[QUOTE=Drift_Buggy;4774407]Suppose you could come into the pits and check the voltage with a multimeter. Going by when it starts to drop hasn't got to do with the voltage but the mah.
Mah is the number that shows how long your voltage should last, higher number = longer run times.
When your car slows, voltage has dropped.
You can see how long it ran and have an idea of what that combo of motor and battery will do.
Put it back on the charger and it will tell you where the voltage is.
Now you know how long it ran and where the voltage dropped to for that motor.
If you pull it as soon as it slows you will find it will be between 7.0 and 6.5 volts. Very safe voltage.
My Novak GTB speed control with lipo cutoff shuts off at about 6.5 volts.
The previous post is very true, if you run a brushed motor for a long time it will get seriously worked so limit your runtime with them.