Twister - Motoren: Umbau & Tuning

MFG derFreak

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Mein neuer Beema

www.Ls-Tuning.de

Viele Grüße
Thorsten

*E36 Limo*

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@ Netburner

wenn du deinen hast und verbaut hast, melde dich mal bitte (erzähl mal wie das ding so ist, und ob er bei dir was bringt)

@MCClane

Werde ich gleich tun :))

mfg

Brum Brum

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Schöne Grüße aus der Steiermark, dem grünen Herzen Österreichs!

Wieder falsch angemeldet ;-P

Viele Grüße
Thorsten

*E36 Limo*

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bin dabei mir sowas zu organisieren....wenn interesse besteht und alles klappt.....

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Mfg Lobo, Mod

Miss High Input, High Output

///M

weiss net...

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As you no doubt know, this is one of those discussions that evokes a rather visceral reation among most people - kinda like asking what the best brake pad is or should we use Redline D4 ATF or MTL in our tranny.
Given the criticality of the air filter system as it pertains to engine life, I think it is an important discussion to have. The short answer IMHO is do not use a K&N filter. My basis for that belief is that I've studied as much real data as I could find on the subject and have been convinced that they do not filter well. In addition, as a systems engineer, I can appreciate that they requirements under which K&N filters were developed (e.g., equipment filters for trucks in industrial conditions) are such that their design is by definition compromised for the requirements under which they are used in daily automotive driving (e.g., trucks in industrial zones would tend to have much more regular maintenance done, and the use of an "everlasting" filter requiring cleaning and oiling would be advantageous given a cost-benefit analysis relative to a replaceable paper filter - at least I imagine it would).
So given all that BS I wrote above, the hard evidence I have is the results of analysis done by a filter company comparing K&N to the stock M3 fitler. Among other parameters, the effective filtering area of K&N vs. stock is approximately 1.6ft^2 vs. 8.4ft^2. The argument that K&N makes is that the oiled gauze nature of the filter obviatest he need for such a large effective area as found in the deep pleats of the stock filter. This is not borne out by the evidence as found in the filtering efficiency, in which, as loading of the filter increases from 0 to about 40 g/ft^2, the K&N filtering efficiency increases from 85.2% to 98.1% while the stock filter increases from 93.4% to 99.2%. That lower number on both filters (in unloaded or lightly loaded condition of up to about 2.4 g/ft^2 is significant - there is a whole lot of crap that gets through a K&N under those conditions, and the upper limit on the K&N is not great relative to modern filtering numbers in my opinion.
A note on my own personal biases: I am much less concerned about flow than I am about filtering efficiency and effectiveness. I would gladly give up flow (within reason) to obtain better filtering and therefore improved protection for my car.
Now the problem - I haven't been able to find a decent Society of Automotive Engineers article on the filtering effectiveness of foam filters. I have looked and I will continue to look because I'd like a good quantitative analysis of oiled foam vs. stock. I actually use Amsoil filters in some of my cars (two stage foam with oil) which is similar to the ITG filter. But candidly I'm not totally comfortable doing it other than that fact that I think in general Amsoil makes good quality products (but I hate to trust anything I can't analyze and verify myself).
Another thing to be aware of about K&N: since the oil is so light, it tends to be sucked into the intake if the filter is over oiled. This is particularly bad for modern cars because of the fine mesh that shapes the airflow in the HFM (MAF). The oil can wreck havoc with this system. The foam filter is unlikely to to so because of the higher viscosity of the oil - it won't flow up the intake as easily so it is probably safer (unless you REALLY load up on it)

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Originally posted by ultim3
hmmm...the guys at evosport told me that my ITG was "way more restrictive than a K&N". i don't believe them. They sold me a K&N mostly because my ITG foam wouldn't fit where the dinan powerdyne sc places it (in the brak duct area). Oh well, I miss and love my ITG. Oh, and I mean loooove

Actually, it's true. That's because K&N lets more particles thru their filters. Jim Conforti (of the Shark Injector fame for those living under rocks) did a lot of test and that's why he chose the ITG filters for his intakes.

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MFG Marc
September 11 we will never forget

Alt und Neu

Hmm bissel Leise oder?! :o)