Well the reason(s) is/are very simply:
1) I'm very frustrated of that 'modders' nowadays live about converting cars from a great game - and making 1 million modifications about that serie. And then, they state 'my mod is real', and 'I will give it for real drivers to test it', and blablabla.... and then, on some websites, which is dealing with sim games & its modifications, give them too much advertisement - while those teams, who made 100% legal work, don't get enough advertisement. I know that RaceDepartment isn't in this part of the sim community, but, you know, it's really frustrating me when I see the simulator websites of my country, and what's happening there. It's really-really demotivating for me, at least.
2) This will be the main reason: I've got a theorem, which I broke. The theorem is the following: "I do something properly, or not at all - but I won't give it to the public if it's bad." And, well, the physics is wrong from the basics... Earlier, when I started to work on that, got some tips of Gergely Bári, Michelisz's race engineer, he said that these new engines are "power holders" - and, I was so idiot, and I don' know how, but I thought he told me earlier they're "torque holders", and that's why the cars were behaved very-very strange.
So, you'll probably find me an idiot; but I don't want that people identify my name with a bad work, whereas I can do much better than that - so, that's why I would like to delete it.
Probably, one day will correct it, until that I don't want to burn myself and those guys who helped me a lot, with a bad work, because I was so silly.
@
rob Shilito: yes. But only I will delete those links which I've uploaded - in the future, I don't care if somebody will upload it onto file sharing websites, and then he or she will share it with the others.