Just from experience and an educated guess, when you use a light that is too strong, it tends to create artifacts at the edge of the models, I guess it's the light reflecting off the ground casting something like a silver lining, but it's too strong and thin so it appears jagged.
try dimming it down to see if there's any difference.
Turning or spinning? For turning proceed as niall09 explained. For spinning you must use an image manipulation program to apply blur.
Sorry I don't understand...
You've activated ambiant occlusion. It generates lighting from sky color. It is more realistic but takes longer to render, and the Blender's renderer makes too much noise, even with the higher setting, so I replaced AO with an area light to cast global shadows and a hemi light to simulate the global illumination. I suggest you to disable the lights except the sun if you choose to use the AO, otherwise the scene will overbright.
It is already activated but with moderate settings because the LFS tyre thread textures resolution is not high enough to make sharper rendering.
hi i downloaded that program and its kwl. bt i never used blender before. i maged to get skin file loaded for he base of the car.. but how to i put the skin onto the car from ere :\ sorry for the question.
thankyou very much,
Here is my first render. i tried picking the checkered backround but it didnt work. i tried a different angle. didnt work. Black backround i didnt want im not sure how to change it. but other than that. i LOVE THE PACK Bean0! I just need to sort my nub skillz out and fix the things i want.