Forza Motorsport 3 has some good simulation decisions, which makes more difficult to handle cars than in other games, like Need For Speed.
At the moment I just finished running with a Ford Fiesta Zetec S, like the one in the picture. Accordingly with the web, this darling has 1.6cc and a lot of horse power.
But then, I own a Ford Fiesta from 2003, with 1.2cc, and I get easier to 180Km/h than with Forza Motorsport 3. OK, I confess I can not get more than 180Km/h and with Forza Mortorsport 3, after being with the accelerator down for kilometers, it raised to 200Km/h. Or that, or I have too much love to my car :)