Hello. I did not find information about this.

Outsim gives acceleration vector and rotation speed.
Does this concern the center of gravity G of the vehicle?

If yes, is it possible to know the vector from G to the driver upper body in order to transform this data given by outsim into acceleration really felt by driver?

It may be quite different...if the driver is further from G like on cars with a lot of rear mass, rotation speed adds some acceleration at the driver level.

Edit:
Noone knows about it? I suppose I was not clear.
I just want to know if acceleration data given by LFS is acceleration of car center of gravity or acceleration of driver's head or....