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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 12-22-2005, 08:43 AM
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Orangefiv5 Orangefiv5 is offline
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Mein Auto: 1991 325i Convertible
Question Which do you Prefer???????

I would like to know how people feel about cool air intake? And which air filters they prefer?

I personally have K&N

http://cgi.ebay.com/ebaymotors/BMW-E...QQcmdZViewItem



Thanks,
~Craig
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  #2  
Old 12-22-2005, 09:37 AM
NC318 NC318 is offline
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I am curious, as I don't know the answer to this question, how much true difference and in what context is made by, say, a K&N air filter over the one the car came with. Ie, why should I buy one? Thanks.
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  #3  
Old 12-22-2005, 10:00 AM
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Bimrpwr Bimrpwr is offline
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on my car i still have the factory and talked to my bro about changing it out for one like that and he told me heck no. That the BMW sealed is a very good system..i know that my car has a K&N setup on it sealed one and i was going to do the open one like the link on ebay..so i will just keep what i have..i trust his judgement on this..he has been racing these cars for the past several years and has been ASE certified as well..that is my .02
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  #4  
Old 12-22-2005, 10:02 AM
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Orangefiv5 Orangefiv5 is offline
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True difference is about 3-8 HP. Designed to increase horsepower and acceleration.
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  #5  
Old 12-22-2005, 10:13 AM
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Orangefiv5 Orangefiv5 is offline
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Your set up is different then the one on my car NC318.
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  #6  
Old 12-22-2005, 10:20 AM
NC318 NC318 is offline
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^ Thanks! As I said I was always curious about this question.
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  #7  
Old 12-22-2005, 11:34 AM
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dkmr dkmr is offline
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Quote:
Originally Posted by Orangefiv5
I would like to know how people feel about cool air intake? And which air filters they prefer?

I personally have K&N

http://cgi.ebay.com/ebaymotors/BMW-E...QQcmdZViewItem



Thanks,
~Craig
The K&N is the filter I would go with, but you do more harm than good having the filter open to the engine bay. Sealing it off from the heat of the engine is best. There are kits out there that have the airbox and some sites with instructions on how to do this. I'll do some digging and see if I can find them again.
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  #8  
Old 12-22-2005, 02:20 PM
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BMWjunkie BMWjunkie is offline
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for most cars--the only difference in changing the original air box to a cold air or K&N will be a "throatier" sound to the engine, but performance improvements will be slim to none.
i'm also on an infiniti owners group site and i own a 90Q45. the car is a beast,,,and on the highway their are few cars on the road that can keep up from 60mph on. there are some VERY knowledgable people on that site (scientists and engineers) who have actually measured the increase in air flow and temp. before and after a diff. airbox/filter is added.
the results are always minimal, if at all. if you only go by "seat of your pants" performance,,,,you'll never feel a 3-5 mph increase!!!! most performance car companies (infiniti--bmw) spend a ton of r&d on maximizing the air intake systems. for all these years the Q45 has been on the road, no one has produced a substantial increase in the intake system.
IMHO--there are much better places to gain horsepower without risking letting MUCH more dirt into your intake system.
like i said,,if your going by something that looks cool when you open the hood, or by a deeper sound--go with a cold air system--but for me, i'll stay with maximum protection of my very valuable engine in two cars that i love.
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  #9  
Old 12-22-2005, 05:19 PM
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lordofthewaters lordofthewaters is offline
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I've heard that COI's will not only give you a few horses, but will also increase your mileage (which to me is worth it). Even 2 or 3 miles will eventually add up. Of course it's not worth it, if you don't have an effective heat shield. Sucking up all that hot air from the engine bay defeats the purpose of a COI. I suppose that's why I've seen those intakes that are ran from the brake cooler vent in front.
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  #10  
Old 12-22-2005, 07:37 PM
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you're right,,,unless you can vent air from down low under the spoiler or even in the wheel wheels,,,not a true COLD AIR INTACT.
my concern with my mint condition 87,,,,,is,,,,,,,,,do i really want/need a little extra "grunt" when at full throttle to sacrifice the cleaning abilities of the stock airbox?
in the long run,,,,much better to eat up all that dirt caught by the stock system,,,assuming the filter is clean, than a horsepower increase you'll never feel (or can measure), and a little more growl. better to get a new muffler!!!!
AT LEAST THAT WONT DAMAGE THE ENGINE!!!!!
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  #11  
Old 12-22-2005, 07:45 PM
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THE PROBLEM WITH MANY AFTERMARKET PARTS IS,,,,,THEY'VE NEVER REALLY BEEN MEASURED IN ANY KIND OF SCIENTIFIC WAY.
even if they promise a 2-3 mpg increase (and i use "promise" loosely), is it worth the damage that you would be doing to your engine?????
assuming they save you that in a year,,,,,,,is it worth replacing the ENTIRE car next year????
stick with the mods that noticibly (documented!) increase performance and that don't kill the life of your car. having a clean intake is VITAL!
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  #12  
Old 12-22-2005, 07:55 PM
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I've seen people layer pantyhose over their filter, 2 or 3 layers held of by a rubber band or "zip tie" then they take the hose off and then replace or clean the filter or whatever. I don't know wether this improves the cleaning ability of the filter or not. Could be something to look into. As far as the intake in the brake duct......I would certainly not want to do it. Imagine what a big puddle would do........
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  #13  
Old 12-22-2005, 11:33 PM
mike b mike b is offline
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I put a K&N filter on my 325i when I first bought it. Bad mistake. First of all, there was no noticable increase in power or MPG over the stock unit. Second, the filter needs to be cleaned at smaller intervals (15K miles) than specified by the manufacturer. Initially I was fine with that as the recharge kit wasn't that expensive. But that is when I noticed the real problem. With every cleaning, the fiber material in the filter opened up progressively larger holes, usually right on the edge of the pleats towards the TB. So much for filtering particals out of the air. In addition, I could never saturate the filter media with oil in a uniform manner like they do at the factory. It didn't even matter if I took the car down for a day and let the new oil migrate through the fiber (I'm talking 12+ hours). I always ended up with some areas having a heavier concentration of oil than others. Maybe if I could spray it on in a fine mist the results would have been different but the oil they supply is pretty thick and I don't think it will mist out of a spray bottle very well. The results??? Dirt and excess oil were discharged as I drove the vehicle and collected around the inside of the AFM to TB bellows, the flapper and sensor in the AFM, the TB butterfly and intake manifold (and probably as far down in the engine as the fuel injectors and valves). When the build up was sufficient, the car would idle like crap no matter what the engine tempurature was, acceleration was sluggish and the car just wasn't any fun to drive any more. I was cleaning my TB with carb cleaner every 5K - 10K miles and was not a happy camper. And did I mention there is no safe way to remove any buildup on the AFM sensor? After putting 45K on the filter, I chucked it for an OEM filter and replaced the AFM and will not go back to aftermarket again for any reason. I've driven almost 90K miles on my car over the past four years and I can tell you the stock system is better you think it is. IMHO, you can swap it out for something 'cooler' if you want to, but your just opening up a bag of worms for yourself down the road. It wouldn't surprise me if aftermarket filters are the number one reason people come to an E30 forum looking for help trying to diagnose a drive/idle problem with their ride. I'll step off my soapbox now.

