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Got two zipzap's, a 27Mhz and a 49Mhz. The 49Mhz one doesn't work, the question is can any parts be used from it to make the 27Mhz one any better, mostly looking for performance. The 27Mhz one had duel motors for a while but got bored of it. Does anyone know any mods that can be done to the 27Mhz car with the parts from the 49Mhz car? The only thing thing broken on the 49Mhz car is the controller (charger still works). Thanks.

a dual cell is the most obvious choice.

anything else and is there anything to make to hook up to the charger that will tell you when the car is charged?

anyone have any other ones?
and is it poosible to fix the controller cause everything is perfect except the controller got to much power and died.

Yes,
if you have a old wall plug style charger ,like frim an old cell phone or drill... you can clip the end and strip it and solder it on the terminal area's on the broken control

Shane