Sorry if this is a repost. I stumbled on this and my eyeballs popped out. Thought I would share.

http://www.hobracing.com/tech/tpi_flow.asp

 

Caffeine is hitting.

To be useful, those numbers were done at 28 inches of water, or 1 psi of vacuum (-1 psi of pressure) across the flow path inlet and outlet of each part.

A 350ci engine at 6,000 RPM moves 608 cfm through it, purely by volume. This means 0 psi vacuum, perfect flow. (Volumetric Efficiency = 1) At 5,500 RPM it is 557 cfm.

1 psi of vacuum, means flow restrictions are present and now a pressure difference of 1 psi exists between outside air pressure and where it is measured along the intake path. To take some numbers from the table above

Stock TPI Bosch MAF sensor w/ screens -- 517.8 cfm

This means that 1 psi will appear across the inlet and outlet of the MAF at 517.8 CFM. Since airflow resistance is exponential, I suppose this is the max airflow you would ever want to put through it without it becoming the flow bottleneck.

Each component along the way needs to be looked at - TB, runners, etc. I imagine all of their ratings should be above the flow number for a 350ci at the RPM you want to make power at or else they will choke off the flow.

Note that each intake runner (of eight) must flow 1/4 ( four per head, four stroke engine) of that number 608 cfm / 4 = moves 152 cfm by volume, at 6,000 RPM.

Someone please check my math!

 

Does the math matter? Collectively, TGO's membership has run various combos. It's not hard to find out what works vs what doesn't. Until you put something together and try it, you're still just guessing, regardless how someone tested parts (un)scientifically. Who's to say the part they tested that day is representative of every copy of that part produced? Who's to say how accurate their testing was, or how it translates to real life, on the track, or on the street?