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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 doesnt have enough power!!



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      10-18-2012, 03:18 PM   #1
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Arrow 325i doesnt have enough power!!

i have 325i e92 2008 and i feel it must have more power, someone told me that he will upgrade the computer and this will give the car an extra 18 HP, so are 18 hp good and will make a difference ?

and he offered me a package of exhausts, filters , and another thing i cant remember in addition to the computer that will add about 50 hp, he told me that i will get a huge difference, is that right ?
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      10-18-2012, 06:47 PM   #2
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Engine software upgrades won't give you 18hp. 10hp at best. All of those mods combined might give you 20hp which isn't bad but you'll spend a lot of money getting there. I'm guessing since you have a 325i coupe that's it's a 2.5L engine and not the US spec 3.0L. Software will improve throttle response and the rest will mostly make it sound better (depending on what you buy).
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      10-18-2012, 07:18 PM   #3
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Buy a 335 if you wanna go fast.
The 325 sure is good on gas I was getting 31 mpg on the highway in my old 06.
It's a great car but just isn't very fast and nothing you do is going to make much of a difference.
So leave it alone and enjoy the ride, IMO.
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      10-18-2012, 09:23 PM   #4
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I'm fine with my 325i. It has enough power to overtake during my daily commute.
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      10-19-2012, 12:25 AM   #5
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Things to make your 325i go faster:
3 Stage Intake Manifold (from the 330i)
Get a high-flow air filter
High-flow exhaust (perhaps BMW Performance Exhaust)
High-flow catalytic converters or you can cut them out.
Catless Headers (Exhaust Manifold)
DINAN Throttle Body
ECU Tune.... all this [together] will perhaps give you anywhere from 50-60bhp increase but will cost you a pretty penny.
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      10-19-2012, 05:34 AM   #6
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You should be happy you dont have the convertible thats +200kg, the engine will rev and scream and it sound nice but a toyota will probly overtake you
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      10-19-2012, 07:12 AM   #7
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i dont know but i feel i need to put it on DS to feel the power ,,, and all the things i mentioned will cost me about $1450

thank u for ur replays
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      10-19-2012, 08:24 AM   #8
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325i in euro or other markets could be a different engine.
Check that you have a n52 engine or n53

Euro 325i with n52 should come with the DISA intake manifold, so some tunes could bump it to n52 330i / 130i levels

Euro n53 325i will need to swap to 330i n53 intake manifold, and with a tune could make 270hp
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      10-19-2012, 10:09 AM   #9
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Quote:
Originally Posted by andrey_gta View Post
325i in euro or other markets could be a different engine.
Check that you have a n52 engine or n53

Euro 325i with n52 should come with the DISA intake manifold, so some tunes could bump it to n52 330i / 130i levels

Euro n53 325i will need to swap to 330i n53 intake manifold, and with a tune could make 270hp

how to check ?

2.5L ?
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      10-19-2012, 10:18 AM   #10
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Quote:
Originally Posted by anas View Post
how to check ?

2.5L ?
put last 8 or 7 # VIN into www.realoem.com

let us know
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      10-19-2012, 08:14 PM   #11
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[quote=e90pilot;12859542]Engine software upgrades won't give you 18hp. 10hp at best. All of those mods combined might give you 20hp which isn't bad but you'll spend a lot of money getting there. I'm guessing since you have a 325i coupe that's it's a 2.5L engine and not the US spec 3.0L. Software will improve throttle response and the rest will mostly make it sound better (depending on what you buy)

I don't know what engine he has but our stage 2 with manifold swap got a 40+ Hp gain...I didn't Dino but my car is faster than my brothers 330i which has 255 Hp
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      10-19-2012, 08:38 PM   #12
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Quote:
Originally Posted by N0OS3 View Post
Things to make your 325i go faster:
3 Stage Intake Manifold (from the 330i)
Get a high-flow air filter
High-flow exhaust (perhaps BMW Performance Exhaust)
High-flow catalytic converters or you can cut them out.
Catless Headers (Exhaust Manifold)
DINAN Throttle Body
ECU Tune.... all this [together] will perhaps give you anywhere from 50-60bhp increase but will cost you a pretty penny.


Can you explain to me what the catless headers do for the car? As well as what kind is our there for the e90s. Also specific high-flow air filters?

I have a 325i and i got an AFE Intake as well as the BMW PE. I will be getting the 3 stage intake manifold from my sisters car soon.
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      10-20-2012, 06:48 AM   #13
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01/2008 E92 325i Coupe N52N Europe Left hand drive N
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      10-20-2012, 10:03 AM   #14
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shlownik Anas?

