I thought a coil pack was a transformer full of copper coils, but i'm not sure. My understanding was it was a step up transformer. 12v - 20kv. As it is designed to operate at this parameter if you increase the input, the output will also increase untill it reaches it's threshhold and not increase any more due to losses. As you increase voltage you'll increase resistance and heat, and lower current. Not sure how long it would last if you did this.