I hired 35 designers, to speed up my car development. Unfortunately, I discovered that I might as well have worked with 10, because the amount of designers you put on a part doesn\'t seem to affect the speed with which they are developed. A part which has 15 designers on it developed as fast as one with just 1 on it. That doesn\'t seem realistic at all :-(.
A few people in my league also wondered what driver weight had to do with the speed of the car, as there is no balance option in the setup screen (as far as I know at the moment). But that was just a little question.