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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 03-10-2014, 08:39 PM
izzath izzath is offline
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Location: Sri Lanka
 
Join Date: Jan 2013
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Mein Auto: BMW E39 520i
Engine Upgrade from E39 520i to 525i

Hi Guys!!

I wanted to convert my E39 520i 1999 to E39 525i,
The reason to convert is my existing Engine Blog damaged due to over heat!
I have bought a 525i 1998 Engine with gear Box and the ECU with the Wire Harness , The engineers having problems with ECU!

Please advice me on these!
1 - Is it possible to convert?
2 - What are the technical Issues?

Looking forward some good helps please!!

Cheers
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  #2  
Old 03-10-2014, 08:56 PM
dckr dckr is offline
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Location: MPLS
 
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Posts: 153
Mein Auto: 99 540i Sport Dinan
never done it, but from what I understand you'll need to pull dme, ews and lock cylinders for ignition and put them in you 520. you'll need to use the key from the 525 to start the 520, and you should re-code the 520.

you may get a mileage tamper light

that's about all I know. some people have had success with opening the dme and messing with the eeprom to avoid the extra hassles of dealing with ews. search around a bit for info on coding
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  #3  
Old 03-10-2014, 09:00 PM
dckr dckr is offline
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Mein Auto: 99 540i Sport Dinan
just though of this: if the 520 and 525 use the same model number dme, programming the 520 dme with daten files for 525 should work
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  #4  
Old 03-11-2014, 10:34 AM
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King 5 King 5 is offline
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Mein Auto: 1997 BMW 528i
From all the engine swap posts that I've read on this forum the consensus seems to be that most swaps aren't worth the money or time. Better off just buying a car with the bigger engine in it.
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  #5  
Old 03-12-2014, 07:44 AM
rdl rdl is offline
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Location: Ontario, Canada
 
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Mein Auto: 530i 2003
Quote:
Originally Posted by izzath View Post
...
I wanted to convert my E39 520i 1999 to E39 525i,
...
I have bought a 525i 1998 Engine with gear Box and the ECU with the Wire Harness , The engineers having problems with ECU!

Please advice me on these!
1 - Is it possible to convert?
2 - What are the technical Issues?

...
What are the problems?

People have swapped engines and written threads describing the changes needed. The issues depend on the swap from what to what: engine, chassis & body with build dates of each. The point being that so many modules in the car talk to one another over the various bus systems. Modules and programming have evolved over the E39 lifespan and one must ensure they are compatible.

If it is a no start issue, post #18 in this thread may help.
http://forums.bimmerforums.com/forum...2#post27416142

If something else, you need to describe it.
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RDL
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