When to replace a reusable air filter in a superduty truck?

ShinerBock wrote:

Old-Biscuit wrote:
Here you go.........

Read it, study it and then go buy a stock filter

LINK

Yes, I have read that test done many years ago many times. However, as was stated in the original document, they only tested a sectional cut out of each filter and the big difference between stock filters and aftermarket filters are is size.

What that tests also proves is that yes, stock paper filters do have higher ability to capture dirt, higher dirt capacity, and lowest dirt passing through, but that they are also more restrictive per sectional cut out than the aftermarket. This has been known for years which is why it is a give and take on filter efficiency over filter restriction. The question is, how much dirt is allowable and will not have any effect on your engine versus how much will hurt it. If you can increase flow while still being within safe levels of silicon on your UOA then what is the problem?

There is the other thing that the test does not test, which is size of the filter which will make a big difference since most aftermarket intakes are considerably larger than stock ones. As stated in my last post, increasing the size of the filter increases available flow, it increases the filters holding capacity, and helps lower EGTs among other things. Take the second to the last chart where it talks about dust loading. Filters like the AFE Pro-Guard 7 did considerably well when stacked up against the other paper filters when it comes to its ability to capture dirt and how much diest allowed to pass through in a section. It also at higher flow rates per section. However, most Pro-Guard 7 is more than twice as large as a stock filter in many applications increasing its overall dirt holding ability and sectional dirt holding ability since the pressure is more spread out over the whole filter instead of a smaller square.