a controller coupled with a user interface together enable a user temporarily to elevate the power curve of motor operation in electric vehicles that utilize pulse width modulation controllers to regulate mechanical power supplied by commutator type direct current motors . the user interface comprises a switch which , in its normal state , allows the controller to operate the motor along a standard power curve that may be optimized to conserve electrical charge . when the user sets the switch out of its normal state , the controller elevates the current limit applied to vehicle operation , thereby enabling the motor to operate along an elevated power curve , permitting enhanced vehicle performance . in preferred embodiments , the user interface is fashioned so that standard operation is the preferred , default mode of operation of the vehicle and enhanced operation will be selected only temporarily and as needed .