[mhh__]

In games you get a better result for the cycles by cheating rather than doing a physical simulation.

Live for speed IIRC did have a fully synthesized engine sound but most games now have samples and some clever interpolation / synthesis as mentioned by others.

[ehnto]

Live For Speed also sounded pretty average, although it was still highly appreciated that they simulated it instead of fauxing give the type of game it was.