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Go Back   E46Fanatics > E46 BMW > E46 Xi Forum

E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 02-01-2013, 01:24 PM   #1
xDLXSFx
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Expert on Engine Replacement.

My 2002 325xi engine is **** n' shot and not worth rebuilding; going to get an engine replacement, which a shop is roughly charging me about $4500 for used engine and labor. That being said, since Im spending this much, I know the 330xi engine is the SAME, and need to know roughly what it takes to swap in a 325xi! I called some place the works on BMW's and he said you're better off just buying a 330xi! Quoting me at like $10k for the job! Wtf?

I have done some research on it, but only found on 325i with 330i engine swap - there a difference with Xi? People were saying, just use old intake manifold, throttle body, and intake boot and the rest is plug and play! No sensors will be thrown, etc. Has anyone done this with an Xi or know anyone that has?! Really, really contemplating going for it.. I mean, why the hell not?!
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Old 02-01-2013, 01:32 PM   #2
Kubica
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Parts are same as 325->330 swap.
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Old 02-01-2013, 01:45 PM   #3
xDLXSFx
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Parts are same as 325->330 swap.

Appreciate the info, but very vague. Ive done quite a bit of reading on it, and cant pinpoint definitive answers. Any BMW Mechanics on here???
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Old 02-01-2013, 02:19 PM   #4
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Wow, this is nuts. Called several places - none have the same answer! EuroTech in Minneapolis; yea just need to flash the ECU if doing that. Imola Sports; its pretty extensive with wiring and all that. Called BMRParts to see what they said; yea, you have to swap trannys too otherwise it wont hold up. Really?! No one has the same answer...
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Old 02-01-2013, 02:27 PM   #5
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Yeah man I for a quote of 5k just for labor on a simple engine swap. -_-
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Old 02-01-2013, 02:29 PM   #6
e46alfonso
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The engine will cost you 2 grand. Rent an engine hoist and do it yourself.
BTW it doesn't have to be a 330xi engine, it can be from a 330i or a 530i. The tranny is the same between 325 and 330.
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Old 02-01-2013, 02:42 PM   #7
xDLXSFx
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Yeah man I for a quote of 5k just for labor on a simple engine swap. -_-
Yea its nuts; I keep getting different quotes and answers. Some think its simple, some think its more work than originally thought. Gonna really have to research before considering, not gonna get stuck halfway through the swap and NOT being able to pay for it!

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Originally Posted by e46alfonso View Post
The engine will cost you 2 grand. Rent an engine hoist and do it yourself.
BTW it doesn't have to be a 330xi engine, it can be from a 330i or a 530i. The tranny is the same between 325 and 330.
If I had the 'right' tools I would! Need to remove tranny and re-tighten clutch, etc. Tools that I dont have. I know the engines arent based off of models, I just didnt know the engine code - its M54B25 and I want the B30! Im just banging my head with research and calling around; a lot more trouble than I anticipated. Just all these forums I read on it made it seem, 'simple' to put it lightly.
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Old 02-01-2013, 03:04 PM   #8
GCoop
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Originally Posted by xDLXSFx View Post
My 2002 325xi engine is **** n' shot and not worth rebuilding; going to get an engine replacement, which a shop is roughly charging me about $4500 for used engine and labor. That being said, since Im spending this much, I know the 330xi engine is the SAME, and need to know roughly what it takes to swap in a 325xi! I called some place the works on BMW's and he said you're better off just buying a 330xi! Quoting me at like $10k for the job! Wtf?

I have done some research on it, but only found on 325i with 330i engine swap - there a difference with Xi? People were saying, just use old intake manifold, throttle body, and intake boot and the rest is plug and play! No sensors will be thrown, etc. Has anyone done this with an Xi or know anyone that has?! Really, really contemplating going for it.. I mean, why the hell not?!
Might we inquire as to the origin of the 325 engine's demise?
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Old 02-01-2013, 03:09 PM   #9
xDLXSFx
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Might we inquire as to the origin of the 325 engine's demise?
Haha not at all. Long story short, I was retarded and bought the BMW from a dude in PA - turned out he rarely changed the oil, hence the low price. Driving back, the oil pick-up got clogged, starved the cams, and SNAP! Exhaust cam snapped in half. That was a fun trip...
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Old 02-01-2013, 03:10 PM   #10
e46alfonso
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Don't throw your money away on incompetent mechanics. Buy a beater to get around with and do the swap yourself.
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Old 02-01-2013, 03:13 PM   #11
xDLXSFx
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Don't throw your money away on incompetent mechanics. Buy a beater to get around with and do the swap yourself.
Dude, I really would. But I would be spending more money probably on just the tools to get the job done! Especially with BMW's, always need those specialty tools. I honestly dont think Im THAT mechanically inclined to do that.
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Old 02-01-2013, 03:14 PM   #12
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Keep the info coming people! All appreciated!
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Old 02-01-2013, 03:31 PM   #13
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Originally Posted by xDLXSFx View Post
Dude, I really would. But I would be spending more money probably on just the tools to get the job done! Especially with BMW's, always need those specialty tools. I honestly dont think Im THAT mechanically inclined to do that.
First of all, the tools required to do an engine swap is a simple $100 set of tools from Sears, there's nothing all that special about it. Only thing you might need is a tool required to align the clutch to the transmission, but those tools aren't expensive. I'm not sure, out of ignorance, what the tools required to mate an autotragic trans to the engine are.

