I've been messing around with LFS's engine sound generation system and an idea hit me that would make the current system sound much better. At the same time it would improve the simulation aspect as well.
Right now as it is the sound is too even, the engine sound doesn't vary enough. It apears as if there is absolutely no drivetrain flex or backlash at all. This is especialy noticable on the GTRs where the gear whine is loud enough.
On a straight cut gearbox like the one's used in the GTRs there would be backlash in the gears, this is imposible to avoid because of the way the gears are made. When you lift off there should be a flutter to the Gear whine during the change from acceleration to deceleration and also going the other way from deceleration to acceleraton.
http://www.youtube.com/watch?v=VHLEUijdW50
This is a good example, athough the track is a bit bumpy and adds to the effect at areas, the sound I am talking about is demonstrated perfectly around 0:55-0:59. The track is nearly smooth but the drivetrain flexes causing the car to bounce, which causes the backlash in the transmission to make a fluttering sound.
This is where LFS seems to simulate things alittle too exactly, it simulates a perfect drive train where there is no backlash or flex.
I don't know exactly what it would take to add this, but judging by the way LFSs engine sound system apears to work, adding the physics part should be all that is needed.
So what do you think?