Real techniques won't help you much on Nascar 09.

Splash out on a copy of NR2003 if you want realism! I haven't played Nascar 09, but I'm having a lot of fun on 03, and I'm told the physics are quite a lot like iRacing's.

Well okay the physics aren't perfect, but I have been informed by numerous people that they are thousands of times better than EA's! There are a lot of great mods as well, I've downloaded a
lot of stuff, and guess what? It takes up 1.47GB!
There are probably quite a few torrents as well, but don't tell anyone I said that!

It is a bit pricey tbh.