T-80B had a new turret, fire-control, and autoloader allowing the firing of 9M112-1 Kobra antitank guided missile, and improved composite armor. An improved 1,100-hp engine was added in 1980, a new gun in 1982, T-80BV fittings for reactive armor in 1985. Reactive armor adds protection for 400mm equivalent armor to defend against HEAT warheads.