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Originally Posted by JDMDCRX  more pleats sure traps more are at the tips of the pleats. Look at how a stock panel filter wears and you will see its main air stream this were you air stream goes threw once this area gets clogged full of debree and dirt the air stream starts to funnel from the outer edges. Trust me i know how a air filter works ive done lots of flow bench work in the military and civi side.
So far the gas millage is up a bit but i will make judge after a few more tanks of gas. We were getting on avg 16.5-16.7L per 100km. These last to tanks 16.0-16.2L per 100km.
My dads drive normal is setting 4 all the time.
But i still need to see if the previous owner change the diameter for the 285 tires in the ECU |
I'll tell you what, after 10,000 miles take an mpg average, then replace the old dirty stock element. I bet you see a gain at that point.
NOBODY, is going to see a 7% gain in economy by changing an element, unless there was severe neglect prior to doing so. The first thing I would look at is whether the 1618C was used originally. It is the only element spec'd for the 700+cfm that the duramax needs, while meeting the particulate filtration standard.
Yes, I understand how pleated elements load up progressively, beginning at the folds.
As does the one you are referring to. As it does, more filtration moves toward the middle of these deap pleats.
I have yet to see a stock element that was actually dirty enough to load the filter minder. That only means that people are tossing them too early in many cases. Too frequently they get replaced with inferior "purolator" and other universal elements with a fraction of the filtration area. They are inferior.
The typical consumer does not have the ability to accurately determine performance impact from a new element. I will factually state, from personal testing, that the new stock element on an LLY, has 2-3% (measured) of the total intake resistance at rated WOT flow rate. If you could eliminate all of it, you would get a 0.2-0.4% (less than 0.3 mpg) increase in economy. That's by the numbers. In reality, less than half of the resistance can be eliminated, and that's only when new. Within a few thousand miles, the stock element has less resistance, the surface area reality.
Honestly, nobody selling you anything...if you want better economy, get a copy of MaxxTorque at the end of Jun. There is a single intake piece that has 30 times (3000%) the resistance of
any element. Keep an open mind. The average speed across the stock element media is under .3 mph at highway loads. Around 1 mph at WOT loads.
And there is more to this than just resistance. Dirt! There are reasons that GM wanted good filtration. Without knowing the details, I will stake $ that your motor is getting anywhere from 5x-30x the dirt ingestion of a stock element. These kinds of conclusions can be drawn by looking at "Spicer Air Filter Study". The conclusions are independently derived.
Sweet! 
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