I would like some constructive criticism on this engine airflow rate calulator I made for choosing the best compressor map. It will give the corrected airflow rate in lbs/min based only upon:

1) Fuel flow
2) AFR
3) Ambient temperature

It opens in Excel.

http://usu.edu/~jgastrich/EngineFlowCalc.xls

Will this predict the current airflow rate of the engine within the uncertainty of your injectors and your air/fuel meter? If so, this seems like a better bet than guessing your VE like an many calculators I have seen. Are there any other variables I'm missing?

Justin

 

bump

 

nice job.

it seems to work right for me and tends to confirm a formula i have used re airflow and turbo sizing.

as far as constructive criticism...

since the power fc/datalogit reports boost and AFR differently than your table which uses psi and the AFR ratio... might you build in a formula so you could cut and directly paste the relevant data?

howard coleman

 

Very Nice! I will be using it.

 

I purposely left the columns to the left for users to enter whatever formulas they wanted depending on what data they have actually logged.

Send a Power FC datalog to rotor_rage@yahoo.com for me to look at. Maybe I will make one of the Datalog worksheets Power FC specific.

Justin

 

HEY, know youre a turbo guy bu any idea where to find a chart like this for n/a??

 

This works with turbo or n/a. It simple looks at fuel flow and AFR. As long as you are datalogging these two parameters you can calculate your mass flowrate of air.

Justin

 

link no longer working....