B-Spec is very useful if you need to get money and experience (GT5) quick. B-Spec was introduced in GT4 and provided players with a another option besides A-Spec.
B-Spec allows the player to direct a driver around the specified course, has five pace options, and two other options. The left and right buttons control the pace, the triangle buttons controls the overtaking, and the circle/"O" buttons controls if the player wants the driver to pit.
B-Spec is often used in endurance races (Like the Nürburgring 24-hour) because the player can leave the driver to race.
When the display screen is shown, the player is able to speed up the race a maximum of three times with L1+right. This speed lasts until the player slows the race down or if the driver enters the pit stop.
Winning a race in B-Spec will award the player with B-Spec points, though these have no effect on the game progress except for the AI driver getting more skilled.