The amount of fuel injected is pretty arbitrary and depends mostly on how much you tell your Engine-ECU to inject under the given circumstances. So Wesley is right that it's too complicated.
Your calculation is off again, I think. Shouldn't it be something like <max possible rpm> = <max restrictor throughput> / 225[cc/rpm].
Since that value assumes a continuous flow, it is a very rough estimate. Taking valve timing into the equation the, result will be different.