Since you are in Jordan. I would imagine labour is cheap and you don't have emission tests. The cheapest way to get more power quickly would be to have a shop cut out all 4 catalytic converters and replace it with straight through piping. That should be good for 20-25 WHP. It will also increase your gas mileage. Your car will be a lot louder and you might not like the sound but you could add additional resonators if you want to keep it quiet. You will need a simulator. Something like the BMS downpipe fix so you don't get a check engine light. An engine tune will also benefit you. Also, don't forget about lighter wheels and tires. Something like apex arc8's would shave a lot of weight at the wheels and make your car faster in corners and in general.
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      10-20-2012, 01:40 PM   #15
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Quote:
Originally Posted by anas View Post
01/2008 E92 325i Coupe N52N Europe Left hand drive N
Sounds like the 2.5L since it's an N52. Your engine has a 2-stage intake manifold already so going to a 3 stage won't yield any benefits. As others have stated, removing the cats tuning the car to run without them would give you the highest gains. 40-50hp seems optomistic though.
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      10-20-2012, 02:44 PM   #16
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sorry but i dont know what is the cats and what is the main function of it ( are they something in the exhaust so it will make the car sounds louder ? ) ,,,, another question will i have any problems or the car will need more service ... if i make any tuning to the car ? or changed the exhausts ?

thanks all
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      10-20-2012, 05:02 PM   #17
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The cats are short for catalytic converter. It's part if your exhaust that helps reduce emissions like carbon monoxide. The downside is it restricts airflow through the exhaust and reduces power. Removing it will increase power but cause a lot of back spot to form up your bumper above your exhaust.
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      10-20-2012, 06:07 PM   #18
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Quote:
Originally Posted by N0OS3 View Post
Things to make your 325i go faster:
3 Stage Intake Manifold (from the 330i)
Get a high-flow air filter
High-flow exhaust (perhaps BMW Performance Exhaust)
High-flow catalytic converters or you can cut them out.
Catless Headers (Exhaust Manifold)
DINAN Throttle Body
ECU Tune.... all this [together] will perhaps give you anywhere from 50-60bhp increase but will cost you a pretty penny.
I hear mix reviews about Dinan's TB, anyone know how beneficial it is to have this?
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      10-22-2012, 12:54 PM   #19
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Quote:
Originally Posted by spacemonkey1112 View Post
I hear mix reviews about Dinan's TB, anyone know how beneficial it is to have this?
reviews are mixed. Someone compared it "breathability" of cutting out the Charcoal filter others have said only top end gain, and one case has said it reduced power ( he had dynos but he also had varying tire size & air pressure).

I guess it is a finishing touch to a Tune where Valvatronic is changed


if you are set on the idea:
Find a used/salvaged TB and send it to maxbore.com , I spoke to him he is able to do it( had one customer in the past)
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"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is
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      11-01-2012, 06:24 AM   #20
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i have seen the mixed reviews on the Dinan TB too but i cant imagine it would be a loss to install it... i would most definitely blame it on some other mod for the loss of power.
i would probably add this if i had absolutely nothing else to do to the engine, short of installing a stroker kit and/or supercharger.

There is a member in the 1er section who retrofit an E36 M3 intake manifold onto his N52 (six individual throttle bodies)... supposedly bumped him up to 315whp and still Naturally Aspirated. :/ this is something i definitely want to do but no installation thread or reviews on the process (either that or i just cant find it)
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      11-01-2012, 10:12 AM   #21
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Quote:
Originally Posted by N0OS3 View Post

There is a member in the 1er section who retrofit an E36 M3 intake manifold onto his N52 (six individual throttle bodies)... supposedly bumped him up to 315whp and still Naturally Aspirated. :/ this is something i definitely want to do but no installation thread or reviews on the process (either that or i just cant find it)
as far as I know that 315hp number is achieved with the following.
Catless headers from south African 330i racer
Race ecu
valvetronic locked at full tilt, to use the e36Itb
custom cams
E87 bmw race spec exhaust
Probably different fuel injection.


So at best we can mimic only exhaust, headers and valvetronic remap via a tune.
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128i Sport 6MT converted to Euro 130i spec, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: e36M lip Wishlist: //M front arm, coils, n55 eng mnt, headers, LSD, e60 finn diff


"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is

Last edited by andrey_gta; 11-01-2012 at 10:22 AM.
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      11-01-2012, 12:36 PM   #22
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interesting... i will look into it more then...
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