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85% efficiency
444 cubic inch = 415CFM
3800RPM
85% efficiency
350 cubic inch = 603CFM
7000RPM
Now, this is for naturally aspirated motors, and is just a rough guesstimate. But even with a boosted 7.3L, 14.7psi (two atmospheres of pressure, higher than our 7.3s see) would net you around 830CFM. That would be about on par with a naturally aspirated big block...I am not saying I'm anywhere close to accurate on the turbo'd 7.3 figure- I couldn't find much about flow rates of turbo motors. I know the volumetric efficiency would be much higher than NA, but oh well. You get the drift.
Keeping engine displacement and VE the same, doubling the RPM requires double the airflow. Seeing as our diesels hardly can be considered high RPM or boost machines, I would feel safe saying that fancy air filters will do nothing for you. More important things to me would be the temperature of the air and the filtration...
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1994 Ford F250 4x4: 7.3L IDI factory turbo, supercab longbed, E4OD *DEAD*. ZF5 swap,Dana 60 swap, GM 14 bolt rear w/ 4.10s, 4" exhaust from stock downpipe back to a 5" stack, IP maxed=1100 degrees max pulling uphill, "modified" wastegate=11psi max,99+ F450SD cab/chassis leaf springs in rear
--motor/trans sold--
2000 VW Jetta TDI = 48+mpg
Member of Indiana Air National Guard 122FW MXS
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