I have a friend that races a 142 that had the D jettronic system. He found a company in Manassas, VA that manufactures a programable system. After a race, he just plugs in his lap top computer and downloads the stored data. He can then can rework his program and reload it to the computer in the car. According to him, he can control the timing of the injectors to include duration, ignition timing and the maping of the fuel curve. I know he really likes it. I have no idea of the cost but if you are really interested, I can contact him and get additional info.