I've looked around the net quite a bit. I have not been able to find a dc-dc anywhere near what you'd need for a car application. First off, nothing will bump your voltage up to the 144V+ that is needed to charge a car's pack. Second, they don't supply anywhere near the power that the enginer dc-dc converter does.
I'm sure you could contact any company that makes dc-dc converters and they could make you one, but you'd be paying a very high price for it.
Its sad to see enginer go out of business. He had a good idea, too bad he just had so many problems with it. The website doesn't say anything about going out of business. Where did you hear this info?
DIY is definitely possible, just start reading up about how to build your own dc-dc converter. The concept isn't complex, but it seems controlling everything makes things quite a bit more complicated. I have looked into this a little bit as well.
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