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Old 05-06-2013, 10:50 AM   #1
sx_pete
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Default m50b25 swap Q and A

Reeto
Iím new to bmw world, after driving my compact for a while I feel it could do with more power, so Iíve decided to go turbo with the m50 - but first the engine swap
Before I start it Iíve got a couple of questions that I couldnít find an answer online to

1) Is my V reg (1999) compact obd1 or obd2 (obd2 i think)
2) This is the engine Iím looking at buying will this be obd1 or obd2 (obd1 i think)
http://www.e30zone.net/modules.php?n...topic&t=236417
3) If they are different obd1/2 how hard is it to wire the engine to the car
4) Is there anything else Iíll need that not listed in the sale (clockís ews unit key and chip)


Iíve never done a bmw engine swap before so any advice would be appreciated!
Thanks in advance
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Old 05-06-2013, 11:33 AM   #2
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This has been done many times. Several years ago the best way to get more power out of the S52 was to convert it to OBD1 and tune it.

This article is written about converting an OBD2 S52 (M3) to OBD1, but the same principles would apply in your case. That is an OBD1 engine in OBD2 chassis.

http://forums.bimmerforums.com/forum...what-I-learned
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Old 05-07-2013, 03:18 AM   #3
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Smile 318ti engine swap

I'm new to bmw's but recently acquired a 1998 318ti and I want to do a motor swap. Now I want a 6 cylinder so I'm thinking M52 or S52 (Idk the difference). But also my car is automatic and I want to convert to manual. Now just curious what all parts would I need to make this happen? i.e. Exhaust, headers, flywheel, what transmission. etc. Please take it easy I'm a newbie! I appreciate all help!
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Old 05-07-2013, 04:01 AM   #4
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Quote:
Originally Posted by Snookyfutw View Post
I'm new to bmw's but recently acquired a 1998 318ti and I want to do a motor swap. Now I want a 6 cylinder so I'm thinking M52 or S52 (Idk the difference). But also my car is automatic and I want to convert to manual. Now just curious what all parts would I need to make this happen? i.e. Exhaust, headers, flywheel, what transmission. etc. Please take it easy I'm a newbie! I appreciate all help!
Honestly,,, you need to spend a few nights reading the forum and searching.. There is a massive amount of information on here about what you want to do.. Its an endless topic of conversation...


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Old 05-07-2013, 04:29 AM   #5
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Smile

Thank you. I'll hop to it!
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Old 05-07-2013, 05:45 AM   #6
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BTW,, the difference between the M52 and S52 is horsepower... and overall strength. THe S52 is the eM3 engine..
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Old 05-07-2013, 08:35 PM   #7
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would i be better off getting a obd2 m52b28 if so what years (trying to keep the wiring as simple as i can)

Last edited by sx_pete; 05-07-2013 at 08:39 PM.
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Old 05-07-2013, 10:15 PM   #8
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Unhappy

Thanks. My biggest question is what engine would be best for my 318ti? Along with the manual transmission conversion? I'm not trying to spend a ridiculous amount of money. Also what does the old or what ever it's called mean?? Sorry like I said I'm new to bmw's and haven't found much so far to elaborate on these things.
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Old 05-08-2013, 02:17 AM   #9
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Quote:
Originally Posted by sx_pete View Post
would i be better off getting a obd2 m52b28 if so what years (trying to keep the wiring as simple as i can)
Short answer - absolutely!
I suggest you look around the engine swap section. This subject has been discussed in great length and all the information you need to answer your question is there.
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Old 05-08-2013, 03:00 AM   #10
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What does OBD1 and OBD2 mean? Sorry I'm prolly asking dumb stuff
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Old 05-08-2013, 04:46 AM   #11
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Quote:
Originally Posted by Snookyfutw View Post
What does OBD1 and OBD2 mean? Sorry I'm prolly asking dumb stuff
On Board Diagnostic <revision>

OBD1 was ramped in from the early 90's..
OBDII mandatory in the US from 1996 onward.
OBDIII Currently in deployment in high horsepower to weight vehicles.

In the US to keep the car 100% legal the motor has to be same year or newer as the car chassis.. It is a federal offense, albeit seldom enforced to put a OBDI engine in a OBDII car, and if you sell it, the buyer can jack you up any time they want and get their money back no matter how "as is" the sale is. Its not possible to completely sign away a federal legal requirement.

Not a layer just a guy who's watched enough friends go down in flames in small claims court to be paranoid..



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Old 05-08-2013, 06:11 AM   #12
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Thanks man that was very helpful! Is there any performance difference between an OBD1 and obd2 motor?
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Old 05-08-2013, 10:41 AM   #13
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OBDII mandatory in the US from 1996 onward.



is this the same in the uk
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