turbo timer gives u the convenience of having the engine on to let it cool down after taking out the keys and locking the car
if u don mind sitting in the car n wait for a while,then no turbo timer also can ma
well at least i did tht for more than half a yr after transplanting,no budget to buy timer tht time,so everytime after stopping,i'll sit inside the car for say 10-15 secs lo,depending on how far u've traveled,n how did u drive,if revved kao kao before coming to a halt,then better leave it on for a longer while