Your selection should depend on the size motor that you intend to run in the car. The smaller .12 and .15 size engines do fine on the boxes with the 2 540 motors.

For the larger engines like a .21 I would go with the larger single 12 volt motor (1/8th scale box). I have used both and the larger motor puts out a lot more torque to turn the bigger engines over with ease.

The only drawback is that the larger box is just that, it is a lot bigger and heavier so this adds to what you have to carry to the track or parking lot. If that is not an issue then the choice is clear in my opinion.

If weight and space is an issue as it always has been for me, then keep in mind that you can run the 2 540 motors with up to 14 to 15 volts which will give a lot more push on the wheel.

Also be sure to check that your model is compatible with the model you are buying or have. Some models do not work with starter boxes.


Dbow