Yes, If the car that a User adds, that DOESNT have a lap, a Simple delte should be made, I Think the Right thing should be to Delete Every car WITHOUT a LapTime, If people find a Laptime they can add the car, or if they find a laptime from a car that was deleted, They can just re add the car.
This site is getting filled with cars without a single laptime, having a car database is great, N i Love cars in general, but is that what this site is? No, its for LapTimes.
You could also have the option of Not being able to add a car UNLESS it has a LapTime.
3,153 Cars, and How Many have a Single Laptime?..
That or Change the sites name..