I am working of defining a more aggressive tune for the turbo, and i plan to do that with a proper calculation over compressor map.
I've got a chart for a GTB2056 (different AR though).
Made a useful (i think...) spreadsheet with graphic overlay to play around.
But a question arise in my head... all the formulas i've found around said that for the calculation of the Volumetric Flow rate i just use displacement and rpm (+VE%), but, in a 5 cylinder engine, there is a cross opening of the intake and i think on top of the calculate one i need to add another 25%... is that something right ?
Attached you can download the sheet i am using... let me know if my calculation and suppositions are right.
Don't mind the data in it... the inputs i've typed is just for a test