525i Engine [Archive] - Bimmerfest - BMW Forums

: 525i Engine

05-10-2010, 10:18 PM
Got into a heated argument with a friend about my 07 525i. He claims they all have the N52B25 engine while I believe that all the 07's received the new N52B30 one's. Showed him the manual which clearly shows the displacement as 182.8/2996 which would be the N52B30 engine, he says the manual is wrong. Is there anywhere on the engine/car I can physically check to prove him wrong?

05-11-2010, 12:27 AM
The VIN??? :D


05-11-2010, 11:18 AM

05-11-2010, 11:36 AM
I have a 2006 525i and here's a portion of my VIN info showing that it's a 3.0L:

Type code NE53
Type 525I UL (USA)
Dev. series E60 ()
Line 5
Body type LIM
Steering LL
Door count 4
Engine N52
Cubical capacity 3.00
Power 160
Transmision HECK
Gearbox AUT
Prod. date 2005-11-17


That Wiki page seems confusing. It shows the 525i under the N52B25 engine. My manual shows 182.8/2996 as well.


05-11-2010, 11:38 AM
wikipedia is wrong yet again

Used BMW 5-Series Specs

2007 BMW 5-Series 525I Sedan Performance & Efficiency Standard Features
- 2,996 cc 3 liters in-line 6 front engine with 85 mm bore, 88 mm stroke, 10.7 compression ratio, double overhead cam, variable valve timing/camshaft and four valves per cylinder N52
- Premium unleaded fuel 91
- Fuel economy EPA highway (mpg): 30 and EPA city (mpg): 20
- Multi-point injection fuel system
- 18.5 gallon main premium unleaded fuel tank
- Power: 160 kW , 215 HP SAE @ 6,250 rpm; 185 ft lb , 251 Nm @ 2,750 rpm

Read more: http://www.motortrend.com/cars/2007/bmw/5_series/specifications/index.html#ixzz0neCh6kcI

05-11-2010, 12:03 PM
US spec 525i has the N52B30 (3.0l de-tuned) while other countries get the N52B25 (Which is the 2.5l)

05-11-2010, 12:07 PM
How do you tune the N52B30? :D Got any links? I'm curious as to why there's a different range of power amongst different models that use the same engine. Sorry for the Hijack.


05-11-2010, 12:33 PM
2007 -

The N52KP will be available in three versions as follows:
N52B30O1 - High Output version with 260hp
N52B30M1 - Medium Output version with 230hp
N52B30U1 - Possible future application with 215hp
Each of the above engines will have a different specific output for installation into various
models. For example, the new E83 LCI (X3 3.0si) will receive the O version which has a
power output of 260 horsepower at 6600 RPM

05-11-2010, 12:37 PM
Would it be possible to convert say the U1 version to the O1 or at least M1?


05-12-2010, 05:30 PM
I don't know if you can tune it, hahaha probably not :p
BTW, the US version N52B30 has 20NM more torque than the rest that has the N52B25
I still wonder why the usa got a de-tuned 3.0 and the rest got the 2.5 :confused:

05-12-2010, 05:53 PM
Thanks everybody for the input and your help.

05-12-2010, 06:02 PM
Hey, so was there a bet between you and your friend? :D

05-12-2010, 06:45 PM
No not really a bet. Started as a question from my friend and then my cousin jumped into the conversation and claimed it was the N52B25, and he's just a huge ass hole since he bought his Audi so i became my personal mission to prove him wrong.

05-12-2010, 07:30 PM
Lmfao!!! :d

Ryan M
05-12-2010, 07:34 PM
The higher output engines have DISA, the lower ones do not.

05-15-2010, 06:58 PM
on the front of the engine there should be a label...it will show the engine model. at least mine has it.

05-20-2010, 04:21 PM
Found the sticker you were talking about it says N52B30AE. Not sure what the AE stands for but can seem to find it. Now I'm a lil confused.

05-20-2010, 04:45 PM
AE means the "UL" Lower Output version (525i). AF is the "OL" or upper output stage version (530i).

According to the 6th page of this PDF link:

http://docs.google.com/viewer?a=v&q=cache:aCbGjcC3d1gJ:www.renette.dk/Bil/BMWe90/E90_Powertrain.pdf+bmw+%2B+N52B30+%2B+AE&hl=en&gl=us&pid=bl&srcid=ADGEESjzWOrK_hT5FtTK36JbGCgFrLlFDcGBZzraACZz pnGKfu8kbDJ_s_XXoLpYsqtM5Rfg6u2oSijdodtOM9CSTeixX0 WkNTqmLoSJdydqqRJo5wwKPhz-ENG3gvrJ4E7VQ5IfVXIe&sig=AHIEtbSfWl4Al5ECdftdBEwir9BNUCJidQ