[mwebb]

there are formulas in this thread to calculate pulse size
but
they assume 100% Volumetric Efficiency , which is also the goal
but
for partial load at part throttle VE is considerably less than 100% .

in a perfect world individual pulse volume would be the number of cylinders divided into the displacement
total flow would be that value multiplied by 50% of rpm .

to calculate pulse volume to optimize flow is there a fudge factor multiplier to be considered ?

as an example on an NA engine-
most cars / engines can get to between 90 and 95% calculated load
AT WOT , WideOpenThrottle above 4k rpm
Because there is restriction to flow from the air intake to the tail pipe .
so VE is about 90 to 95% on those engines

you could multiply
displacement X .925 X 50% of rpm to approximate total available flow at WOT above about 4000 rpm and you would be in the ballpark .

is there an online database to study and learn about this stuff ?