Yeah, that's a very good style to have. Mine is kind of similar to that. I also try to break up the race scenes, with friends and observers talking about what's going on, and highlighting strengths and weaknesses on the parts of both cars and drivers.
I used to have everyone's thoughts in italics, but some folks said the italics were annoying, and there were too many changes in the point of view. I posted part 1 at a writers forum, and they liked it, so I'll just stick with what works. I'm planning on posting part 2 there soon.
I read a lot of British car mags, and that's how I learned about the Vantage 600 in the first place. It sounded like a great car to use, and with so much weight, it could show a lesson too. I mean, you don't exactly toss a 4350lb car around the turns.hehe
Alec, the owner, also took the car to Aston Martin's Works Service in the UK and had some custom work done. Carbon fiber front and rear bumpers, a titanium rollcage integrated into the interior(almost invisible except for crossbars), revised engine management, and some suspension work. The Vantage is making ~650hp and about the same amount for torque, now.
Alec talks about this stuff over brunch after the race, and how the people hated how he wanted such difficult stuff done(ex: titanium cage. Titanium is hard to weld, and even more difficult to bend.), until he paid them.

The brunch scene will be nice for falling action after the race, and sets up for two other races. It should turn out to be pretty cool/funny.
Have you tried using maps of the places you want to use? I haven't driven HWY 359 in Brookshire, Texas all that much, but I still wanted to use it for the Aston Martin race. I went to Yahoo! Maps and made a map of the route, and that helped refresh my memory a bit so I could keep writing. It even helped me find a few other roads I might use later.