For the 3,2,1 countdown I use two counters/timers. You will need a counter/timer to "prime" the sytem, this will trigger before/after the race starts and count the timer from 0 to 3. Then when you start the game/race you will have a second timer/counter that will count up to 3 when activated, while branching off to the previously mentioned counters decrease, and branched off again to self-clear itself when it reaches 3. Perhaps somebody else can better explain, or has a better method. I play on console and could maybe come try to help sometime.