i have a leaderboard car a chevy spark for f class. I can't get it to go as fast and keep up with other sparks racing. I've tried upgrading for horsepower and handling and tweeking the tunes such as brakes and gear ratios and have used the tuning calc to set the parts. I set the gear ratios for the longest straight on a track so it is about to redline in the highest gear on leaving the straight. Any tips or help would be greatly recieved. Maybe some advice on which upgrades to use or anything i am missing!!!!