The stock 13 turn car really has very little to change, the mod is a different story!
If your struggling I can send you some of mine, or you can search the track tips posted on the site, there are plenty to choose from there.
Maybe we could organise a multi player session, all we need to do is set a day and time and do some real time racing
My connection and pc will allow me to host a race of upto 7 people at any one time.