| Don't confuse boost pressure to test pressure with respect to the flow testing air. What this data chart is telling you is when X CFM passed through the intercooler, it caused 1 psi pressure drop. This means if you have 15 psi going into the intercooler, there will be 14 psi coming out of it... similarly 20 psi in = 19 psi out, and so on. With this data you can easily calculate what the pressure drop would be for any given flow rate with this formula: Px = P1/(CFM@1psi/CFM@Xpsi)^2 Where:
Px = the pressure drop
P1 = the pressure drop given by the test data
CFM@1psi = the CFM given by the test data
CFM@Xpsi = the CFM in which you would like to know the pressure drop Working through this using the data from the Ash-spec Massives and 500 CFM gives this: P1 = 1 psi
CFM@1psi = 326.3 CFM
CFM@Xpsi = 500.0 CFM Px = 1/(326.3/500)^2 Px = 2.35 psi pressure drop @ 500 CFM through the Ash-spec Massive intercooler. Now your 15 psi in will equal only 12.65 psi out. Working this through with the stock intercooler to see what it takes to flow the same as the Massive at 1psi pressure drop... the stock intercooler will lose 4.07psi on the other side. This means you would have to boost 18psi out the turbo to see the same 14 psi out of the intercooler as with the massives and only 15psi in. Furthering the complication is the amount of additional heat input to the air to make that 18psi... but that's another story.
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