Sony have the second video interview with the US developers of Gran Turismo for the PSP.
You can find the first interview with the US developers which was released last month, after the jump, just in case you missed that one.

Although the situation has improved in recent iterations, for much of its history the Gran Turismo series has been heavily criticized for its engine sounds. During the PlayStation 2 and 3 eras, engine notes were often compared to "vacuum cleaners"; the result of synthesized loops that lacked the soul and mechanical violence of their real-world counterparts.
Video games sounds keep evolving with every new generation be it a little or a lot eventually it will get to the point of been inside the race car

Former Sony Interactive Entertainment executive Shuhei Yoshida has shared how his feedback played a role in the success of Gran Turismo.
To this day, anyone that plays a GT game for the first time and doesn't have experience with this kind of game will crash at the first corner, so not really sure what Shu is claiming here. I literally saw this happen a few months ago at an event where they had GT7 with VR2 up on a stage and members of the public got to try it out.

Nathan Williams from Bebington has made a dream leap from virtual tracks to real-world glory, clinching victory in his debut race in the OT Coupe with Toyo
Off topic, I know, but what is the name of the song used in Interview #2?
wow 80 cars from BMW !!!! this is a real deal :) So 80+ for gt5 :D