I sent the same question to Mike and this is his reply:
Quote:
> To get 40 mph with 12 cells and the 8xl motor, you will need a different
> spur gear(Traxxas makes a 54 tooth spur) and around a 20 tooth pinion with
> freshly peaked batteries. The motor and controller can handle it no sweat
as
> well, as long as your batteries can.
>
> Mike
> RC-Monster
> www.rc-monster.com
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His proposed 54/20 ratio is even taller than 66/20 ratio that was proportedly too high.