Originally Posted by fyrstormer

Standard RC car bodies are almost never good for 100mph without some kind of modification. Remember unlike a normal car, a RC car body is hollow on the underside and can act like a parachute if too much air gets under it, and wind gusts have vastly more effect on a 4-pound RC car than they do on a 4000-pound real car. You need lots of extra downforce to counteract the possibility of the car being launched off the pavement by bouncing over a pebble and getting a bubble of air under the body. The fastest class of RC race cars, 1/8-scale GT cars, run bodies shaped like doorstops to ensure they have enough downforce to stay on the ground.