hummm...
Ok...
I´m remaking the karts / driver...

Edited :
I noticed something in my project..
Lets say that I "forgot" what I had learned about low poly / high poly and the effects under a game use of a model..
The kart models I was using were from when I started the project, and at that time I really didnt knew how to save poly for the video mem in game. So, I went to MED and saw : "5868 faces" XD ( without tires / driver / wheel )

Well..
I remade the karts entirely, and keeped only some parts of it, the better ones.
Now they count 1142 faces, the game runs smoother, and I think they are looking much better.
I tryed to achieve a faked chrome effect, even with static images being not so convincent, in game they really shine cool. I simplified a lot its geometry, there were too many parts invisible to the player present. I also get off all the faces the player will probably never see.
This are the first med preview shots :
I tryed to give some special atention to the little kart "panel", being this the part the player will see the most part of the game :
Will continue to work now