personally for tight tracks i would opt for a ratio of around 7-or-low 8's (smaller pinion) rather than 6;1 to give you better acceleration. 6 would suit outdoor tracks better & if you run a bigger pinion you are gearing for top speed more than acceleration so the motor will be working harder & get very hot (which causes damage to the motor & can affect performance) or even themal out your ESC. A lot of people are actually making gearing changes based on motor temperature, hence why this is one of the reasons you often see people using temp sensors straight after a run & pointing them at the motor.
The golden rule is you want to try to reach top speed before the end of the straight just before you need to back off or hit the brakes & the motor should not be so hot that when you touch it you end up burning your fingers & you can actually hold your hand on it.
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