While there are no traditional "button code" cheats for unlimited money in Gran Turismo 5 on PS3, players can use high-payout race grinds and save file editors to accumulate millions of credits quickly.
: Earn approximately 36,000 Credits every 5 minutes (including loading). Endurance Races (B-Spec) Gran Turismo 5 Cheats Ps3 Money Cheat
Once you reach higher levels, you can enter B-Spec endurance races (like the 4-hour Nurburgring) and let the AI driver race while you are away to earn millions of XP and credits. While there are no traditional "button code" cheats
There is a hidden "Secret" menu in the options, though it is primarily for developers and does not directly grant money. Gran Turismo 5 Cheats Ps3 Money Cheat