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will increase the mass air flow to the engine by 6.7% on an NA motor. Assuming the additonal fuel to use this air is available, then you should expect a 6.7% increase in HP. This is an increase of 14-15 hp on a stock NA. Not insignificant. The issue is what type of fan will it take to move 400 cubic feet of air agains this 1 psi head. I doubt that the 3 inch ducted fan in the eRam will do it. The gains will be less on a turbo charged car for two reasons. First, increasing the suction pressure of the turbo compressor by 1 psi will not necessarily give a 1 psi increase in discharge pressure. Secondly, even if it did, the increase in mass air flow to the engine will be less. Only 4% for a unit with 9 psi boost only 3% for a unit running 14 psi boost. Finally, the axial fan will now have to move more air against the 1psi head and this will increase the required HP. All of this can be easily calculated, and one problem I have with those selling these devices is that they never give out the hard performance numbers for their fans. I repeatedly asked the eRam guy to provide me with a performance curve for his unit showing ACFM vs head. This is a very standard curve for any type of air moving device. I got a lot of verbage, but never got the curves. You decide what this means.
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