Arduino BT and ITG3200 Gyro

Im using the following sourcecode on my arduino BT atmega 328. I get Datas but I think the datas are not exact. It seems like the sensor is more sensitive compared to a very similiar sourcecode which I m using on my arduino dumilanove.It only takes a short move of the sensor and the Z axis of the gyro shows a full scale of 2000 degrees per sec. I power the board with two 1,5 V batteries. thx greets Kris

The full skale range of each of the axis (I turned) were reached after a short moment .