Ok first step make sure you actually MEASURE your UPLOAD speed,
http://bandwidthplace.com/speedtest/fut.html . Check it a few different times because it will change thruout the day, and use the average.
Now to find the Maxrate : take your upload measurement and divide by 8, now divide that amount by # players and thats your maxRate.
MaxRate = (Upload speed/8) / #players.
The maths always tricky, lol.