[3] The PC-27 made its debut at the first race of the 1998 season, the Marlboro Grand Prix of Miami Presented by Toyota, Unser Jr retired with a broken transmission and Ribeiro finished 17th.

Both drivers retired at the Toyota Grand Prix of Long Beach, Unser Jr had contact with Hélio Castroneves and Ribeiro with an oil leak.

The Brazilian failed to qualify for the Bosch Spark Plug Grand Prix Presented by Toyota and the American finished 15th.

Both drivers retired at the Chicago Tribune Presents Texaco/Havoline 200, Unser Jr had contact with Patrick Carpentier and Ribeiro with engine failure.

Both drivers retired at the final round of the 1998 season, the Marlboro 500 presented by Toyota, the Brazilian had contact and the American with an oil leak.

The first race of the season was the Marlboro Grand Prix of Miami Presented by Toyota, Unser Jr crashed and broke his leg.

Two PC-27Bs were entered for the American and the Brazilian for the Grand Prix Telemar Rio 200, with Marques finishing ninth and Unser Jr 12th.

The PC-27B returned at the U.S. 500 Presented by Toyota with two PC-27Bs entered for Unser Jr and American Alex Barron; engine failures put both drivers out of the race.