Sounds to me like the Thermal paste is failing on the GPU.
That's what causes the YLOD on the odler PS3s, bad thermal compound, not enough space, and too much heat,
Best to open it up and apply some better thermal paste while you can now.
GT5 is 1 game in a while that relaly taxes the PS3
Good luck using other people's saves in your PS3. They might remove the copy protection but it might be account locked
I'd like to transfer my GT5 save to my other account, the GTP_CoolColJ
since I'm I'm thinking of transfering all my game cars to that account,
but I may have to replay the game from scatch on that account.
Right now I just use to give me more paint chips by gifting cars to that account and back to my main one.
Or I can just gift all the cars across, and just redo all the other stuff, which isn't that hard, just takes time
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Listen to the rev limiter and tell me if it sounds right to you? It changes pitches and slows down as you go up the gears
http://www.youtube.com/watch?v=Xg3c-grhQvU