hello!, i have had a TT-01 chassis for a little while, and when i started to race it i discovered that it was like a snail to the ones with the Schumacher chassis and other expensive ones, so i decided to get a [lot of ] upgrades, and they are a high performance 27 turn motor, an acoms AT8 speed controller, ball bearings and a 21 tooth gear for the motor, and when i only had these the stock tire's were ripped to shreds and the plastic prop shaft nearly shook itself to death, so i also got an aluminium prop shaft, some performance tyres [that are now quite worn out ], some cooler looking street tyres, adjustable steering and 2 cool shells, a green with white stripes ford gt, and a hotbodies mazda 6 and it now is fine, apart from the range from the reciver has halved, and when it is a bit out of range, it stutters untill it is a bit closer, and the motor used to make a horrible squealing sound and smoked slightly, but i changed the angle and it doesn't do it at all now, i am just wondering what that is