That said, I have two (2) CAI boxes (actually just an 'L' shaped partition with rubber seals on the top and a cutout for the AFM to cone filter) if anyone still wants to try using a cone filter in place of their stock filter system. I'll part with them for $35 each plus shipping. I think I paid $50 for each of them from elukas(???) on eBay. These were never used and are just collecting dust in my parts room. They were cut for the 88 to 91 model year 325i with M20B25 engines. I don't believe they will fit the 318 or older model 325 as the AFM is mounted in a different position. Send me an e-mail but only if your seriously interested. Air is sourced from behind the left high-beam as it is with the stock setup.

Mike

Last edited by mike b; 12-22-2005 at 11:41 PM.
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  #14  
Old 01-02-2006, 12:21 PM
nayr nayr is offline
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i put a k&n filter on my car and it made a big difference. 0-60 time went down by more then 1 sec and i 2 mpg better

ryan
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  #15  
Old 01-02-2006, 12:25 PM
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chuck92103 chuck92103 is offline
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Quote:
Originally Posted by nayr
i put a k&n filter on my car and it made a big difference. 0-60 time went down by more then 1 sec and i 2 mpg better

ryan
The 1 second is very, very, very hard to believe. That represents approximately 15% increase in horsepower. No way.

I suspect you had a very dirty stock filter and saw some modest gain at best.
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  #16  
Old 01-02-2006, 01:30 PM
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i agree,,,,,MORE than one second????? don't believe it.
i've seen road and track and car and driver magazine do comparisons with corvettes, mustangs, etc. when they compared stock numbers vs. HEAVILY modified engines, trans, suspension, etc,,,,,,,like 10-20 grand in mods (turbo, blowers, etc.) and i'm always shocked to see, maybe a second increase in 0-60 times. never more than 1.5 to 2 second increase and thats with a turbo or supercharger. no way an air filter for 40 bucks will yield the same results!!!!
do you have verifiable before and after numbers? dyno readings? if you can prove that i'm sure k&n will be at your place ready to sign you for an endorsment deal!!!
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  #17  
Old 01-09-2006, 02:48 PM
kamakevie kamakevie is offline
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i bought a k&n intake for my 1988 M3..MISTAKE! i didn't notice any difference, not even in sound. i think it is better to just keep it stock because a k&n filter without a heat shield is causing more hot air from the engine to be sucked up than before. i think a cone filter will be fine if it is properly isolated from the hot air.
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  #18  
Old 10-13-2007, 08:39 AM
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Soviet1942 Soviet1942 is offline
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What if you have a heat shield, is it then logical to install it?
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  #19  
Old 10-13-2007, 12:20 PM
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omw41 omw41 is offline
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IMHO...stick with the stock setup and spend your money on something else.
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  #20  
Old 10-13-2007, 03:34 PM
einstein57 einstein57 is offline
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There is very little gain in a k&n filter for an m20 engine. your better off investing in a m30 maf. not a huge hp increase but more than a cone filter.
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  #21  
Old 10-13-2007, 05:56 PM
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Soviet1942 Soviet1942 is offline
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Originally Posted by omw41 View Post
IMHO...stick with the stock setup and spend your money on something else.
Thing is my dad's friend gave it to him and he then gave it to me when I got the car.
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  #22  
Old 10-13-2007, 07:04 PM
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omw41 omw41 is offline
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Thing is my dad's friend gave it to him and he then gave it to me when I got the car.
Ok...then spend your time on something else.
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  #23  
Old 10-13-2007, 07:07 PM
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Soviet1942 Soviet1942 is offline
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Ok...then spend your time on something else.
Headers?
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  #24  
Old 10-14-2007, 12:33 PM
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Headers?
I'm a bad guy to ask because I prefer to keep it all stock...I mean whatever you like ...it's your car...the Cone type filter won't kill the car...I'm just not sure it's worth the expense and effort...
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  #25  
Old 10-14-2007, 05:50 PM
JmsRad23 JmsRad23 is offline
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I Just purchased a K&N cone filter and there is little to no room to install a heat shield. Literally the cone fits just in there with little room to spare. Idk whether to keep it in there or not cuz im not sure if a heat shield will fit. Is it worth it to keep it in without a heat shield????
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