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Old 10-15-2013, 11:06 AM   #1
want2bboosted
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Need more power lol need input on mods/turbo for my 325ci

Ok So long story short, I been building my cars to 500-550whp whether its awd or rwd. But they are old school 74 datsun, talon, supra etc and I always wanted a bmw so I took the plunge but todays is my 3rd day of owning it and just need more power lol

To be fair I knew it be slow when I got it but thats where my skills can be put to work lol

on the up note I must say Im loving the car itself, never realized how fun this car is and Im hook. I doubt ill ever go back lol


So back on topic.

I have a 2001 325ci coupe. Power goal 500whp if can be done in cheaply. or 400whp on stock engine.

This is my first BMW and not too sure how to go about it.
I figured I post and see if Im heading in the right direction first before I do extensive research on certain mods. (I did a quick search)

Im pretty handy with welding machine and a cutting/angle grinder so building the turbo setup/IC mounting is a piece of cake(I build quite a few already and its all the same)


Info I need is the bmw specific.

Before anyone say just buy m3 etc No thanks, its not going to be fast enough. e46 M3 are still in the 15k-25k range. I got this car for 3.5k lol Id much rather spend 10k in mods and have way faster car than stock.

SO here goes. Ill start with getting the power down then power.

Differential: seeing stock is not an lsd only option is m3 (cheaper than other custom)

what ill need: from m3
driveshaft
diff
subframe
axles
sway bar

transmission: Id like to keep 5 speed due to cost). anyone know the breaking limit of stock 5 speed?

m3 6speed: Does this bolt up on a m54b25?

-then ofcourse clutch:


engine: s54 is out of the question. initial cost for the engine isnt worth the trouble of the swap imo for my application and goal.

that means my option are the m54 either 3.0 or 2.5

Im leaning towards 2.5 since its what i have, but if 3.0 is straight swap then that might just be an option. for now im still doing searches.



TUNE: well this is were It gets complicated - atleast thats what it said all over the threads that i found. Certainly not tuner friendly. so I would have to make sure I found a tuner localy first here in bay area california.


thats all for now please put in input if you can. thanks
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Old 10-15-2013, 11:28 AM   #2
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lol wut?

Turbo or supercharger. Get your rear subframe reinforced. Good luck.
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Old 10-15-2013, 11:34 AM   #3
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Need more power lol need input on mods/turbo for my 325ci

Stock 325. Wants 500hp out of it.
Sorry but you can't have that.
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Old 10-15-2013, 11:35 AM   #4
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Need more power lol need input on mods/turbo for my 325ci

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Originally Posted by peytonracer4 View Post
Stock 325. Wants 500hp out of it.
Sorry but you can't have that.
You'll see 350 MAYBE with about $15000 worth of work.
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Old 10-15-2013, 11:45 AM   #5
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What you want is not feasible, especially if you want to do it cheaply. Look at the FI section.
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Old 10-15-2013, 11:50 AM   #6
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Need more NOS
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Old 10-15-2013, 11:51 AM   #7
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throw an LS1 in there if you want that kind of power, because your not gonna get it from a 325. and careful with that subframe.
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Old 10-15-2013, 02:13 PM   #8
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http://www.bimmerboost.com/showthrea...o-make-a-357ci
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Old 10-15-2013, 02:24 PM   #9
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It could be done but it would cost around the same to get the same power out of an M3. Again, like everyone else is saying, watch the rear subframe with all the HP and TQ you're gonna be putting down.
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Old 10-15-2013, 02:25 PM   #10
want2bboosted
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Quote:
Originally Posted by peytonracer4 View Post
You'll see 350 MAYBE with about $15000 worth of work.
say who? where are you guys getting your numbers from?

http://forum.e46fanatics.com/showthr...=793199&page=6

check out that thread. granted he has a 3.0 but close enough. he was pushing OVER 400whp on STOCK ENGINE.

besides thicker HG piston rods studs is what i would guess i need done to the engine. not very much.


and I do ALL work on my car so ITS only parts cost. 15k worth of parts is a bit extensive. im looking at around 5-7k will be plenty.

Last edited by want2bboosted; 10-15-2013 at 02:26 PM.
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Old 10-15-2013, 02:26 PM   #11
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Quote:
I have a 2001 325ci coupe. Power goal 500whp if can be done in cheaply. or 400whp on stock engine.
lol

Quote:
that means my option are the m54 either 3.0 or 2.5

Im leaning towards 2.5 since its what i have
LOL!

Quote:
TUNE: well this is were It gets complicated
LOLOLOLOLOL!!!! THIS is where its gets complicated?

The above was more just teasing. The truth is, I dont have a freaking clue man. If you figure something out, let me know so I can replicate it, make kits and a sh*t ton of money.

