: Dec 2006 Location: Peaches iTrader: (0)	How do we know which engine our car has? I'm guessing there's a serial number on the block somewhere? Don't the 335i's use the N54 engine? So I guess I have nothing to worry about? Am I being paranoid enough yet? __________________ -Me
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06-11-2007, 05:36 PM	#40
voltron1011 Colonel 119 Rep 2,909 Posts Drives: 2011 135i, FJR-1300 Join Date: Apr 2005 Location: Wiesbaden iTrader: (2)	328's throttle response is 100 times better than the 325's....
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06-11-2007, 05:46 PM	#41
ska///235i ***** noob 1369 Rep 10,479 Posts Drives: 325xi>M235i>428GCx Mspor Join Date: Sep 2005 Location: Boston iTrader: (34) Garage List 2006 325xi [0.00]	After reading 2 pages of N52s....etc the 325 aint getting no Love __________________ 2006 325xi (Sold) 2014 M235I (Current) 2015 428xi Gran Coupe (STB)
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