With the combined running of the GTP ZX-Turbos and NPT-90s, as well as the performance of privateers Jim Busby and later David Seabroke, Nissan would once again easily take the GTP constructors championship. Geoff Brabham would take his third drivers championship as well. One GTP ZX-Turbo would be entered by John Shapiro at the Miami round in 1991, finishing 13th before the team would fold. This would be the final race by a GTP ZX-Turbo car, although the NPT-90s would continue to carry the GTP ZX-Turbo name on them.
