How to Tune a Car on Gran Turismo 4

Select "Buy Parts" from the Gran Turismo main menu. Within game menus, use the directional pad to move the cursor on the screen, the "X" button to accept your selection and the "O" button to cancel your selection.

Purchase the automobile parts necessary for customized tuning. For instance, if you want to tune the brakes on your automobile, you must first purchase the Brake Balancing Controller. To customize the drive train, you must first purchase the Fully Customizable Transmission. Read the description under each part to determine if you need to purchase it to enable tuning.

Select "Tune Car" from the main menu to enter the tuning interface. Select the part of the car that you would like to tune from the list on the left side of the screen. For instance, you can select "Tyres," "Driving Aids," "Downforce" or "Weight Distribution."

Adjust the tuning of each individual component using the on-screen sliders or option boxes. To use the sliders, select the slider with your cursor and press the "X" button. Push left or right on the directional pad to adjust the slider position. Press the "X" button once more to save your settings.

Utilize the on-screen graphs and data charts while tuning your car. These charts display weight ratio, acceleration data, gear ratios and other vital information about your car's performance.

Select the "Save Settings" button when you are finished tuning to apply your custom settings to your automobile.