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i think you are being way to ambitious. I mean hey theres nothing we can do to stop you from screwing up your xmod and wasting your time on whatever you want but if you stop to think about it IF you can actually get a two speed in a car this small (and thats a very big if) it wont help it anyway.
The only way it would help is if you, for some reason, wanted to start your car off slow and then gradually get faster. Because electric motors have all their torque and speed at 0 rpms and since the have no power curve all you would be doing is slowing it down. And as for the emaxx having one it is much much larger than an xmod and has much more powerful motors that need a two speed to keep the tires from spinning.
Also another thing that contributes to tires spinning on the emaxx is that they are pneumatic. The tire can flex and twist on the rim. With an xmod the tire is a round piece of rubber on a plastic rim with no space between. Getting a tire like this to spin would require a pretty large around of force unless of course you were on a surface that its not designed for (sand, loose dirt, stuff like that)
and i agree that two of those motors on a car that small given the right power supply would probably give some pretty nice speed but now since they are higher up it will raise the COG and arent you planning to only run one at once? like a slower one first then switch to the second one?
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