This is what i was lookin for
http://www.airsoftcanada.com/SpringChart.php
And yes my suggestions wer in a perfect world where springs wer labled with m meaning meters per seccond. I know there is some variances form brand to brand.
Illusion put many to the test back in the day his chart is helpfull
Edit i see rusty pointed him to the chart alrdy. Guess it would help if i read the whole thread lol