Only differences between the 330 engine and the 325 engine are the intake manifold, the MAF, and the ECU software. Other than that, it's plug and play with everything.

Here's the simplified version of how I'd go about doing it:
1.) Drain oil, coolant, and trans fluid out.
2.) Drop the trans out the bottom.
3.) Unplug and disconnect all hoses, accessories (alternator, PS pump, AC compressor, etc), and wiring from the engine.
4.) Disconnect engine mounts and lift the sucker out.
5.) Reverse steps to reinstall.

It is a lot of work and isn't quite as easy as I made it out to be, but it's not difficult. Just tedious.

If you don't want to do it yourself, just buy a 330i engine and give it to the shop to swap. Tell them it's a 325i, they look the same.
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Old 02-01-2013, 03:54 PM   #14
Kubica
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Ummmm...like I said the parts to swap in a 330xi motor into a 325xi are exactly the same as you need to swap a 330i motor into a 325i. Plenty of info available on this site.

Sam- you forgot to mention that the passenger side axle needs to come out and front diff unbolted from the oil pan.

Quote:
Originally Posted by e46alfonso View Post
The engine will cost you 2 grand. Rent an engine hoist and do it yourself.
BTW it doesn't have to be a 330xi engine, it can be from a 330i or a 530i. The tranny is the same between 325 and 330.
Everything above the oil pan is the same. Oil pan/pump are different to RWD bimmers. OP would be smart to source a 330xi motor with the same DME as his car has now.
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Old 02-01-2013, 04:41 PM   #15
SamDoe1
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Sam- you forgot to mention that the passenger side axle needs to come out and front diff unbolted from the oil pan.

Everything above the oil pan is the same. Oil pan/pump are different to RWD bimmers. OP would be smart to source a 330xi motor with the same DME as his car has now.
I'm sure I also didn't mention many, many other things that need to come off. Like I said, I gave the abridged version of an engine swap.

Also, no need to source an Xi motor. Just take the oil pan/pump off the engine that's fvcked up and swap it over. Make sure to give it a good cleaning. You may run into DME troubles, but those can be programmed over relatively easily.

Last edited by SamDoe1; 02-01-2013 at 04:42 PM.
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Old 02-01-2013, 04:45 PM   #16
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how would the 325i ecu deal with the increased displacement/larger maf?
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Old 02-01-2013, 05:12 PM   #17
e46alfonso
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Originally Posted by Kubica View Post
Everything above the oil pan is the same. Oil pan/pump are different to RWD bimmers. OP would be smart to source a 330xi motor with the same DME as his car has now.
Oil pump is the same. He just has to swap the oil suction pipe and pan and loctite&wire the OPN.
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Old 02-01-2013, 05:24 PM   #18
xDLXSFx
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Wow. Thanks for pitching in guys!

Quote:
Originally Posted by SamDoe1 View Post
I'm sure I also didn't mention many, many other things that need to come off. Like I said, I gave the abridged version of an engine swap.

Also, no need to source an Xi motor. Just take the oil pan/pump off the engine that's fvcked up and swap it over. Make sure to give it a good cleaning. You may run into DME troubles, but those can be programmed over relatively easily.
Yes. I found on this forum a guy that swapped a 330i into a 323 or 328i and said basically same thing - to use old oil pan, old intake manifold, old throttle body, old MAF, and flash the ECU. But now I cant find it! Damn...

Quote:
Originally Posted by redbull 325is View Post
how would the 325i ecu deal with the increased displacement/larger maf?
I read that if you use 330 injectors and 330 MAF, to flash the original ECU with a 330i.


Here is a forum I recently found (http://www.e46fanatics.com/forum/sho...=705252&page=2). Seems like mujjuman has done it himself! Lets see if I cant get a hold of this fella...
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Old 02-02-2013, 02:57 PM   #19
SamDoe1
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Originally Posted by xDLXSFx View Post
Yes. I found on this forum a guy that swapped a 330i into a 323 or 328i and said basically same thing - to use old oil pan, old intake manifold, old throttle body, old MAF, and flash the ECU. But now I cant find it! Damn...
I'm 100% sure that the 330 intake and MAF are different and am 75% sure the throttle body is different too.
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