The two views of our car!
We tried different variations of the gear train and of the wheels. The wheels we ended up using were the originals, though, since the back wheels couldn't increase in size and the front wheel only has an effect when it gets too thin (and wobbles).
Our fastest time was still with the 15x gearing. However, it is obvious that this is too small a ratio, since the car visibly accelerates as time passes. 27x (the next easiest gear ratio) produces a slower car. We attempted to increase the torque by using smaller back wheels (this required the car to be turned upside down and slightly modified), but it was also slower.
Currently, we are trying to create different gear ratios with a 8-16 tooth combination (instead of the 8-24, 8-40, and 24-40 we were using before), but this requires the gears to be placed diagonally to fit on an axle.
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