Turbo, it seems, was tailor-made to appeal to a large population out there who are NOT motor-heads.
This movie is for children, and the adults who still acknowledge the children in themselves. It's a fairy-tale like approach to matters that are mostly conceived to be only appealing to the same fan following that obsesses on Fast and Furious and Need for Speed. Take a garden snail who is demoralized by facts of nature that limit his dreams of racing, watch him be hustled under the hood of a car and into the revving, spurring, roaring motor parts unbeknownst to the average young viewer during a race, and watch this tiny creature be washed by a shower of Nitrous Oxide; because every noob knows that that's the only boost you need for your car to jump over retracting bridges.
And there you go- you have a supernatural superfast super-shocking tiny super-garden snail.
This snail named Theo, a.k.a. Turbo, finds an equally deluded human being who thinks that Turbo's speed can get him into a major racing tournament for cars- the Indianapolis 500- and turn the attention of the world to the run-down strip mall that he, along with his brother and his friends run. The rest is for one to find out in the movie, which is quite entertaining with its sense of humor, stereotypically designed characters, and an unreal fascination shown by a group of miniscule snails obsessed with speed and racing. Despite a very predictable plot which is not something young viewers care about, this movie draws the viewer very well into the world of racing and passes motor-knowledge on very easily and almost stealthily. This is a movie that motor-head fathers could watch with their little kids to pull them into their obsession, without having to hear them whine (in case they're daughters).