Turn the damage ON and the engine breakdown to on. If the race starts, turn around and go the "wrong way." Then get some speed around 150 mph above. Crash into a car and your car will be sent flying!

Not really a hint but very fun to do!

I've finally done it! After 2 years of work I've unlocked the 4th from the Sun Interplanetary Speedway. First, you need to win every championship, except the Custom Season. After that, you need to complete the Thunder Card challenges until you eventually get the track card that says "4th from the Sun." It only took me two challenges of Speed Demon, Part 1 to get it. This track is a 2-mile oval Speedway similar in shape to Daytona Intl. Speedway. The turns are banked 18 degrees, the frontstrech is banked 12 degrees, and the backstrech is banked 5 degrees. This track is unique in the fact that it's on Mars (obviously) and that due to the decreased gravity on Mars which the programmers factored in there's an estimated top speed of 225 mph, with an accelleration of 0-60 in 1.5 seconds. The actual track is a green substance of some sort and is about as wide as Talladega. The infield is an orange-red dirt which is the same color as the retaining wall. The auidience is also this color, since they're Martians. It's very hard to get the pole, but nevertheless, this is a fun track to race on.

After beating championships, you will unlock secret tracks. Here they are:

Superspeedway Shootout- Cocoa Beach.
Short Track Challenge- Devil's Canyon
Road Course Challenge- Boca Chica.
Full Season- Albuquerque.
Full Season W/F- nothing.
Custom Season- nothing.

Note: You do not get anything for beating Full Season W/F. I know because it was
The first season I beat. You can also get tracks with certain Thunder Cards.

P.S. I don't know how to get 4th From the Sun Speedway. Will someone PLEASE answer my question about it if you know how.