The Avtech WX-3 is a prototype supercar engineered, created, and constructed by Vector Motors of Wilmington, California in 1992. Conceived by Vector Motors founder and chief engineer designer Gerald Wiegert as a successor to the Vector W8, production plans for it included a range of engines ranging from 700 hp up to a 1200 hp (746 kW) from a proprietary 7.0L DOHC V8 motor. Originally painted silver, the WX-3 Coupe prototype was later re-painted teal. The single finished prototype is powered by the same twin-turbocharged engine configuration as the W8 prototypes, with an improved flow dual plenum and throttle-body intake tract rather than the Corvette-based system used on the W8 production cars. At high boost levels it is capable of developing 1,200 hp. The WX-3 has A three-across seating arrangement that was an option on W8 export models.
Wiegert had also planned a roadster version of the WX-3, named the WX-3R; both vehicles shared all mechanical components. Like the model it was based on, the WX-3R did not pass the prototype stage. Both versions were shown at the 1993 Geneva Auto Show.
Wiegert planned for the WX-3 to enter production in the 1990s, but after a hostile takeover initiated by Megatech, Wiegert was fired from his own company. The car was never produced and later removed when Wiegert initiated lawsuits and copyrighted the designs, preventing Megatech from building and selling the car without his approval.