We have test many car first we have test a 1:18 asso 18t which put a 3S lipo can run 55mph then the car broke and we change to 1:10 the fastest we run is 85mph. We also put a 4S in a losi 8ight which use speedpassion 5.5r motor but it only hit 45mph and the battery feel very hot. Just want to share..... We have broke many ESC during the test.....