I look forward to driving cars in LFS with engines that have personality. The amount of complexity of engine modelling shown here, which I believe is possible, given the quality of the tyre model, will be great.
At the moment I find LFS's engines a bit too smooth, and linear, and generally artificial. I would imagine with the complexity of the engine sound simulation, and accurate modelling of the engine itself, we will find all sort of behaviours emerge that are hard coded in other games, like a nice burble on the over-run of cars with carbs, and if they can be bothered to model exhaust temperatures and such, backfires and other immersive behaviours, like a little black smoke from an engine that is too hot (don't drive a suzuki bandit 600 hard in a country which is at 40 degrees c! the radiator is far too small!).
I can't wait for the first race I see where the guy in first place blows a turbo flat shifting infront, causing the guy in second to spin out from all the oil deposited on the track, leaving me, tactically in third place, to take all the glory, with non of the effort.... brilliant