After market K&N air filter results??

BMW2Hart · 11-08-2007, 08:56 AM

Is there anyone out there that have before and after results of upgrading to a K&N filter (or equiv)?

IE: Performance gains, MPG

diff...

HyperM3 · 11-08-2007, 09:06 AM

Most results are just a piece of mind. Most testing is done for flow capacity in terms of paper vs. foam vs. oiled. Youll find a lot of threads on this in the forced induction section.

thekurgan · 11-08-2007, 09:20 AM

Quote:

Originally Posted by HyperM3

Most results are just a piece of mind. Most testing is done for flow capacity in terms of paper vs. foam vs. oiled. Youll find a lot of threads on this in the forced induction section.

+1, not to mention those filters will allow a much higher level of pollutants into the engine and oil. I think minor gains are not worth the longevity of the engine, IMHO.

noro · 11-08-2007, 09:24 AM

My mechanic who has done at least 50 BMW engine rebuilds told me that if I am lucky I'll get 5 more HP in the upper range but that will drastically increase the amount of dirt going into the engine.

normtrum · 11-08-2007, 10:02 AM

ya I think 4-5 hp is what k&N claims? it's not much, and you can't feel it. I bought mine for reasons mentioned above.

bartman32 · 11-08-2007, 11:42 AM

I've heard that again and again. However this is my 3rd K&N and I typically keep my cars for 6-8 years. I've never had any problems with these. No engine problems at all! Maybe I'm just lucky though. I have put one in my 335i and my wife's SUV too!

RMRC · 11-08-2007, 12:36 PM

Quote:

Originally Posted by bartman32

I've heard that again and again. However this is my 3rd K&N and I typically keep my cars for 6-8 years. I've never had any problems with these. No engine problems at all! Maybe I'm just lucky though. I have put one in my 335i and my wife's SUV too!

I would be interested in a Used oil Analysis of your oil after 5k miles vs. my oil after 5k miles. Then we could compare the contaminants that reach the oil. I have 1,500 miles on my oil (3k on car) and will change it at 6,500 miles. I'll do an analysis and post it. It would be great if someone with a K&N would do the same for comparison. Assuming similar driving conditions, it would put the argument to rest for everyone.

HyperM3 · 11-08-2007, 12:51 PM

Quote:

Originally Posted by reb03

I would be interested in a Used oil Analysis of your oil after 5k miles vs. my oil after 5k miles. Then we could compare the contaminants that reach the oil. I have 1,500 miles on my oil (3k on car) and will change it at 6,500 miles. I'll do an analysis and post it. It would be great if someone with a K&N would do the same for comparison. Assuming similar driving conditions, it would put the argument to rest for everyone.

Actually, if you want to get really technical about it, you should wait longer. If the oil is what actually traps the particals in the K&N, then you would want to wait till you have at least 15k on it before you test the oil(I would think). At 6500k the filter is still new enough that its not letting that much pass through.

Then again, the climate youre in has a lot to do with it too. In AZ or NV they have a lot more sandstorms than we do up here in the northeast. Therefore everyone will have different oil analysis'. I think you need to get a widerspread demographic for this to actually be valid. Cant take one car at 6500 that shows millions more particals being let through in the oil and say thats the complete truth. Another car in the complete opposite of the country might have only 100 particals let through at the same interval.

bartman32 · 11-08-2007, 01:18 PM

Okay but who waits 15000 miles between oil changes?

HyperM3 · 11-08-2007, 01:21 PM

Quote:

Originally Posted by bartman32

Okay but who waits 15000 miles between oil changes?

Some people who just go by what the car says to do.

Regardless, Im saying wait at least 15000 miles on the filter. Even if the oil is fresh youll see how many particals are in it.

BMW2Hart · 11-08-2007, 01:21 PM

I'm not a most knowledgable guy when it comes to engines, but know the basics.

