I found [this][1] really good tutorial, but its german ... I translate: 

1. prepare phone, go to settings > apps and disable "fastboot".
2. shutdown phone, completely (if you want to be safe, remove battery and plug it in back)
3. Boot into fastboot mode (press and hold VolDown + Power)
4. plug usb to phone, windows will show up a new device. If the driver is not installed properly, install it via device manager (Download driver [here][2]). Now the device should show up as `Android Sooner Single ADB Interface`
5. Download [this][3] and navigate to `RecoveryClockmodByZaDkYn` and start `Instalador.bat` 
6. Now open a command prompt, press any button. Now the progress is started. If its finished, press any button again. 
7. Now you have ClockWorkMod installed, download [this][4] file, copy It to your sdcard. Boot into CWM, select `install zip from sdcard` and chose `chose zip from sdcard` select su.zip and press power to flash it (you can navigate in the cwm with volumeDown and Up)


  [1]: http://www.android-hilfe.de/root-hacking-modding-fuer-huawei-ideos-x3/145672-how-root-your-ideos-x3-clockworkmod-recovery-systemapps-entfernen.html#post1983531
  [2]: http://www.multiupload.com/GARUVWWK2B
  [3]: http://www.multiupload.com/W2C7GQVSYI
  [4]: http://www.multiupload.com/1OWX8ALRY2