What #s are you seeing for lbs of airflow..
02-09-2006, 08:35 AM
#45
Originally Posted by RedHardSupra
this is a very good question. i was toying with a similar idea last year
http://redhardsupra.blogspot.com/200...olumetric.html
but i think if you turn some of the equations around you'd get an equation for fuel flow at given rpm,efficiency and airflow. rpm and airflow is measurable, ve we can get tuned in so that's a lookup. it should work, right? anybody?
http://redhardsupra.blogspot.com/200...olumetric.html
but i think if you turn some of the equations around you'd get an equation for fuel flow at given rpm,efficiency and airflow. rpm and airflow is measurable, ve we can get tuned in so that's a lookup. it should work, right? anybody?
since your dynamic airflow (assuming ve calibrated) or maf reading (assuming maf calibrated correctly) already takes into account engine efficiency at a given rpm it would make sense that you could take your airflow rate and divide by your a/f ratio to get fuel flow.
Thus...
50lbs/min of air (measured or calculated flow of what the engine is actually pumping thus taking into account ve)
12.5 a/f ratio
50lbs/min /12.5 = 4 lbs/min
4 lbs/min * 60 = 240 lbs/hr
240lbs/hr / 8 cylinders = 30lbs/hr injectors at 100% duty cycle
I guess my point is you only need airflow and a/f or rpm,ve,displacement (to calc airflow) and a/f to get desired fuel flow.
Thoughts?
Last edited by shizon; 02-09-2006 at 08:41 AM.