Problem speed passion

[alexb4]

Hi there Bought a speed passion feaigo a couple of months ago checked it worked in my house and it was fine. Ive been just using my other car so not used the speed passion. A few laps into practise on last friday i put the brake on going into a corner and it shot off in reverse raming up aginst the wall with the wheeels spining turned the car. Checked it over all seemd fine diff fine. Later put the car down driving slowly around in circles and up and down and the car starts making lound noises asked a friend and he told me the diff felt fine and that it was the motor or speedo, swapped the motor yesterday and still having the lound noise after about 2mins up and down the road. So its got to be the speedo any sloutions all i can think is new software but where do u get that done ?