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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 04-19-2005, 02:41 PM
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Street performance upgrade recommendations for 325i?

Ok, what I'm looking for is something to make my 325 a little snappier on the street. I'm not looking to win races and I'm not looking for a complete tuner overhaul. What I want to know is, has anyone done any simple modifications to their 325's to give them a little more oomph but which won't violate the warranty, tear up the engine, etc...

I'm not looking for specific DIY info here, just some opinions on what some people have done to their cars.

Thanks,

Jaydoc
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  #2  
Old 04-19-2005, 05:16 PM
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I've been thinking along similar lines and my route will be: Cold Air Intake, Shark Injector, Aftermarket Exhaust, thicker front swaybar, and maybe a strut brace.

Emanuel
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  #3  
Old 04-19-2005, 06:17 PM
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This subject has been discussed *at length* here many times before.... these cars are very expensive to improve upon. A 25 or 30 HP increase could cost a couple of thousand dollars. Trading up to an M3 is always an option....

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Bob
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  #4  
Old 04-19-2005, 06:51 PM
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Heck, trading up to a 330i would be cheaper and get those gains.

Emanuel
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  #5  
Old 04-19-2005, 10:51 PM
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Yeah, trading up to a 330 or M3 are options, just not options for me right now. Planning on an M5 in a couple years. So I was just curious if anyone had had any luck with upgrades like the Dinan S2 package or if the gains in the 325 were minimal.

Jaydoc
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  #6  
Old 04-19-2005, 11:05 PM
Stuka Stuka is offline
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Quote:
Originally Posted by jaydoc1
Ok, what I'm looking for is something to make my 325 a little snappier on the street. I'm not looking to win races and I'm not looking for a complete tuner overhaul. What I want to know is, has anyone done any simple modifications to their 325's to give them a little more oomph but which won't violate the warranty, tear up the engine, etc...
Fahreschule.

I can easily hang with, and pass much much faster cars in my ghetto fabulous thundering 160HP E30 325 simply because I have had some schools under my belt. It makes that big of a difference, and the mod is transferrable to other cars.
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  #7  
Old 04-19-2005, 11:10 PM
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Yep, doing my first performance driving school on April 30. Can't wait.
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  #8  
Old 04-20-2005, 04:06 AM
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norihaga norihaga is offline
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Gains are minimal. Sticky tires are about your best option. To replicate the performance effect of an intake, remove spare tire, replace with can of fix-a-flat and drive.

Quote:
Originally Posted by jaydoc1
Yeah, trading up to a 330 or M3 are options, just not options for me right now. Planning on an M5 in a couple years. So I was just curious if anyone had had any luck with upgrades like the Dinan S2 package or if the gains in the 325 were minimal.

Jaydoc
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  #9  
Old 04-20-2005, 06:05 AM
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Artslinger Artslinger is offline
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Quote:
Originally Posted by norihaga
Gains are minimal. Sticky tires are about your best option. To replicate the performance effect of an intake, remove spare tire, replace with can of fix-a-flat and drive.

Yep.

And IMO you could get better times with a light weight shorter clutch pedal and short shifter kit than than a cold air Intake, shark injector and aftermarket exhaust.
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  #10  
Old 04-20-2005, 08:03 AM
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norihaga norihaga is offline
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Quote:
Originally Posted by Artslinger
Yep.

And IMO you could get better times with a light weight shorter clutch pedal and short shifter kit than than a cold air Intake, shark injector and aftermarket exhaust.
Alternatively, he could pay me the $6400 cost of the Dinan S2 treatment and have the bike in my avatar...0-60 times will go down to about 3 seconds on the nose and top speed will go up by about 50 mph. No sloppy control arm bushings either. In fact, no bushings at all, just cush drive rubbers.

