Next 2 companies are bringing out digital radios with tranceivers that fit in your car. A transceiver gives you the abilty to send and receive information from your car. With dumb sensors and a very smart radio, you could easily control a fuel injection system. For racing, the fuel injection should mainly act on throttle, rpm and manifold pressure. No need for start up and the complexity of controlling the injection would be in your smart radio which has a LOT more space for a better/faster microprocessor. Only after transceivers are common place, will we have relatively cheap fuel injection.