The next thing you can do is improve the gears. Your normal car runs faster in 5th than 1st right? And so will your Scalextric car runs faster with different gears. Gears change one rpm at the engine to a different rpm at the wheels. Now you can't be in the cars changing gears like your normal one so the so have one set installed. But you can pull them out and install a different set. If you're old gears meant that one revolution of the motor turn the wheels twice and your new configuration means they turn four times then you've just doubled your car speed! Be careful though, your motor only has some much torque/ power so if you gear...
