Be aware of the Bob's personality when you choose them. Bob's with Hot personality will make more errors even in high levels. Once you input speed on hot Bob's (LOL), they will make many errors like spining alot with bad tires. Besides that, you must look for characteristics as Breaking, Cornering and Accuracy. So, when you create a new Bob you must try to choose different characteristics from others you already have. This way you can choose a different Bob when you have to run in a track with certain characteristics.
For example, when you race in a technical track like Côte d'Azur, your Bob must have high Breaking, Cornering and Accuracy. Meanwhile, if you have to race highspeed tracks, try to use Bobs with high Strength and Mental Strength.
A little resume (from
here):
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Braking: In arcade racing games you might hardly touch the brake, but in GT5 the braking skill is very important for Bob. If Bob doesn't know how to brake properly, he'll enter a turn too fast and will spin out even if his Cornering stat is high. A good Braking skill also ensures that Bob controls his slow-down enough that he's not overdoing it and leaving the corner slower then he needs to.
Cornering: Cornering and Braking go hand in hand. Spinning out is never a good thing, but if Bob takes a turn too sharply it will happen every time, costing you valuable seconds getting your car stabilized or back on the track. The higher your Cornering skill, the faster Bob can take corners and improve his Driving Line throughout the course.
Accuracy: Accuracy is your ability to stay on target. While Cornering will determine how fast you can take a corner, your Accuracy stat will determine how well you are following your Driving Line. Just because Bob can take a corner a little wide doesn't mean you want him to. This stat also determines Bob's ability to navigate between cars for passing.
Stats That Change During a Race
Strength: Strength determines just how long Bob can drive. During the race you will see Bob's Strength stat constantly going down. Driver CreationThe higher the Strength stat, the less likely Bob is to make mistakes. Strength is also a skill that will decrease near the end of your racers career. Once you see Bob's strength stat being grayed out, you'll know that you'll need to start training a new Bob or two.
Mental Strength: Mental Strength is how tough Bob is mentally. Things like being stuck in a certain position for a long period, being lapped, getting into a crash, and how low your physical strength is getting all have an effect on your Mental Strength. I've found however that the largest factor is how low your Strength is getting during the race. The lower your Mental Strength, the more likely you are to make mistakes like bumping into other drivers or spinning out in turns.
Personality: The Personality trait determines how Bob acts while behind the wheel. A Bob thats very Cool will not be bothered as much by changing conditions and will slowly determine the best thing to do. A very Hot Bob will, in contrast, make more snap decisions and fly by the seat of his pants. How this plays out during the race is that the hotter Bob's personality, the more rapidly his pace changes during the race, whether he's affected by how close cars are to him, or to the commands to increase or lower the pace you give him. If you like to have a Hot driver, you might want to focus on the Accuracy skill as he'll want to pass often, and you might consider Cornering as your high stat if your Bob is Cool.
Experience: While not a stat you can change, Experience is very important. When starting out, Bob doesn't really know what he's doing. He doesn't know the tracks, he isn't used to the cars, and he's not used to passing other drivers. As you drive more cars, drive the tracks, and get used to racing overall, your experience will go up. Bob will take corners better, be more accurate in his driving line, and know when to pass others."