Nothing. Autocross is the generic term and Solo is the brand that the SCCA uses. In conversation you’ll hear Autocross and on official items from the SCCA you’ll see Solo.

Pretty much any car is legal for autocrossing, convertibles included. The only restrictions tend to be with vehicles that are tall and have a high center of gravity. If you want to verify if your car is valid. Post a question to us or check out the official SCCA rules to see if your car is in the listings of legal vehicles.

Also note that all vehicles must complete a pre-race technical inspection that covers basics like having your battery securely fastened, having wheels firmly attached other safety items like seat belts, and brakes. For details on what is checked, read this: Vehicle & Helmet Requirements

That question is pretty simple if your car is stock but aftermarket modifications complicate things quickly. Check out our Car Classing Guide for a high level overview and what to do if you need help figuring it out. The most common question for people starting Autocross and bringing in a vehicle they’ve already modified: “Is My Car In Street Class?”. We try to give a high level answer in a section called Is My Car In Street?

CCR has loaner helmets available, we ask that if you do borrow a helmet that you please return them after you take your run, since we have a limited number available. If you’ve decided it’s time to get your own, check out the requirements here: Vehicle & Helmet Requirements

We’re kind of an odd bunch.