Air Filter Testing
#76
http://www.crateenginedepot.com/Coba...10449C667.aspx
#80
Senior Member
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Amazon.com: K&N RC-4700DY Yellow Air Filter Wrap: Automotive
There is the one I got, you just change the product ending from Y to whatever color you want. B for black, R for Red etc.
I bought from O'Reilly because I had a coupon.
There is the one I got, you just change the product ending from Y to whatever color you want. B for black, R for Red etc.
I bought from O'Reilly because I had a coupon.
#82
Senior Member
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NP, I love the color match.
Just a bit of an update. The filter wrap has dropped my LTFT from 3.9 to 2.3.
That is the lowest I have ever seen with the K&N on. 3.9 was my previous low. So I can see that the filter wrap does help with LTFT. I'm sure it's added some restriction back. BPV and intake noise is still pretty high if not a touch quieter.
Just a bit of an update. The filter wrap has dropped my LTFT from 3.9 to 2.3.
That is the lowest I have ever seen with the K&N on. 3.9 was my previous low. So I can see that the filter wrap does help with LTFT. I'm sure it's added some restriction back. BPV and intake noise is still pretty high if not a touch quieter.
#84
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I am runing the AEM dryflow, I have never been a fan of the K&N oil. What is the consensus on the AEM?
http://autohifidiszkont.hu/bmw-tunin...szuroteszt.pdf
http://autohifidiszkont.hu/bmw-tunin...szuroteszt.pdf
#85
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I am runing the AEM dryflow, I have never been a fan of the K&N oil. What is the consensus on the AEM?
http://autohifidiszkont.hu/bmw-tunin...szuroteszt.pdf
http://autohifidiszkont.hu/bmw-tunin...szuroteszt.pdf
#88
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I'm running a K&N drop-in for the meantime (TC, will ensure to monitor closely) due to the fact that getting an AC shipped over costs an arm and a leg - almost $70.00 if I recall correctly(!).
On the flipside, the K&N can be bought locally for almost half that.
On the flipside, the K&N can be bought locally for almost half that.
#89
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I bought rissa's old AEM CAI back in the day, then had AEM replace the tube under warranty with an airflow straightener version, So pretty much any new AEM CAI will work and comes with one. But the catch is that you will need a few tunes to get the LTFT and STFT under control. I wish they made a panel filter for the standard intake.
#90
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I jumped on the K&N bandwagon a year after my post; forgot the stats from this report. Took out my K&N that hadn't been cleaned in 30K miles and put in stock filter, feels a tad bit more responsive! Going with stock here on out...thanks for sharing!
#91
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So im gonna just go out on a limb here and say that Injen filters are not gonna be much better if at all than K&N. From what Iv read Injen produces one of the better intakes on the market.
#93
This test has been revised in different forms for a long long time. It's BS. The guy that wrote it is a Charlatan troll. He even states in his opening line that his goal is to discredit. How fair and un biased can you be with an attitude like that but at least the huckster admits it. He did a similar unbiased study on diesel fuel lubricating additives. Again a crock of **** with a recommendation of a new to the market product that he obviously was affiliated with. The filter study is a sham. Don't be fooled.
#94
Sham or not he did make valid points that are true.
A K&N filters for **** (true), and a large enough oem style filter will provide you with all the flow you need to maintain optimal engine horsepower (true).
Don't believe all the K&N or other highflow air filter hype either.
That is the whole point of this thread.
A K&N filters for **** (true), and a large enough oem style filter will provide you with all the flow you need to maintain optimal engine horsepower (true).
Don't believe all the K&N or other highflow air filter hype either.
That is the whole point of this thread.
#95
Senior Member
iTrader: (6)
Sham or not he did make valid points that are true.
A K&N filters for **** (true), and a large enough oem style filter will provide you with all the flow you need to maintain optimal engine horsepower (true).
Don't believe all the K&N or other highflow air filter hype either.
That is the whole point of this thread.
A K&N filters for **** (true), and a large enough oem style filter will provide you with all the flow you need to maintain optimal engine horsepower (true).
Don't believe all the K&N or other highflow air filter hype either.
That is the whole point of this thread.
I still would like to figure out how to take a SS/SC filter housing and make it work on a SS/TC, given the filtration area of the SS/SC filter is greater (or appears that way haven't got my hands on one yet to calculate it) than the SS/TC filtration area.
#96
Senior Member
Can't open the original link at the moment but I've seen quite a few different studies and tests over the years by different individuals, groups and publications with varying quality of test procedures and data. Looking at the filter specs and some of the better, unbiased tests, the usual summary is that the K&N style oiled cotton gauge filters don't filter particulates very well when freshly cleaned and do a better job with respect to filtration once they have more mileage, but they also start to flow less due to increased restriction. A good conventional paper filter in the same size and design normally flows just as well when brand new but degrades much faster although continuing to filter as good as or better than the oiled cotton gauze as it gets dirtier.
