Two companies are coming out next year with a DSS( digital spread spectrum) digital radios that allow two-way communication with your rc car. This technology is a 100 times more complicated than electronic fuel injection and the initial modules will be under $200!!! If their is no demand, engine makers will not produce. It as simple as that. The parts to make fuel injection a reality on an rc car are dirt cheap. Its the software
and the hiph rpm injector that would cost money. Full scale car injectors are well under $500 each. Evem starting with an electronic fuel regulator that acts like a variable needle would not be that expensive. All sensors required are readily available
Engine makers are not motivated because of lack of demand.
With no need for constant engine tuning, I am sure a hell of alot more people would buy an rc vehicle!!!