Well, if you want to get an idea of crop vs full frame think of it this way. Generally speaking the crop factor is 1.6 times. So if you're shooting with the canon kit lens at 18mm that would be equivalent to a full frame camera shooting at roughly 28mm. So the full frame gets a much wider shot than the crop camera without having to have a super wide lens in terms of the mm.
I own a tamron 17-50mm 2.8 and I love it to death as far as zooms go. Sharp as a tack.
But if I were you and I'm assuming you're using the 18-55 kit lens, I'd probably be shooting it at 18mm F/5.6 and then adjust the shot accordingly by moving backwards and forwards instead of zooming. Standing closer with a wider angle will get you way better pictures for cars than zooming into the car further back.
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