Either way, good luck and nothing is impossible really.
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Old 10-15-2013, 02:51 PM   #12
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Old 10-15-2013, 02:51 PM   #13
want2bboosted
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Quote:
Originally Posted by JohnnyJTown View Post
lol



LOL!



LOLOLOLOLOL!!!! THIS is where its gets complicated?

The above was more just teasing. The truth is, I dont have a freaking clue man. If you figure something out, let me know so I can replicate it, make kits and a sh*t ton of money.

Either way, good luck and nothing is impossible really.
I don't get it....

From what I've read tuning is the one thing that has to be sorted out from the start. I'd imagine standalone may be the way to go. Just haven't done full search on tuning stock ecu.

And Yes dude that's where it gets complicated. Ever built a turbo kit? All mechanical are easy stuff. It's the electronic that gets complicated. Think about it plumbing is all the same ****. All components are the same ****. Supporting mods is all the same ****. I'm not exactly reinventing anything here.

Tuning however is more car specific. Some have plug in ecu some you can just flash etc

Last edited by want2bboosted; 10-15-2013 at 02:55 PM.
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Old 10-15-2013, 02:54 PM   #14
want2bboosted
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What you want is not feasible, especially if you want to do it cheaply. Look at the FI section.
Turbo is the plan lol so I still don't get why people are laughing?

My dsm had a tiny 2.0 4 banger and got 530awhp.

So am I missing something here?
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Old 10-15-2013, 02:57 PM   #15
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Originally Posted by want2bboosted View Post
I don't get it....

From what I've read tuning is the one thing that has to be sorted out. I'd imagine standalone may be the way to go. Just haven't done full search on tuning stock ecu.

And Yes dude that's where it gets complicated. Ever built a turbo kit? All mechanical are easy stuff. It's the electronic that gets complicated. Think about it plumbing is all the same ****. All components are the same ****. Supporting mods is all the same ****. I'm not exactly reinventing anything here.

Tuning however is more car specific. Some have plug in ecu some you can just flash etc
I was just having a bit of fun. I really dont know. It would be nice to find something that emulates the computer, so you can just drop a V8 in that bad boy and still pass emissions.

I know what you want can be done, but 500whp and budget dont go together.

You should read the stickies under this general forum, specifically dealing with the vanos, and tightening the wire connections. it might make your car peppy enough to put up with...

I dont know what people need 500hp for, but its your car, hope you get it where you want it.
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Old 10-15-2013, 03:24 PM   #16
want2bboosted
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Originally Posted by JohnnyJTown View Post
I was just having a bit of fun. I really dont know. It would be nice to find something that emulates the computer, so you can just drop a V8 in that bad boy and still pass emissions.

I know what you want can be done, but 500whp and budget dont go together.

You should read the stickies under this general forum, specifically dealing with the vanos, and tightening the wire connections. it might make your car peppy enough to put up with...

I dont know what people need 500hp for, but its your car, hope you get it where you want it.

Well i say it can be done on a budget. Aside from tuning I don't see anything that requires major cash. What I had in mind is custom exhaust manifold 44mm or 38mm external match with hx40. 3" exhaust all the way back.

Now pricing that's a total of 1k Max and that's the whole hot side.

Ebay fmic 2.5 or maybe 3" piping w/bov 500 max

Injectors, regulator 255. Maybe 1k

That makes 2.5k plus 500 for other little bits.

3k


Thats not including clutch and rear drive terrain.

I'd imagine to build this engine with thicker hg studs. Piston and rods shouldn't cost more than 2k in parts.

But if stock 3.0 can get 400whp I don't see why this can't.


At 500whp I'd imagine a basic engine build is in order.

Btw fuel won't be an issue as I can run meth or pump e85 if I have to. But prefers 91 with meth.

As I said before this plan seems to make the power I need and still be cheaper than an m3. Like way cheaper.



And I'm restating this.

I'm posting to find things that could potentially be a big problem. Some things don't come up when you research. Some knowledge are only found when ask or after owning it awhile.

Example is the subframe. Although I found that issues when I was looking at m3 rear swap.


Thanks for the input
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Old 10-15-2013, 03:30 PM   #17
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Ask in the FI section or have a mod move this thread there. They will know more.
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Old 10-15-2013, 03:49 PM   #18
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Old 10-15-2013, 04:08 PM   #19
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Definitely isnt easy, but check out this thread.
http://forum.e46fanatics.com/showthread.php?t=993935

OP on that thread is obviously very experienced with that stuff, but built a beast out of a stock 2.5L running 20 psi. IIRC his main challenges were custom tuning, not actually piecing together a kit - I think he had experience with that. Maybe he will give you some guidance.

Most of these threads in General go nowhere, but GL.
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Old 10-15-2013, 04:17 PM   #20
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you've got too much lackbof turbos and not enough odd shape
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