I'll approve this post for the off topic section because there's no link to a purchase of the app, but this thread has been flagged.
Although this is not directly relating to writing software for cars, I thought you guys might be interested.
Myself and a friend are working on a car company tycoon game. A game entirely dedicated to designing car engines, gearboxes and cars to sell to various simulated demographics.
We have been working on it fairly solidly for about 18 months.
Here is a video of building a car from start to finish:
I hope it piques your interest.
Pretty cool. I'd play it.