Rooted tegra 3 devices (cooled - cpu ,battery temp less than 40C)
File Manager with root access
1. Goto /d/tegra_thermal through file manager
2. Give temp_shutdown, temp_throttle rw-r-r permisions and temp_throttle_skin rw-rw-rw permissions (if not same)
3. Modify temp_shutdown through text editor
7. Try Antutu to successfully test modification
WARNING: YOU HAVE TO TRY MANY TIMES TO SUCCESSFULLY MODIFY THESE FILES BECAUSE EVEN YOU SAVE VALUES THEY GET TO DEFAULT SOME TIMES.
Reboot will reset these files again.
EDIT: There is an app called as LGP800 Booster . you can use the app to do the same as stated above
EDIT: Or Download XyrusOS which doesn't need any booster app for full performance.