Air and fuel go into the combuston chamber, spark flashes, air and fuel go bang and then out the exaust.

How would particals in the air (via intake though the air filter) get into the oil, or much at all? Would not the particals get burned and disintegrate?

Thanks.

HyperM3 · 11-08-2007, 01:23 PM

Quote:

Originally Posted by BMW2Hart

How would particals in the air (via intake though the air filter) get into the oil, or much at all? Would not the particals get burned and disintegrate?

Thanks.

Dont worry, Ive always asked the same questions

in my head.

11-08-2007, 08:56 AM	#1
BMW2Hart Sparkling Graphite Metallic 10 Rep 109 Posts Drives: '06 E90 325i, Sport, Type 161 Join Date: Oct 2007 Location: Georgia, USA iTrader: (0)	After market K&N air filter results?? Is there anyone out there that have before and after results of upgrading to a K&N filter (or equiv)? IE: Performance gains, MPG diff...
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11-08-2007, 09:06 AM	#2
HyperM3 Too many Alex's, from now on, call me Beaufort 342 Rep 6,188 Posts Drives: See Sig Join Date: Feb 2007 Location: Lawrenceville, NJ iTrader: (8)	Most results are just a piece of mind. Most testing is done for flow capacity in terms of paper vs. foam vs. oiled. Youll find a lot of threads on this in the forced induction section. __________________ 13 HD FatBob 17 A4 Glacier/Black 1st Edition/Pre+/Sport/EurocodeTMD/Racechip 16 S6 (gone),14 S6 (gone),14 S6 (gone),13 S6 (gone),10 S4 (gone) 07 335i(gone)
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11-08-2007, 09:24 AM	#4
noro Colonel 90 Rep 2,707 Posts Drives: '91 M3, '04 E46 ZHP, '72 2002 Join Date: Aug 2006 Location: Boston iTrader: (0)	My mechanic who has done at least 50 BMW engine rebuilds told me that if I am lucky I'll get 5 more HP in the upper range but that will drastically increase the amount of dirt going into the engine. __________________ zhpregistry.net - ZHP stats and free classifieds.
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11-08-2007, 10:02 AM	#5
normtrum Colonel 52 Rep 2,225 Posts Drives: e90 335i, e46 330i Join Date: Feb 2007 Location: PNW iTrader: (1)	ya I think 4-5 hp is what k&N claims? it's not much, and you can't feel it. I bought mine for reasons mentioned above. __________________ 07 335i sedan \| Steptronic \| Black saphire \| Terra \| ZPP \| ZSP \| Cold Weather \| CA \| PDC \| Nav \| OEM Alarm
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11-08-2007, 11:42 AM	#6
bartman32 Colonel 101 Rep 2,317 Posts Drives: F87 M2 Join Date: Feb 2007 Location: The OC iTrader: (0) Garage List 2017 M2 [0.00]	I've heard that again and again. However this is my 3rd K&N and I typically keep my cars for 6-8 years. I've never had any problems with these. No engine problems at all! Maybe I'm just lucky though. I have put one in my 335i and my wife's SUV too!
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11-08-2007, 01:18 PM	#9
bartman32 Colonel 101 Rep 2,317 Posts Drives: F87 M2 Join Date: Feb 2007 Location: The OC iTrader: (0) Garage List 2017 M2 [0.00]	Okay but who waits 15000 miles between oil changes?
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11-08-2007, 01:21 PM	#11
BMW2Hart Sparkling Graphite Metallic 10 Rep 109 Posts Drives: '06 E90 325i, Sport, Type 161 Join Date: Oct 2007 Location: Georgia, USA iTrader: (0)	I'm not a most knowledgable guy when it comes to engines, but know the basics. Air and fuel go into the combuston chamber, spark flashes, air and fuel go bang and then out the exaust. How would particals in the air (via intake though the air filter) get into the oil, or much at all? Would not the particals get burned and disintegrate? Thanks.
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