VR Karts has been updated to fix the controller issues people were experiencing. The controllers no longer need to be tracked once they're fully sync'ed up with the Vive so they're more responsive making the game play a lot better when using the Vive controllers.
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 1147766 · public branch
Steam updated · First observed