So to be honest, I'm not a NASCAR fan, I haven't even heard of any of the people you're talking about in here, but you're descriptions make me feel like I know them personally.
I like the romance between Amber and Martin, it adds to the story. You haven't gone into to much detail with driving terms and stuff, so I think that's pretty good. You could have easily lost me in there and probably some other readers if you had!
As far as I can see you haven't got any huge grammar or spelling mistakes, none that I've noticed anyway, so that's good :)
I'm pretty sure I'm going to subscribe just to see how this all plays out, you've got a very interesting and strong piece here, keep it up!
Ok:) I do like this story, its quite interesting! First off I'm not a NASCAR fan at all and I have no idea who these people are but so far your descriptions and the way you write this makes it seem like I do know them and I like it! Your writing style is pretty simple and I like the fact you haven't gone into too much detail with the NASCAR terms and driving technical words which is SO good because that would have lost me and made me very disinterested so yeah - well done! Keep it up and I think I may subscribe to see how Tony reacts about Amber and Martin:)
First off, I am a huge NASCAR fan myself! I haven't read any fanfiction on it before so I love that this is something new! I really enjoyed the relationship between Martin and Amber, and the romance building slowly really adds good structure to the storyline. I like how the NASCAR theme really is well used; it isn't too wordy and lecture driven, but still gives the readers enough information. I can't hate on anything NASCAR, so good job! :)
I like the layout a lot. The background is neat and the banner is clean and eye-catching. I have to be honest, I've never read NASCAR fanfiction before, so this should be interested.
I like that you give us a lot of information about this world and how it works with the dialogue at the beginning of the first chapter. It's natural and it helps us understand but it isn't just a pile of information because it's in the dialogue, so good job.
There are a lot of grammar errors with the dialogue, and I'm having trouble getting past those since I'm a beta and I read stories for errors all the time. You might want to address those errors.
I like that the story slowly builds to the romance and you're still really doing a really great job of getting all this background and situation information across without me feeling like I'm being lectured.
Overall, this is really interesting and besides the grammar errors, well-written with good flow.