Anyone interpret this Chart? BMW Stock vs. K&N

[Jim 5]

I found this on a BMW tuner website and don't really understand it.

http://www.eurosporthighperformance.com/pdfs/K&N_test.pdf

I think it says that the BMW stock air filter works better, but I can't really tell.

Can anyone help?

 

[cfromc]

Well, it is a little bit of apples to oranges since the filters are different sizes and the particle size breakdowns "Loading Range" are not the same but taking that into consideration its showing that the BMW filter is better at cleaning the air. The Air Flow chart seems to indicate that the K&N flows more air but the chart leaves something to be desired. Also, I can't tell which filter is which on the dP vs Dirt Capacity at 60 fpm air flow chart. What was the statement being made on the other website in regards to the interpretation of the results?

 

[Jim 5]

There was none. It seemed to show that K&N's replacement cone offering had far less surface area than the BMW factory element and flowed less accordingly.

 

[cfromc]

I read that it flows more but I can't really be sure from the chart and the lack of description on the chart.

 

[ewetho]

First graph definitely showed that it flowed more as marked but the first table was saying was less efficient.