Thinking about a speed run car

have you got all your electrics e.t.c yet?
i am thinking of making a speed car out of my tc4 i was trying to work out what kind of speeds it could acheive e.t.c with the speed calculator but i didn't what values to put in for the 1st 3 boxes
i was planning on using a tekin 6200kv motor on 5s with a mamba monster speed controller
have you decided on a voltage e.t.c yet?