Bought 2 thunder tumblers and one remote control makes both cars operate make racing and two people operating each operating thier own car (playing together) impossible. waht can i do???

The frequency cannot be changed in the cars. The frequency is set, you have to buy two different frequency cars. There are stickers on the cars, and there is also a label on the outside of the box. The frequencies are 27 and 49, we got two 49s, so we ll have to exchange one.

Type the thunder tumbler in Fixya's search. This is two way radios. There are a LOT of posts on your RC trucks. If new, I suggest you return them.

Use the throttle trim control to try and adjust this unwanted throttle application out. Refer to the user manual on how to trim the remote functions

You can't change their frequency, you have to but a car with them designated, black ones a 47 and red/blue are there 26 or whaterver.

They are running the same radio frequency signal!

take out the batteries of the other car and don´t put them back in

Most of the store bought RC cars support a few channels and autoselect the channel or they are tied to the controller. Some of the better (hobbist) RC cars have a channel select on the underneath. You could check for that but if these are the 9.99 stocking stuffer specials, you may be out of luck.

try contacting the company. if the car wheels are broke or dangeling you would need new wheels. if the wheels arent the problem it could b the turning starvos

The box shouldn't say "two frequencies for competitive racing." That is misleading.

MAYBE YOU SHOULD TRY TAKING IT BACK TO THE STORE AND TALKING TO THEM ABOUT IT OR YOU COULD BUY A NEW ONE AT AMAZON .COM FOR $11.95
HERE IS THE LINK FOR MORE DETAIL:
http://toys.wslrss.com/?s=THUNDER+TUMBLER