This happened to me a couple of months ago:
I asked one of the devs about it, and here's what he said in response:
Though, I once had a situation where the game was giving me a complete different time for 2 stock B class cars on Ahtuba [R] (Sultan and Jester). The difference was like 40 seconds. Where one car would finish easily, the other one would not have a chance if there's a single mistake in the run. It's pure randomness, but it doesn't happen too often from my experience.
I asked one of the devs about it, and here's what he said in response:
Though, I once had a situation where the game was giving me a complete different time for 2 stock B class cars on Ahtuba [R] (Sultan and Jester). The difference was like 40 seconds. Where one car would finish easily, the other one would not have a chance if there's a single mistake in the run. It's pure randomness, but it doesn't happen too often from my experience.