You can make a Shopify store and sell Cars Products such: polishes,anti-scratch prods, perfumes for cars, ionizeers ecc. ecc.
Or you can do some affiliate with Amazon.
But all depends on WHO are ur fans, if Car Owners you can make some good profit whit selling them products. If they're child who dream supercars it's harder, but in this scenario you can make a blog with related news and monetize with adsense.