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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > 325i conversion to 330i



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      05-31-2011, 05:22 PM   #1
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325i conversion to 330i

I'm going to make my car as close to a 330i as possible. I'm going to install a stage 3 intake manifold and sofar these are the parts that I know I need:
11617559523 Intake Manifold
11617559530 Vent Hose
11617579114 Adjustor Unit
11617560538 Adjustor Unit 2
11617547242 Gasket set
11617535849 x5 Screw 50x20
11617535850 x2 Screw 50x35
11617535851 x1 Screw 50x66

Anything else that I need like a new air intake? And are there any websites that I can get these parts for less? So far it costs just under a grand. The software I'm going to get done in a shop that only works on bmw's.
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Last edited by gunnerxq; 06-01-2011 at 06:45 PM.
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      05-31-2011, 10:33 PM   #2
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There's a PCV line in the back if the valve cover the breakes easily. I forgot the part number exactly. It costs around $80, I think.
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      06-01-2011, 12:10 AM   #3
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Quote:
Originally Posted by e90pilot View Post
There's a PCV line in the back if the valve cover the breakes easily. I forgot the part number exactly. It costs around $80, I think.
Yea heard about it hopefully I don't break it
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      06-01-2011, 07:59 AM   #4
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If you want to make your 325i similar to a 330i, you'll also have to get the 330i's exhaust as it's less restrictive and 330i's brakes as they are larger (rotors). Everything else is pretty much the same.
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      06-01-2011, 09:05 AM   #5
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Quote:
Originally Posted by IB6UB9ok View Post
If you want to make your 325i similar to a 330i, you'll also have to get the 330i's exhaust as it's less restrictive and 330i's brakes as they are larger (rotors). Everything else is pretty much the same.
I put on a Remus exhaust is that close to a 330i exhaust
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      06-01-2011, 11:06 AM   #6
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sell your 325i and buy a 330i. You'll different car and 330i performance
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      06-01-2011, 11:10 AM   #7
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sell your 325i and buy a 330i. You'll different car and 330i performance
That would be true if he was trying to go from 325 to 335 but the conversion from a 325 to 330 is pretty cheap. All you really need is a better exhaust (like BMW perfromance), the intake mainfold, and the AA tune is highly suggested too. The 325, 328, and 330 all have the same exact engine, just a different tune and the 330 has a 3 stage intake manifold.
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      06-01-2011, 06:42 PM   #8
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Is this all I need? I want to order the parts as soon as possible.
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      06-01-2011, 09:30 PM   #9
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if that is the same list that is in the other thread, then yes, that is all you need, though you should be able to re-use your vent hose if you are carefull. There is a lot of info in the other 2 threads regarding this, so make sure you read them.
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      06-01-2011, 10:10 PM   #10
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Quote:
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if that is the same list that is in the other thread, then yes, that is all you need, though you should be able to re-use your vent hose if you are carefull. There is a lot of info in the other 2 threads regarding this, so make sure you read them.
Ok so no vent hose that saves me 120 bucks.
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      06-02-2011, 12:35 AM   #11
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To be very honest with you, I really don't know. Having said that, I assume any aftermarket exhaust would be more free-flowing than a factory installed exhaust.

Keep us posted on this.

Wil

Quote:
Originally Posted by gunnerxq View Post
I put on a Remus exhaust is that close to a 330i exhaust
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      06-02-2011, 06:49 AM   #12
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Within 2 or 3 weeks I should have these parts..... Is it true that the 325i ecu adjusts by itself? I read some posts that after awhile it will adjust by itself and doesn't need a 330i reflash.
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      06-02-2011, 12:55 PM   #13
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you will gain power with just the manifold, but there is a flat spot/dip in the midrange for about 500 rpms or so, and the power still falls off on the top end (you'll still pick up ~15hp and a bunch of torque though). The AA flash is needed to smooth out the powerband and give you an additional 10-15 hp over stock 325i computer.
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      06-02-2011, 03:20 PM   #14
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Quote:
Originally Posted by mike-y View Post
you will gain power with just the manifold, but there is a flat spot/dip in the midrange for about 500 rpms or so, and the power still falls off on the top end (you'll still pick up ~15hp and a bunch of torque though). The AA flash is needed to smooth out the powerband and give you an additional 10-15 hp over stock 325i computer.

I have a 328i, Is it really possible to pick up over 20hp with the 3 stage intake and AA tune?
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      06-02-2011, 03:23 PM   #15
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Has anyone tried this with a '28 yet? I know the '25 works but it can be That much different from a '28.
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      06-02-2011, 03:25 PM   #16
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Quote:
Originally Posted by gunnerxq View Post
Within 2 or 3 weeks I should have these parts..... Is it true that the 325i ecu adjusts by itself? I read some posts that after awhile it will adjust by itself and doesn't need a 330i reflash.
It does not adjust. I don't think it's harmful but I do think it's slower than stock without the tune.
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      06-02-2011, 08:25 PM   #17
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Quote:
Originally Posted by mike-y View Post
you will gain power with just the manifold, but there is a flat spot/dip in the midrange for about 500 rpms or so, and the power still falls off on the top end (you'll still pick up ~15hp and a bunch of torque though). The AA flash is needed to smooth out the powerband and give you an additional 10-15 hp over stock 325i computer.
Thanks definitely getting that AA flash. On another note it should have faster 0-60 times than a 330i with the same about of HP because of the more aggressive gearing right?
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      06-03-2011, 11:14 AM   #18
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hi there... i have a e90 325xi (USA) model.... and i live in Faroe Islands (in the middle of the Atlantic ocean) i had the same dream as you. make my car faster, first i bought the AFE intake. i though DAMN. it sounded good but there was no more power, and after a while i though the car was even slower... but i never changed it back... the i decided to buy the 3 stage intake manifold. and then the car got even sower than before it must be that i need the tune to get it fast... but its no easy for me, because of where i live...
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      06-04-2011, 06:42 PM   #19
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Sweet. I am really doing this on my Girlfriends car!
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      06-04-2011, 10:58 PM   #20
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Quote:
Originally Posted by Delta0311 View Post
The 325, 328, and 330 all have the same exact engine, just a different tune and the 330 has a 3 stage intake manifold.
Why does everyone keep saying this? The 325 has smaller bore sizes than the 328/330.

However, the 328 should be able to make satisfactory gains by adding the "the variable resonance system, dual plenum intake runner system, and the variable back pressure muffler" found on the higher output versions.

So we should find those part #'s & add them, then try flashing a stock 330 firmware file... right?
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      06-04-2011, 11:50 PM   #21
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Quote:
Originally Posted by gunnerxq View Post
Is this all I need? I want to order the parts as soon as possible.
no, this is how the 330 performs "variable exhaust" even if the performance exhaust is installed. it's a vacuum control flap.



it looks as though the intake parts you listed take care of the "variable resonance" and "dual plenum manifold" portion.

but on a 325 it won't be exact because the displacement is off.

this *seems* obtainable on a 328 with the addition of these parts and a firmware change to 330.
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      06-05-2011, 01:01 AM   #22
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Quote:
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Why does everyone keep saying this? The 325 has smaller bore sizes than the 328/330.
Then why do the short blocks have the same part number? Where'd you get your info?
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