If I'm being honest, I 1000% agree with Julio in telling you that you're going about it all wrong. You have to do 10x more FOR the sponsor than they are willing to do for you BEFORE they'll even consider you. With a half finished car, that will also make your possibilities even harder to find. Sponsors are NOT about financing YOUR project. They are about getting more exposure for THEM first and foremost.

You really need to adjust the attitude or you'll be left just "wishing" rather than doing.