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Originally Posted by bvstone
You're not increasing airflow doing this.. what you are doing is increasing the size of the airbox which should help low end torque.
By this I mean by removing part of the snorkle, the volume of the removed piece is the volume of the airbox that you are gaining. Can't hurt. Resetting the computer... that's something like a wives tail IMHO.. the ECU will adjust on it's own.
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with the current setup, the air pulled through the snorkel only sees a small area of the lower part of the filter since it is so close. for the air to travel through more of the filter, it would have to make two 90º turns, does not happen. that would take too much force to move the airflow like that. instead, it takes the path of least resistance, which is to flow through a small part of the filter.
by removing the long snorkel, the air can spread out, slow down, and flow through more of the filter, resulting in less resistance and less hp losses.
you can equate it to electrical theory, there V=IR. in the case of flow, P=VR, where p = pressure, v = volumetric flow rate, and r = flow resistance.
just like you decrease electrical resistance with larger wire, increasing filter size will decrease air flow resistance.
P=VR, V=P/R. pressure remains the same (or close to) because the driving pressure is simply the difference between the vacuum inside the engine as teh air is being pulled in and the atmospheric pressure of the air coming in.
that means if resistance decreases (which it does b/c of the bigger flow surface), the flow rate V will increase. this means the engine can pull the air into the chambers easier, saving HP.