Can you get unlimited credit on Gran Turismo 5?

Answer 1

There is no cheat code or direct way of getting unlimited credits, but there is a slightly cumbersome workaround which you could use when you feel like racking up extra credits without having to enter any races. It involves setting up a second account on your PS3 and PlayStation Network, setting your date of birth to whatever today's date is (specifying 1944 as your birth year), and then basically "gifting" your primacy account with a car over and over again that will give you 70,000+ credits each time you sell it under your primary account.