I used the Furai yesterday with all upgrades and failed miserably @ Indy.
So today I decided to get my everyday car, a Mazda 787b Stealth with all upgrades and Soft Racing Tyres. I crushed the competition by quite a margin, however the only con using the Mazda is that you have to let go the throttle at every apex, losing a bit of speed. However the sheer acceleration of the thing is just nuts, I was in 2nd going out of the first turn and 1st the next.
I won the Daytona race quite easy too and got the Minolta. I upgraded all the Turbo Stages and the body as well and went for a spin @ Indy. The result is insulting to all AI drivers, the Minolta might not have the acceleration of the 787b but you don´t have to lift the foot off the gas pedal at the apex, it just goes on rails.
I did the race in 3.24 with the Minolta and the minimum speed per lap was 355 kph...