jeffbhhs

Hello guys got a question about a stock 27t motor...I am running a Associated TC4 on an oval track trying to improve my top end speed... I am looking to find out what brushes and motor springs work well for you guys... Can you give me some direction on this. I found myself off of the pace that was set by the other guys at the track Right now I am running a 72t spur and a 28t pinion... thanks Jeff