to get the actual flow numbers at xxpsi you have to dynamicly flowtest the injectors (test them at all pulswidths, most injectors are not lineare in their output)
but if you assume the injector flow is linear this formula works.
squareroot(new pressure / old pressure) * old flow rate.
V(80/43,5)1680 = 2278,3cc
from what i've read alcohol FI cars usualy range from 1.1 - 1.3 bsfc
why\how are you running 14 injectors? if it's a 4 cylinder it makes more sense to run either 12 or 16?
does somewhere such as RC engineering do the dynamic flow testing of the injectors ?
after all these calculations were made, and perhaps sometime in the middle of these calculations, i found a grip of formulas provided by RC Engineering,
RC Engineering - technical
the guy we have been using to tune the car has been doing this stuff for years, in his findings he states it takes about 2lbs of alcohol fuel/ per HP. now after reading very little (what ive done in the past 2 days or so) i see recomended BSFC numbers for what i belive is gasoline engines NA .45-.55 bsfc, turbocharged gas engines .60-.65 bsfc. simply doubling the gasoline turbocharged number would put us about 1.20-1.30 which is what ive seen others write, as well as you tell me. during the 1st dyno sessions we had found a number of 1.7-1.8 as the bsfc, but the timing number was super low, and the wideband showed lean, but the sparkplugs did not show any signs of heat or anything that would tell us we are in the wrong 'window', other than a little bit wavy of a HP curve, and what seemed to be down about 75-100hp. after throwing a bunch more timing & more fuel at it (wideband still showing lean, until we got up to aroun 2.0 bsfc) the car picked up huge power.
after talking to a fellow racer over the weekend, he claims to be using a 1.1lbs of fuel per HP made. i dont know if i should belive, or just call bs, based on what we have found thus far ???
i think they are running 12 and then 2 injected into the upper charge pipe.. Id dig up a picture but im too lazy
exactly what it is