Is that a stock OEM filter? I don't doubt that your pulling some serious flow but wonder if the sensor is bad or their is something else going on. How much boost do you build? I'm not tuned much but my 6.0 doesn't even register on the vacuum sensor for the filter and it will spool to 26 lbs fast. It's kinda oranges and apples but your 6.4 liter displacement and combined boost I would think the volume is like 8-9 liters with full boost- just a WAG so if someone knows for sure please correct me. I guess my thought is unless your running a lot higher boost pressure than stock then the volume shouldn't be that much different. Tuning affects timing, fueling and speed of boost from what I understand. Volume is volume in and out of the engine. I suppose if the RPMs increase faster than stock then the rate of flow would be different. I guess my concern would be along the lines of what John is saying that flow is increased in aftermarket because it doesn't filter as much allowing more air flow. Is there a way to increase flow/ reduce restriction AND still use stock filters is the question.
Yes Wes, usually a Wix, but this happens on all the stock filters. It will get to the high 30's on boost. If one were diligent the oil treatment filters would likely out-perform stock filters in both restriction and filtration, but we put miles on too fast in too dirty of environments to take the risk. If I could get a comparable dry filter in regard to filtration, even though I may need to change it frequently, I would be interested.
I am not interested in this for the heavy footed - let's see how fast I can get to the next stop light aspect, but rather for efficiency and longevity, as we haul up to 30,000 lbs. gross with this pickup/trailer. We legally can haul more if we licensed for more, but accept for occasional short trips on flat land - which we rarely do - I don't feel comfortable pulling more than that from a safety and wear and tear standpoint.
I am in construction, and will not risk dusting the engine if I cannot be convinced that the filtration is as good or better than stock. However, stock didn't account for the air flow that mine evidently would like to have now. Stock DID provide 4 mpg less mileage than I now get with modifications, and I have record of every fuel up since it was new that gets input into excel for cost per mile calculations. I am not at all impressed with what the engine manufactures are required to conjur up in order to meet current emission standards.
But I digress, you, JohnP, and I have had this dialogue before as I recall.
I really just wanted recommendations and experience with aftermarket air intake systems. The size of the air filters relative to horsepower produced in this pick up compared to the heavy equipment that we run pales in comparison. If I could figure out how to get a primary and secondary air filter off of say a 330 excavator under the hood I would do it in a heartbeat.
Regarding egt's John, I ran the same engine at the same horsepower in a T600 and a 378. The T 600 had one small filter under the hood - the 378 had two large ones mounted outside. The egt difference was typically about 200 degrees different on the same hill, with the same load, and the same outside temperature. That is proof enough for me.
P.S. aFe advertises 99.4% with dry and 99.7% with oiled. It would be good to see an independent test on a variety of brands. And yes, during the Mt. St. Helens ash that we drove in, those that had oil bath filters faired much better.