Poor car performance could be the result of any number of reasons. Here are a few common problem areas.
Wheels are not installed straight and parallel.
Car is not the maximum weight allowed per race rules. Heavier cars go faster.
Verify that the majority of your weight is toward the rear of your car.
Wheels and axles are not tuned and polished. This lessens friction.
Wheels and axles not lubricated with graphite. Also lessens friction.
Bottom clearance not adequate and car drags on track guide.
We recommend purchasing the PineCar How-To Book: Design for Speed (P383). It walks you through the entire building process, starting with cutting the basic block and finishing with race day check-in.