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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-01-2011, 03:24 PM   #1
jeffrey325i
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2.5-3.0 swap FI

I searched and couldn't find where anyone has done diy thread on a 3.0 swap into a 325. What i'm planning on doing is buying a blown up/tired 3.0, and doing h-beam rods, dished pistons, headwork and cams in it. I read where the 323 or 328 has a cable operated throttle, whereas the 2.5 and 3.o have the drive-by-wire. I am wondering if i will have any computer/ wiring issues. I believe the only difference is the crank btween the 2.5 and 3.0, but I'm still learning so i dont want to invest in a 3.0 and not be able to do this.

I also would like to know where you guys are buying the internals for these motors, i dabble in turbo/superchargers for small block chevys but have never have done a M54. Like i said, i will need a whole rotating assembley, gonna put alot of boost and possibly a little spray. And cams, and i will clean up the casting if need be in the head, probably valves also if anyone offers a larger size.

I know, I know....Why don't you just save up for an M3???? thats simple, I have sedan where i want it cosmetically and I know what I have. I really want a HPF M3, but that just isn't logical for me being 20 and I have a sedan that's paid for.

Any input is much appreciated guys!
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Old 01-01-2011, 04:37 PM   #2
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dude personally i think your all messed up here. How many miles and what year is your 325? i think it wont be worth dittity squat to do this whole thing, your starting in the wrong direction... dont worry about a 330 if your going FI. just FI your 325 and thats it. theres so much xtra money that needs to be stored away for Fi let alone doing a partial internal swap to a negligible engine size compared to yours. your only practital optiones is to sell your 325 and buy a 330 or FI your 325 everything else is just going to be a big headache.
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Old 01-01-2011, 06:00 PM   #3
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Just put a Supercharger kit on the 325.

You'll need at least $10k to build the engine the way you are talking, and that's on the cheap. My last complete M54B30 engine build was more than double that.
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Old 01-02-2011, 01:20 AM   #4
jeffrey325i
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thanks guys, i had no idea these were that expensive to build, like i said i'm used to small block chevy's(super cheap to make hp with), i think the SC and a set of headers will probably do plenty for the car then. It has 90k on the car and motor. I just wanted a little more than just a FI325i, but if they are that much, then there is no point at all . That was the feedback i was lookin for guys, i really appreciate the honesty. Maybe a HPF or AA M3 maybe in the future, just no time soon. Do you all think to stock cluch, in the long term, is able to handle that SC kit or should i look into getting an aftermarket one, and if so, any suggestions?
Thanks guys
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Old 01-03-2011, 12:07 AM   #5
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good luck brawski and remember the search bar is your wallets best friend
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Old 01-03-2011, 08:07 PM   #6
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If you looking for some extra umph that's affordable look into a diff swap. Seeing as there's really no need to being going over 100mph on the regular, swapping diffs to a higher gear really helps our cars 0-60. For 5spd 325's just get a diff out of an Automatic which is geared at 3.46. It bolts right in, no need to change input flanges either. Best performance mod I've done along with an Understeer short shifter. Pulleys/intake/exhaust, didn't feel a damn thing, but got them cheap and sounded better. But diff, instant results on the butt dyno.
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Old 01-04-2011, 04:20 PM   #7
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okay, i hadn't really given the gear change a second thought really, but i dont ever go over 100 like you said. I dont want to sound like a noob but I am: Are the auto diffs just as strong as the manuals? I imagine they are just geared differently because the auto and man. have different final gear ratios? I am planning on doing a SC kit so that is one of my concerns is the durability when you start addin HP's.
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Old 01-04-2011, 06:55 PM   #8
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Auto diffs are no different then manual, except for the gearing.

http://www.bokchoys.com/differential/GearRatios.htm
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Old 01-08-2011, 07:03 AM   #9
jeffrey325i
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oay thanks man, im going to look into getting a diff for an auto, thanks again
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Old 01-12-2011, 09:24 PM   #10
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Your stock clutch will be fine with an aftermarket SC kit. If you still have CDV, remove it immediately.

Better upgrade your diff if you want to use some of the power wisely, Quaife is your cheapest and most reliable bet.
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Old 01-18-2011, 06:01 PM   #11
jeffrey325i
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thanks bro, that cdv delete is on the list of mods to do. If i can ever get these bumpers back from the paint shop On project at a time I have learened that the hard way
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