Trouble with Gran Turismo (sim disc)

Just downloaded this rom and I can't seem to get it to work on my PSP. I usually drop the rom's folder into the "game" folder on my psp. Is there something I'm missing here?There were 3 files with the G.T. rom... a .ccd, .img, and .sub file.Thanks to anyone who can help me here!

PSX games need to be converted to work on a psp.You need to read this and google for the tools...https://www.romulation.org/forum/index.php?topic=9995.0

thanks for the speedy reply!

Replying to #3

I live here practically XD(I bid good luck-I got it working-but let us know if it doesn't play like it used to...it might play too fast or too slow...at first)