Let's get straight to business:

Number 1: @Sm10684's Mazda 787B

Notes: It's the most realistic car for very obvious reasons. Part intensive, yes, but the part count being 787 justified it all. It has the personality of a rabid dog and you can definitely get the feels from the 22B 4-rotor engine he built in the back of the machine. I redid my lap and got a 1:01 around Gold Prix. Lapped 52 times before running out of fuel, which is realistic for LeMans. Congratulations for winning!

Number 2: @asteroidbook345's Asteroid Automobiles AA-1

Notes: Nimbe, super fast, quirky, definitely not safe feeling. Lapped 47 times around Gold prix, which each lap varying from 0:58 to 0:55. The brakes were excelent, sometimes too excelent. I loved to drive it.

Number 3: @ESpanop's Neorion DVT-LM91P

Notes: It's a very consistent vehicle, very grippy, very realistic too. When driven by the AI it twitches a lot, the suspension gets pretty fragile and the brakes fade very fast. It lapped a 0:57 lap around the Gold Prix Raceway, very close to the 0:54 baseline from my (very) overengineered and (also very) overpowered car. I liked it very much. Lapped 49 times before running out of fuel.

If I forgot any submissions please state them in the comments.