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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 > Performance opinions and power gains



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      04-18-2012, 06:14 AM   #1
CleanE30
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Performance opinions and power gains

Hi everyone, I am fairly new to this form. I have recently acquired my 06 325xi Touring. I love the car, but I have to say that the power is a bit on the lacking side, specially with the all-wheel drive system making the car heavier. I would like to think about some options that I have to increase the power, but I also wanted to understand how much truly I can expect from simple bolt-on's and retuning. If I had the choice I would supercharge it, but I don't see any kits available for this engine.

Thank you for your help and your comments.
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      04-18-2012, 09:52 AM   #2
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Im sad to say that they have discontinued/ nor ever made any sort of performance gain items for a 325. I would just trade the car back in, sorry to be the one to carry bad news.
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      04-18-2012, 09:55 AM   #3
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I am fairly new as well, but from what I have read the 3 stage manifold with an tune seems to be fairly significant for a 325. Being in Canada, I don't know what engine you have but I am sure others will.

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      04-18-2012, 10:09 AM   #4
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People say you can't get gains out of the 325i but you can.
AA tune
Simoto or Euro box intake
Exhaust system (I just have a muffler delete and it sounds great w/ no drone)
3 stage manifold
CYBA intake scoops
FLAMES!
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      04-18-2012, 01:02 PM   #5
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let me add another thing, upgrading exhasut on wagon will be a lot louder then sedan, so you might want to pick more milder sounding exhaust if you cant standing loud one.

btw does Canadian 325 come with 3.0 engine?
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      04-18-2012, 05:46 PM   #6
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Sorry guys, yes, it's a 3.0L
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      04-18-2012, 06:04 PM   #7
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The three stage intake manifold from the 330i and an ECU tune from Active Autowerke should get you started. The combination seems to be the best gains per dollar you can get. Ive done it and wished I had done it much sooner.
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      04-18-2012, 06:40 PM   #8
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+1 on the 3 stage intake manifold swap plus ECU tune. You can get a solid + 30 HP with that! Talk to MaximusJ, that guy has taken a 325i pretty far!
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      04-18-2012, 07:41 PM   #9
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I recommend ECU remapping + bmw performance air intake + bmw performance exhaust ( dunno if it's available for the xi) . personally i didn't try the combination yet but i read so many good new about the parts individually and i'm going to apply them on my 330i this summer... if i saved some money :P
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      04-18-2012, 09:11 PM   #10
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I vote Active stage 2 Software
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      04-18-2012, 09:23 PM   #11
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Quote:
Originally Posted by Andrew@ActiveAutowerke View Post
I vote Active stage 2 Software
How about a supercharger system????!!!!????
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      04-18-2012, 09:37 PM   #12
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Haha It may be a possibility in the future.
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      04-18-2012, 11:41 PM   #13
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Quote:
Originally Posted by aantar View Post
I recommend ECU remapping + bmw performance air intake + bmw performance exhaust ( dunno if it's available for the xi) . personally i didn't try the combination yet but i read so many good new about the parts individually and i'm going to apply them on my 330i this summer... if i saved some money :P
Intake and exhaust will give you jack in the HP gain/money ratio. Better off with the 3stage manifold to get any noticable gains! Though if you have the money for the PE go for it, it is a sweet sweet sound!
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      04-19-2012, 05:59 AM   #14
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Thanks for all the replies. Does anyone have actual dyno numbers to prove some of the Intake / Exhaust / Software / Intake Manifold gains???
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      04-19-2012, 08:20 AM   #15
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Quote:
Originally Posted by CleanE30
Thanks for all the replies. Does anyone have actual dyno numbers to prove some of the Intake / Exhaust / Software / Intake Manifold gains???
I don't have pics but I have a short ram intake it added like 3-5 to wheels exhaust adds 5-7 also to wheels AA tune gives you around 15 to wheels and 3 stage manifold gives you 20-25 to wheels with all air restrictions taken off. Right now I'm at 246 whp and 238 wheel torque. I also run a 75 wet shot of nitrous.
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      04-19-2012, 11:28 AM   #16
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Bmachine, got any dynos? From your numbers, you're putting out around 282-290hp at the crank (15-18% drivetrain loss)
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      04-20-2012, 10:19 AM   #17
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yeah everyone would be excited to see a dyno graph of this.....
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      04-20-2012, 12:24 PM   #18
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Exclamation

Quote:
Originally Posted by Bmachine18 View Post
I don't have pics but I have a short ram intake it added like 3-5 to wheels exhaust adds 5-7 also to wheels AA tune gives you around 15 to wheels and 3 stage manifold gives you 20-25 to wheels with all air restrictions taken off. Right now I'm at 246 whp and 238 wheel torque. I also run a 75 wet shot of nitrous.


On Monday you were asking about nitrous in this thread. Then a day later you put the kit up for sale claiming yesterday you made 321 horse power & 318 lbs. of torque in this thread on a dyno.

-Nate
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