Much of the older testing was done on the older style conventional pleated paper filters. It wouldn’t surprise me to see the newer expanded paper fiber/synthetic fiber pleated filters like the OEM on the LNF cars doesn't lose airflow ability as fast as the flat, folded, paper pleated filters (and can likely hold more dirt and has a longer service life). From personal testing at the track on my '08 SS Turbo, both stock and with the GMPP S1 upgrade it was extremely consistent for traps speeds and the engine management was able to produce the same engine torque with almost identical boost required with a fresh K&N or newer OEM filter. I'd swap back and forth every few passes and wouldn't see any changes.
To me that showed the stock air box and filter size likely isn't a restriction on even a mildly modified car and definitely showed no advantage to the aftermarket drop-in filter. As someone who worries about what's going through the turbo, into the engine and keeping debris out I'd much rather run a conventional paper/fiber filter than a freshly serviced and oiled cotton gauze filter. For someone heavily modified I'd probably want to do much more in-depth data logging, maybe wire in some standalone pressure sensors before and after the filter in the intake tract to log pressure drop, etc., but I wouldn't want to just slap on a different aftermarket intake system and think it would automatically work "better" because it has a certain type or size filter, especially when the plumbing is different and you have a MAF sensor located in the inlet tract.
Much of the older testing was done on the older style conventional pleated paper filters. It wouldn’t surprise me to see the newer expanded paper fiber/synthetic fiber pleated filters like the OEM on the LNF cars doesn't lose airflow ability as fast as the flat, folded, paper pleated filters (and can likely hold more dirt and has a longer service life). From personal testing at the track on my '08 SS Turbo, both stock and with the GMPP S1 upgrade it was extremely consistent for traps speeds and the engine management was able to produce the same engine torque with almost identical boost required with a fresh K&N or newer OEM filter. I'd swap back and forth every few passes and wouldn't see any changes.
To me that showed the stock air box and filter size likely isn't a restriction on even a mildly modified car and definitely showed no advantage to the aftermarket drop-in filter. As someone who worries about what's going through the turbo, into the engine and keeping debris out I'd much rather run a conventional paper/fiber filter than a freshly serviced and oiled cotton gauze filter. For someone heavily modified I'd probably want to do much more in-depth data logging, maybe wire in some standalone pressure sensors before and after the filter in the intake tract to log pressure drop, etc., but I wouldn't want to just slap on a different aftermarket intake system and think it would automatically work "better" because it has a certain type or size filter, especially when the plumbing is different and you have a MAF sensor located in the inlet tract.
#97
Former Vendor
iTrader: (3)
^^^ good post. plus the popular filter on a stick esp. on the TC really elevates the hell out of inlet air temp and air density . its all fail, as much as folks want to descredit the testing its been done over and over and its 100% OEM is better. period.
,meh.
ps re your garage, my first vented RL hood had ASC Mclaren hood vents, I purchased a bunch of the NOS stock they even had water collectors that I discarded...
,meh.
ps re your garage, my first vented RL hood had ASC Mclaren hood vents, I purchased a bunch of the NOS stock they even had water collectors that I discarded...
#98
Have you checked out Donaldson's recommendation of filter sizing for the hp level some of the LSJ's and the LNF's are at? Filters are huge.
I still would like to figure out how to take a SS/SC filter housing and make it work on a SS/TC, given the filtration area of the SS/SC filter is greater (or appears that way haven't got my hands on one yet to calculate it) than the SS/TC filtration area.
I still would like to figure out how to take a SS/SC filter housing and make it work on a SS/TC, given the filtration area of the SS/SC filter is greater (or appears that way haven't got my hands on one yet to calculate it) than the SS/TC filtration area.
I just ran the K&N in my airbox for a month to see if there was a difference. My car is stronger in all rpm ranges with the factory ACDelco filter.
It still flows the exact same about 39 lbs/min, and the restriction is on par with a clean K&N drop in when running a blower inlet pressure test.
Another thing I noticed that was crappy about the K&N drop in.... there was tiny grit at the top of the filter where it should be sealing to prevent un metered air. The stock ACDelco has a much nicer sealing surface and provides an air tight seal.
Last edited by Staged07SS; 08-22-2014 at 07:29 AM.
#99
Senior Member
iTrader: (6)
The stock LSJ filter is large enough. It is about an inch taller than the K&N E-0777 drop in, and has deeper pleats, and more filter media.
I just ran the K&N in my airbox for a month to see if there was a difference. My car is stronger in all rpm ranges with the factory ACDelco filter.
It still flows the exact same about 39 lbs/min, and the restriction is on par with a clean K&N drop in when running a blower inlet pressure test.
Another thing I noticed that was crappy about the K&N drop in.... there was tiny grit at the top of the filter where it should be sealing to prevent un metered air. The stock ACDelco has a much nicer sealing surface and provides an air tight seal.
I just ran the K&N in my airbox for a month to see if there was a difference. My car is stronger in all rpm ranges with the factory ACDelco filter.
It still flows the exact same about 39 lbs/min, and the restriction is on par with a clean K&N drop in when running a blower inlet pressure test.
Another thing I noticed that was crappy about the K&N drop in.... there was tiny grit at the top of the filter where it should be sealing to prevent un metered air. The stock ACDelco has a much nicer sealing surface and provides an air tight seal.
I've got a stock LNF intake on the way to do some comparisons, now to find a stock LSJ intake or at least filter housing