Wait until you have purchased new upgrades for your car before entering the race arena . The match making system pairs cars with similar values, without taking upgrades into consideration. Examine a car's value by looking in the top left corner before challenging it. Try to find cars with lower values than yours, as this usually means less horse power and an easier race to win. If the bet is too high and you are not confident that you will win, do not start that race. Only participate in races you are sure of winning.