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  #11  
Old 04-20-2005, 12:19 PM
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Already have a Hayabusa. No offense to your Avatar bike, of course. (And yes I know your bike would beat the crap out of mine on a road course, just not a drag strip!!)
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  #12  
Old 04-20-2005, 12:21 PM
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jaydoc1 jaydoc1 is offline
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Quote:
Originally Posted by norihaga
Alternatively, he could pay me the $6400 cost of the Dinan S2 treatment and have the bike in my avatar...0-60 times will go down to about 3 seconds on the nose and top speed will go up by about 50 mph. No sloppy control arm bushings either. In fact, no bushings at all, just cush drive rubbers.

See, you got me thinking about motorcycles and not the car.
I like the idea of just ditching the spare and carrying fix-a-flat instead. Just not for long trips.

Jaydoc
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  #13  
Old 04-20-2005, 02:53 PM
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norihaga norihaga is offline
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Quote:
Originally Posted by jaydoc1
Already have a Hayabusa. No offense to your Avatar bike, of course. (And yes I know your bike would beat the crap out of mine on a road course, just not a drag strip!!)
Hayabusas are fun. But scary. Maybe the idle screw was just set a little high, but when I first rode one in '98 (whatever the first year was) it seemed like you could let the clutch out at idle and it would immediately accelerate to c. 35 mph on a closed throttle. Of course, at the time I was riding a 79hp twin. I was a little disappointed that it wouldn't do 4th gear wheelspin like I'd been told.

Suzuki make a good product though - my WV GSX-R was so much easier to work on than my Honda. The WV was designed so you could have the carbs out in about 3 minutes flat with a very long phillips-head and a no. 6 allen key for the tank...the CBR is carefully engineered so that even removing the darn battery takes 30 minutes and a lot of swearing.

Now you know what to do with the 325, though: Haybusa-->BMW motor swap with turbo kit, and original gearbox for that sequential shift. 250 horsepower, easy!
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  #14  
Old 04-21-2005, 10:06 PM
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I'm not sure I want my 325 to wheelie every time I touch the gas pedal but that engine switch does sound interesting.
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  #15  
Old 04-22-2005, 09:09 AM
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norihaga norihaga is offline
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Quote:
Originally Posted by jaydoc1
I'm not sure I want my 325 to wheelie every time I touch the gas pedal but that engine switch does sound interesting.
If it's good enough for Westfield, it's good enough for me:

http://www.westfield-sportscars.co.uk/megabusa.htm

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  #16  
Old 04-23-2005, 10:07 AM
Chupracabre Chupracabre is offline
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Dude

Dude,

I have a 325XI, and I understand you want to be snappy like the 330 or better.

However you bought a 325.

Its like going to a wedding instead of wearing a Tux you are wearing a T-shirt that looks like a Tux.

Don't get me wrong I love my 325, but I know where it stands.
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  #17  
Old 04-23-2005, 11:30 AM
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Yeah, that's what I figured, and I love my 325 also.
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  #18  
Old 04-23-2005, 11:30 AM
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Maybe the V8 M3 is a good upgrade for me when it comes out!
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  #19  
Old 04-23-2005, 04:36 PM
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Quote:
Originally Posted by Chupracabre
Dude,

I have a 325XI, and I understand you want to be snappy like the 330 or better.

However you bought a 325.

Its like going to a wedding instead of wearing a Tux you are wearing a T-shirt that looks like a Tux.

Don't get me wrong I love my 325, but I know where it stands.
I agree with this. My last car was a Porsche and to me there's nothing more lame than someone taking a 1970 911 with 2.0L engine and kitting the body to make it look like a 90s 911 Turbo.

That said, while I made a conscious decision to get a 325i instead of a 330i (I bought mine 2 weeks ago), I still want it to be the best 325i it can be, because it's mine. But I'd definitely go ahead and sell mine and buy a 330i if I felt some crazy craving for power coming on. The price difference between the two is so small, it doesn't make sense trying to jack up a 325i.
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  #20  
Old 04-25-2005, 07:44 AM
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Quote:
Originally Posted by Chupracabre
Dude,

I have a 325XI, and I understand you want to be snappy like the 330 or better.

However you bought a 325.

Its like going to a wedding instead of wearing a Tux you are wearing a T-shirt that looks like a Tux.

