Hi Matt,
You are asking for LERP and SLERP.
You use LERP to make the camera drag a little behind the car, then catch-up. This helps give a feeling of acceraltion.
SLERP, this allows the car to turn, you see it turning, then the chase camera follows the turn angle.
I did a Google search "LERP" and "SLERP" and fund this article I hope this helps.
www.answers.com/topic/linear-interpolationThis should be relatively straight forward to add to your 3DGS camera code.
Good luck,
Ken