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Try to do something with no controller. You could have a sepex hardwired to spin around 2000 to 4000 rpm, and have to start by clutch slipping, and change speeds by shifting and binary pedal control (on/off).
Another thought is to do a series motor with a really big, heavy flywheel to give you time to engage the clutch before the motor spun up fast enough to spontaneously disassemble.
Batteries on the floor beside the driver, with a jumper cable, makes for the cheapest switch, plus the bright flashes of light helps to warn away other drivers, who you'll now have trouble seeing anyways due to these bright flashes of light. Of course, safety first, be sure to wear safety goggles and to cover the batteries with a tarp in case they explode.
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