Go pro filming.
 

I have done a couple of rc racing with a go pro hero 4 silver and they do not seem as crisp as other videos that I've seen.

What is the best format to film racing on.

Thanks in advance.

What settings are you using now?

On my bike I use 2.7k, there is a big difference in quality between good filming conditions and poor. What sort of clips are you comparing yours to? An examples we can watch?

Not put my camera on a RC car yet..

I also have the standard Hero. Again in perfect conditions, set at 1080 it does a fine job. In poor or not so good conditions its not great.