Sensorvalues per wireless

Hello, We are currently working on a project with the MIND FLEX.
Description: http://frontiernerds.com/brain-hack Everything works so far, we can already bring with Headset values ​​a lamp to light up.
We use the Megaboard 2560
We now want to bring a car to drive to the motor Shield For example, over the sensor values. (Ex .: At high effort it should move forward with less backward, etc.)
However, if we combine our Shield with the motors
our Headset doesnt work and give wrong results.
We do not know why this is, our guess was possibly a battery problem. (If someone has an idea to it can also like it already answer).
So we wanted the values ​​we get read, transmitted to the motor shield by radio, and the motor shield would be closed separately to a battery. Does anyone have experience with sensor values ​​and radio transmission and can recommend a device and might explain how you would proceed.

However, if we combine our Shield with the motors
our Headset doesnt work and give wrong results.

Probably a hardware or software issue. You've posted no links, no schematics, and no code.