Thank you for you answer mungewell, so it seems like I need : car->DynGC.acc.y ? I still don't really understand what the ax ay az values stand for, but it seems like they are not useful for me.
I have a second problem, I did realize that I lost a lot of my knowledge in physic and that I'm getting it back gradually. In fact, I need to know which force is felt by the driver. So I won't only need the lateral acceleration according to the car axis, I would also need the spin acceleration (and maybe velocity) of the car around the Z axis (vertical one).
Could you tell me where is these values (cause by grepping, I was only able to find the wheels' spin velocity) ?
If you have some knowledge in physic, could you confirm that my reasoning makes sense (I do not need any other value to compute the lateral acceleration felt by the driver) ?
Best,