2.2 means ~0.11m^3/s (~140g/s).
At 6000 rpm means 2.8 grams of air per stroke.
It should be enaugh for burning a lot of fuel.

Is there an calculator for inputing rail pressure, injectors CC and requested load in order to calculate actual injected quantity and injector opening time?
If not, what is the formula for this specific one?

I`ve found on ebay some China-made turbos at ~200 USD. I know a BMW with such a turbo that works fine from 3 years now (mostly on drag racing, but is a daily driver car too). What do you say about those? Also, a friend recommended me a modified K04 turbo that is rated for ~500 bhp. price for that is about $500. Also, that firiend has some 700cc injectors that will give to me, so probably will need new pistons and rods and a new turbo for those ones