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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
 
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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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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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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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  #6  
Old 07-04-2016, 02:37 PM
bashar bashar is offline
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Location: UAE (Emirates)
 
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Posts: 18
Mein Auto: 520i 2002 model
Hi izzath,

I have 520i 2002 and had a problem with the head...I will swap the engine and the gearbox with 525i please let me know if your experience in this was successful

Thanks a lot
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  #7  
Old 07-04-2016, 03:33 PM
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540 Hammer 540 Hammer is offline
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Mein Auto: 1999 BMW 540I
Quote:
Originally Posted by King 5 View Post
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.
I tend to agree with this post. I've been involved with engine swaps over the course of 25+ years, working with high HP cars. They rarely go as planned and always end up being a lot more work and money than you think.

Unless you did a major upgrade, IMO, like to the BMW 4.4L V8, or heaven forbid an: LS1, LS2, LS3, LS6, all aluminum, high performance GM motor, it wouldn't be worth it.

Some are doing this with blown BMW motors, or small displacement inline six motors, or they just want to swap to something with 400-500HP, normally aspirated. Like the stock GM performance motors I listed. They are very light too, keeping the handling of the BMW. Just swapping to a small six, doesn't make a lot of sense, IMO.

You'd be better off finding an older M5, or an E39 with a 4.4L V8, without a ton of miles and selling you car the way it is. That would make the most sense to me.


It's your $$'s, so do what you think would make you happy. Again, there are some sweet deals on older M5's out there!!
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  #8  
Old 07-04-2016, 04:22 PM
bashar bashar is offline
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Mein Auto: 520i 2002 model
Thanks for the reply,

I agree there are a lot of good deals on m5's, I currently do not have the chance to purchase another car so I have to stick for what I have for at least sometime. I pray for a successful engine and gearbox swap
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  #9  
Old 07-05-2016, 09:18 PM
Sroor9001 Sroor9001 is offline
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Location: Bahrain
 
Join Date: May 2014
Posts: 760
Mein Auto: Bmw 525i 2002
Quote:
Originally Posted by bashar View Post
Thanks for the reply,

I agree there are a lot of good deals on m5's, I currently do not have the chance to purchase another car so I have to stick for what I have for at least sometime. I pray for a successful engine and gearbox swap
It should be direct swap even 525,528,530 but only engine no need to change gearbox on the same ignition system but you have to tune later to get remaining horse power or change ecu and ews and the key later if you are not on hurry
Good luck
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  #10  
Old 07-07-2016, 02:20 AM
bashar bashar is offline
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Location: UAE (Emirates)
 
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Mein Auto: 520i 2002 model
thanks,
actually I have to change the gearbox because it had been damaged after the repair shop changed the engine to 320I,
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