Hi!
I just visited your site and well, I think it still has a lot to improve, but I think it great that your traffic is improving! Personally, I don't like the dark color (but maybe its because I'm a woman
) and the small navigation bar at the top is really difficult to read. Also, keep in mind that internet readers follow a certain pattern when looking for information from the internet (generally an F-pattern). This means, you should put all the important information at the top, or if you can't do it, then atleast put a way for them to "act".
What is your goal for your site? Do you want to get more readers and commenters on the forum? Do you want more people to buy nitro rc cars? Putting that big banner in the front page is a good thing, (but it doesnt work for FF.) Also, try to put all important info above the fold. If your goal is to earn from this site through ads, then put ads above the fold.
Hope that helps!