GX beta cup faq

I'm using a gecko cheat code on a softmodded wii in order to play the story mode tracks in practice/time attack mode.

In order to load gecko cheats onto gamecube games, I followed this guide:
http://vggts.macrosonic.org/where/wiird/gamecube_codes_with_geckoos.htm

This is the code I use (for NTSC-U only):
Access Beta All Cup [wParam]
48000000 800030C8
DE000000 80008180
1224546C 00000000
E2000001 80008000