Once all the Normal Level stages have been completed, you can add 10 Million credits to your GT3 game data. To transfer the money, select the second prize from the right on the Game Status screen and follow the on screen instructions.
Once all the Normal Level Stages have been completed, the Japanese opening movie of GT Concept can be viewed by selecting the left hand prize on the Game Status screen.
Highlight the "Hard" selection on the difficulty selection screen. Hold L1 + R1 until it changes to "Ace".
Successfully complete the Toyota Pod Event.
Extra credits for Gran Turismo 3 A-spec:
Complete 50% of the races to unlock a saved game file with 1,000,000,000 credits for Gran Turismo 3 A-spec.
Bonus FMV sequences:
Complete 100% of the races to unlock two FMV sequences.
please note:this is for if you have selected automactic for your type of gear changing
now this is the same as GT:3 method for controling the gears in automatic hold R2(R2 being default Gear up)and let it build up to the red bit in the speedo then let go and just repeat