Angular momentum proportions

Angular momentum proportions mean the total width, height and length of the car. (x , y , z)

X:
This value affects to steering and "barrel-rolling". If this value is very big, the car will roll sideways very softly, like it had some helium in it. (First picture)

Y:
This affects also to barrel-rolling, if you put a big number here.

Z:
This affects mostly to steering. And if you put too big value here, and drive down from a rooftop, the car won't lean forward when there's not anymore ground under the front wheels. (Second picture)

Here's an example:

Some values for different kinds of vehicles:

Kutter's Diablo:          0.40 , 0.22 , 0.77
Prop shafter (picture)    0.32 , 0.24 , 0.78
Pitbull's Big Dump        1.20 , 1.12 , 1.97
Limousine                 0.44 , 0.32 , 1.41
Bus                       0.60 , 0.64 , 2.60