I am not suggesting converting the IDI engine to DI engine. What I am trying to say is that the engine should remain IDI, but the control of the injectors (new ones of course) can be made by an ECU and that shouldn't cost more than 1.5 k $ (mostly the manufacture of the commonrail. If there isn't one already on the market for a different engine. But if there is it would have to fit exactly. Here I mean the path to the injectors to match, and to be the same length and all that).

And I have to admit most of you are right. If you want to design a commonrail system to sell then it would take a lot of money and time. And that is just because it is not enough to make it work. The one who wants to design such a system must have in mind that there is a whole forest full of stupid drivers, and the system is not allowed to fail even in these conditions. But when you design something for your own use then the task is 99% simpler. Because you know what is in there and how to treat it right. Of course in the first 2 or 3 years there will be a lot of tweaking...but that's just plain old fun