Don't get me wrong I love my 325, but I know where it stands.
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  #21  
Old 04-25-2005, 04:04 PM
Mantis Mantis is offline
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Let me get this straight?????

You guys are telling him (and me) that the amount of money to gain some HP is very high compared to what you can get out of it??? Why don't I believe that?

There got to be other companies taking these cars to the next level being a 325i and adding some nice touches.

I have been into cars for a long time and made 11 second Buick Grand national and it didn't cost me all that much compared to where it was. I know the BMW's are more money but thats what we own guys, better then average cars. So if it cost X amount of dollars to get it to move alittle better should be had.

I do however agree that buying a 325i and wanting more should really be considered a 330i. I for one choose the 328i over the 323i for this very same reason.

Well I know someone out there got to know something.... I'm not him as I don't tinker as much as I used to. I would love to super charge mine and exhaust and chip it. Cold air box and all....

Dan
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  #22  
Old 04-25-2005, 07:00 PM
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Quote:
Originally Posted by Mantis
Let me get this straight?????

You guys are telling him (and me) that the amount of money to gain some HP is very high compared to what you can get out of it??? Why don't I believe that?

There got to be other companies taking these cars to the next level being a 325i and adding some nice touches.

I have been into cars for a long time and made 11 second Buick Grand national and it didn't cost me all that much compared to where it was. I know the BMW's are more money but thats what we own guys, better then average cars. So if it cost X amount of dollars to get it to move alittle better should be had.

I do however agree that buying a 325i and wanting more should really be considered a 330i. I for one choose the 328i over the 323i for this very same reason.

Well I know someone out there got to know something.... I'm not him as I don't tinker as much as I used to. I would love to super charge mine and exhaust and chip it. Cold air box and all....

Dan
It`s all dependent on the baseline of the vehicle you`re starting with....it`s well-documented that on a 325 or 330, a CAI, chip, underdrive pullies, and exhaust will net you about 30-35 rear-wheel HP at a cost of approximately $2000. These same mods, applied to say, a new Mustang GT, will cost 30-40% LESS, and net you about 95 RWHP (saw it done recently on HorsePower TV....yeah, I was jealous). Have`nt seen any turbo kits for the E-46 (I`m kinda surprised/disappointed at Dinan for this) The couple of blower setups available run in the $6000-8000 range, and only bring you up to the level of the current M3, so why go thru all the hassle? What we *really* need is for a place like Lingenfelter Engineering to tap the BMW performance market and develop a few *serious* HP-improving mods....or at least a good nitrous system, fer Crissakes....

Regards,
Bob
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  #23  
Old 04-26-2005, 01:52 AM
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For me, a new exhaust and CAI were enough to make a noticeable difference in "snappiness." Is it worth $1200 from a performance standpoint? Probably not.

But it sure sounds sweet.
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  #24  
Old 04-26-2005, 01:11 PM
Andre Yew Andre Yew is offline
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BMW engines and their breathing are fairly optimized. Look at the torque and HP curves in the E46 FAQ: the torque is flat, and the HP is linear with RPM. In other words, breathing isn't a problem here.

I agree that driving school is the best solution here: you'll learn how to get on the throttle sooner and how to carry more speed through the corners, and that will give you a better acceleration feel. After you learn how to do this, you'll know what mods you need to go even faster, and how to use those mods.

--Andre
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  #25  
Old 04-26-2005, 02:07 PM
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Quote:
Originally Posted by Andre Yew
I agree that driving school is the best solution here: you'll learn how to get on the throttle sooner and how to carry more speed through the corners, and that will give you a better acceleration feel. After you learn how to do this, you'll know what mods you need to go even faster, and how to use those mods.

--Andre
I agree that driving schools will give you the skills described above. However, as I started this thread, I have been riding motorcycles most of my life with a fair amount of track day (not racing) time. So these concepts (following the line, late corner entry, trail braking, etc...) aren't new. From what I read here, an exhaust and cold air intake are about the only things which will give a noticible improvement in performance and even that is going to be negligible.
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