TBI
; Val = 1461.5 * (VOL/RATE)

PFI
; Val = 365.375 * (VOL/RATE) 365.375 x 4 = 1461.5 so 4X as many injectors!
Seems easy. But when I use Robert's numbers for the 3.1 from page 1 and work backward the constant works out to something like 906. 1461 / 3 does not equal 906. So maybe not so easy...

That book is definitely crammed full of engineer speak. Maybe he thinks he's making it easy for us... :)

You're right... we could calculate the maximum rpm available to the injector based on the number of times the injector is turned on. But that doesn't tell us where the injector will actually go static based on VE table.