Cheats for NASCAR 98 on PS1.
Pause the game while in a race, and from the pause menu go to race statistics. Hold L1, L2, R1 and R2 all at the same time until you hear an engine sound. Then when you go back and resume the race you can shoot paintballs by pressing Triangle.
Go to the Game Options screen and hold Circle, then press Up, Left, Down, Right. You will hear a confirmation sound if entered correctly, and see a new turbo mode option will appear at the bottom.
Bonus cars in Single Race mode:
From the Main Menu go to Single Race, then at the Race Setup menu go to the Select Car option and enter one of the following cheats:
Unlock the EA Sports car: highlight Kenny Wallace’s car, then hold X and press Up, Down.
Unlock the Pinnacle Trading Cards car: highlight Bobby Labonte’s car, then hold X and press Up, Down.