Did the Sardegna 800PP road race with the stock tune (got it down to 800 with power restrictor and ECU dialed down) and it drove very nicely right out of the box. Would be interesting to hear what others think. Won the race easily, but that was on easy setting.
I did the same - no changes except power reduction. It drives well, and won the Dragon Tail and Daytona 10 lappers pretty easily on medium difficulty. Even with more economical fuel mix, it's faster than the AI cars.
